Electrical Troubleshooting
Contents
1. Disconnect the 18P and 12P connectors from the control unit Turn the ignition switch ON Substitute a known good control unit and recheck Rotate the front wheel and check for voltage between the B1 BRN BLK and A6 WHT BLU terminals WHT BLU y BRN BLK l A6 Check for short or open in WHT BLU wire between the A6 Does the voltage 0 5 V appear NO terminai and the alternately gauge assembly If wire is OK check the YES Speed Pulser Sec tion 16 Cruise Con trol Check for loose control unit connectors If necessary substitute a known good control unit and recheck 9 24 Self diagnosis LED indicator blinks five times Check the shift lever position in dicator in gauge for operation Does it operate properly NO YES Turn the ignition switch ON Shift to other than R position Measure the voltage between the A1 GRN RED and B1 BRN BLK terminals Is there battery voltage YES Shift to other than N position Measure the voltage between the A2 GRN and Bi BRN BLK terminals Is there battery voltage YES Shift to other than D position Measure the voltage between the A3 GRN BLK and B1 BRN BLK terminals Is there battery voltage YES To page 9 26 Repair the Shift Le ver Position indica tor Circuit Section 16 Check for short in GRN RED wire be tween the A1 termi nal and the shift position2. GRN YEL wire be tween the A5 termi nal and the shift position console gt NO r Is there battery voltage heck for I trol unit connectors YES If necessary substi tute a known good control unit and recheck BLK terminals Substitute a known good control unit and recheck 9 26 Self diagnosis LED indicator blinks six times Turn the ignition switch ON Check the shift lever position in dicator in gauge for operation Repair the Shift Le ver Position Indica Does it operate properly tor Circuit Section 16 YES Shift to R position View from wire side GRN RED Al B1 BRN BLK i Measure the voltage between the A1 GRN RED and B1 BRN BLK terminals Repair open in GRN YES RED wire between the A1 terminal and the shift position NO console switch Shift to N position GRN a2 P BRN BLK Is there voltage Measure the voltage between the A2 GRN and B1 BRN BLK terminals Repair open in GRN YES wire between the A2 terminal and the shift position con NO sole switch Is there voltage Shift to D position GRN BLK A3 B1 BRN BLK Measure the voltage between the A3 GRN BLK and B1 BRN BLK terminals Repair open in GRN YES BLK wire between Is there voltage the A3 terminal and the shift position NO console switch To page 9 28 cont d 9 27 Electrical Troubleshooting Troubleshooting Flow Chart
3. cont d ________ 9 _ 0o From page 9 27 View from wire side Shift to S position A4 B1 BRN BLK Measure the voltage between the THES A4 GRN BLU and B1 BRN BLK terminals GRN BLU Repair open in GRN YES BLU wire between is there voltage the A4 terminal and the shift position NO console switch Shift to 2 position GRN YEL AS B1 BRN BLK Measure the voltage between the AS GRN YEL and 81 BRN BLK terminals Repair open in GRN YEL wire between f Is there voltage YES the A5 terminal and the shift position NO console switch Check for loose control unit connectors If necessary substitute a known good control unit and recheck 9 28 Self diagnosis LED indicator blinks seven times Disconnect the 12P connector View from wire side from the control unit BRN BLK BLU YEL pq Bt Turn the ignition switch ON i C Measure the voltage between the B4 BLU YEL and B1 BRN BLK terminals Repair short to power source in Is there voltage YES BLU YEL wire be tween the B4 termi trol solenoid valve A Turn the ignition switch OFF BLU YEL BRN BLK B4 B1 NO nal and the shift con Measure the resistance between the B4 BLU YEL and B1 BRN BLK terminais Check for open in BLU YEL wire be tween the B4 termi NO nal and the shift con lf wire is OK check YES the Shift Control So lenoi
