Uni-Trend UT105 multimeter
Contents
1. No Symbol Meaning Q Ohm The unit of resistance Q kQ MQ kQ kilohm 1 x 108 or 1000 ohms MO Megaohm 1 x 10 or 8 1 000 000 ohms mV V V Volts The unit of voltage mV Millivolt 1 x 10 or 0 001 volts A Amperes amps The unit of current mMA A mA Milliamp 1 x 10 or 0 001 amperes DWELL Test of Dwell RPM x10 Tach x 10 4CYL 6CYL Number of cylinders 8CYL 16 Model UT105 OPERATING MANUAL Measurement Operation 1 Part 1 Multimeter Basic Testing A AC or DC Voltage Testing see figure 3 figure 3 A warning To avoid harms to you or damages to the Meter from electric shock please do not attempt to measure voltages higher than 1000Vp although readings may be obtained The DC voltage ranges are 200 0mV 2 000V 20 00V 200 0V and 1000V The AC voltage ranges are 2 000V 20 00V 200 0V and 750V To measure DC or AC voltage connect the Meter as follows 1 Insert the red test lead into the V terminal and the black test lead into the COM terminal 2 Set the rotary switch to an appropriate measurement position in Ves or Vw 3 Connect the test leads across with the object being measured The measured value shows on the display 17 Model UT105 OPERATING MANUAL Measurement Operation 2 Note If the value of voltage to be measured is unknown use the maximum measurement position 1000V and reduce the range step by step until2. Model UT105 OPERATING MANUAL Table of Contents Title Page Overview 7 3 Unpacking Inspection 2 4 Safety Information 7 5 Rules For Safe Operation 6 Automotive Servicing Safety Guide 8 International Electrical Symbols 11 The Meter Structure 12 Rotary Switch 13 Functional Buttons a 2 14 Display Symbols z 5 2 15 Measurement Operation 17 Part 1 Multimeter Basic Testing 17 A AC and DC Voltage Testing 17 B DC Current Testing ig C Resistance Testing 20 D Diode Testing 21 E Continuity Testing 23 F Dwell Testing 24 G Engine Tach Rotation Speed Testing RPMx10 25 H Data Holding 7 26 Part 2 Diagnosis of Automotive Troubles 27 A Fuse Testing Check the fuse to see if it is blown out 27 B Switch Testing Check the switch to see if it can work correctly 27 C Solenoid or Relay Testing 28 D Starting Charging System Testing 28 E Battery Power Consumption Testing when the Engine Is off 29 F Trigger Voltage Battery Load Testing 30 G Voltage Drop Testing 31 1 Model UT105 OPERATING MA
3. figure 19 MAP Type fim Sensor To Computer The MAP sensor is used to change a pressure signal into a DC voltage or frequency one All GM Chrysler Honda and Toyota use DC voltage type MAP sensors while Ford uses frequency type MAP sensors Refer to relevant manuals for other automotive manufacturers Testing Procedure 1 Connect the DC voltage type MAP sensor in the DC voltage testing method and set the rotary switch of the meter to 20 VDC 2 Connect the frequency type MAP sensor in the RPM x10 testing method and set the meter to the number of cylinders in the automobile 45 Model UT105 OPERATING MANUAL Measurement Operation 30 3 Taking 4 cylinders 4CYL for example connect the black test lead probe of the meter to the ground terminal i e ground strap connection and connect the red one as illustrated in figure 20 4 Turn on the ignition key but do not start the engine Displayed Values DC Voltage Type Sensor Ina vacuum state the displayed value is generally between 3 V and 5 V The details shall be based on the parameters furnished by the supplier Frequency Type Sensor In a vacuum state the displayed value is generally 4770 RPM 5 This only applies to the MAP sensor produced by Ford and the other sensors shall be based on the parameters furnished by the supplier A warning The reading becomes the actual RPM only after it is multiplied by 10 Frequency RPM 30 Thi
4. 2 Temperature sensor see figure 17 The temperature sensor changes the output resistance through the changes in peripheral temperatures The hotter the sensor is the lower the resistance becomes The temperature sensor is generally used in engine braking air ventilation flow fuel temperature and other equipment figure 17 Heat D f Temperature Sensor Black Testing Procedure 1 The same as in the resistance testing method 2 When the general temperature of a heating sensor rises its resistance will drop The thermal resistance of the temperature sensor of the automotive engine is generally less than 300 Q 43 Model UT105 OPERATING MANUAL Measurement Operation 28 3 Position Sensor see figure 18 Signal Terminal Empty Foot The position sensor is an electrometer or variable resistance Itis used for the computer monitoring of the position and direction of a mechanical device The typical position sensors include throttle exhaust recirculating EGR blade air flow and other sensors Testing Procedure 1 The same as in the resistance testing method 2 Connect the red and black test lead probes respectively to the signal test terminal and ground terminal Refer to various kinds of automotive servicing manuals for its position and the resistance to be tested 44 Model UT105 OPERATING MANUAL Measurement Operation 29 4 Absolute Pressure MAP and Baro Sensor see figure 19
5. A DC Current Measurement Diode test A Continuity test Q Resistance measurement DWELL Automotive ignition dwell testing Unit degree RPM x 10 Automotive engine tach rotation speed testing Displayed Reading x 10 Unit rpm 13 Model UT105 OPERATING MANUAL Functional Buttons Below table indicated for information about the functional button operations AC voltage measurement CI Turn the power on and off HOLD Press HOLD once to enter hold mode Press HOLD again to exit hold mode and the present value is shown 1 In Hold mode Mis displayed 14 Model UT105 OPERATING MANUAL Display Symbols see figure 2 4 mUuVOkOMA pfa NI SEIE iN E CYL CL MAA aa Omo S1 0 oor Bw feo figure 2 No Symbol Meaning 1 Es The battery is low AWaming To avoid false readings which could lead to possible electric shock or personal injury replace the battery as soon as the battery indicator appears Indicator for AC voltage or current 2 AC The displayed value is the mean value 3 Indicates negative reading 4 Test of diode 5 A The continuity buzzer is on 6 Date hold is active Indicator of connecting test leads 7 A into different input terminals Terminal 15 Model UT105 OPERATING MANUAL Display Symbols 2 see figure 2
