Service Manual Repairs $533555"
Contents
1. Connect test lamp Connect across battery plus terminal and terminal on micro switch with yellow wire connected Start engine Should be at normal operating temperature 130861 AS Test light OUT Test light MUST NOT illuminate at idle speed If test light illuminates adjust micro switch position Slacken micro switch retaining screws Move micro switch DOWN until test light goes out Tighten retaining SCrews This is a temporary adjustment Final adjustment will follow later on 130862 A6 Idle speed Idle speed should be 850 rpm 850 900 rpm permitted If outside these limits idle speed should be adjusted See operations A7 A9 If inside continue to A10 130882 15 Group 25 Intake exhaust emission systems Basic setting B21F 1981 Adjusting idle speed RSS EE han Ao a TE Ta Tan A7 Idle speed NOT 850 rpm 850 900 rpm permitted Use throttle position adjustment screw to adjust idle speed to 850 rpm 850 900 rpm permitted NOTE Test light MUST NOT illuminate If necessary readjust micro switch position A8 Activate Electronic Control Unit Reconnect white red wire in terminal 12 of blue connector plug at Electronic Control Unit 133381 A9 idle speed change After activating Electronic Control Unit idle speed should change to 900 rpm 850 950 rpm permitted Stop engine 133389 16 Group 25 Intake exhaust emission sys2. B21F Turbo inc intercooled BABE or Steg ai an Specifications Basic setting Electronic Control Unit de activated rpm ama s n 850 700 EE 700 sn b E H lovver upper limit 800 850 700 750 850 900 850 900 700 750 700 750 850 900 850 900 On B21F Cl and B21F LH Jetronic with idle speed 750 rpm idle speed increases to 900 rpm when AC is switched on Component identification numbers 1981 models B21F California Engine identification numbers 498892 and 498893 B21F MPG Engine identification numbers 498896 and 498897 B21F Turbo Engine identification number 498898 manual trans only B28F California Engine identification numbers 498638 and 498639 1982 models B21F Cl Engine identification numbers 498960 and 498961 B21F LH Jetronic Engine identification numbers 498962 and 498963 B21F Turbo Engine identification numbers 498966 and 498967 B28F Engine identification number 498667 auto trans only 1983 1984 models B21F Turbo Engine identification numbers 499800 and 499801 1983 499868 and 499869 1984 B21F Turbo Intercooler Engine identification numbers 499926 and 499927 Volvo P N Bosch No Color point Volvo P N Bosch No Color point Volvo P N Bosch No Color point Volvo P N Bosch No Color point Volvo P N Bosch No Color point Volvo P N Bosch No Color point Volvo P N Bosch No Color point Volvo P N Bosch No Color point Volvo P N Bosch N
3. Stop engine MIL eae 130877 B12 Reconnect throttle control rod at lever Cable pulley should be completely retracted If adjustments of engine controls must be made follow operations B11 B13 below 22 Group 25 Intake exhaust emission systems Basic setting B21F MPG 1981 B21F CI 1982 Adjusting controls Wage sarawa eer ama ara B13 Fi ee ng l i Si mn SS _ Adjust control rod length Disconnect throttle cable and automatic transmission Mee cl kickdown cable s Adjust control rod length as necessary 130878 B14 Attach and adjust throttle cable 133387 B15 Automatic transmission kickdown cable Check cable length at closed and open throttle engine off Open throttle measurement should be checked with throttle pedal in car depressed NOT by actuating linkage by hand Cable should be pulled out 50 mm 1 968 130880 23 Group 25 Intake exhaust emission systems Basic setting B21F MPG 1981 B21F CI 1982 Adjusting microsvvitch B16 Engine NOT running throttle CLOSED Slacken micro switch retaining screws Move micro switch UP until test light illuminates b d i f t Zeg A mmm _ e ag Micro switch UP 130881 B17 Set micro switch position Move micro switch DOWN 2 2 5 mm 0 08 0 10 Test light MUST NOT illuminate Tighten screws Remove test lamp install
4. Ell j blue yellow 18 1 sl s e 4 wWhite red or gray mm 133452 Group 25 Intake exhaust emission systems Wiring diagrams i X GI 3lb 31 87 V OXYGEN SENSOR SYSTEM Group 25 Intake exhaust emission systems Wiring diagrams to White ned for gray Idle speed Ground circuit through throttle switch C is interrupted The Electronic Control Unit A ECU controls air con trol valve H to set correct idle speed white red or gra EH ED EV m control test point CIS System B28F Fuse No 13 Instruments Turn signals Seat belt warning CIS System Legend A ECU Electronic Control Unit B Seat belt reminder unit C Throttle switch D Ignition switch de E Fuel pump relay F Fuse box G Control test point H Air control valve Coolant temperature sensor J Ignition coil K Ballast resistor General Coolant temperature sensor I con tinuously sends a signal to the ECU so it can set an idle speed that corres ponds to the coolant temperature G is designated control test point It is a connection that for convenience is used on the production line Above idle speed Ground circuit through throttle switch C is closed ECU H controls air control valve H to set high air flow to avoid engine stalls Lt med T AKS gt p KS H bIue yellou 1 blue 18 C BET steel for gra
