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P0888-TRANSMISSION RELAY ALWAYS OFF (CONTINUED) For the Transmission circuit diagram (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - For a complete wiring diagram Refer to Section 8W • When Monitored: 9 OFF 9 position to 9 RUN 9 position and/or the ignition is turned from 9 START 9 position to 9 RUN 9 position. • Set Condition: Possible Causes (A104) FUSED B+ CIRCUIT OPEN (T16) TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT OPEN (T16) TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT SHORT TO GROUND (T15) TRANSMISSION CONTROL RELAY CONTROL CIRCUIT OPEN (T15) TRANSMISSION CONTROL RELAY CONTROL CIRCUIT SHORT TO GROUND (Z915) TRANSMISSION CONTROL RELAY GROUND CIRCUIT OPEN TRANSMISSION CONTROL RELAY STUCK OPEN POWERTRAIN CONTROL MODULE Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS- Theory of Operation The transmission control relay is used to supply power to the solenoids and pressure switches when the transmis- 9 Transmission Control Relay Output 9 . This circuit does not supply power to the TCM, it is only a sense circuit. When the relay is off, no power is supplied to the solenoids and pressure switches, and the transmission is in 9 limp-in 9 or 9 default 9 mode. Note: Inadequate Transmission Control Relay Output voltage can also cause DTCs P0846, P0869, P0871, P0876 or P0988 to set. This does not indicate an internal transmission or solenoid/ Diagnostic Test 1. CHECK TO SEE IF DTC P0888 IS CURRENT With the scan tool, Check the STARTS SINCE SET counter for P0888. NOTE: This counter only applies to the last DTC set. Is the STARTS SINCE SET counter equal to 0? Yes >> Go To 2 No >> Go To 9 21 - 588 AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS ND |