Diagnostic Aids

Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can help determine how many ignition cycles that the diagnostic test reported a pass and/or a fail.
If the DTC is not current, it may be due to an intermittent condition.
Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

DTC P0520

Step	Action	Yes	No
Schematic Reference: Instrument Cluster Schematics
1	Did you perform the Diagnostic System Check - Instrument Cluster?	Go to Step 2	Go to Diagnostic System Check - Instrument Cluster
2	Disconnect the engine oil pressure switch. Connect a test lamp from battery positive voltage to the engine oil pressure (EOP) switch terminal. Start the engine. Observe the test light since the test lamp will illuminate until the EOP is achieved. Does the test light illuminate?	Go to Step 4	Go to Step 3
3	Test the signal circuit of the oil pressure switch for a short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 8	Go to Step 5
4	Inspect for poor connections at the harness connector of the EOP switch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 8	Go to Step 6
5	Inspect for poor connections at the harness connector of the engine control module (ECM)/powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 8	Go to Step 7
6	Replace the EOP switch. Refer to Engine Oil Pressure Sensor and/or Switch Replacement in Engine Mechanical - 2.2L or to Engine Oil Pressure Sensor and/or Switch Replacement in Engine Mechanical - 2.0L (LSJ). Did you complete the replacement?	Go to Step 8	-
7	IMPORTANT: Program the replacement ECM/PCM. Replace the ECM/PCM. Refer to Engine Control Module (ECM) Replacement in Engine Controls - 2.2L (L61) or to Powertrain Control Module (PCM) Replacement in Engine Controls - 2.0L (LSJ).Did you complete the replacement?	Go to Step 8	-
8	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 2