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Home >> GMC >> 2005 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays, Gauges And Console >> Diagnostic Information and Procedures >> DTC P0523 >> Test Description

Test Description

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

  1. 3:  This step tests for the proper operation of the circuit in the low voltage range.
DTC P0523

Step Action Values Yes No
Schematic Reference: Instrument Cluster Schematics 
Connector End View Reference: Master Electrical Component List
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
  1. Install a scan tool.
  2. Turn the ignition ON, with the engine OFF.
  3. With the scan tool, observe one of the following engine oil pressure parameters:
    • Monitored Oil Pressure parameter in the IPC Data 1 data list-6.6L diesel only.
    • Engine Oil Pressure Sensor parameter in the PCM Engine Data 2 data list.
Does the scan tool indicate that the Engine Oil Pressure parameter is at or greater than the specified value?		 550 kPa (80 psi) - 6.6L diesel only
4.6 V		 Go to Step 3  Go to Diagnostic Aids
3 
  1. Turn the ignition OFF.
  2. Disconnect the engine oil pressure (EOP) sensor.
  3. With the scan tool, observe one of the following engine oil pressure parameters:
    • Monitored Oil Pressure parameter in the IPC Data 1 data list-6.6L diesel only.
    • Engine Oil Pressure Sensor parameter in the PCM Engine Data 2 data list.
Does the scan tool indicate that the Engine Oil Pressure parameter is at or less than the specified value?		 0 kPa (0 psi) - 6.6L diesel only
0.4 V		 Go to Step 4  Go to Step 5 
4
  1. Turn the ignition OFF.
  2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure (Single Battery) or Battery Negative Cable Disconnect/Connect Procedure (Auxiliary Battery) in Engine Electrical.
  3. Measure the resistance from the low reference circuit of the EOP sensor to a good ground.
Is the resistance less than the specified value?		 5 Ω Go to Step 7  Go to Step 6 
5 Test the EOP sensor signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 8 
6
  1. Disconnect the powertrain control module (PCM).
  2. Test the low reference circuit of the EOP sensor for an open or for a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 8 
7 Inspect for poor connections at the harness connector of the EOP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 9 
8 Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 10 
9 Replace the engine oil pressure sensor. Refer to the following procedures:
Did you complete the replacement?		 - Go to Step 11  -
10 Replace the PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 11  -
11
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC.
Does the DTC reset?		 - Go to Step 2  System OK
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