Electrical Troubleshooting
Contents
1. Measure the voltage between BLU YEL BLK RED the A5 BLU YEL and A25 BLK RED terminals Repair short to power source in BLU YEL wire between the A5 Is there voltage terminal and the shift control solenoid valve 12 24 0 NO A Turn the ignition switch OFF Measure the resistance between the AS BLU YEL and A25 BLK RED terminals BLU YEL BLK RED Check for open in BLU YEL wire between the A5 terminal and the Is the resistance 12 24 0 shift control solenoid valve A If wire is OK check the shift control solenoid valve A Disconnect the 2P connector from the shift control solenoid valve assembly Check for continuity between the A5 BLU YEL and A25 BLU YEL BLK RED BLK RED terminals Repair short to ground YES in BLU YEL wire be ts there continuity tween the A5 terminal and the shift control NO solenoid valve A Connect the 2P connector to the shift control solenoid valve assembly Check for loose control unit con nectors If necessary substitute a known good control unit and recheck 9 64 KB other Self diagnosis indicator light blinks eight times Disconnect the 26P connector from the control unit Turn the ignition switch ON Measure the voltage between the A3 GRN WHT and A25 BLK RED terminals YES Is there voltage NO Repair short to power source in GRN WHT wire between the2. Check for short in GRN RED wire between the A21 terminal and the shift position console switch If wire OK check for loose control unit connectors If necessary substitute a known good control unit and re check Is there battery voltage Shift to other than N and P position A19 A25 ooo0oo0o0o0oo00o00o000 900000 0000000 Check for short in LT GRN wire between the A19 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 9000000000 CoO0O00000000 Measure the voltage between the A19 and A25 terminals Is there battery voltage To page 9 61 9 60 From page 9 60 Shift to other than position A17 A25 oooo0oo00000000oji iie Hooo0oo0oo0oo0oo00000 9000000000000 Of E ooo0oo0o0000000 Check for short in GRN BLK wire between the A17 terminal and the shift position console switch If wire is OK check for loose control unit connectors If necessary substitute a known good control unit and re check Measure the voltage between the A17 and A25 terminals lt ts there battery voltage YES Shift to other than position A15 A25 oaa oocoooo0oo0o000000j Check for short in GRN BLU wire between the A15 terminal and the shift position consol
3. Set the parking brake securely and block the rear wheels Jack up the front of the car and support with a rigid Jack up the front of the car and jack block one wheel BLK RED Disconnect the 26P and 22P connectors from the control unit Turn the ignition switch ON Rotate the front wheel and check for voltage between the A25 BLK RED and D9 ORN ter minals Check for short or open in ORN wire between the D9 terminal and the speed sensor If wire is OK check the speed sensor Does the voltage O 5 V appear alternately Check for loose control unit con nectors If necessary substitute a known good control unit and recheck cont d 9 59 Electrical Troubleshooting Troubleshooting Flowchart cont d KB other Self diagnosis indicator light blinks five times Turn the ignition switch ON Observe the A T shift indicator and select each position sepa rately does the indicator light properly YES 5 Turn the ignition switch OFF Connect the Test Harness be tween the control unit and connectors Turn the ignition switch ON Shift to other than R position ooooo0oo0oo0000000 joooo0oo0oo000000 oocooooo0oo000000 OO SO OHOOOOCO0O00O0O Measure the voltage between the A21 and A25 terminals See A T shift position indicator inspection Section 16