6. OPERATING MANUAL Measurement Operation 14 3 Cut off the link between the positive pole of the battery and the cable and connect the test lead probes to the circuit Connect the red test lead probe to the positive pole of the battery and the black one to the cable L warning Do not start the engine of the automobile in testing or the meter will be damaged 4 Read the reading of the tested current directly from the display with the normal current being about 100 mA For the special supply of currents when the engine is off please refer to the automotive servicing manual If there emerges any additional current do necessary servicing L warning A freguency modulated radio or clock needs a current supply of 100 mA F Trigger Voltage Battery Load Testing Upon the start of the engine test the battery to see if it can offer an adequate voltage 1 Set the rotary switch to 20 VDC 2 As prompted at the LCD connect terminal insert the red test lead into the V terminal and the black one into the COM terminal 3 Interrupt the ignition system to disable the start of the automobile Cut off the main ignition coil shunt coil cam and starting sensor so as to interrupt the ignition system Operate according to the automotive manual 30 Model UT105 OPERATING MANUAL Measurement Operation 15 4 Connect the black test lead probe to the negative pole of the battery and the red one to the positive pole o
7. temperature explosive inflammable and strong magnetic field B Replacing the Fuses see figure 21 figure 21 53 Model UT105 OPERATING MANUAL Maintenance 2 Z warning To avoid electrical shock or arc blast or personal injury or damage to the Meter use specified fuses ONLY in accordance with the following procedure To replace the Meter s fuse 1 Turn the Meter off and remove all connections from the terminals 2 Remove the holster from the Meter 3 Remove the 3 screws from the case bottom and separate the case top from the case bottom 4 Remove the fuse by gently prying one end loose then take out the fuse from its bracket 5 Install ONLY replacement fuses with the identical type and specification as follows and make sure the fuse is fixed firmly in the bracket Fuse 1 CE 315mA 250V fast type 5x20 mm Fuse 2 CE 10A 250V fast type 65x20 mm 6 Rejoin the case bottom and case top and reinstall the 3 screws and holster Replacement of the fuses is seldom required Burning of a fuse always results from improper operation C Replacing the Battery see figure 22 figure 22 54 Model UT105 OPERATING MANUAL Maintenance 3 A warning To avoid false readings which could lead to possible electric shock or personal injury replace the battery as soon as the battery indicator 4 appears To replace the Meter s battery 1 Turn the Meter power off and remove all co
8. Temperature 18 C to 28 C Relative Humidity No more than 75 RH A DC Voltage Range Resolution Accuracy Overload Protection 200mV 0 1mV 230VAC 2V imv 0 59645 20V 10mV 1000 VDC or 750 200V 100mv VAC continuous 1000V 1V 0 8 5 Remark Input impedance 10MQ B AC Voltage Range Resolution Accuracy Overload Protection 2V 1mVv 20V 10mV 0 8 5 1000 VDC or 750 200V 100mV VAC continuous 750V 1V 1 0 4 Remarks Input impedance 10MQ Frequency response 40Hz 400Hz l Displays effective value of sine wave mean value response C DC Current Range Overload Protection ICE Fuse 315mA 250V eoma oma leoors ast type 65x20mm 10A 10mA 1 2 5 CE Fuse 10A 250V fast type 65x20mm Remarks At 10A Range For continuous measurement lt 10 seconds and interval time between 2 measurement greater than 15 minutes 50 Model UT105 OPERATING MANUAL Accurate Specifications 2 D Resistance Overload Protection Range Resolution Accuracy 2002 0 12 0 8 5 1 5 5 Range Resolution Overload Protection 1mv 600Vp Remarks Open circuit voltage approximate 2 7V The silicon PN junction normal voltage is about 500 mV to 800 mV F Continuity Testing Range Resolution Overload Protection A 10 600Vp Remarks Open circuit voltage approximate 2 7V The buzzer does not s
9. be placed in the right position and no any changeover of range shall be made during measurement is conducted to prevent damage of the Meter Disconnect circuit power and discharge all high voltage capacitors before testing current resistance diodes or continuity Replace the battery as soon as the battery indicator EH appears With a low battery the Meter might produce false readings that can lead to electric shock and personal injury Model UT105 OPERATING MANUAL Rules For Safe Operation 2 When servicing the Meter use only the same model number or identical electrical specifications replacement parts The internal circuit of the Meter shall not be altered at will to avoid damage of the Meter and any accident Soft cloth and mild detergent should be used to clean the surface of the Meter when servicing No abrasive and solvent should be used to prevent the surface of the Meter from corrosion damage and accident Turn off the Meter when it is not in use and take out the battery when not using for a long time Constantly check the battery as it may leak when it has been using for some time replace the battery as soon as leaking appears A leaking battery will damage the Meter Do not use or store the Meter in an environment of high temperature humidity explosive inflammable and strong magnetic field The performance of the Meter may deteriorate after dampened The Meter is suitable for indoor use Model UT10
10. on the lamps windshield wipers fans and so on to increase the loads of the electronic systems with the voltage readings being no less than 13 0 V 6 If the readings in Steps 3 4 and 5 are normal the charging system is also normal If the readings in Steps 3 4 and 5 are beyond the limits or inconsistent with those in the operation manual check the current ranges of the conveying belt regulator AC generator connector and open circuit AC generator If any further diagnosis is reguired refer to various kinds of automotive manuals 33 Model UT105 OPERATING MANUAL Measurement Operation 18 I Ignition System Testing 1 Ignition Coil Testing 1 Before the operation cool the engine and cut off the ignition coil 2 Set the rotary switch of the meter to the 2002 As prompted at the LCD connect terminal insert the red test lead into the Q terminal and the black one into the COM terminal Test the primary coil of the ignition coil 3 Short circuit the red and black test lead probes Their short circuit resistance should be less than 0 5Q If it is more check the test lead to see if it is loose or damaged If it is damaged replace it with a new one 4 Connect the red test lead probe to the primary of the ignition coil and the black one to the primary pole of the coil see figure 10 See the detailed positions in various kinds of automotive manuals pole wn figure 10 Secondary Coil Primary C