5. blue connector and ground Test lamp ignition ON Connect leads to terminal 8 blue connector and terminal 1 black connector 133363 Throttle pedal NOT depressed idle position 1981 models B21F all infinite resistance test lamp NOT illuminated B28F zero resistance test lamp illuminated g 1982 models B21F all infinite resistance test lamp NOT illuminated B28F infinite resistance test lamp NOT illuminated Throttle pedal depressed above idle position 1981 models B21F all zero resistance test lamp illuminated B28F infinite resistance test lamp NOT illuminated j 1982 models B21F all zero resistance test lamp illuminated B28F zero resistance test lamp illuminated Incorrect readings adjust according to instructions in this manual 133364 Check coolant temperature sensor Use ohmmeter to test coolant tempera ture sensor resistance Connnect across terminals 9 and 11 See graphs in Specifications section showing relations resistance tempera ture Group 25 Intake exhaust emission systems Fault tracing 8 Check signal from ignition system Connect tachometer across terminal 12 and ground Start engine Tachometer should show engine speed Incorrect or no reading Check connectors on firewall see first operation of these fault tracing procedures GROUND 133365 Check air control valve Prepare and connect jumper wire across terminals 4 and 1 Connect anot
6. 3 Attach and adjust throttle cable E14 Automatic transmission adjust kickdown cable Check cable length at closed and open throttle engine off Open throttle measurement should be checked with throttle pedal in car depressed NOT by actuating linkage by hand Cable movement should be 50 mm 1 968 Closed throttle L 1mm Open throttle L 51 mm pn eee Adjusting micro switch E15 FEELER GAUGE THROTTLE POSITION ADJUSTMENT SCREW Install feeler gauge Use feeler gauge 0 3 mm 0 12 Insert between throttle position adjustment screw and stop Illustration shows 1981 switch arrangement 1982 model switch looks slightly different 130309 37 Group 25 Intake exhaust emission systems Basic setting B28F 1981 1982 E16 Adjust 1981 turn adjustment screw until test light goes out 1982 turn adjustment screw until test light illuminates 130910 NOTE B28F is equipped with two micro switches actuated by throttle control The second micro switch closes a Lambda sond circuit at full throttle to provide richer air fuel mixture at maximum acceleration NOTE Vehicles modified for high altitude have this micro switch disconnected 130911 E17 Adjusting full throttle enrichment switch Loosen retaining screws for micro switch Turn micro switch sideways Test light should come on go out 2 5 mm 3 32 before pulley touches full throttle stop Tighten retai
7. 73 20 Group 25 Intake exhaust emission systems Basic setting B21F MPG 1981 B21F CI 1982 B7 Test light OUT Test light MUST NOT illuminate at idle speed K E TT na manara A If test light illuminates adjust micro switch position Slacken micro switch retaining screws Move micro switch DOWN until test light goes out Tighten retaining SCrews This is a temporary adjustment Final adjustment will follow later on 130874 B8 Idle speed Idle speed should be 700 rpm 700 750 rpm permitted If outside these limits idle speed should be adjusted See operations B9 B11 Inside limits proceed to op B12 133388 Adjusting idle speed Gen B9 Idle speed NOT 700 rpm 700 750 rpm permitted NOTE Test light MUST NOT illuminate If necessary readjust micro switch position 130875 21 Group 25 Intake exhaust emission systems Basic setting B21F MPG 1981 B21F CI 1982 BZIF MPG 1981 B21F CI 1982 GROUND SS 133391 B10 Activate Electronic Control Unit B21F MPG 1981 Reconnect vvhite red vvire in terminal 12 of blue connec tor plug at Electronic Control Unit B21 Cl 1982 Disconnect ground wire at terminal 10 of blue connector plug at Electronic Control Unit 130876 B11 Idle speed change After activating Electronic Control Unit idle speed should change to 750 rpm 700 800 rpm permitted for 1981 730 770 for 1982