4. 9 56 KB other Self diagnosis indicator light blinks twice Disconnect the 26P connector from the control unit Turn the ignition switch ON Measure the voltage between the A4 GRN BLK and A25 BLK RED terminals Is there voltage NO Turn the ignition switch OFF Measure the resistance between the A4 GRN BLK and A25 BLK RED terminais Is the resistance 12 24 Q Disconnect the 2P connector from the lock up control solenoid valve assembly Check for continuity between the A4 GRN BLK and A25 BLK RED terminals Is there continuity Connect the 2P connector to the lock up control solenoid valve assembly Check for loose control unit con nectors If necessary substitute a known good control unit and recheck Repair short to power source in GRN BLK wire between the A4 terminal and the lock up control solenoid valve B Check for open in GRN BLK wire between the A4 termi nal and the lock up control solenoid valve B If wire is OK check the lock up control solenoid valve B Repair short to ground in GRN BLK wire be tween the A4 terminal and the lock up control solenoid valve B ov GRN BLK BLK RED 12 24 0 GRN BLK BLK RED 00 NOTE View from wire side GRN BLK BLK RED cont d 9 57 Electrical Troubleshooting Troubleshooting Flowchart cont d KB other Self diagnosis ind
5. 400 600 NO Replace the NC speed ohms 20 C sensor YES from the control unit Check for continuity between D17 BLU GRN terminal and body ground Check for continuity between D15 BLU YEL terminal and body ground Disconnect the 22P connector 400 600 07 ESSES EENES BLU YEL BLU GRN To page 9 67 NOTE View from wire side 9 66 From page 9 66 Repair short in BLU GRN or BLU YEL wire between D17 and D15 terminals and the NC speed sensor Is there continuity Reconnect the NC speed sensor Measure the resistance between D17 BLU GRN and D15 BLU YEL terminals Repair short in BLU 4 Is the resistance 400 600 NO GRN or BEU YEL wire between D17 and D15 ohms 20 C terminals and the NC YES speed sensor Check for loose control unit con nector If necessary substitute a known good control unit and recheck cont d 9 67 Electrical Troubleshooting Troubleshooting Flowchart cont d KB other Self diagnosis indicator light blinks ten times Turn the ignition switch ON Check whether the Check Engine warning light blinks Section 6 NOTE View from wire side Repair the PGM FI System See Section 6 Does Check Engine warning light indicator blink BLK RED NO Turn the ignition switch
6. OFF Disconnect the 26P and 22P connectors from the control unit aan Turn the ignition switch ON Measure the voltage between the D18 LT GRN BLK and A25 BLK RED terminals E Is the voitage 4 75 5 25 V LT GRN BLK Repair open or short in 4 75 5 25 V LT GRN BLK wire be tween the D18 ter minal and the D14 ter minal of the ECU Turn the ignition switch OFF e T Connect the Test Harness be tween the control unit and the connectors 0 5 1 2 V Q A25 D5 oooo00000000000000000 GIOOOOAONONO000N ooocooooo0oo0oo0000000000000 Hoo0oo0o00000000 Start the engine and warm it up to normal operating temperature Measure the voltage between the D5 and A25 terminals Repair open or short in YEL GRN_ wire be tween the D5 terminal and the coolant tem perature sensor is the voltage 0 50 1 20 V Check for loose control unit con nectors If necessary substitute a known good control unit and recheck 9 68 KB other Self diagnosis indicator light blinks eleven times NOTE View from wire side BLU BLK RED Disconnect the 26P connector from the control unit Shift to P position Measure the voltage between the A9 BLU and A25 BLK RED terminals NO Repair open or short in Is there battery voltage BLU wire between the A9 termi
7. sensor YES To page 9 73 To page 9 73 9 72 From page 9 72 From page 9 72 Repair open in ORN BLU wire between D19 terminal and the NM speed sensor Is there continuity YES Check for continuity between D12 WHT BLU terminal and the NM speed sensor lt Is there continuity Repair open in WHT BLU wire between D12 terminal and the NM speed sensor Run Electrical Troubleshooting for code 9 Check for loose control unit con Check for loose control unit con nector If necessary substitute a nectors if necessary substitute known good control unit and a known good control unit and recheck recheck cont d 9 73 Electrical Troubleshooting Troubleshooting Flowchart cont d KB other Da indicator light is on steady not blinking whenever the igni tion switch is ON Turn the ignition switch OFF ol PN Disconnect the 26P and 22P connectors from the control unit Connect the Test Harness to the control unit Turn the ignition switch ON Measure voltage between A8 GRN terminal and body ground NO r Is there voltage Replace the A T control unit YES Measure voltage between the GRN wire at the gauge assy to body ground Replace faulty shift position in dicator Is there voltage Repair short to p
