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• When Monitored: • Set Condition: Possible Causes (K23) APP SENSOR 1 SIGNAL CIRCUIT OPEN (K23) APP SENSOR 1 SIGNAL CIRCUIT SHORT TO GROUND ACCELERATOR PEDAL POSITION SENSOR TRANSMISSION CONTROL MODULE Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS- Theory of Operation The Accelerator Pedal Position Sensor (APPS) is a linear potentiometer. It provides the ECM and the TCM with a Diagnostic Test 1. CHECK IF RELATED ENGINE TPS/APPS DTC’S ARE PRESENT With the scan tool, check Engine DTC’s. Are there any Engine TPS/APPS DTCs present? Yes >> Refer to the Drivability Category and perform the appropriate Symptom. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMIS- No >> Go To 2 2. CHECK TO SEE IF THE DTC IS CURRENT With the scan tool in Transmission Sensors, read the TPS/APPS voltage. Is the TPS/APPS voltage below 0.1 volts? Yes >> Go To 3 No >> Go To 6 3. ACCELERATOR PEDAL POSITION SENSOR Turn the ignition off to the lock position. Disconnect the APP Sensor harness connector. Connect a jumper wire between the (K852) 5-volt Supply circuit and the Ignition on, engine not running. With the scan tool in Transmission Sensors, read the TPS/APPS volt- Is the TPS/APPS voltage above 4.5 volts? Yes >> Replace the Accelerator Pedal Position Sensor per the Ser- vice Information. Perform 45RFE/545RFE TRANSMISSION VERIFICATION 21 - 428 AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS - (DIESEL) KJ |