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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1870 (Engine Controls And Fuel - 3.5L (L66) - DTC P2227 To DTC P2649) >> DTC P2243 or P2247 >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Saturn Vue. 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 wether a condition currently exists. If the lambda value fluctuates near 1.00 and Loop Status is Closed, the HO2S is operating correctly.
  2. 4:  This step tests for a condition in the reference voltage circuit. Test for an open or a high resistance if the voltage measures less than 0.1 volts.
  3. 5:  This step tests for a condition in the HO2S low reference circuit. If the voltage measured on the HO2S heater control circuit is more than 1 volt, test for a wire to wire short between the low reference circuit and the heater control circuit.
  4. 8:  Inspect the HO2S connector for water intrusion, corrosion, and bent or damaged terminals.
  5. 9:  Inspect the PCM connectors for water intrusion, corrosion, and bent or damaged terminals.
DTC P2243 or P2247

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 
IMPORTANT: DTC P2243 is for bank 1 sensor 1 - rear and DTC P2247 is for bank 2 sensor 1 - front.
  1. Allow the engine to reach operating temperature.
  2. Observe the Loop Status Bank 1 or Loop Status Bank 2 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 
  1. Turn OFF the ignition.
  2. Disconnect the appropriate heated oxygen sensor (HO2S) connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Measure the voltage between the HO2S reference voltage circuit and a good ground with a DMM.
Is the voltage more than the specified value?		 1 V Go to Step 5  Go to Step 6 
5  Measure the voltage between the HO2S heater control circuit and a good ground with a DMM.
Is the voltage more than the specified value?		 1 V Go to Step 7  Go to Step 8 
6 Test the reference voltage circuit of the HO2S for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 12  Go to Step 9 
7 Test the low reference circuit of the HO2S for a short to the HO2S heater control circuit. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 12  Go to Step 9 
8  Test for shorted terminals and for poor connections at the HO2S sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 12  Go to Step 10 
9  Test for shorted terminals and for poor connections at the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 12  Go to Step 11 
10 Replace the HO2S sensor. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 or Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 .
Did you complete the replacement?		 - Go to Step 12  -
11
  1. Replace the PCM. Refer to Control Module References for replacement, setup, and programming.
  2. Perform the idle learn procedure. Refer to Idle Learn .
Did you complete the replacement?		 - Go to Step 12  -
12
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 90 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 13 
13 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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