4. cont d 9 21 INSPECTION ADAPTOR Electrical Troubleshooting Troubleshooting Flow Chart cont d From page 9 21 N Is the voitage 0 40 0 57 V 2 YES Stop the engine and turn the ig nition switch ON When the throttle valve is fully opened measure the voltage be tween the white clip and the green clip is the voltage 3 80 4 66 V No YES Start the engine When the throttle valve opening is at idle angle measure the volt age between the A16 RED YEL and A14 GRN WHT terminals Is the voltage 0 40 0 57 V No YES Check for loose control unit connectors If necessary substitute a known good control unit and recheck 9 22 Check for short in RED YEL wire between the A16 termi nal and the throttle angle sensor If wire is OK check the throttle angle sensor page 9 36 Check the throttle angle sen sor page 9 36 View from wire side A16 A14 RED YEL GRN WHT Repair open in RED YEL wire between the A16 termi nai and the throttle angle sensor Self diagnosis LED indicator blinks three times Fuel injected engine Turn the ignition switch ON Check whether the PGM FI LED display blinks Section 6 A YES Repair the PGM FI Does the LED blink System Section 6 NO Turn the ignition switch OFF Disconnect the 18P and 12P connectors from the control unit Turn the ignition
5. diagnosis LED indicator blinks ten times Fuel inject ed engine Turn the ignition switch ON Check whether the PGM FI LED display blinks section 6 A N NO Repair the PGM FI YES Tura the ignition switch OFF View from wire side Disconnect the 18P and 12P connectors from the contro unit BRN BLK B1 Turn the ignition switch ON A15 Measure the voltage between the YEL WHT A15 YEL WHT and B1 BRN BLK terminals Repair open or short in YEL WHT wire be 15 i Is the voltage 4 75 5 25 V No tween tho A15 termi nal and the A10 ter minal of the PGM FI YES ECU Turn the ignition switch OFF Connect the 18P and 12P con nectors to the control unit Start the engine and warm it up to BRN BLK normal operating temperature Measure the voltage between the A11 YEL GRN and B1 BRN A11 BLK terminals YEL GRN Repair open or short in YEL GRN wire be tween the A11 termi Is the voltage 0 50 1 20 v nal and the coolant YES temperature sensor Check for loose control unit connectors If necessary substitute a known good control unit cont d 9 33 Electrical Troubleshooting Troubleshooting Flow Chart cont d Self diagnosis LED indicator blinks eleven times connectors from the control unit Disconnect the 18P and 12P Start the engine Measure the voltage between the A10 BL
6. in YEL RED wire between the B11 terminal and the gauge assembly YES BRN BLK Check for open or short in YEL RED wire between the B11 termina and the gauge assembly if wire is OK check the S Indicator Light Butb and the Safety indi cator Circuit 9 16 S won t engage Disconnect the 18P and 12P connectors from the contro unit Check for continuity between the A13 BLU GRN and B1 BRN BLK terminals NO Check for continuity between the A13 BLU GRN and B1 BRN BLK terminals while pressing the S switch Is there continuity NO YES Check for loose control unit connectors If necessary substitute a known good contro unit and recheck View from wire side BLU GRN Check for short in BLU GRN wire be tween the A13 termi nal and the S switch If wire is OK check the S Switch page 9 39 Check for open in BLU GRN wire be tween the A13 termi nal and the S amp S switch If wire is OK check the S Switch page 9 39 cont d 9 17 Electrical Troubleshooting Troubleshooting Flow Chart cont d _________9 ___ Fails to shift from 2nd to first on releasing the brake pedal when stopped in D or S Depress the brake pedal and check that the brake lights come on NO Repair the Brake Do the lights come on Light Circuit Sec tion 16 YES Disconnect the 18P and 12P View from wire side connector