8. A3 terminal and shift con trol solenoid valve B Turn the ignition switch OFF Measure the resistance between the A3 GRN WHT and A25 BLK RED terminals NO Is the resistance 12 24 0 YES Check for open in GRN WHT wire between the A3 termi nal and the shift control solenoid valve B If wire is OK check the shift control solenoid valve B Disconnect the 2P connector from the shift control solenoid valve assembly Check for continuity between the A3 GRN WHT and A25 BLK RED terminals oto YES Is there continuity NO Repair short to ground in GRN WHT wire be tween the A3 terminal and the shift control solenoid valve B Connect the 2P connector to the shift control solenoid valve assembly Check for loose control unit con nectors If necessary substitute a known good control unit and recheck NOTE View from wire side ov GRN WHT BLK RED 12 24 0 GRN WHT BLK RED GRN WHT BLK RED cont d 9 65 Electrical Troubleshooting Troubleshooting Flowchart cont d KB other Self diagnosis Da indicator tight blinks nine times Check the state of installation of the NC speed sensor NO Reinstall and recheck YES Disconnect the 2P connector from the NC speed sensor connector Measure the resistance of the NC speed sensor Is the resistance
9. Electrical Troubleshooting Troubleshooting Flowchart KB other Self diagnosis Da indicator light NOTE View from wire side blinks once BLK RED Disconnect the 26P connector from the contro unit F Turn the ignition switch ON e ignition switc YEU ov Measure the voltage between the A6 YEL and A25 BLK RED terminals Repair short to power source in YEL wire be tween the A6 terminal and the lock up control solenoid valve A Is there voltage NO Turn the ignition switch OFF BLK RED Disconnect the 2P connector from the lock up control solenoid valve assembly Check for continuity between YEL the A6 YEL and A25 BLK RED 00 terminals Repair short to ground YES in YEL wire between Is there continuity the A6 terminal and the lock up control solenoid valve A Connect the 2P connector to the lock up control solenoid valve assembly Measure the resistance between the A6 YEL and A25 BLK RED terminals Check for open in YEL wire between the A6 terminal and the lock BLK RED up control solenoid valve A If wire is OK check the lock up con trol solenoid valve A lt Is the resistance 12 24 Q YES Check for loose control unit con nectors If necessary substitute a known good contro unit and recheck 12 24 0
10. cessary substitute a known good control unit and recheck Repair short in BRN WHT wire cont d 9 71 Electrical Troubleshooting Troubleshooting Flowchart cont d KB other Self diagnosis indicator light blinks fifteen times NOTE A code 15 on the A T control unit doesn t always mean there s an electrical problem in the NM or NC circuit code 15 may also indicate a mechanical pro blem in the trans Check the state of installation of NM and NC speed sensor NO gt Reinstall and recheck YES Disconnect the 2P connector from the NM speed sensor Measure the resistance of the NM speed sensor Is the resistance 400 600 ohms 20 C Replace the NM speed sensor NOTE View from wire side Disconnect the 22P connector from the control unit ORN eee eis Ca BLU C heck the continuity between D19 ORN BLU and D12 WHT BLU terminals and body ground Repair short in ORN WHT BLU YES BLU or WHT BLU Is the continuity wires between D19 and D12 terminals and No the NM speed sensor _ ____1 the NM speed sensor Measure the resistance between Reconnect the 2P connector to D19 ORN BLU and D12 WHT BLU terminals NO Check for continuity between Bade a Mis 400 609 D19 ORN BLU terminal and the ohms NM speed
11. connect the 26P and 22P connectors from the control unit f Measure the voltage between D2 GRN WHT and A25 BLK RED terminal with the brake pedal pushed ar lt Is there battery voltage YES Brake light signal OK Faulty brake light circuit Repair open in GRN WHT wire between D2 terminal and brake light switch NOTE View from wire side HE GRN WHT BLK RED 9 76 KB other Inspection of the A C signal Start the engine Turn the blower switch ON Push the A C switch ON Does A C compressor clutch engage See Air Conditioner inspection Section 15 YES Stop the engine Disconnect the 26P connector from the control unit Start the engine Measure the voltage between A22 RED BLU and A25 BLK RED terminais A C compressor OFF Repair open in RED BLU wire be tween A22 terminal and A C clutch relay Is there battery voltage YES NOTE View from wire side BLK RED RED BLU 9 77
