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• When Monitored: • Set Condition: Possible Causes (F856) 5-VOLT SUPPLY CIRCUIT OPEN LINE PRESSURE SENSOR CONNECTION (T118) PRESSURE CONTROL SOLENOID CONTROL CIRCUIT OPEN (F856) 5-VOLT SUPPLY CIRCUIT SHORT TO GROUND (T118) PRESSURE CONTROL SOLENOID CONTROL CIRCUIT SHORT TO GROUND TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT LINE PRESSURE SENSOR STUCK OR STICKING MAIN REGULATOR VALVE POWERTRAIN CONTROL MODULE Always perform the 42RLE Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - Theory of Operation Line pressure is measured by the Line Pressure Sensor (LPS) and regulation is achieved by changing the duty The Transmission Control System calculates torque input to the transmission and uses it as the primary input to the Diagnostic Test 1. CHECK FOR RELATED DTC’S With the scan tool, check for other Transmission DTC’s Are there any line pressure sensor or transmission relay output DTCs present also? Yes >> Refer to the Transmission category and perform the appropriate symptom. No >> Go To 2 2. CHECK IF THE DTC IS CURRENT With the scan tool, check the STARTS SINCE SET counter for P0869. Is the STARTS SINCE SET COUNTER 2 or less? Yes >> Go To 3 No >> Go To 9 21 - 156 AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS KJ |