11. probe of the meter to the signal terminal i e hot end of the sensor If the sensor has more than 3 leads what is used in the automobile is a heat oxygen sensor which has 2 hot ends Refer the positions of the hot ends in various kinds of automotive manuals At this time connect the red and black test lead probes respectively to these two hot ends Compare the readings with the specifications in the operation manual provided by the manufacturer The zirconia sensor is tested with the 2VDC As prompted at the LCD connect terminal insert the red test lead into the V terminal and insert the black test lead into the COM terminal The titania sensor is tested with the 200kQ As prompted at the LCD connect terminal insert the red test lead into the Q terminal and insert the black test lead into the COM terminal Secure the sensor with a table vice light up the propane burner and add a heat sensor terminal Make its temperature about 660 F and exhaust the oxygen from the sensor when the readings can be obtained The zirconia sensor has a voltage of 0 6 V or more The titania sensor has a resistance of about 10 Move the burner away for heating when the reading can be obtained The zirconia sensor has a voltage of 0 4 V or more The titania sensor has a resistance of about 4 kQ L warning In testing the readings will vary with the heating temperatures 42 Model UT105 OPERATING MANUAL Measurement Operation 27
12. socket because these components are provided with high voltages when the automobile is operating Model UT105 OPERATING MANUAL Automotive Servicing Safety Guide 2 To connect or cut off an electronic component close the ignition lock Pay attention to the automotive producer s cautions notes and servicing procedures All the information explanations and detailed descriptions in the operation manual have originated from the industrial information recently published It is impossible to prove the accuracy and completeness of the information of which we shall not be responsible for the assumption A The data of the automotive servicing manual have originated from the automotive servicing information 1 Contact the local distributors of automotive components 2 Contact the local retailers of automotive components 3 Contact the local libraries to look up any book for the proofreading of your automotive servicing manual so as to provide you with the latest information B Before the diagnosis of any trouble open the engine hood to make a thorough visual inspection You will find the causes for many of your problems to be solved which will save you a lot of time 1 Has the automobile recently been serviced Has the same problem sometimes occurred where the trouble lies 2 Do not try to find any short cut Check the hoses and leads where it is probably very difficult to find out where any trouble lies C
13. the test leads across with the object being measured The measured value shows on the display 20 Model UT105 OPERATING MANUAL Measurement Operation 5 Note The test leads can add 0 1Qto 0 22 of error to the resistance measurement To obtain precision readings in low resistance that is the range of 2002 short circuit the input terminals beforehand and record the reading obtained called this reading as X X is the additional resistance from the test lead Then use the eguation measured resistance value Y X precision readings of resistance When the resistance reading 20 5Qin the short circuit condition please check for loose test leads or other reasons For high resistance gt 1MQ it is normal taking several seconds to obtain a stable reading and it is better to choose shorter test lead When there is no input for example in open circuit condition the Meter displays 1 When resistance measurement has been completed disconnect the connection between the testing leads and the circuit under test D Diode Testing see figure 6 figure 6 21 Model UT105 OPERATING MANUAL Measurement Operation 6 A warning To avoid possible damage to the Meter and to the device under test disconnect circuit power and discharge all high voltage capacitors before testing diodes and continuity Never attempt an in circuit current measurement where the open circuit voltage between terminal
14. 5 OPERATING MANUAL Automotive Servicing Safety Guide 1 Warning As some automobiles are installed with safety air bags you must pay attention to the cautions in the automotive servicing manual when you are working around the components and wiring of the air bags or any carelessness will open an air bag resulting in some personal injury Note that the air bag will also be opened for a few minutes after the ignition lock is closed or even when the automotive battery is cut off which is driven by the special energy reserve Wear protective eyeglasses which meet safety requirements Operate the automobile in a well ventilated place so as to prevent the inhalation of any toxic tail gas Keep your own tools and testing instruments far from all the heater components of the operating engine Ensure that the automobile has stopped automatic transmission or put into neutral gear manual transmission and be sure that it is equipped with brakes and the wheels have been locked Do not place any tool on the automotive battery which will cause a short circuit of the electrodes and in turn lead to any personal injury or damage to a tool or battery Smoking or striking a light near the automobile is prohibited in order to prevent any combustion or explosion Do not leave the automobile in a test operation Heighten your vigilance while working around an ignition coil a shunt box an ignition lead or a spark plug
15. Free Battery Testing Before testing the starting charging system test the battery to see if it is fully charged 1 Set the rotary switch to 20 VDC 28 Model UT105 OPERATING MANUAL Measurement Operation 13 2 As prompted at the LCD connect terminal insert the red test lead into the V terminal and the black one into the COM terminal 3 Turn off the ignition switch 4 Turn on the driving lights for 10 sec to release charges from the battery 5 Connect the black test lead probe to the negative pole of the battery and the red one to the positive pole of the battery 2 The testing results are shown in contrast as follows and if the battery is less than 100 please use it after charging it 12 60 V 100 12 45 V 75 12 30 V 50 1215 V 25 E Battery Power Consumption Testing when the Engine Is off The test is carried out to find the amperage of the power consumption of the battery when both the ignition key and the engine are off The test is helpful for the determination of the additional consumption of the battery which may finally lead to the exhaustion of the battery 1 Turn off and close the ignition key and all its accessories Make sure that the bus engine louver and room lights have been turned off and closed 2 Set the rotary switch to AT10A As prompted at the LCD connect terminal insert the red test lead into the A terminal and the black one into the COM terminal 29 Model UT105