8. 981 Reconnect white red wire in terminal 12 of blue connec tor at Electronic Control Unit B21F5 Turbo 1982 B21F Turbo Intercooler 1984 Disconnect test point from ground 133392 C12 idle speed change After activating Electronic Control Unit idle speed should change to 1931 uses 900 50 rpm 1982 nice 900 20 rpm Stop engine install panel etc 130885 C13 Reconnect throttle control rod at lever Cable pulley should be completely retracted Disconnect throttle cable automatic transmission also kickdown cable Adjust control rod length as necessary Basic setting B21F Turbo 1981 1984 B21F Turbo In tercooler 1964 C14 Attach and adjust throttle cable 130895 C15 CABLE LENGTH BEING PULLED OUT Automatic transmission adjust kickdown cable Check cable length at closed and open throttle Open throttle measurement should be checked with throttle pedal in car depressed NOT by actuating linkage by hand Cable should be pulled out 50 mm 2 130869 E Adjusting throttle switch C16 Insert feeler gauge Insert 0 3 mm 0 01 in feeler gauge between throttle ad justment screw and throttle control lever IFEELER GAUGE 130896 29 Group 25 Intake exhaust emission systems Basic setting B21F Turbo 1981 1984 B21F Turbo Intercooler 1984 130898 CT7 Switch UP Move switch UP until test light illuminat
9. 982 o D1 D6 31 B28F 1981 1982 m m n ts Mic ea E1 E18 33 Wiring Diagrams s n 88 1 40 B21F LH Jetronic 42 B21F Turbo 2214140404222 dores trada esse ar 44 SRO E ge a E E CIEE ee e 46 I Indicates changes in text and or specifications in this manual TP 30363 2 6000 10 84 Printed in U S A 1984 VOLVO OF AMERICA CORPORATION We reserve the right to make alterations Group 25 Intake exhaust emission systems CIS system description Constant Idle Speed System CIS System The system is comprised of the following main The Electronic Control Unit processes information on components engine temperature engine speed and throttle position Electronic Control Unit It controls engine at idle or near idle by regulating the Air Control Valve Air Control Valve Throttle switch Coolant temperature sensor Distributor via ignition coil ELECTRONIC CONTROL UNIT Ja THROTTLE HP SWITCH INTAKE MANIFOLD IGN SWITCH ra A GE EE I 4 GROUND TERMINAL 1 Gen EH IGNITION COIL SENSOR 130545 Air flow modes New features introduced on 1982 models AL Jaba in 1981 the system had three basic air Regulated flow with A C on B21F CI and B21F LH low modes When the air conditioning is switched on a second Low flow deceleration regulated
10. B28F 1981 1982 Basic setting of Constant Idle Speed System B28F 1981 Engine Identification Number EIN 498638 manual transmission 498639 automatic transmission B28F 1982 Engine Identification Number EIN 498667 automatic transmission only El Disconnect throttle control rod At cable pulley E2 Check cable assembly Make sure cable and pulley run smoothly and do not bind in any position 130901 E3 Check throttle Make sure throttle shaft and throttle plate do not bind in any position 130902 33 Group 25 Intake exhaust emission systems Basic setting B28F 1981 1982 E4 idle speed adjustment screw Make sure it is screwed to bottom NOTE This screw is used to adjust idle speed on engines without CIS System 130903 Remove panel in front of right front door Electronic Control Unit for Constant Idle Speed System is located below Electronic Control Unit for Lamda sond system 133310 _ _ E6 B28F 1981 B28F 1981 De activate Electronic Control Unit Disconnect white red wire at terminal 12 of blue connec tor plug at Electronic Control Unit NOTE Same wire ends at ignition coil but cannot be discon nected there 133393 34 Group 25 Intake exhaust emission systems Basic setting B28F 1981 1982 ES B28F 1982 De activate Electronic Control Unit Ground terminal 10 connector in place Best vvay is to insert a copper vvire along terminal vvire E8 Connect te
11. DES SE WE B21F all 1981 Du SC EEE BABE si Guia er 1981 and 1982 ahi Suggested test values IN 10 C 14 F 32000 53000 ohms Ta _ 20 C 68 F 8500 11500 ohms 8000 I 80 C 176 770 1320 ohms 6000 4000 m DEN i SEN 1000 BOO 600 400 133374 ohms Volvo P N 1306937_2 Bosch O 280 130 053 10000 6000 Volvo P N 1306937 2 Saad Bosch No 0 280 130 023 E B21F B21FT all 1982 2000 1000 nn Suggested test values 10 C 14 F 7000 11600 ohms 20 C 68 F 2100 2900 ohms vi 80 C 176 F 270 390 ohms 80 100 C 140 176 212 F 133373 Group 25 Intake exhaust emission systems Fault tracing Faults in CIS system It is advisable to eliminate other systems as fault source The reference list below may be helpful in finding prior to fault tracing the CIS system possible reasons for an incorrect idle speed Simple reference list of symptoms and possible reasons Symptom Possible reasons Idle varies up and down CO adjustment incorrect more than 50 rpm for 1981 models Ignition timing incorrect more than 20 rpm for 1982 models Throttle butterfly valve incorrectly adjusted Electronic Control Unit faulty Air control valve faulty Air leakage Idle speed too high Low basic idle speed Air control valve sticks Throttle switc
