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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1164 (Engine Controls Diagnosis - 3.6L (Ly7) (DTC P0008 - DTC P0133)) >> Diagnostic Trouble Codes >> DTC P0032 or P0038 >> 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. 4:  The engine must be running for the ECM to operate the control circuit.
  2. 6:  Inspect the HO2S connector for water intrusion, corrosion, and bent or damaged terminals.
  3. 7:  Inspect the HO2S connector for water intrusion, corrosion, and bent or damaged terminals.
DTC P0032 or DTC P0038 - HO2S Heater Control Circuit High Voltage

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 idle for at least 30 seconds.
  3. Observe the DTC information with a scan tool.
Does DTC P0032 or DTC P0038 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. IMPORTANT: The ignition must be OFF when disconnecting or connecting the heated oxygen sensor (HO2S) electrical connector.
  2. Disconnect the appropriate HO2S.
  3. Connect a test lamp between the heater control circuit of the HO2S and the ignition 1 voltage circuit of the HO2S.
  4. Start the engine.
Does the test lamp illuminate?		 Go to Step 6  Go to Step 5 
5
  1. Turn OFF the ignition.
  2. Disconnect the engine control module (ECM).
  3. Test the heater control circuit between the HO2S and the ECM 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 10  Go to Step 7 
6  Test for shorted terminals and poor connections at the HO2S. 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 10  Go to Step 8 
7  Test for shorted terminals and poor connections 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 10  Go to Step 9 
8 Replace the HO2S. Refer to the appropriate procedure:
Did you complete the replacement?		 Go to Step 10  -
9 Replace the ECM. Refer to Engine Control Module (ECM) Replacement .
Did you complete the replacement?		 Go to Step 10  -
10
  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 11 
11 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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