16. NUAL Title H Charging System Voltage Testing Ignition System Testing 1 2 RFONA monpa 5 Ignition Coil Testing Ignition System High Voltage Damper Testing 5 2 Hall Switch Sensor Testing Magnetic Resistance Sensor RPMx10 Testing Fuel System Testing ngine Sensor Testing Oxygen Sensor S Temperature Sensor p Position Sensor 2 5 7 Absolute Pressure MAP and Baro Sensor e Mass Air Flow MAF Sensor one General Specifications 2 5 2 Accurate Specifications TOMm0OwP DC Voltage 2 2 AC Voltage 7 2 DC Current s 2 7 Resistance B Diode 2 a Continuity Testing 5 D Dwell Testing 2 2 Tach Rotation Speed Testing Pe Maintenance A General Services B Replacing the Fuses C Replacing the Battery Page 33 34 34 35 36 37 38 39 40 41 43 44 45 47 49 50 50 50 50 51 51 51 52 52 53 53 53 54 Model UT105 OPERATING MANUAL Overview This Operating Manual covers information on safety and cautions Please read the relevant information carefully and observe all the Warnings and Notes s
17. a satisfactory reading is obtained The LCD displays 1 indicating the existing selected range is overloaded it is required to select a higher range in order to obtain a correct reading In each range the Meter has an input impedance of approx 10MQ This loading effect can cause measurement errors in high impedance circuits If the circuit impedance is less than or equal to 10kQ the error is negligible 0 1 or less When DC voltage measurement has been completed disconnect the connection between the testing leads and the circuit under test B DC Current Testing see figure 4 figure 4 Z warning Never attempt an in circuit current measurement where the open circuit voltage between terminals and ground is greater than 250V If the fuse burns out during measurement the Meter 18 Model UT105 OPERATING MANUAL Measurement Operation 3 may be damaged or the operator himself may be hurt Use proper terminals function and range for the measurement When the testing leads are connected to the current terminals do not parallel them across any circuit The measurement ranges of DC current are 200 0mA and 10 00A To measure current do the following 1 2 3 Turn off power to the circuit Discharge all high voltage capacitors Insert the red test lead into the mA or 10A terminal and the black test lead into the COM terminal Set the rotary switch to an appropriate measurement position i
18. egative pole to the ground end of the sensor by referring the details to the positions of the source and ground ends of the sensor in various kinds of automotive manuals 3 Set the rotary switch of the meter to 20022 As prompted at the LCD connect terminal insert the red test lead into the Q terminal and the black one into the COM terminal 4 Connect the red and black test lead probes in parallel to the signal connect terminal and ground end of the sensor and the Meter should display a small ohm value 5 When a metal plate blade steel tape etc is inserted into a concave magnetic pole of the sensor the display of the meter will be enlarged or overloaded if the metal plate is moved away the display will become smaller which proves that the sensor is satisfactory 4 Magnetic Resistance Sensor see figure 13 Magnetic Resistance Sensor Magnetic Resistance Distributor 37 Model UT105 OPERATING MANUAL Measurement Operation 22 The functions of a magnetic resistance sensor is similar to those of a Hall sensor and the testing methods of both sensors are also similar Their normal resistance is generally in a range of 1502 to 1 kQ Refer to the ranges of resistance in various kinds of automotive manuals for the details 5 RPMx10 Testing see figure 14 1 Set the rotary switch to RPMx10 and select the number of cylinders in the automobile to be tested 2 As prompted at the LCD connect terminal insert t
19. er it is multiplied by 10 Frequency RPM 30 This only applies to 4CYL 48 Model UT105 OPERATING MANUAL General Specifications Maximum Voltage between any Terminals and grounding Refer to different range input protection voltage A Fuse Protection of mA terminal CE Version 315mA 250V fast type 5x20mm A Fuse Protection of 10A terminal CE Version 10A 250V fast type o5x20mm Measurement Speed Updates 2 3 times second Maximum Display 11999 Temperature Operating 0 C 40 C 32 F 104 F Storage 10C 50 C 14 F 122F Relative Humidity 1 75 0 C to below 30 C lt 50 30 C to 40 C Altitude Operating 2000m Storage 10000m Battery Type One piece of 9V NEDA1604 or 6F22 or 006P Electromagnetic Compatibility In a radio field of 1 V m Overall Accuracy Specified Accuracy 5 of Range in a radio field of more than 1 V m no assigned accuracy is specified Battery Deficiency Display gq Negative reading Display mm Overloading Display 1 Eguipped with full icons display Manual ranging Polarity Automatically display Dimensions HxWxL 179 x 88 x 39mm Weight 380g including holster and battery Safety Compliances IEC61010 CAT II 1000V CAT III 600V overvoltage and double insulation standard Certification ace 49 Model UT105 OPERATING MANUAL Accurate Specifications 1 Accuracy a Reading Digits guarantee for 1 year Operating
20. f the battery 5 Start the engine continuously for 15 seconds and the testing results are shown in contrast as follows If it is within the range the starting system is normal on the contrary it is shown that there may be something wrong with the battery cable starting system cable starting solenoid or starting motor Voltage Temperature 9 6 V or more 21 1 C 70 F 9 5V 15 6 C 60 F 94V 10 0 C 50 F 9 3V 4 4 C 40 F 9 1V 1 1 C 30 F 8 9V 6 7C 20 F 8 7 V 12 2 C 10 F 8 5 V 17 8 C OF G Voltage Drop Testing Test the voltage drops caused by the switch cable solenoid or connector Any abnormal voltage drop generally results from an additional resistance The resistance will restrict the currents upon the start of the engine leading to the reduction of the load voltage of the battery and the slow down of the start of the engine 1 Cut off the ignition system so as to disable the start of the automobile Cut off the main ignition coil shunt coil cam and starting sensor so as to cut off the ignition system Operate by reference to the automotive manual 31 Model UT105 OPERATING MANUAL Measurement Operation 16 2 Set the rotary switch of the multimeter to the 200mV or 2VDC As prompted at the LCD connect terminal insert the red test lead into the V terminal and the black one into the COM terminal 3 Refer to the LOSS typical trigger voltage circuit See the details in figure 9 Test t
