JAW 1.041 Hardware User Manual Updated: Aug 30 2008
Contents
1. not want to over stress it Wiring Bosch LSU 4 2 sensor Fig 2 Fig 3 On the Bosch connector there are 6 terminals Fig 3 on the opposite end there are 5 wires Inside the connector there is a laser cut calibration resistor the terminal without a wire running out of it is connected to the resistor Do not cut off the connector and run the sensor directly to JAW you need the connector Inside the Plug where the metal terminals are there are the terminal s Connect the sensor to JAW following Fig 4 Fig 4 JAW Bosch LSU 4 2 Wiring JAW Screw Bosch Connector Terminal Wire Color leading to Head of Sensor Terminal 3 3 Grey 4 4 White 5 5 Yellow 6 1 Black 7 2 This is the contact that has no wire directly leading to the sensor 8 6 Red To connect to the sensor plug you can the terminal connections Fig 5 which were sent to you are part of the JAW kit See Wideband_Cable_Construction_Guide_Cheap_Method pdf Fig 5 Alternatively you can order a harness Fig 6 and use that See Wideband_Cable_Construction_Guide_Expensive_Method pdf Fig 6 Use multi stranded wires rated for atleast 3amps for connecting the sensor to JAW Wiring EGT Probe For EGT you need a k type thermocouple ideally it should be the grounded kind An example of a low cost EGT probe that is ideal for JAW is available here http www omega com pptst BTH 000_BTH 090 ht2. the LM7805 voltage regulator Fig 13 The more LED Display units you daisy chain the more limiting the heat generated from the LM7805 becomes You may put a heatsink on the LM7805 to deal with the heat if so then you will want to buy a heatsink for the T 220 IC package The metal tab of the LM7805 carries 5v so if you put a heatsink on it make sure the heatsink does not touch another voltage source 9v Battery Connector There is a 9v battery connector on JAW 1 041 it s function is to supply JAW with power for those who do not have a laptop available and want to download settings and firmware update using a desktop computer You can have a 9v battery and automotive 12v hooked up to JAW at the same time JAW will just use the automotive 12v If 9v is the only power source the wideband sensor will not function as it draws too much current everything else will function
3. use aged sensors accurately You must use Free Air air that is not contaminated with exhaust gases The best way to do this is to physically pull out the Bosch oxygen sensor from the exhaust Before Calibration make sure the sensor is warmed up and at the correct temperature When the sensor is at the correct temperature LED 1 will be off and LED2 will be on Fig 12 By clicking the Calibration button in JAW Edit JAW will perform a free air calibration and save that calibration value to its internal memory You can view the calibration value by clicking the Get CalVal button You can edit the CalVal value and overwrite the Calibration value stored on JAWs internal memory by clicking the Write CalVal button For a perfect sensor the calibration value should be very close to 0 If the value is negative that means that your sensor has the tendency to read too lean the negative calibration value is applied to each AFR Lambda sample to richen it up A positive calibration value means that the sensor tends to read to rich the positive calibration value is applied to each AFR Lambda sample to lean it out LED Display Unit Brightness On each LED Display unit is a variable resistor R2 which sets the brightness of the LED Display Turning the R2 clock wise will increase the brightness turning it counter clockwise will lower the brightness The limiting factor for how bright to set the display is the heat generated by
4. Connector on JAW Fig 9 connects to your first LED display according to Fig 10 LED Display 1 For Daisy Chaining of up to 4 Display units connect according to Fig 11 The individual wires are not shown each line between boxes represents 5 wires 5V gnd Data Clock and Enable Fig 11 Display Daisy Chain Wiring LED Display 1 LED Display 2 LED Display 4 JAW Data Data Data Data LED Data Data 1 041 In Out In Out Disp 3 In Out The Device connected nearest to JAW LED Display 1 will show AFR Lambda The second device on the chain LED Display 2 will show EGT The Third Device in the chain LED Display 3 will show positive boost pressure The forth device in the chain LED Display 4 will Show RPM Currently there is no customization of the Display order possible If you want to show RPM then you must have 4 LED Displays attached RPM will be shown on the last LED Display of the chain If you just want to show AFR Lambda all you need is one LED Display unit Sometimes the LED Display will glitch and you will get a very slow refresh To fix this problem you need to disconnect the Display unit wait a few minutes until the capacitor of the LED Display fully self discharges then reconnect the display Alternatively you can disconnect the display and short the Sv pin to the gnd pin which will ensure that the capacitor is fully discharged and then reconnect the display However do not do not short the pins while the d
