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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 637 (Engine Controls Diagnosis - 3.6L (Ly7) (DTC P0008 - DTC P0133)) >> Diagnostic Trouble Codes >> DTC P0010, P0013, P0020, or P0023 >> 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.
  3. 7:  This step determines if there is an internal condition with the ECM. The CMP actuator control circuit is pulled-up to a voltage within the ECM. The ECM uses this voltage as a feedback circuit. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a voltage by monitoring the feedback voltage. If the voltage is not within the specified range, there is a condition with the ECM.
DTC P0010, P0013, P0020, or P0023

Step Action Values 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 the specified value for 10 seconds.
  4. Observe the DTC information with a scan tool.
Did DTC P0010, P0013, P0020, or P0023 fail this ignition?		 2,000 RPM 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 Intermittent Conditions
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 10 
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.
Does the test lamp turn ON when commanded with a scan tool?		 - Go to Step 7  Go to Step 6 
6
  1. Turn OFF the engine.
  2. Test the control circuit of the CMP actuator solenoid for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 13  Go to Step 9 
7 
  1. Turn OFF the engine.
  2. Turn ON the ignition with the engine OFF.
  3. Measure the voltage from the control circuit of the CMP actuator solenoid to the ECM housing with a DMM. Refer to Circuit Testing in Wiring Systems.
Is the voltage within the specified range?		 2.0-3.0 V Go to Step 8  Go to Step 12 
8 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 13  Go to Step 11 
9 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 13  Go to Step 12 
10
  1. Repair the ignition voltage circuit of the CMP actuator solenoid for an open or for an intermittent short to ground. Refer to Wiring Repairs in Wiring Systems.
  2. Replace the fuse if necessary.
Did you complete the repair?		 - Go to Step 13  -
11 Replace the CMP actuator solenoid. Refer to the appropriate procedure:
Did you complete the replacement?		 - Go to Step 13  -
12 Replace the ECM. Refer to Engine Control Module (ECM) Replacement .
Did you complete the replacement?		 - Go to Step 13  -
13
  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 14 
14 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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