12. Service Manual Repairs and maintenance VOLVO Contents Operation Page Introduction do c pase 02222206222 a ar rn er 1 System description BAN aee 2 Specifications ss en ae 4 Fault tracing CIS system_ 6 Basic setting of Constant Idle Speed system SEI AGEL RE Dons ous bes A1 A15 14 B21F MPG 1981 B21F Cl 1982 B1 B17 19 B21F Turbo 1981 ia a dames is ca is dei pe a C1 C18 25 B21F LH Jetronic 1982 EECH D1 D6 31 B28F 1981 1982 San Eta tated ha sa sha de 4 E1 E18 33 Wiring Diagrams B21F typical REI a EEN 40 B21F LH Jetronic 6x6 ana ANE Ed gier Ar aen 42 EES EO eo Se EO PCI EE CE CASE ERR 44 B28F eines SE Eu CED ee nee ee 46 Indicates changes in text and or specifications in this manual TP 30363 2 6000 10 84 Printed in U S A 1984 VOLVO OF AMERICA CORPORATION We reserve the right to make alterations Contents Operation Page Introduction 4 1 System description 2 Specifications _ 4 Fault tracing CIS system 6 Basic setting of Constant Idle Speed system SS MAY 202221 c2 ae daca are A1 A15 14 B21F MPG 1981 B21F CI 1982 eh i B1 B17 19 B21F Turbo 1981 een it esa ELS at arch eo wie Sucre ce C1 C18 25 B21F LH Jetronic 1
13. Unit when the throttle goes to idle position This occurs during idle and deceleration For B28F 1981 it is closed at idle for all others 1981 and 1982 interrupted at idle Group 25 Intake exhaust emission systems CIS system description Additional features introduced on 1982 models B21F Cl B21F LH Jetronic Electronic Control Unit for CIS Constant Idle Speed system The Electronic Control Unit automatically increases engine rpm when the air conditioning is operating The Electronic Control Unit has two extra terminals 7 and 10 For basic idle mode terminal 10 is grounded When air conditioning is switched on a micro switch in the air conditioning control energizes terminal 7 This will change the operating mode of the Electronic Con trol Unit and set a higher idle rpm This provides im proved air conditioning operation and also improved cooling due to faster running coolant pump and fan 133266 B28F Throttle Switch New throttle switch same as on 4 cyl Infinite resistance in idle position Electronic Control Unit New control unit with test terminal for basic idle mode Reversed input from the throttle switch as compared with previous unit Modification introduced on 1983 models B21FT New smaller air control valve Group 25 Intake exhaust emission systems Specifications Idle speeds 1981 models 1982 models oe Ela EG a ee B21F LH Jetronic
14. advised to use a high quality voltmeter metering range 0 to approx 15 20 volts For the resistance tests an ohmmeter with a range of 100 to 10 000 ohms is needed Most common faults are bad connections in the multipin connectors on firewall at the Electronic Control Unit and at the Coolant Temperature Sensor System voltage and currents are low 133368 In some tests below it is suggested an alternate testing method using a test lamp It uses more current than a voltmeter or ohmmeter and might in some cases reveal a bad connection better WARNING In any test DO NOT press in the test point between the terminal contacts just TOUCH Otherwise terminal contacts may be permanently damaged 133428 Prepare for test Remove panel in front of right front door Disconnect both connectors at the Electronic Control Unit Switch ignition ON 133361 Black connector Check current supply Ignition ON Terminal 1 is positive energized from ignition switch Terminal 2 is negative ground Connect voltmeter alt test lamp across terminals 1 and 2 in connector Voltmeter should read battery voltage test lamp illuminate fully No reading first check alternate ground then check fuse No 13 133362 11 Group 25 Intake exhaust emission systems Fault tracing Check throttle switch micro switch Ohmmeter ignition can be OFF Connect ohmmeter test leads across terminal 8
15. es C18 Setting micro switch Move micro switch DOWN until test light just goes out Remove feeler gauge instruments etc Install panel Group 25 Intake exhaust emission systems Basic setting B21F LH Jetronic 1982 Basic setting of Constant Idle Speed System B21F LH Jetronic 1982 Engine Identification Number EIN 498962 manual transmission 498963 automatic transmission Seat throttle butterfly valve Loosen stop nut on adjuster screw Unscrew adjuster screw a couple of turns Make sure throttle butterfly valve is properly seated in housing Set adjuster screw Screw in adjuster screw until it just touches lever then additional 1 4 turn Lock with lock nut 133375 D2 Disconnect connector at firewall 133376 D3 This illustration shows location of connector 31 Group 25 Intake exhaust emission systems Basic setting B21F LH Jetronic 1982 D4 Test on idle speed Connect test lamp across battery plus and orange wire terminal in connector Start engine Test light should illuminate at idle speed If not readjust adjuster screw for throttle butterfly valve position 133378 D5 Open throttle slightly Engine running on idle Open throttle slightly by hand at throttle control lever 133379 D6 Test above idle speed u Test lamp should go OUT If not recheck and try a new vacuum switch Group 25 Intake exhaust emission systems Basic setting