21. he red test lead into the 2 terminal and the black one into the COM terminal 3 Connect the black test lead probe to the ground i e ground strap connection of the automobile and the red one to the appropriate testing test terminal of the computer of the automobile if the automobile is in a DIS type Refer to the servicing handbooks of various kinds of automotive manuals for the detailed position or the negative pole of the ignition coil if the automobile is equipped with a distributor board Refer to the servicing handbooks of various kinds of automotive manuals for the detailed position 38 Model UT105 OPERATING MANUAL Measurement Operation 23 4 The normal starting rotation speed of an engine is about 50 RPM to 275 RPM Refer the detailed position to the servicing handbooks of various kinds of automotive manuals because this value relates to the current temperature engine size battery size etc warning l The displayed value of the meter becomes the actual tach reading only after it is multiplied by 10 6 Fuel System Testing It is necessary to add more accurate engine fuel control to a low injection automobile Since 1980 the automotive manufacturing industry has used electronically controlled carburetor and fuel injection so as to achieve lower fuel injection 1 GM General Motor Testing the dwell of the C 3 mixed control solenoid Place the solenoid in a cylinder monitoring the ratio betwee
22. he dwell In addition the dwell testing can also be used to test a mixed controlled solenoid e g GM feedback carburetor 1 Set the rotary switch to DWELL 2 As prompted at the LCD connect terminal insert the red test lead into the 4 terminal and the black test lead into the COM terminal Connect the ends to be tested as illustrated If the cut off switch of an ignition system is tested connect the red test lead probe to the primary negative end of the ignition coil Refer to the automotive servicing manual for the specific position 24 Model UT105 OPERATING MANUAL Measurement Operation 9 l If the GM feedback carburetor is tested connect the red probe to the ground terminal or the computer drive of the solenoid Refer to the automotive servicing manual for the specific position If the dwell of an arbitrary ON OFF equipment is tested connect the red probe to the end of the equipment fixed with an ON OFF switch Connect the black test lead probe to the good ground terminal of the automobile Read the ignition dwell of the tested automobile directly from the display G Engine Tach Rotation Speed Testing RPMx10 see figure 8 figure 8 Ignition Coil The RPM means the rotating frequency of the main shaft of the engine per minute J Set the rotary switch to RPMx10 2 As prompted at the LCD connect terminal insert the red test lead into the F2 terminal and the black
23. he voltage between any of the following pairs of points respectively 1 amp 2 2 amp 3 4 amp 5 5 amp 6 6 amp 7 7 amp 8 8 amp 9 8 amp 10 figure 9 LOSS Typical Trigger Voltage Circuit Solenoid Component Voltage Switch 300 mV Lead 200 mV Grounding 100 mV Battery Lead Connector 50 mV Wiring 0 0 V Compare the readings of the tested voltages against the said table If the voltage is on the high side check the components and connectors to see if there is anything wrong If anything wrong is found do necessary servicing 32 Model UT105 OPERATING MANUAL Measurement Operation 17 H Charging System Voltage Testing This testing is used to see if the charging system operates normally so as to provide the electronic systems with adequate power lamps electric fans radio sets etc 1 Set the rotary switch of the multimeter to the 20VDC As prompted at the LCD connect terminal insert the red test lead into the V terminal and the black one into the COM terminal 2 Connect the black test lead probe to the negative pole of the battery and the red one to the positive pole of the battery 3 Run the engine idle and close or turn off all the accessories with the normal voltage readings being 13 2 V to 15 2 v 4 Open the throttle and control the rotation speed of the engine between 1800 RPM and 2800 RPM The voltage readings should be consistent with those in 3 with the difference being no more than 0 5 V 5 Turn
24. heck any trouble with the air purifier or pipeline system 4 Check any damage to any sensor or the driving gear wo Model UT105 OPERATING MANUAL Automotive Servicing Safety Guide 3 5 Check the ignition lead any breakage of any terminal crack on any spark plug or breakage at the insulation of the ignition lead Check all the vacuum hoses any right line shrinkage bend crack fracture or damage Check the leads any connection of sharp edges connection of hot surfaces such as exhaust manifold shrinkage burn or scratch at the insulation or right line connection Check circuit connections any pin corrosion bend or damage inappropriate connection position or damaged electrode lead 10 Model UT105 OPERATING MANUAL International Electrical Symbols AC Alternating Current Grounding Double Insulated Deficiency of Built In Battery Fuse Warning Refer to the Operating Manual Conforms to Standards of European Union 11 Model UT105 OPERATING MANUAL The Meter Structure see figure 1 figure 1 LCD display Data Hold button Rotary Switch Input Terminals a fF oO N Power button 12 Model UT105 OPERATING MANUAL Rotary Switch Below table indicated for information about the rotary switch positions gor Function Position V DC voltage measurement V _ AC voltage measurement
25. l be unlocked immediately and the meter randomly shows the current testing result 26 Model UT105 OPERATING MANUAL Measurement Operation 11 Part2 Diagnosis of Automotive Troubles The digital multimeter is a tool for the very effective diagnosis of the troubles with the electronic systems of the automobile This part gives a special introduction as to how the multimeter is used to diagnose any trouble with a fuse switch solenoid relay starting and charging systems ignition system fuel system and engine sensor A Fuse Testing Check the fuse to see if it is blown out 1 Set the rotary switch to 2002 2 As prompted at the LCD connect terminal insert the red test lead into theQterminal and the black one into the COM terminal 3 Short circuit the red and black test lead probes when the reading of the meter should be displayed between 0 2Qand 0 52 If it is more than 0 50 check the test leads to see whether they are well connected 4 Connect the red and black test lead probes in parallel to the two ends of the fuse when the reading of the meter should be displayed less than 102 indicating that the fuse is good When the display is overload 1 it is shown that the fuse has been blown out It must be replaced with a fuse of the same type and size B Switch Testing Check the switch to see if it can work correctly 1 The same as in Items 1 to 3 Fuse Testing 2 Connect the black test lead probe to o