5. JAW 1 041 Hardware User Manual Updated Aug 30 2008 ke Caution The Heat sink on the left hand side of JAW gets very hot Please avoid touching it JAW should be placed in an area where there is good airflow Things to do before powering up JAW Check the resistance between TP1 and TP2 underside of PCB board make sure the resistance is at least 1k Check the resistance between TP1 and TP3 underside of PCB board make sure the resistance is at least 1k Turn R_RPM the variable resistor to the most counter clockwise position The Heatsink on the Im317t carries 0 12v make sure it is does not touch another voltage source Wiring Fig 1 Wiring Summary Jaw 1 041 Connects to Notes Terminal 1 12 volt Power Should be connected to a power source that is live only when vehicle is operational or when accessories power is enabled Wire should be multi stranded and rated for at least 3 amps 2 Ground Wire should be multi stranded and rated for at least 3 amps 3 3 Bosch LSU 4 4 Bosch LSU 5 5 Bosch LSU 6 l Bosch LSU 7 2 Bosch LSU 8 6 Bosch LSU 9 Gauge voltmeter NB 0 5v analog output 10 Gauge voltmeter NB 0 5v analog output 11 RPM Pickup Connects to tach signal 12 Analog input 0 10v analog input 13 EGT ve Positive end of k type thermocouple 14 5v output You can tap this to power other 5v devices keep an eye on the temperature of the Im7805 you do
6. isplay is connected to JAW or you will damage the JAW unit and or LED Display The glitch usually occurs when a display is connected to JAW and or each other while JAW is powered up The proper way to connect the LED Display to JAW and or each other is to power off JAW first Onboard LEDs There are 3 LEDs on the JAW 1 041 unit Fig 9 LED 3 indicates power LED 1 and LED 2 indicate Wideband sensor temperature according to Fig 12 Fig 12 LEDs and Sensor Temperature Sensor Temperature LED 1 LED 2 Too cool Warming up On Off Perfect Off On To Hot On On When JAW is in firmware update mode all 3 LEDs will be on Rescuing JAW from a bad flash update If problems occur during a flash update power failure data validation failure disconnection of serial cable etc and JAW is unable to accept another firmware update you can force JAW to accept another firmware update It is recommended that you disconnect the Bosch sensor when you are doing a firmware update To force JAW into firmware update mode press button S1 Fig 7 while powering JAW up When you are in firmware update mode all 3 LEDs will be on Once in firmware update mode make sure that the next operation that you do is a firmware update via JAW Edit do not do things like query device or change settings etc Free Air Calibration Free Air Calibration uses the known oxygen content of air 20 9 to calibrate JAW so to be able to
7. ml The probe has 2 wires negative and positive usually the negative is a red wire and the positive is a yellow wire Wire the probe to JAW following Fig 6 Fig 6 JAW EGT Wiring Jaw Screw Terminal EGT Probe 2 ground Negative usually red colored 13 Positive usually yellow colored Swapping the Negative and Positive wire will not damage the probe so if you do not know which end is which you can try both ways and see which works Wiring RPM Before you hook up the rpm signal make sure R_RPM the variable resistor Fig 7 is at the most counter clockwise position possible R_RPM is a current voltage limiting variable resistor Turning the variable resistor clockwise the resistance falls Turning the resistor counter clockwise will raise the resistance R_RPM also forms a low pass filter which will smooth out any spikes on the RPM signal The higher the resistance the greater the smoothing The lower the resistance the less the smoothing Always start off with the highest resistance possible if you notice that JAW is reporting too low of an RPM then you can lower the resistance until your RPMs read correctly Ris ey _ _ clon Fig 7 Never turn the variable resistor to the most clockwise position if you do so then will damage your JAW unit For the RPM signal you can tap your tachometer or you can tap the low side of your primary ignition coil Wiring LED Display unit The Display
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