16. flow with increased idle speed is engaged Reduced air flow occurs when the throttle switch circuit is closed during deceleration Test point for basic idle setting High flow driving New throttle switch B28F Increased air flow at normal driving speeds with New feature on 1983 models accelerator pedal depressed Regulated flow idle Maintains steady idle speed New air control valve Group 25 Intake exhaust emission systems CIS system description 130549 Electronic Control Unit Receives information from three sources Coolant temperature sensor gives input to provide higher idle rpm at low temperatures Terminal 1 on ignition coil provides information on engine speed Amicro switch at the throttle provides input when the throttle control is at idle position The Electronic Control Unit is located below the Control Unit for the Lambda sond system in front of right front door Air Control Valve Bypasses air around the throttle valve A small electric motor rotates clockwise or counter clockwise depending on signal from the Electronic Control Unit The valve responds very quickly to obtain a precise air flow Left Air Control Valve for B21F 1981 Left Air Control Valve for B28F Air Control Valve for B21F Turbo is located in front under intake manifold Throttle switch The throttle actuates a micro switch which controls a circuit in the Electronic Control
17. h incorrectly adjusted Temperature sensor faulty or not connected Throttle butterfly valve incorrectly adjusted No idle speed control Bad contact in connector Throttle switch incorrectly adjusted Electronic Control Unit faulty Air control valve faulty Engine stalls when braking to stop CO adjustment incorrect Ignition timing incorrect Throttle butterfly valve incorrectly adjusted Faulty contact in connector Electronic Control Unit faulty Low basic idle speed No high idle speed when cold Air control valve sticks Electronic Control Unit faulty Air control valve faulty Coolant temperature sensor faulty Group 25 Intake exhaust emission systems Fault tracing Fault tracing CIS system 1 IMPORTANT Check wires and connectors These fault tracing procedures assume that the engine This is a very important part of the fault tracing procedures itself is in good operating condition and that ignition Bad contacts cause many problems timing is correctly adjusted Test only with engine at Operations illustrations a m below will underscore this im normal operating temperature Engine OFF when dis portance and at the same time show various connectors connecting connectors Electronic control unit connectors S Check connectors at Electronic Control Unit Remove panel in front of right front door to gain access to the unit Blue connector at
18. her jumper wire across terminals 5 and 2 Start engine Engine should obtain a high idle speed of 1600 2400 rpm indicating that the air control valve is in order 133366 10 Engine does NOT obtain that high idle speed Indicates that the air control valve is defective No fault is found Try a new Electronic Control Unit Check operation Reconnect connectors Make sure all connections are in order Check for proper operation 133367 13 Group 25 Intake exhaust emission systems Basic setting B21F 1981 Basic setting of Constant Idle Speed System B21F 1981 Engine Identification Number EIN 498892 manual transmission 498893 automatic transmission Al Disconnect throttle control rod At lever Check cable assembly Make sure cable and pulley run smoothly and do not bind in any position 130858 A2 Remove panel in front of right front door Electronic Control Unit for Constant Idle Speed System is located below Electronic Control Unit for Lambda sond system 133310 A3 De activate Electronic Control Unit Disconnect white red wire from terminal 12 of blue connector plug at Electronic Control Unit Reinstall connector plug NOTE Same wire ends at ignition coil but cannot be disconnected there 133381 14 Group 25 Intake exhaust emission systems Basic setting B21F 1981 A4 Connect tachometer Good instrument to accurately measure engine RPM