26. n Az Break the current path to be tested Connect the red test lead to the more positive side of the break and the black test lead to the more negative side of the break Turn on power to the circuit The measured value shows on the display Note If the value of current to be measured is unknown use the maximum measurement position 10A and 10A terminal and reduce the range step by step until a satisfactory reading is obtained When DC current measurement has been completed disconnect the connection between the testing leads and the circuit under test At 10A Range for continuous measurement lt 10 seconds and interval time between 2 measurements greater than 15 minutes Model UT105 OPERATING MANUAL Measurement Operation 4 C Resistance Testing see figure 5 figure 5 L warning To avoid damages to the Meter or to the devices under test disconnect circuit power and discharge all the high voltage capacitors before measuring resistance Never attempt an in circuit current measurement where the open circuit voltage between terminals and ground is greater than 60V DC or 30V AC rms The resistance ranges are 200 09 2 000kQ 20 00kQ 200 0kQ 2 000MQand 20 00MQ To measure resistance connect the Meter as follows 1 Insert the red test lead into the Q terminal and the black test lead into the COM terminal 2 Set the rotary switch to an appropriate measurement position in Q range 3 Connect
27. n the air and the fuel which should generally be 14 7 to 1 between the air and the fuel so as to reduce the injection of surplus fuel The testing is used to see if the solenoid is installed right in the position and the dwell of the meter can also indirectly used for the testing A Start the engine of the automobile to achieve a rotation speed of 3000 RPM So far as a GM automobile is concerned set the rotary switch to the DWELL and select 6CYL B When the automobile is operating in a short fuel state or in a long fuel state the dwell of the meter should be displayed between 10 and 50 39 Model UT105 OPERATING MANUAL Measurement Operation 24 2 Fuel Injector Resistance Testing see figure 15 figure 15 Fuel Injector The testing method is similar to that of the resistance of an ignition coil A Cut the electric link off the injector Refer to the servicing handbooks of various kinds of automotive manuals for the detailed position B Connect the red and black test lead probes to the two ends of the injector The general normal resistance is less than or equal to 10Q J Engine Sensor Testing see figure 16 Ground If the sensor has a 1 or 3 lead outlet met the ground terminal is its shell If the sensor has a 2 or 4 lead outlet the ground terminal is its special wiring Black 40 Model UT105 OPERATING MANUAL Measurement Operation 25 To be adapted to the provisio
28. ne end of the switch and the red one to another end When the switch is connected the reading of the meter should be displayed less than 10Q When the switch is cut off overload 1 should be displayed as the reading of the meter 27 Model UT105 OPERATING MANUAL Measurement Operation 12 C Solenoid or Relay Testing 1 The same as in Items 1 to 3 Fuse Testing 2 Connect the red and black test lead probes in parallel to the two end of a solenoid or relay The impedance of most of solenoids or relay coils is less than 200Q See the details in the automotive manual AX warning Both ends of a general solenoid or relay are connected with diodes Check to see if there is any damaged coil Even if the coil is found satisfactory the solenoid or relay may still be damaged The relay may be welded or worn due to the frequent sparking of the contacts The solenoid may be stuck when the coil is in an on position Therefore some potential problems cannot be found in testing D Starting Charging System Testing The on off package of the engine starting system consists of a battery engine starting button solenoid and relay starting buttons lead connections and lines During the operation of the engine the charging system keeps the battery charged This system consists of an AC generator voltage calibrator lead connections and circuits The multimeter is an effective tool for the checking of these systems 1 Load
29. nnections from the terminals 2 Take the Meter out from the holster 3 Remove the 3 screws from the case bottom and separate the case top from the case bottom 4 Remove the battery from the battery connector 5 Replace with a new 9V battery NEDA1604 6F22 or 006P 6 Rejoin the case bottom and case top and reinstall the 3 screws and the holster END This operating manual is subject to change without notice 55 Model UT105 OPERATING MANUAL Copyright 2001 Uni Trend International Limited All rights reserved Manufacturer UNI TREND TECHNOLOGY DONG GUAN LIMITED Address Dong Fang Da Dao Bei Shan Dong Fang Industrial Development District Hu Men Town Dong Guan City Guang Dong Province China Headquarters Uni Trend International Limited Address Rm901 9 F Nanyang Plaza 57 Hung To Road Kwun Tong Kowloon Hong Kong Tel 852 2950 9168 Fax 852 2950 9303 Email info uni trend com http www uni trend com 56
30. ns for low injection and fuel saving in the early period of the eighties the computer controlled regulators were installed in the automobile and the sensors provided the computer with some data reguired The multimeter is an effective tool for the detection of the operation of a sensor 1 Oxygen Sensor The oxygen sensor is used to test the oxygen content in the exhaust giving rise to an appropriate voltage or resistance A low voltage high resistance means a too high oxygen content in the exhaust while a high voltage low resistance means a too low oxygen content The computer regulates the ratio between the air and the fuel according to the high or low voltage There are normally two types of oxygen sensors the zirconia and titania sensors Refer to the different external properties of the two types for the details Testing Procedure 1 Move the oxygen sensor out of the automobile 2 Set the rotary switch to 200 Q As prompted at the LCD connect terminal insert the red test lead into the Q terminal and the black one into the COM terminal 3 Connect the black test lead probe of the meter to the ground terminal i e cold end of the sensor Z warning If the sensor has a 1 or 3 lead outlet the ground terminal is its shell If the sensor has a 2 or 4 lead outlet the ground terminal is its special wiring 41 Model UT105 OPERATING MANUAL Measurement Operation 26 4 Connect the red test lead