7. Electrical Troubleshooting Troubleshooting Flow Chart S indicator light does not come on with the ignition switch ON It should come on for about 2 sec Disconnect the 12 P connector from the control unit Check for continuity between the B1 BRN BLK terminal and body ground and between the B6 BRN BLK terminal and body ground Is there continuity YES Turn the ignition switch ON Measure voltage between the B2 BLK YEL and B1 BRN BLK terminals and between the B7 BLK YEL and B1 terminals Is there battery voltage YES Turn the ignition switch OFF Measure resistance between the B11 YEL RED and B1 BRN BLK terminals Is the resistance more than 100 Q YES Connect the 12P connector to the control unit Turn the ignition switch ON Be sure that the voltage is available for 2 sec between the B11 YEL RED terminal and B1 BRN BLK terminals Is the voltage 6 12 V NO Check for loose control unit connectors If necessary substitute a known good control unit and recheck NO NO View from wire side BRN BLK B1 B6 Repair open in BRN BRN BLK BLK wire between I I the 81 terminal and G101 G151 and or between the B6 ter minal and G101 Gla BLK YEL B281 BRN BLK YEL RED BRN BLK B1 B11 Repair open or short in BLK YEL wire be tween the B2 B7 ter minal and the dash fuse box Repair Short
8. U and B1 BRN BLK terminals Repair open or short in BLU wire between the A10 terminal and the ignition coil Is there battery voltage Check for loose control unit connectors if necessary substitute a known good control unit and recheck 9 34 View from wire side BRN BLK B1 R A10 BLU LinS A C IDLE BOOST solenoid valve driving signal inspection Car bureted engine Start the engine and warm it up to View from wire side normal operating temperature BRN BLK B1 Disconnect the 18P and 12P connectors from the control unit RED A9 Turn on the air conditioner Measure the voltage between the A9 RED and B1 BRN BLK terminals when the air condi tioner is operating air compres sor is ON Check for open circuit in NO RED wire between the A9 terminal and the B10 termi nai of the PGM CARB con Is there battery voltage YES trol unit if wire is OK check the PGM CARB control unit section 6 Driving signal is normal 9 35
9. console switch if wire is OK check for toose connectors If necessary substi tute a known good control unit and recheck Check for short in GRN wire between the A2 terminal and the shift position console switch If wire is OK check for loose control unit connectors If neces sary substitute a known good control unit and recheck Check for short in GRN BLK wire be tween the A3 termi nal and the shift position console switch If wire is OK check for loose controlunit connectors if necessary substi tute a known good contro unit and recheck View from wire side is GRN RED Al B1 BRN BLK pe GRN a2 B1 i BRN BLK ps a GRN BLK a3 B1 R BRN BLK cont d 9 25 Electrical Troubleshooting Troubleshooting Flow Chart cont d From page 9 25 Shift to other than S position View from wire side ie BRN BLK A4 Measure the voltage between the aul laa A4 GRN BLU and B1 BRN BLK terminals i Check for short in GRN BLU GRN BLU wire be tween the A4 termi nal and the shift position console NO switch If wire is OK is there battery voltage check tor loose coh trol unit connectors YES If necessary substi tute a known good control unit and recheck BRN BLK GRN YEL as B1 Shift to other than 2 position Measure the voitage between the A5 GRN YEL and B BRN Check for short in
10. d Valve A page 9 39 Disconnect the 2P connector from the shift control solenoid valves assembly BLU YEL BRN BLK B4 B1 Check for continuity between the B4 BLU YEL and B1 BRN BLK terminals Repair short to ground in BLU YEL ean ea YES wire between the B4 s there continuity terminal and the shift control sole NO noid valve A Connect the 2P connector to the shift control solenoid valves as sembly Check for loose control unit connectors If necessary substitute a known good control unit and recheck cont d 9 29 Electrical Troubleshooting Self diagnosis LED indicator blinks eight times Disconnect the 12P connector from the control unit Turn the ignition switch ON Measure the voltage between the B5 GRN WHT and B1 BRN BLK terminals is there voltage YES NO Turn the ignition switch OFF Measure the resistance between the B5 GRN WHT and B1 BRN BLK terminals ls the resistance 12 24 Q NO YES Disconnect the 2P connector from the shift control solenoid valves assembly Check for continuity between the B5 GRN WHT and B1 BRN BLK terminals NO Connect the 2P connector to the shift control solenoid valve as sembly Check for loose contro unit connectors If necessary substitute a known good control unit and recheck 9 30 Troubleshooting Flow Chart cont d View from wire side s