12. dicator light blinks six times Turn the ignition switch ON A Observe the A T shift indicator and select each position sepa rately NO See A T shift position Does the indicator light properly indicator inspection Section 16 YES Turn the ignition switch OFF Connect the Test Harness be tween the control unit and connectors Turn the ignition switch ON al A21 A25 me CO0000000000 Of Blo0O000000000 Shift to R position oooooo0oo0oo0oo 0oo0oo0o0 oooo0oo0oo0oo0o0o000 Measure the voltage between the A21 and A25 terminals Repair open in GRN RED wire between the A21 terminal and the shift position console switch Is there voltage NO Shift to N or P position Measure the voltage between the A19 and A25 terminal lt Is there voltage A19 A25 ooooo0oo0oo0000000 0 oooo0oo0oo0o0000000 Repair open in LT GRN wire between the A19 terminal and the shift position console switch oooo0oo0oo0000 0 0 Hooo0oo0oo0000000 xo To page 9 63 9 62 From page 9 62 A17 A25 Shift to position Measure the voltage between the ooooo0oo0oo0oo0o00000 A17 and A25 terminals oocooocooo0oo0oo0o00000 Repair open in GRN YES BLK wire between the Is there voltage Oe A17 terminal and the shift position console NO switch Shift to Da p
13. e switch If wire is OK check for loose control unit connectors If necessary substitute a known good control unit and recheck Measure the voltage between the A15 and A25 terminals NO Is there battery voltage YES o0o000000000 Hoooo0oo0o000000 Shift to other than position A13 A25 oooo0o000000000j ooo0oo0o00000000of Check for short in GRN YEL wire between the A13 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 oooooo0oo0oo0000 ooo0oo0o0000000 Measure the voltage between the A13 and A25 terminals NO Is there battery voltage YES Shift to other than O position A11 A25 ooo0oo0o000000000 oooo0oo0o00000000 Check for short in LT GRN WHT wire between the A11 terminal and shift position console switch or shift position indicator If wire is OK check for loose control unit connectors if necessary substitute a known good control unit and recheck oo000000000 OoOo00000 00000 Measure the voltage between the A11 and A25 terminals Is there battery voltage Check for loose control unit connectors If necessary substitute a known good control unit and recheck cont d 9 61 Electrical Troubleshooting Troubleshooting Flowchart cont d KB other Self diagnosis in
14. icator light blinks three times Turn the ignition switch ON l Check whether the Check Engine warning light blinks Section 6 Does the Check Engine warning light blink NOTE View from wire side Repair the PGM FI Sys _ tem See Section 6 NO BLK RED Turn the ignition switch OFF Fj Zea Disconnect the 26P and 22P E i ea Ss ee O connectors from the control unit 4 75 5 25 V Turn the ignition switch ON Measure the voltage between the D18 LT GRN BLK and A25 BLK RED terminals Repair open or short in LT GRN BLK LT GRN BLK wire be tween the D18 ter Is the voltage 4 75 5 25 V minal and the D14 ter minal of the ECU YES Turn the ignition switch OFF 0 44 0 5 V A25 D7 Connect the Test Harness be tween the connectors and the m control unit ooooo0oo0o0000000 amp oo0000000000 oooooo0oo0oo0oo0oo0oo0o0o0 ooo0oo0oo0o000000 Turn the ignition switch ON Measure the voltage between the D7 and A25 terminals alia Is the voltage 0 44 0 56 V YES 10 Check for loose control unit con nectors If necessary substitute a known good control unit and recheck Repair open or short in RED BLK wire be tween the D7 terminal and the throttle angle sensor 9 58 KB other Self diagnosis indicator light blinks tour times
15. nal and the ig nition coil YES Check for loose control unit con nectors If necessary substitute a known good control unit and recheck cont d 9 69 Electrical Troubleshooting Troubleshooting Flowchart cont d mm KB other Self diagnosis Da indicator light blinks fourteen times Start the engine and warm it up to normal operating temperature Shift to P position Turn the ignition switch OFF Connect the Test Harness be tween the control unit and connectors Turn the ignition switch ON and wait for at least two seconds SE Using an analog voltmeter measure the voltage between the D16 and A25 ter minals Is there approx 5 V for over five seconds YES Jack up the front of the car Start the engine SSF Shift to position AWARNING Make sure jacks and safety stands are placed properly see Section 1 While testing be careful of the rotating front wheels 5 v v A25 ooooooo0o000000o0000000 o0000000000 oooooooo0o00000j00000000 EHO O CO0000000 016 Does the meter jerk from O V to 4 V approx every four seconds NO Y Is the Check Engine light on NO Refer to PGM FI A T Signal Section 6 Repair the PGM FI System Section 6 Turn the ignition switch OFF fF Raise the engine to over 2 000 min rpm ove
