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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1166 (Engine Controls Diagnosis - 3.6L (Ly7) (DTC P1845 To DTC P2196)) >> Diagnostic Trouble Codes >> DTC P2088, P2090, P2092, or P2094 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Buick Rendezvous. 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. 2:  This step determines if the condition exists. The engine speed must be increased to enable the CMP actuator solenoids. The DTC will not set unless the solenoid is commanded ON and OFF at least once during the ignition cycle.
  2. 5:  This step verifies that the ECM is providing a ground to the CMP actuator solenoid.
DTC P2088, P2090, P2092, or P2094

Step Action Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference:  Engine Control Module (ECM) Connector End Views  or  Engine Controls Connector End Views 
1 Did you perform the Diagnostic System Check-Engine Controls? Go to Step 2  Go to Diagnostic System Check - Engine Controls
2 
  1. Start the engine.
  2. Allow the engine to reach operating temperature.
  3. Increase the engine speed to 2,000 RPM for 10 seconds.
  4. Observe the DTC information with a scan tool.
Does DTC P2088, DTC P2090, DTC P2092, or P2094 fail this ignition?		 Go to Step 4  Go to Step 3 
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.
Did the DTC fail this ignition?		 Go to Step 4  Go to Diagnostic Aids
4
  1. Turn OFF the ignition.
  2. Disconnect the camshaft position (CMP) actuator solenoid. Refer to the appropriate procedure:
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the ignition 1 voltage circuit of the CMP actuator solenoid with a test lamp that is connected to the engine control module (ECM) housing.
Does the test lamp illuminate?		 Go to Step 5  Go to Step 9 
5 
  1. Connect a test lamp between the control circuit of the CMP actuator solenoid and the ignition 1 voltage circuit of the CMP actuator solenoid.
  2. Start the engine.
  3. Command the appropriate CMP actuator solenoid from 0 to 40 and back to 0 degrees with a scan tool.
  4. Exit the CMP Actuator Solenoid Control function.
  5. Turn OFF the ignition.
Does the test lamp turn ON when commanded to 40 degrees and OFF when commanded to 0 degrees?		 Go to Step 7  Go to Step 6 
6 Test the control circuit of the CMP actuator solenoid for a grounded circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 12  Go to Step 8 
7 Test for an intermittent and for a poor connection at the CMP actuator solenoid. 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 12  Go to Step 10 
8 Test for an intermittent and for a poor connection at the ECM. 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 12  Go to Step 11 
9
    IMPORTANT: The ignition 1 voltage circuit supplies voltage to other components. Make sure you test all circuits for a short to ground or test all components for being shorted that share the ignition voltage circuit.
  1. Repair the open or the grounded ignition 1 voltage circuit of the CMP actuator solenoid. Refer to Wiring Repairs in Wiring Systems.
  2. Replace the fuse if necessary.
Did you complete the repair?		 Go to Step 12  -
10 Replace the CMP actuator solenoid. Refer to the appropriate procedure:
Did you complete the replacement?		 Go to Step 12  -
11 Replace the ECM. Refer to Engine Control Module (ECM) Replacement .
Did you complete the replacement?		 Go to Step 12  -
12
  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 13 
13 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 Go to Diagnostic Trouble Code (DTC) List System OK
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