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Home >> Pontiac >> 2007 >> Vibe Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - DTC P2195 To DTC P2A00 >> DTC P2A00 >> Test Description

Test Description

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

  1. 1:  The Diagnostic System Check - Vehicle prompts the technician to complete some basic checks and store the Freeze Frame data on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.
  2. 2:  This step checks whether the malfunction that caused the DTC P2A00 is still present. Operating the vehicle in Check Mode enhances the diagnostic capabilities of the PCM. The HO2S 1 diagnostic can be monitored on the scan tool under the I/M System Information. When the HO2S test displays a YES status, indicating that the heated oxygen sensor system diagnostic is completed, check for a DTC P2A00 in the Last Test Failed screen of the scan tool. If there is no DTC P2A00 displayed the HO2S diagnostic has run and passed, indicating that no malfunction was present this time. The DTCs MUST be cleared in order to view the Current Status of the system diagnostics being performed. Do not forget that the I/M System Information tests only indicate that the test has run, not whether the test passed or failed. The Last Test Failed screen must be checked for related DTCs in order to determine the outcome of the diagnostic test involved.
DTC P2A00

Step Action Values Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference:  Powertrain Control Module Connector End Views  or  Engine Controls Connector End Views 
1  Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 
  1. Perform the scan tool Clear DTC Information function.
  2. Place the vehicle into Check mode, using the scan tool. Refer to Service Bay Test .
  3. Operate the vehicle within the Freeze Frame conditions as specified, or until the heated oxygen sensor (HO2S)/O2S test is complete. Refer to the supporting text.
Did DTC P2A00 set?		 - Go to Step 3  Go to Diagnostic Aids
3
  1. Visually and physically inspect for the following items:
    • The HO2S 1 is securely installed.
    • Any corrosion on terminals
    • The proper terminal tension at the HO2S 1 and at the PCM
    • Any damaged wiring
  2. Repair as necessary.
Was a repair necessary?		 - Go to Step 11  Go to Step 4 
4
  1. Turn OFF the ignition.
  2. Disconnect the HO2S 1 connector.
  3. Measure the resistance of the HO2S 1, between the heater control and the ignition voltage circuits, with a DMM.
Is the resistance of the sensor within the specified range?		 1.2-3.4 Ω at 20°C (68°F) Go to Step 5  Go to Step 9 
5
  1. Turn ON the ignition, with the engine OFF.
  2. Connect a DMM to the HO2S 1 input circuit on the engine harness side and ground.
  3. Measure the HO2S 1 input circuit voltage.
Is the voltage within the specified value?		 3.4-3.5 V Go to Step 6  Go to Step 7 
6
  1. Turn ON the ignition, with the engine OFF.
  2. Connect a DMM to the HO2S 1 low reference circuit on the engine harness side and ground.
  3. Measure the HO2S 1 low reference circuit voltage.
Is the voltage within the specified value?		 2.9-3.1 V Go to Step 9  Go to Step 8 
7
  1. Test for an open or a short in the HO2S 1 input circuit between the HO2S 1 and the powertrain control module (PCM) connector.
  2. Repair as necessary. Refer to Wiring Repairs .
Did you find and correct a condition?		 - Go to Step 11  Go to Step 10 
8
  1. Test for an open or a short in the HO2S 1 low reference circuit between the HO2S 1 and the PCM connector.
  2. Repair as necessary. Refer to Wiring Repairs .
Did you find and correct a condition?		 - Go to Step 11  Go to Step 10 
9 Replace the HO2S 1. Refer to Heated Oxygen Sensor 1 Replacement .
Did you complete the replacement?		 - Go to Step 11  -
10 Replace the PCM. Refer to Control Module References 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. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC or until the HO2S/O2S test is complete.
Did the DTC run and pass?		 - Go to Step 12  Go to Step 2 
12 With a scan tool, observe the stored information, Capture Info.
Does the scan tool display any DTCs that you have not diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
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