16. osition Mesure the voltage between the A15 and A25 terminals Is there voltage NO Shift to 2 position ooo0oo0o0oo000000 ooo0oo0oo0000000 n0 A15 A25 ooooo0oo0oo0oo0oo00000 ooo0oo0oo0o00000000 H0o0000000000 90000000000 Repair open in GRN BLU wire between the A15 terminal and the shift position console switch A13 A25 oooo0oo0oo0o0oo0oo0000 ooo0oo0oo0oo000000 000000000000 Of 00000000000 Repair open in GRN YEL wire between the A13 terminal and the shift position console switch Measure the voltage between the A13 and A25 terminals Is there voltage NO Shift to 1 position Measure the voltage between the A11 and A25 terminals Is there voltage NO Check for loose control unit con nectors If necessary substitute a known good control unit and recheck ooooo0oo0000000o0 oo0o0000000000OR Repair open in LT GRN WHT wire be tween the A11 ter minal and the shift position console switch H0o0000000000 OO000000000 cont d 9 63 Electrical Troubleshooting Troubleshooting Flowchart cont d KB other Self diagnosis Da indicator light blinks seven times i Disconnect the 26P connector ov from the control unit TEE EEH NOTE View from wire side
17. ower source on GRN wire between A8 terminal and gauge assembly 9 74 KB other indicator light does not come on with the ignition switch ON It should come on for about 2 seconds Is the service check connector jumped NO Shift to position Does the indicator light come on NO Turn the ignition switch ON Check for voltage on GRN wire at the gauge assy Is there voltage YES Check for continuity on BLK wire from the gauge assembly to body ground Is there continuity YES Replace shift position indicator YES YES NO NO Disconnect the jumper wire and recheck Check for loose control unit con nectors If necessary substitute a known good control unit and recheck Turn the ignition switch OFF Disconnect the 26P and 22P connectors from the control unit Check for continuity between A8 GRN terminal and gauge assembly Is there continuity zZ O Repair open in GRN wire be tween A8 terminal and gauge assembly Repair open in BLK wire between gauge assembly and G401 YES Check for loose control unit connectors If necessary substitute a known good control unit and recheck cont d 9 75 Electrical Troubleshooting Troubleshooting Flowchart cont d KB other Inspection of the brake light signal Check that the brake lights A on with the brake pedal pushed lt Are brake lights ON Dis
18. r 40 mph in 4th gear for five seconds Release and depress the throttle so that the transmission down shifts and upshifts Sie Using an analog voltmeter measure the voltage between D16 and A25 terminals To page 9 71 9 70 Disconnect the A connector from the PGM FI ECU Check for continuity on the BRN WHT wire between the D16 terminal on the A T control unit and the PGM FI ECU To page 9 71 gt From page 9 70 From page 9 70 pag Repair open in BRN WHT wire Is there continuity il YES Check for continuity on the BRN WHT wire between the D16 terminal on the A T control unit and the PGM FI ECU lt Is there continuity E in BRN Check for loose control unit con nectors If necessary substitute a known good control unit and recheck Does the meter jerk toward O V YES only when the transmission shifts NO Apply the brake and shift to e position Turn the ignition switch OFF Disconnect the A connector from the PGM FI ECU Check for continuity on the BRN WHT wire between the D16 terminal on the A T control unit and the PGM FI ECU YES Repair open in BRN WHT wire Check for continuity on the BRN WHT wire between the D16 terminal on the A T control unit and the PGM FI ECU Is there continuity Check for loose control unit con nectors If ne
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