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P0850-PARK/NEUTRAL SWITCH PERFORMANCE (CONTINUED) For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS). For a complete wiring diagram Refer to Section 8W. Theory of Operation The Park Neutral switch rationality test is enabled only for vehicles equipped with a 4/5 speed automatic transmis- • When Monitored: • Set Condition: Possible Causes TRS (T41) SENSE (P/N SENSE) CIRCUIT OPEN TRS (T41) SENSE (P/N SENSE) CIRCUIT SHORTED TO GROUND TRANSMISSION RANGE SENSOR PCM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. P/N & D/R NOT IN CORRECT POSITION NOTE: Check the TCM for DTCs, if P0706 is set in the TCM diagnose the TCM code before continuing. With the scan tool, read the Park/Neutral Position Switch input state. While moving the gear selector through all gear positions (Park to 1 and back to Park), monitor the scan tool dis- Did the scan tool display show P/N and D/R in the correct gear positions? Yes >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 2 9 - 760 ENGINE ELECTRICAL DIAGNOSTICS WK |