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P0988-4C PRESSURE SWITCH RATIONALITY (CONTINUED) For the Transmission circuit diagram (Refer to )(Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/ For a complete wiring diagram Refer to Section 8W • When Monitored: • Set Condition: Possible Causes RELATED RELAY DTC’S PRESENT DTC P0871 ALSO PRESENT LOSS OF 12-VOLT FEED (T48) 4C PRESSURE SWITCH SENSE CIRCUIT OPEN (T48) 4C PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND EXCESSIVE FLUID LEAKAGE WITH 2C CLUTCH CIRCUIT #5 AND/OR #7 CHECK BALL CUT OR DAMAGED LOW LINE PRESSURE TRANSMISSION SOLENOID/TRS ASSEMBLY POWERTRAIN CONTROL MODULE WIRING AND CONNECTORS Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS- Theory of Operation The Transmission system uses five pressure switches to monitor the fluid pressure in the LR, 2C, 4C, UD, and OD GEAR L/R 2C 4C UD OD REVERSE OPEN OPEN OPEN OPEN OPEN P/N CLOSED OPEN OPEN OPEN OPEN 1ST CLOSED* OPEN OPEN CLOSED OPEN 2ND OPEN CLOSED OPEN CLOSED OPEN 2ND PRIME OPEN OPEN CLOSED CLOSED OPEN DRIVE OPEN OPEN OPEN CLOSED CLOSED 4TH OPEN OPEN CLOSED OPEN CLOSED 5TH OPEN CLOSED OPEN OPEN CLOSED *L/R is closed if output speed is below 100 rpm in Drive and Manual 2. L/R is open in Manual 1. 21 - 628 AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS ND |