19. ignition system When the air conditioning is operat ing a micro switch at the AC switch energizes terminal 7 of the ECU This will increase idle speed from approx 750 rpm to 900 rpm and improve AC operation and cooling due to faster running coolant pump and fan AC switch e white green or red white red for gray Idle speed Above idle speed Ground circuit through throttle switch C is interrupted Ground circuit through throttle switch C is closed ECU The Electronic Control Unit A ECU controls air con H controls air control valve H to set high air flow to trol valve H to set correct idle speed avoid engine stalls blue 16 LIKE blue yelLow 12 Lg 3 898 yes shrte green op red TT _ shite red for gra L _ mr m 4 white red or gray E m L a Group 25 Intake exhaust emission systems Wiring diagrams to terminal 7 of ign system ECU CIS SYSTEM blue white OXYGEN SENSOR SYSTEM 133443 41 Group 25 Intake exhaust emission systems Wiring diagrams de CIS System Turn signals El Seat Gen warning B21 F LH Jetronic CIS System Legend A ECU Electronic Control Unit B Seat belt reminder unit C Throttle switch S D Ignition switch To terminal 7 of Electronic E Fuel pump relay Contrel Unit for ignition F Fuse box system and ee terminal 3 of LH Jetronic G Control
20. ma EE m z _ Fa m F1 i Group 25 Intake exhaust emission systems Wiring diagrams A A8 NA 4 NA ee Wb 31 87 nr EN EE 8 ES e Bi 1 DJ T Le eil Ra ol El EL LADD ere el b ag l i B KS W LA EN Ve CIS system ou blue white OXYGEN ASA SENSOR SYSTEM Group 25 Intake exhaust emission systems Wiring diagrams t control test point Em tte gt G white red for gray _ CIS System B21F Turbo B21F Turbo Intercooler Fuse No 13 Instruments Turn signals Seat belt warning CIS System Legend A ECU Electronic Control Unit B Seat belt reminder unit C Throttle switch D Ignition switch E Fuel pump relay F Fuse box G Control test point H Air control valve Coolant temperature sensor J Ignition coil K Ballast resistor General Coolant temperature sensor I con tinuously sends a signal to the ECU so it can set an idle speed that corres ponds to the coolant temperature G is designated control test point It is a connection that for convenience is used on the production line Idle speed Above idle speed Ground circuit through throttle switch C is interrupted Ground circuit through throttle switch C is closed ECU The Electronic Control Unit A ECU controls air con H controls air contro valve H to set high air flow to trol valve H to set correct idle speed avoid engine stalls
21. n place Best way is to insert a copper wire along terminal wire 133384 26 Group 25 Intake exhaust emission systems Basic setting B21F Turbo 1981 1984 821F Turbo Intercooler 1984 C7 Connect test lamp Connect across battery positive terminal and orange wire terminal on micro switch NOTE Test light MUST NOT illuminate while adjusting idle speed electric circuit through micro switch is open See op C7 130891 C8 If test light illuminates adjust micro switch position Slacken micro switch retaining screws Move micro switch DOWN until test light goes OUT Tighten screws This is a temporary adjustment Final adjustment will follow later on 130892 C9 Connect tachometer Good instrument to accurately measure engine speed Start engine Should be at normal operating temperature Idle speed should be 850 rpm 850 900 rpm permitted If not see op C9 C15 133390 27 Group 25 Intake exhaust emission systems Basic setting B21F Turbo 1981 1984 B21F Turbo Intercooler 1984 Adjusting idle speed justing i p zT re Adjust throttle position Use throttle position adjustment screw to adjust idle speed to 850 rpm 850 900 rpm permitted NOTE Test light MUST NOT illuminate If necessary readjust micro switch position DOWN THROTTLE POSITION 5 ADJUSTMENT SCREW 130893 C11 Activate Electronic Control Unit B21F Turbo 1
22. ning screws 130912 38 Group 25 Intake exhaust emission systems Basic setting B28F 1981 1982 E18 Checking full throttle enrichment switch operation Disconnect green wire at micro switch Connect test light between micro switch terminal and battery posi N tive terminal Ma IN WA Turn pulley slowly to full throttle stop Test light should ls N illuminate 4 to 1 mm 2 to 1 22 before pulley touches 1 4 mM stop RNA 0 04 0 15 Adjust as necessary see E17 Ss gt 130913 39 Group 25 Intake exhaust emission systems Wiring diagrams Fuse No 13 Instruments CIS System Turn signals Seat belt warning B21 F Cl CIS System red 10 red 12 x D E s Cl J Legend A ECU Electronic Control Unit B Seat belt reminder unit C Throttle switch D Ignition switch to Electronic Control E Fuel pump relay Controlled TH F Fuse box AR G Control test point H Air control valve Coolant temperature sensor J Ignition coil K Ballast resistor blue yelLow 12 ta control test point General era G Coolant temperture sensor I con tinuously sends a signal to the ECU so l it can set an idle speed that corres 6 ponds to the coolant temperature G is designated control test point It is a connection that for convenience is used on the production line Throttle switch C has a double func tion At idle it grounds a wire con nected to the ECU for