31. oil Cylindrical Ignition Coil AX warning The reading of the testing becomes the actual tested resistance only after the reduction of the short circuit values of the test leads The primary resistance is generally between 0 30 and 2 00 34 Model UT105 OPERATING MANUAL Measurement Operation 19 5 Set the rotary switch to the 200kQ and test the secondary coil of the ignition coil 6 Connect the red test lead probe to the secondary outlet and the black one to the primary pole Refer to various kinds of automotive manuals for the details 7 The secondary resistance is generally in a range of 6 kQ to 30 kQ Refer to various kinds of automotive manuals for the details 8 For a heater ignition coil repeat the said testing steps Note For a heater ignition coil the resistance may be a little higher because the resistance of a coil will vary with the temperatures The higher the temperature the higher the resistance will be and vice versa 2 Ignition System High Voltage Damper Testing see figure 11 figure 11 Spark Plug 1 Move the connectors of the ignition system from the engine Refer to the ignition system movement procedure in various kinds of automotive manuals for the details 35 Model UT105 OPERATING MANUAL Measurement Operation 20 A warning Some of Chrysler s products use a spark plug high voltage damper with positive lock end electrodes which can
32. one into the COM terminal Select an appropriate number of cylinders Connect the ends to be tested as illustrated 25 Model UT105 OPERATING MANUAL Measurement Operation 10 If a DIS ignition system without any distributor board is used in the automobile connect the red test lead probe to the TACH tachometer signal line which is connected to the computer DIS module of the automotive engine Refer to the automotive servicing manual for the specific position If an ignition system with a distributor board is used in the automobile connect the red test lead probe to the primary negative end of the ignition coil Refer to the automotive servicing manual for the specific position Connect the black test lead probe to the good ground terminal of the automobile Upon the start of the engine or during its operation test the rotation speed of the engine and read the displayed value from the display The actual rotation speed of the automobile to be tested should be equal to the displayed value multiplied by 10 For example the actual rotation speed of the engine of the automobile should be 2000 RPM 200 x 10 if the displayed value is 200 and the meter is set at the 6CYL 6 cylinders notch H Data Holding Under any testing circumstances the display of the meter holds the testing result as soon as the HOLD is pressed down When the HOLD is pressed once more the testing result held in the display of the meter wil
33. only be moved out of the distributor board If it is moved out of anywhere else some damage will result Refer to various kinds of automotive manuals for the details 2 Set the rotary switch of the meter to the 200 kQ As prompted at the LCD connect terminal insert the red test lead into the Q terminal and the black one into the COM terminal 3 Connect the red and black test lead probes in parallel to the two ends of the high voltage damper and observe the reading The normal resistance is generally ina range of 3 kQ to 50 kQ In bending the lead the reading should remain unchanged 3 Hall Switch Sensor Testing see figure 12 Chrysler Motor Fuel Dispenser Hall Switch Ground Signal Terminal Iron Plate Ford Motor Fuel Dispenser Aa ae Li Magnetic Pl Red Signal Terminal Hall Sensor Signal Terminal Ground figure 12 When the tach and dwell are tested in the computer of the automobile a Hall sensor is used The Hall sensor is normally used in the ignition system to detect the position of the camshaft so that the computer of the automobile can set the optimal time for the ignition and the opening of the fuel injector 36 Model UT105 OPERATING MANUAL Measurement Operation 21 1 Move the Hall sensor out of the automobile and see the details of the operation in various kinds of automotive manuals 2 Connect the positive pole of the 9 V battery to the source end of the sensor and the n
34. ound when the resistance value is gt 50Q The circuit is disconnected The buzzer sounds continuously when the resistance value is 30Q The circuit is in good condition 51 Model UT105 OPERATING MANUAL Accurate Specifications 3 G Dwell Testing La La 3 5 600 Vp 8CYL Remark Input Amplitude More than or equal to 10 V in direct impulse more than or equal to 0 5 mS in width H Tach Rotation Speed Testing Ovetaed rte 3 5 Remarks Input Amplitude More than or equal to 10 V in direct impulse more than or equal to 0 5 mS in width Maximum Tach 10000 RPM Tach Displayed Reading x 10 52 Model UT105 OPERATING MANUAL Maintenance 1 This section provides basic maintenance information including battery and fuse replacement instruction Z warning Do not attempt to repair or service your Meter unless you are qualified to do so and have the relevant calibration performance test and service information To avoid electrical shock or damage to the Meter do not get water inside the case A General Service l Periodically wipe the case with a damp cloth and mild detergent Do not use abrasives or solvents To clean the terminals with cotton bar with detergent as dirt or moisture in the terminals can affect readings Turn the Meter off when it is not in use and take out the battery when not using for a long time Do not store the Meter in a place of humidity high
