F Troubleshooting Flow Chart — A/T Shift Position Signal
Contents
1. ai Troubleshooting Flow Chart A T Shift Position Signal Inspection of A T Shift Posi tion Signal Turn the ignition switch ON Observe the A T shift indicator and select each position sepa rately Does the indicator light properly YES Turn the ignition switch OFF Connect the system checker har ness between the ECU and con nector But disconnect B con nector from the wire harness on ly not the ECU See A T shift posi tion Indicator In spection section 16 Turn the ignition switch ON Measure voltage between B7 terminal and A18 termi nal Is there approx 5 V NO YES Turn the ignition switch OFF Substitute a known good ECU and recheck If prescribed voltage is now available repiace the original ECU Reconnect B connector to the wire harness Turn the ignition switch ON Measure voltage between B7 terminal and A18 termi nal in Neutral position To page 6 88 5 vV OO00000000 0000000000 OOO000000R0000000000 A18 p oN O00000 00 0000000000 R000 00000 O00000 000 0000000000 00000000 be O0000000 OOCOO0000 cont d 6 87 idie Control System Troubleshooting Flow Chart A T Shift Position Signal cont d From page 6 87 Repair open in LT GRN wire between ECU B7 and com bination meter Repair open in GRN wire bet ween2. the combination meter and shift position console switch _ al B7 EEE V OOCOCOCOCOCO FOOCCGOCOCOO BO0C000000 FOOOOCOCCON BOCOCOCOCOOOCOCO BOCo00eeo A18 a Is voltage below 1V NO YES Measure voltage between B7 terminal and A18 termi nal in Park position Repair open in GRN WHT wire between combination meter and shift position con sole switch B7 y Q00000000 0000000000 oOo0o000000 OOCOOCOOCOGFOoCoodC0OO goo000000 A18 ts voltage below 1V NO YES Measure voltage between B7 terminal and A18 terminal ex cept in Park and Neutral lt Is there approx 5V YES A T shift position signal is OK Repair short in LT GRN wire bet ween ECU B7 and combination meter 6 88
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