23. o Color point Volvo P N Bosch No Color point Electronic Control Unit 1276897 4 0280 220003 Green 1306544 6 0 280 220 002 White 1276897 4 0280 220003 Green 1274293 8 0280 220001 Yellow 1317499 0 0280 220 005 Orange 1317499 0 0280 220005 Orange 1317433 0 0280 220 005 Orange 1274452 0 0280 220008 Gray 1317499 0 280 220 005 Orange 1317499 0 280 220 005 Orange Normal running Electronic Control Unit activated rpm lower upper limit 900 850 950 750 700 800 900 850 950 900 850 950 750 730 770 750 730 770 900 880 920 900 880 920 Coolant temperature sensor 1306024 9 0280 130 028 1306024 0 0 280 130 028 1306024 9 0280 130028 1306024 9 0 280 130 028 1306937 2 0280 130023 1306937 2 0280 130023 1306937 2 0280 130023 1306024 9 0280 130028 1306937 2 0 280 130 023 1306937 2 0 280 130 023 Air control valve 1276871 9 0 280 140 500 1276871 9 0280 140 500 1276871 9 0 280 140 500 1276871 9 0 280 140 500 1276871 9 0 280 140 500 1276871 9 0280 140 500 1276871 9 0280 140 500 1276871 9 0 280 140 500 1316957 7 0 280 140 501 1317957 7 0 280 140 501 Group 25 Intake exhaust emission systems Specifications Resistance temperature specification Coolant temperature sensor ohms Volvo P N 1306024 9 Bosch 280 130 028 pah sl E eR Volvo P N 1306024 9 ee Tal SE sae Bosch No 0 280 130 028
24. panel etc 13088 24 Group 25 Intake exhaust emission systems Basic setting B21F Turbo 1981 1984 B21F Turbo Intercooler 1984 Basic setting of Constant Idle Speed System B21F Turbo 1981 Engine Identification Number EIN 498898 manual transmission automatic not available B21F Turbo 1982 Engine Identification Number EIN 1982 1983 1984 except intercooled 1984 intercooled manual transmission 498966 499800 499868 499926 automatic transmission 498967 499801 499869 499927 C1 Disconnect throttle control rod At throttle lever Check cable assembly Make sure cable and pulley run smoothly and do not bind in any position Check throttle Make sure throttle shaft and throttle plate do not bind in any position 130830 25 Group 25 Intake exhaust emission systems Basic setting B21F Turbo 1981 1984 B21F Turbo Intercooler 1984 Wl C4 E EEN Remove panel in front of right front door Electronic Control Unit for Constant Idle Speed Systems is located below Electronic Control Unit for Lambda sond system 133310 C5 B21F Turbo 1981 De activate Electronic Control Unit Disconnect white red wire at terminal 12 of blue connector plug at Electronic Control Unit NOTE Same wire ends at ignition coil but cannot be disconnected there 133381 C6 B21FT 1982 B21FT Intercooler 1984 De activate Electronic Control Unit Ground terminal 10 connector i
25. st lamp Connect across battery positive terminal and orange wire terminal on micro switch 1981 test light should illuminate while adjusting electric circuit through micro switch is closed 1982 test light shuld NOT illuminate while adjusting electric circuit through micro switch is interrupted Connect tachometer 130904 ES Start engine Should be at normal operating temperature Adjust idle speed 850 rpm 850 900 rpm permitted Adjust at throttle position adjustment screwn DO NOT adjust idle speed screw It should be screwed to the bottom Group 25 Intake exhaust emission systems Basic setting B28F 1981 1982 E10 B28F 1982 B28F 1981 a Activate Electronic Control Unit B28F 1981 Reconnect white red wire in blue connector plug at Electronic control unit B28F 1982 Disconnect test point from ground 133393 Ell idle speed change After activating Electronic Control Unit idle speed should change to 900 rpm 1981 permitted 850 950 rpm 1982 permitted 880 920 rpm Stop engine install panel etc 130885 re ES SS Adjusting CO OS a agan S anaa gagana E12 Reconnect throttle control rod at cable pulley Disconnect throttle cable and automatic transmission kickdown cable Cable pulley should be completely retracted Adjust control rod length as necessary Group 25 Intake exhaust emission systems Basic setting B28F 1981 1982 E1
26. tem B21F MPG 1981 Engine Identification Number EIN 498896 manual transmission 498897 automatic transmission B21F CI 1982 Engine Identification Number EIN 498960 manual transmission 498961 automatic transmission B1 Disconnect throttle control rod At lever 133385 B2 Check cable assembly Make sure cable and pulley run smoothly and do not bind in any position 133386 B3 Remove panel in front of right front door Electronic Control Unit for Constant Idle Speed System is located below Electronic Control Unit for Lambda sond system 133310 TT bvb Group 25 Intake exhaust emission systems Basic setting B21F MPG 1981 B21F CI 1982 B4 B21F MPG 1981 De activate Electronic Control Unit Disconnect white red wire at terminal 12 of blue connec tor plug at Electronic Control Unit NOTE Same wire ends at ignition coil but cannot be discon nected there 133381 B21F CI 1982 De activate Electronic Control Unit Ground terminal 10 connector in place Best way is to insert a copper wire along terminal wire 133384 B6 a Connect tachometer Pr Es Good instrument to accurately measure engine RPM teal gt de Ms 2 i Man De U SR Li Connect test lamp Connect across battery plus terminal and terminal on micro switch with yellow wire connected Start engine Should be at normal operating temperature 1308
