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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 P2239 >> 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 P2239 is still present. 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 P2239 in the Last Test Failed screen of the scan tool. If there is no DTC P2239 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.
  3. 5:  If there is a short to ground on the HO2S low reference circuit the scan tool can display HO2S 1 4.99 volts. This is a default value and not the actual sensor input circuit voltage.
  4. 8:  This step tests for a short to ground on the HO2S heater control circuit. A shorted heater control circuit can cause a DTC P2239 to set.
  5. 13:  Operating the vehicle in Check Mode enhances the diagnostic capabilities of the PCM. The catalytic converter diagnostic can be monitored on the scan tool under the I/M System Information selection. When the Catalyst test displays a YES status, indicating that the catalytic converter system diagnostic is completed, check for DTC P0420 in the Last Test Failed screen of the scan tool. If there is no DTC P0420 displayed, the catalytic converter 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 P2239

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. Operate the vehicle within the Freeze Frame conditions as specified, or until the heated oxygen sensor (HO2S)/oxygen sensor (O2S) test is complete. Refer to the supporting text.
Did DTC P2239 set?		 - Go to Step 3  Go to Diagnostic Aids
3
  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 4  Go to Step 10 
4
  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 5  Go to Step 6 
5 
  1. Connect a DMM to the HO2S 1 low reference circuit and ground on the engine harness side.
  2. Turn ON the ignition, with the engine OFF.
  3. Measure the HO2S 1 low reference circuit voltage.
Is the voltage within the specified value?		 2.9-3.1 V Go to Step 10  Go to Step 7 
6
  1. Test for a short to voltage 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 12  Go to Step 8 
7
  1. Test for a short to ground 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 12  Go to Step 8 
8 
  1. Connect a test lamp to B+ and the HO2S 1 heater control circuit at the engine harness side of the HO2S connector.
  2. Turn ON the ignition, with the engine OFF.
Does the test lamp illuminate?		 - Go to Step 9  Go to Step 11 
9
  1. Test for a short to ground in the HO2S 1 heater control 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 12  Go to Step 11 
10 Replace the HO2S 1. Refer to Heated Oxygen Sensor 1 Replacement .
Did you complete the replacement?		 - Go to Step 12  -
11 Replace the PCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 12  -
12
  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 13  Go to Step 2 
13 
  1. In order to ensure that the performance of the catalyst has not been affected by the fault that set this DTC, place the vehicle in Check Mode. Refer to Service Bay Test .
  2. While in check mode, operate the vehicle within the conditions for running and setting DTC P0420 and verify that DTC P0420 runs and passes. Refer to DTC P0420 .
Does DTC P0420 run and pass?		 - Go to Step 14  Go to DTC P0420
14 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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