11. hort to source in Repair power GRN WHT wire be tween the B5 termi nal and the shift con trol solenoid valve B Check for open in GRN WHT wire be tween the B5 termi nal and the shift con trol solenoid vaive B If wire is OK check the Shift Control So lenoid Valve B page 9 39 Repair short to ground in GRN WHT wire between the B5 terminal and the shift contro sole noid valve B BRN BLK GRN WHT B5 B1 GRN WHT BRN BLK B5 B1 GRN WHT BRN BLK BS B1 i Self diagnosis LED indicator blinks nine times Jack up the front of the car e Set the parking brake securelyand block the rear wheels e Jack up the front of the car andsupport with a rigid rack GRN RED BRN BLK A7 B1 Rotate the front wheels and mea sure the voltage between the A7 GRN RED and B1 BRN BLK terminals Do O and approx 5 V appear NO a Turn the ignition switch OFF YES Disconnect the 18P and 12P connectors from the control unit Substitute a known good Rotate the front wheels and control unit and recheck check for continuity between the A7 GRN RED and B1 BRN BLK terminals GRN RED g BRN BLK A7 B1 Check for open or short in GRN RED wire between the A7 Do continuity and infinity alter N NO terminal and the A T aK stron R ie is OK check the A T Speed Pulser page XES 9 37 Check for loose contro unit connectors If necessary sub
12. r short to WHT BLK ground in WHT BLK wire between the B8 terminal and the lock up control sole noid valve B Self diagnosis LED indicator blinks three times Carbureted engine Turn the ignition switch ON Check whether the PGM CARB LED display blinks section 6 Does the LED blink y NO Turn the ignition switch OFF Connect the inspection adaptor between the throttle angle sensor and the engine wire harness Start the engine and warm it up to normal operating temperature Measure the voltage between the red clip and green clip of the adaptor Stop the engine and turn the ig nition switch ON Is the voltage 4 50 5 50 V N YES When the throttle valve opening is at idle angle measure the volt age between the white clip and the green clip of the adaptor To page 9 22 ES Repair the PGM CARB sys tem section 6 Throttle angle sensor is very near hot engine components THROTTLE ANGLE SENSOR 0 Measure the voltage between the red clip and body ground Is the voltage 4 50 5 50 V NO YES Repair open in GRN WHT wire between the A14 termi nal and the throttle angie sensor 07GMJ ML80100 Repair open or short circuit in YEL WHT wire between the A15 terminal of the A T control unit and the throttle angle sensor and between the throttle angle sensor and the A7 terminal of the PGM CARB control unit
13. r to the lock up control solenoid valve assembly Check for loose control unit connectors If necessary substitute a known good control unit and recheck cont d 9 19 Electrical Troubleshooting Self diagnosis LED indicator blinks twice Disconnect the 12P connector from the control unit Turn the ignition switch ON Measure the voltage between the B8 WHT BLK and B1 BRN BLK terminals Is there voltage YES NO Turn the ignition switch OFF Measure the resistance between the B8 WHT BLK and B1 BRN BLK terminals Is the resistance 14 30 Q YES Disconnect the 2P connector from the lock up control solenoid valves assembly Check for continuity between the B8 WHT BLK and B1 BRN BLK terminals NO Connect the 2P connector to the lock up control solenoid valve assembly Check for loose control unit connectors If necessary substitute a known good control unit and recheck 9 20 Troubleshooting Flow Chart cont d View from wire side BRN BLK WHT BLK B8 short to source in Repair power WHT BLK wire be tween the B8 termi nal and the lock up control solenoid valve B BRN BLK B1 B8 Check for open in WHT BLK WHT BLK wire be tween the B8 termi nal and the lock up control solenoid valve B If wire is OK check the Lock up Control Solenoid Valve B page 9 38 BRN BLK BS Repai
