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Test Description

WARNING: This page is about a different car, the 2006 GMC Yukon XL, 2006 Chevrolet Suburban, and 2006 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 5:  This step tests for a short to ground in the MIL control circuit. With the powertrain control module (PCM) disconnected and the ignition ON, the MIL should be OFF.
  2. 6:  This step tests for a short to voltage on the MIL control circuit. With the fuse removed, there should be no voltage on the MIL control circuit.
DTC P0650

Step Action Values Yes No
Schematic Reference: Instrument Cluster Schematics or Engine Controls Schematics
Connector End View Reference: Instrument Panel, Gages, and Console Connector End Views or Powertrain Control Module (PCM) Connector End Views
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 Command the malfunction indicator lamp (MIL) ON and OFF with a scan tool.
Does the MIL turn ON and OFF when commanded with a scan tool?		 - Go to Step 3  Go to Step 4 
3
  1. Observe the Freeze Frame/Failure Records for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Does the DTC fail this ignition?		 - Go to Step 4  Go to Testing for Intermittent Conditions and Poor Connections
4 Is the MIL always ON? - Go to Step 5  Go to Step 6 
5 
  1. Turn OFF the ignition.
  2. Disconnect the powertrain control module (PCM).
  3. Turn ON the ignition.
Is the MIL OFF?		 - Go to Step 11  Go to Step 13 
6 
  1. Turn OFF the ignition.
  2. Disconnect the PCM.
  3. Remove the fuse that supplies voltage to the MIL.
  4. Turn ON the ignition, with the engine OFF.
  5. Measure the voltage from the MIL control circuit in the PCM harness connector to a good ground.
Is the voltage less than the specified value?		 1 V Go to Step 7  Go to Step 14 
7
  1. Turn OFF the ignition.
  2. Install the fuse that supplies voltage to the MIL.
  3. Turn ON the ignition, with the engine OFF.
  4. Connect a 3-amp fused jumper wire between the MIL control circuit of the PCM harness connector and a good ground.
Is the MIL illuminated?		 - Go to Step 11  Go to Step 8 
8
  1. Turn OFF the ignition.
  2. Remove the instrument panel cluster (IPC).
  3. Turn ON the ignition, with the engine OFF.
  4. Probe all ignition and battery positive voltage circuits of the IPC harness connector with a test lamp that is connected to a good ground.
Does the test lamp illuminate for all circuits?		 - Go to Step 9  Go to Step 12 
9 Test the MIL control circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct a condition?		 - Go to Step 17  Go to Step 10 
10 Test for an intermittent and for a poor connection at the IPC. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 17  Go to Step 15 
11 Test for an intermittent and for a poor connection at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 17  Go to Step 16 
12 Repair the open in the ignition voltage or battery positive voltage circuit. Refer to Wiring Repairs .
Did you complete the repair?		 - Go to Step 17  -
13 Repair the short to ground in the MIL control circuit. Refer to Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 17  -
14 Repair the short to voltage in the MIL control circuit. Refer to Wiring Repairs .
Did you complete the repair?		 - Go to Step 17  -
15 Replace the IPC. Refer to Instrument Panel Cluster (IPC) Replacement .
Did you complete the replacement?		 - Go to Step 17  -
16 Replace the PCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 17  -
17
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?		 - Go to Step 2  Go to Step 18 
18 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
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