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P0890-SWITCHED BATTERY (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 PRESSURE SWITCH SENSE CIRCUITS SHORT TO VOLTAGE TRANSMISSION SOLENOID/TRS ASSEMBLY 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 (Transmission 9 limp-in 9 mode. The relay output is fed back to the PCM through pins C4–19, C4–28 and C4–38 and are referred to as 9 Transmission Control Relay Output 9 . Immediately after a controller reset (ignition key turned to the 9 run 9 position or after cranking engine), the TCM ver- ifies that the relay contacts are open by checking for no voltage at the transmission control relay output terminals. Diagnostic Test 1. CHECK TO SEE IF DTC P0890 IS PRESENT With the scan tool, Check the STARTS SINCE SET counter for P0890. NOTE: This counter only applies to the last DTC set. Is the ( Starts Since Set ( counter set at 0? Yes >> Go To 2 No >> Go To 4 21 - 472 AUTOMATIC TRANSMISSION - 545RFE - ELECTRICAL DIAGNOSTICS DR/DH |