P0523-ENGINE OIL PRESSURE SENSOR CIRCUIT HIGHFor a complete wiring diagram Refer to Section 8WWhen Monitored:At engine start-up.Set Condition:The ECM detects that the (G6) Oil Pressure Sensor Signal circuit is above 4.6 volts for 0.5 second.
Possible CausesINTERMITTENT DTC(K357) OIL PRESSURE SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE(G6) OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE(K936) OIL PRESSURE SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE(G6) OIL PRESSURE SENSOR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE(K936) OIL PRESSURE SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCEOIL PRESSURE SENSORENGINE CONTROL MODULE (ECM)
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)Diagnostic Test1.DTC IS ACTIVEIf any Sensor Reference or Sensor Supply voltage DTCs are present, perform the applicable diagnostic procedure before continuing with this test.Ignition on, engine not running.With the scan tool, Clear DTCs in the Engine Control Module (ECM).Monitor the scan tool for at least two minutes.Cycle the ignition key off and on several times, leaving the ignition on for at least 10 seconds at a time.Start the engine.Allow the engine to reach normal operating temperature.With the scan tool, select View DTCs.Is the status Active for this DTC?YesGo To 2NoRefer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.(Refer to 9 - ENGINE - DIAGNOSIS
AND TESTING)2.(K357) OIL PRESSURE SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGETurn the ignition off.Disconnect the Oil Pressure Sensor harness connector.Disconnect the Engine Control Module (ECM) harness connector.Remove the ASD Relay from the TIPM.Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay Connector.Turn the ignition on.Measure the voltage of the (K357) Oil Pressure Sensor 5 Volt Supply circuit in the Oil Pressure Sensor harness connector.Is there any voltage present?YesRepair the (K357) Oil Pressure Sensor 5 Volt Supply circuit for a short to voltage. Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo to 33.(G6) OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGEThe jumper wire should still be in place.Measure the voltage of the (G6) Oil Pressure Sensor Signal circuit in the Oil Pressure Sensor harness connector.Is there any voltage present?YesRepair the (G6) Oil Pressure Sensor Signal circuit for a short to voltage.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo to 44.(K936) OIL PRESSURE SENSOR GROUND CIRCUIT SHORTED TO VOLTAGEThe jumper wire should still be in place.Measure the voltage of the (K936) Oil Pressure Sensor Ground circuit in the Oil Pressure Sensor harness connector.Is there any voltage present?YesRepair the (K936) Oil Pressure Sensor Ground circuit for a short to voltage.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo to 55.OIL PRESSURE SENSORTurn the ignition off.Remove the jumper wire and install the ASD Relay.Connect the Engine Control Module (ECM) harness connector.Connect a jumper wire between the (K936) Oil Pressure Sensor Ground circuit and the (G6) Oil Pressure Sensor Signal circuit in the Oil Pressure Sensor harness connector.Turn the ignition on.With the scan tool, Clear DTCs.With the scan tool, select View DTCs.The scan tool should display an Oil Pressure Sensor low voltage or short to ground DTC with the jumper wire in place.Does the scan tool display the DTC(s) as described above?YesReplace the Oil Pressure Sensor in accordance with the Service Information.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo to 66.(G6) OIL PRESSURE SENSOR SIGNAL OPEN OR HIGH RESISTANCETurn the ignition off.Disconnect the Engine Control Module (ECM) harness connector.Measure the resistance of the (G6) Oil Pressure Sensor Signal between the Oil Pressure Sensor harness connector and the Engine Control Module (ECM) harness connector.Is the resistance below 10.0 ohms?YesGo to 7NoRepair the (G6) Oil Pressure Sensor Signal for an open circuit or high resistance.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)7.(K936) OIL PRESSURE SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCEMeasure the resistance of the (K936) Oil Pressure Sensor Ground circuit between the Oil Pressure Sensor harness connector and the Engine Control Module (ECM) harness connector.Is the resistance below 10.0 ohms?YesGo to 8NoRepair the (K936) Oil Pressure Sensor Ground circuit for an open circuit or high resistance.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)8.ENGINE CONTROL MODULE (ECM)Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Oil Pressure Sensor and the Engine Control Module (ECM).Look for any chafed, pierced, pinched, or partially broken wires.Look for broken, bent, pushed out or corroded terminals.Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.Look for the data to change or for the DTC to reset during the wiggle test.Refer to any Technical Service Bulletins that may apply.Were any problems found?YesRepair as necessary.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoReplace the Engine Control Module (ECM) in accordance with the Service Information.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)