14. s from the control unit BRN BLK B1 o FEHR RNY Measure the voltage between the GRN WHT Alz A12 GRN WHT and B1 BRN BLK terminals Repair open in GRN NO WHT wire between Is there battery voltage the A12 and the brake light switch YES Check for loose control unit connectors If necessary substitute a known good control unit and recheck 9 18 Self diagnosis LED indicator blinks once Disconnect the 12P connector from the contro unit View from wire side Turn the ignition switch ON RED WHT i B3 B d Measure the voltage between the B3 RED WHT and B1 BRN BLK terminals Repair short to BRN BLK power source in YES RED WHT wire be nal and the lock up NO control solenoid i valve A ER B3 B1 Measure the resistance between the B3 RED WHT and B1 BRN BLK terminals Check for open in BRN BLK RED WHT wire be tween the B3 termi nal and the lock up Is the resistance 14 30 Do control solenoid vaive A If wire is OK YES check the Lock up Control Solenoid Valve A page 9 38 Disconnect the 2P connector from the lock up control solenoid valves assembly RED WHT B3 B1 Check for continuity between the B3 RED WHT and B1 BRN BLK terminais Repair short to BRN BLK ground in RED WHT Is there continuity YES wire between the B3 terminal and the lock up control sole NO noid valve A Connect the 2P connecto
15. stitute a known good control unit and recheck cont d 9 31 Electrical Troubleshooting Self diagnosis LED indicator blinks ten times Carbureted engine Turn the ignition switch ON Check whether the PGM CARB LED display blinks section 6 Does the LED blink YES Turn the ignition switch OFF Disconnect the 18P and 12P connectors from the control unit Turn the ignition switch ON Measure the voltage between the A15 YEL WHT and BI BRN BLK terminals Is the voltage 4 50 5 50 V NO YES Turn the ignition switch OFF Connect the 18P and 12P con nectors to the control unit Start the engine and warm it up to normal operating temperature Measure the voltage between the A11 YEL GRN and B1 BRN BLK terminals Is the voltage 0 70 1 60 v NNO YES Check for loose control unit connectors If necessary substitute a known good control unit 9 32 Repair the Troubleshooting Flow Chart cont d _ PGM CARB System sec tion 6 View from wire side BRN BLK B1 A15 YEL WHT Repair open or short in YEL WHT wire be tween the A15 termi nal and the A7 termi nal of the PGM CARB CONTROL UNIT BRN BLK B1 K Al1 YEL GRN Repair open or short in YEL GRN wire be tween the A11 termi nal and the coolant temperature sensor Self
16. switch ON Measure the voltage between the A15 YEL WHT and Bi BRN BLK terminals Repair open or short in YEL WHT wire be Is the voltage 4 75 5 25 v NO_ tween the A15 termi nal and the A10 ter minal of the PGM FI YES ECU Turn the ignition switch OFF Connect the 18P and 12P con nectors to the control unit Turn the ignition switch ON Measure the voltage between the A16 RED YEL and B1 BRN View from wire side A15 YEL WHT A16 BLK terminals RED YEL Repair open or short NO in RED YEL wire be tween the A16 termi Is the voltage 0 44 0 56 V nal and the throttle YES angle sensor Check for loose control unit connectors If necessary substitute a known good control unit and recheck BRN BLK 51 cont d 9 23 Electrical Troubleshooting Troubleshooting cont d ________ UUO Self diagnosis LED indicator blinks four times Jack up the front of the car and block one wheel e Set the parking brake securelyand block the rear wheels e Jack up the front of the car and support with a rigid rack Turn the ignition switch ON and shift transmission to N View from wire side Rotate the front wheel and mea WHT BLU a BRN BLK sure the voltage between the A6 pa WHT BLU and B1 BRN BLK terminals Does the voltage 0 5 V appear NNO Turn the ignition switch OFF alternately YES
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