DTC P0523. Saab 9-7x 2007

For 1990-2009 cars only

Makes 🢒 Saab 🢒 2007 🢒 9-7x 🢒 Driver Information and Entertainment 🢒 Displays and Gages 🢒 DTC P0523

DTC Descriptor

DTC P0523: Engine Oil Pressure (EOP) Sensor Circuit High Voltage.

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Engine Oil Pressure 5-Volt Reference Circuit	P0522	P0522	P0523	P0521
Engine Oil Pressure Sensor Signal Circuit	P0522	P0523	P0523	P0521
Low Reference	--	P0523	--	P0521

The engine oil pressure (EOP) sensor changes resistance based on engine oil pressure. The engine control module (ECM) monitors the signal circuit of the EOP sensor. When the oil pressure is high, the sensor resistance is high, and the ECM senses a high signal voltage. When the oil pressure is low, the sensor resistance is low, and the ECM senses a low signal voltage. The ECM sends the engine oil pressure information to the instrument panel cluster (IPC) via the class 2 serial data circuit.

Conditions for Running the DTC

•	The engine is running.

•	DTC P1635 is not present.

Conditions for Setting the DTC

•	The ECM detects that the EOP sensor signal circuit is greater than 4.6 volts.

•	The above condition is present for greater than 9 seconds.

Action Taken When the DTC Sets

The ECM records the operating conditions at the time that the diagnostic test fails. The ECM displays this information in the Failure Records on the scan tool.

Conditions for Clearing the DTC

•	The DTC becomes history when the conditions for setting the DTC are no longer present.

•	The history DTC is cleared after 40 malfunction-free warm-up cycles.

•	The ECM receives the clear code command from the scan tool.

Reference Information

Schematic Reference

•	Instrument Cluster Schematics

•	Engine Controls Schematics

Connector End View Reference

•	Displays and Gages Connector End Views

•	Engine Control Module Connector End Views

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Scan Tool Reference

Scan Tool Data List

Circuit/System Testing

Ignition OFF, disconnect the harness connector at the EOP sensor.
Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit and ground.

⇒	If greater than 1 ohm, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.

Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit and ground.

⇒	If less than 4.8 volts, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the ECM.

⇒	If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.

Install a 3-amp fused jumper wire between the signal circuit and the low reference circuit. Verify the scan tool Engine Oil Pressure Sensor parameter is less than 0.4 volt.

⇒	If greater than 0.4 volt, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.

If all circuits test normal, test or replace the EOP sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Engine Oil Pressure Sensor and/or Switch Replacement

•	Control Module References for the ECM replacement, setup, and programming