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Home >> Chevrolet >> 2003 >> Impala Police >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel, Gages, And Console >> Diagnostic Information and Procedures >> DTC P1189: Oil Pressure Switch Signal Circuit Is High >> Test Description

Test Description

The number below refers to the step number in the diagnostic table.

  1. 3:  Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.
DTC P1189

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. Connect a scan tool.
  2. Turn the ignition ON, with the engine OFF.
  3. With a scan tool, observe the Engine Oil Pressure Switch parameter in the PCM Engine Data 2 data list.
Does the Engine Oil Pressure Switch parameter display Low?		 Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3 
  1. Turn the ignition OFF.
  2. Disconnect the engine oil pressure switch connector.
  3. Connect a 3 amp fused jumper wire between the signal circuit of the oil pressure switch connector and a good ground.
  4. Turn the ignition ON.
  5. With a scan tool, observe the Engine Oil Pressure Switch parameter in the PCM Engine Data 2 data list.
Does the Engine Oil Pressure Switch parameter display Low?		 Go to Step 6  Go to Step 4 
4 Test the signal circuit of the engine oil pressure switch for an open, high resistance, or a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 10  Go to Step 5 
5 Test the ground circuit of the engine oil pressure switch for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 10  Go to Step 7 
6 Inspect for poor connections at the harness connector of the engine oil pressure 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 10  Go to Step 8 
7 Inspect for poor connections at the harness connector of the 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 10  Go to Step 9 
8 Replace the engine oil pressure switch. Refer to Engine Oil Pressure Sensor and/or Switch Replacement in Engine Mechanical - 3.4L or to Engine Oil Pressure Sensor and/or Switch Replacement in Engine Mechanical 3.8L.
Did you complete the replacement?		 Go to Step 10  -
9
IMPORTANT: Program the replacement PCM.
Replace the PCM. Refer to POWERTRAIN CONTROL MODULEDid you complete the replacement?		 Go to Step 10  -
10
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 Go to Step 2  System OK
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