27. tems Basic setting B21F 1981 A10 Reconnect throttle control rod at lever Cable pulley should be completely retracted lf adjustments of engine controls must be made follow operations A11 A13 below 130866 EEE ee TEE u EEE ENEE Adjusting controls All Adjust control rod length Disconnect throttle cable and automatic transmission kickdown cable Adjust control rod length as necessary 130867 A12 Attach and adjust throttle cable 130868 17 Group 25 Intake exhaust emission systems Basic setting B21F 1981 A13 CABLE LENGTH BEING S e PULLED OUT Automatic transmission kickdown cable Check cable length at closed and open throttle engine off Open throttle measurement should be checked with throttle pedal in car depressed NOT by actuating linkage by hand Cable should be pulled out 50 mm 1 968 130869 Adjusting micro switch RE pai a a TS A14 Move micro svvitch UP Engine NOT running throttle CLOSED Slacken micro switch retaining screws Move micro switch UP until test light illuminates 130870 A15 Set micro svvitch position nh ag ee Move micro switch DOWN 2 5 5 mm 0 08 0 10 Test Ps w l I ki light MUST NOT illuminate a C NAH NG Tighten screws S W Wa Remove test lamp install panel etc 130871 Group 25 Intake exhaust emission systems Basic setting B21F MPG 1981 B21F CI 1982 Basic setting of Constant Idle Speed Sys
28. test point Control Unit H Air control valve Tira Coolant temperature sensor ES J Ignition coil K Ballast resistor Fe P ta control test point General eis Coolant temperature sensor I con BR tinuously sends a signal to the ECU so it can set an idle speed that corres ponds to the coolant temperature G is designated control test point It is a connection that for convenience is used on the production line Throttle switch C has a double func tion At idle it grounds a wire con nected to the ECU for ignition system When the air conditioning is operat ing a micro switch at the AC switch energizes terminal 7 of the ECU This will increase idle speed from approx 750 rpm to 900 rpm and improve AC operation and cooling due to faster running coolant pump and fan switch ali white green or red white red for gr Idle speed Above idle speed Ground circuit through throttle switch C is interrupted Ground circuit through throttle switch C is closed ECU The Electronic Control Unit A ECU controls air con H controls air control valve H to set high air flow to trol valve H to set correct idle speed avoid engine stalls ate i red 10 red 12 15 lue yellow 12 blue 18 Ta ve L Lon l H A A d white green wiite green z or red or red 15 A Ly wW B i 3 m 15 i white red for gray 3 a _ s_ _swhite red or gray E WH
29. top and black connector at bottom ry INN DIT Connectors on firewall There are two connectors on firewall This illustration shows B28F but is typical for all models Group 25 Intake exhaust emission systems Fault tracing d Connector on firevvall This illustration is typical for all engines all cars Shows B21F LH jetronic with cruise control e Firevvall connector disconnected Firevvall connector B28F 33351 g The other firewall connector Typical location also applicable to B28F 133352 8 Group 25 Intake exhaust emission systems Fault tracing Air control valve connectors a e Ve RK S e Air control valve B21F 1982 m ae Connector disconnected Air control valve B21F LH Jetronic 1982 Connector disconnected Group 25 Intake exhaust emission systems Fault tracing l Air control valve B28F m Connector disconnected 2 H engine idle speed is considerably lower than specified Check air hoses for obstructions The air control valve can be stuck or obstructed by deposits from the Positive Crankcase Ventilation PCV system Check oil replacement intervals and engine oil quality Clean PCV system Photos show B21F Turbo Note two clamps and strip between them Group 25 Intake exhaust emission systems Fault tracing Testing CIS system For the tests it is
30. y T1 FH 1 133454 Group 25 Intake exhaust emission systems Wiring diagrams 3Ib 3 87 PTA ao Ada E ah RANG CIS SYSTEM up bue white red OXYGEN SENSOR SYSTEM
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