35. ransient overvoltages than CAT III CAT III Distribution level fixed installation with smaller transient overvoltages than CAT IV Use the Meter only as specified in this operating manual otherwise the protection provided by the Meter may be impaired International electrical symbols used on the Meter and in this Operating Manual are explained on page 11 Model UT105 OPERATING MANUAL Rules For Safe Operation 1 Awarning To avoid possible electric shock or personal injury and to avoid possible damage to the Meter or to the eguipment under test adhere to the following rules Before using the Meter inspect the case Do not use the Meter if it is damaged or the case or part of the case is removed Look for cracks or missing plastic Pay attention to the insulation around the connectors Inspect the test leads for damaged insulation or exposed metal Check the test leads for continuity Replace damaged test leads with identical model number or electrical specifications before using the Meter When using the test leads keep your fingers behind the finger guards Do not apply more than the rated voltage as marked on the Meter between the terminals or between any terminal and grounding When the Meter working at an effective voltage over 60V in DC or 30V in AC special care should be taken for there is danger of electric shock Use the proper terminals function and range for your measurements The rotary switch should
36. s and ground is greater than 60V DC or 30V AC rms Use the diode test to check diodes transistors and other semiconductor devices The diode test sends a current through the semiconductor junction then measures the voltage drop across the junction A good silicon junction drops between 0 5V and 0 8V To test a diode out of a circuit connect the Meter as follows 1 Insert the red test lead into the terminal and the black test lead into the COM terminal 2 Set the rotary switch toe 4 3 For forward voltage drop readings on any semiconductor component place the red test lead on the component s anode and place the black test lead on the component s cathode The measured value shows on the display Note Ina circuit a good diode should still produce a forward voltage drop reading of 0 5V to 0 8V however the reverse voltage drop reading can vary depending on the resistance of other pathways between the probe tips Connect the test leads to the proper terminals as said above to avoid error display The open circuit voltage is around 2 7V when testing diode 22 Model UT105 OPERATING MANUAL Measurement Operation 7 The LCD will display 1 indicating open circuit for wrong connection The unit of diode is Volt V displaying the positive connection voltage drop value When diode testing has been completed disconnect the connection between the testing leads and the circuit under test E Contin
37. s only applies to 4CYL 46 Model UT105 OPERATING MANUAL Measurement Operation 31 5 Mass Air Flow MAF Sensor see figure 20 figure 20 Ground Low freguency MAF Sensor of GM General Motor in 1988 or Before The sensor converts the air flow into a DC voltage low frequency or high frequency signal UT105 can only be used to test a DC voltage or low frequency signal Testing Procedure 1 Connect the DC voltage type MAF sensor in the DC voltage testing method and set the rotary switch of the meter to 20VDC Connect the frequency type MAF sensor in the RPMx10 testing method and set the meter to the number of cylinders in the automobile Now take 4 cylinders 4CYL for example 2 Connect the black test lead probe of the meter to the ground terminal i e ground strap connection and connect the red one as illustrated in figure 21 3 Turn on the ignition key but do not start the engine 47 Model UT105 OPERATING MANUAL Measurement Operation 32 Displayed Values DC Voltage Type Sensor The displayed value should be less than or egual to 1V The details shall be based on the parameters furnished by the supplier Freguency Type Sensor Ina vacuum state the displayed value should be 330 RPM 5 This only applies to GM low frequency sensors The other low frequency sensors shall be based on the parameters furnished by the supplier A warning The reading becomes the actual RPM only aft
38. trictly waring To avoid electric shock or personal injury read the Safety Information and Rules for Safe Operation carefully before using the Meter In 1999 counts and 3 1 2 digits the UT105 Meter is a manual testing automotive digital Multimeter Spotting a unique design with an extra large screen this meter has useful features such as a fully functional symbol display connect prompt and full testing overload protection For this reason it emerges as an electric Meter with more outstanding performance for safer operation than other Meters In addition to the automotive dwell and tach rotation speed this Meter can be used to test the AC voltage DC voltage DC current resistance diode and continuity Model UT105 OPERATING MANUAL Unpacking Inspection Open the package case and take out the Meter Check the following items carefully to see any missing or damaged part Item Description Qty 1 English Operating Manual 1 piece 2 Test Lead 1 pair 3 Alligator Clip 1 pair 4 9V Battery NEDA 1604 6F22 or 006P 1 piece In the event you find any missing or damage please contact your dealer immediately Model UT105 OPERATING MANUAL Safety Information This Meter complies with standards IEC61010 in pollution degree 2 overvoltage category CAT II 1000V CAT III 600V and double insulation CAT II Local level appliance PORTABLE EQUIPMENT etc with smaller t
39. uity Testing see figure 6 A warning To avoid possible damage to the Meter and to the device under test disconnect circuit power and discharge all high voltage capacitors before testing diodes and continuity Never attempt an in circuit current measurement where the open circuit voltage between terminals and ground is greater than 60V DC or 30V AC rms To test for continuity connect the Meter as below 1 Insert the red test lead into the terminal and the black test lead into the COM terminal 2 Set the rotary switch to gt A 3 Connect the test leads across with the object being measured The buzzer does not sound when the resistance value is gt 50 The circuit is disconnected The buzzer sounds continuously when the resistance value is lt 30Q The circuit is in good condition Note The LCD displays 1 indicating the circuit being tested is open Open circuit voltage is approx 2 7V When continuity testing has been completed disconnect the connection between the testing leads and the circuit under test 23 Model UT105 OPERATING MANUAL Measurement Operation 8 F Dwell Testing see figure 7 figure 7 Ignition Coil It was very important in the past to test the dwell of the cut off switch of an ignition system The dwell testing means the duration when the cut off switch remains off when the cam is turning Now as an automobile is ignited electronically it is no longer necessary to adjust t
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