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Home >> Buick >> 2007 >> Allure CXS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.6L - DTC P2231 To P2626 >> DTC P2243 >> Test Description
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Test Description

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

  1. 2:  This step determines if the condition exists. If there is a condition with the HO2S circuits, the ECM commands Open Loop for the applicable sensor.
  2. 5:  This step tests for a bias voltage across the reference voltage circuit and the low reference circuit of the HO2S. If the reference voltage circuit of the HO2S is open, the bias voltage will be above 1.5 volts, which indicates there is a condition with the circuit.
DTC P2243

Step Action Values Yes No
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine 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. Allow the engine to reach operating temperature.
  2. Observe the Loop Status Sensor 1 parameter with a scan tool.
Does the scan tool display Closed Loop?		 - Go to Step 3  Go to Step 4 
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 Is DTC P0131, P0132, or P2626 also set? - Go to Diagnostic Trouble Code (DTC) List - Vehicle Go to Step 5 
5 
  1. Turn OFF the ignition.
  2. Disconnect the heated oxygen sensor (HO2S) 1.
  3. Turn ON the ignition, with the engine OFF.
  4. Measure the voltage between the reference voltage circuit and the low reference circuit of the HO2S with a DMM.
Is the voltage within the specified range?		 350-550 mV Go to Step 7  Go to Step 6 
6 Test the reference voltage circuit of the HO2S for an open or for a short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 11  Go to Step 8 
7 Test for an intermittent and for a poor connection at the HO2S. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 11  Go to Step 9 
8 Test for an intermittent and for a poor connection at the engine control module (ECM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 11  Go to Step 10 
9 Replace the HO2S. Refer to Heated Oxygen Sensor 1 Replacement .
Did you complete the replacement?		 - Go to Step 11  -
10 Replace the ECM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 11  -
11
  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 12 
12 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
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