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Home >> Saturn >> 2003 >> Ion 1 Standard >> Repair and Diagnosis (Single Page) >> Body & Frame >> Exterior/Interior Trim >> Instrument Panel, Gages, And Console >> Diagnostic Information and Procedures >> DTC P0520: Engine Oil Pressure (EOP) Switch Circuit >> Diagnostic Aids

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.

The test light will illuminate when the vehicle is started, until engine oil pressure is achieved.

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 Instrument Cluster Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Instrument Cluster 
2
  1. Disconnect the engine oil pressure switch.
  2. Connect a test lamp from battery positive voltage to the engine oil pressure (EOP) switch terminal.
  3. Start the engine.
  4. Observe the test light.
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). 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.
Did you complete the replacement?		 Go to Step 8  -
7
IMPORTANT: Program the replacement ECM.
Replace the ECM. Refer to ENGINE CONTROL MODULE in Removal & Installation in Engine Performance.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 
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