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Home >> Cadillac >> 2007 >> CTS Base, 2.8 T, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 2.8L - DTC P0130 To DTC P0341 >> DTC P0132 or P0152 >> Test Description

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 short to voltage condition with the HO2S circuits, the ECM commands open loop for the applicable sensor.
  2. 4:  This step tests for a bias voltage across the reference voltage circuit and the low reference circuit of the HO2S. The bias voltage that you are measuring, is the voltage difference between the reference voltage circuit and the low reference circuit. If the reference voltage circuit or the low reference circuit of the HO2S is shorted to a voltage, the bias voltage will be more than the specified value, which indicates there is a condition with the circuits.
  3. 5:  This step tests for a short to voltage on the input pumping current circuit and the pump current circuit of the HO2S. The input pumping current circuit and the pump current circuit are connected internally within the ECM. If one of the circuits are shorted to voltage, the other circuit will be affected.
  4. 7:  This step isolates if the condition is with the reference voltage circuit or the low reference circuit. If the voltage is less than the specified value, the condition is with low reference circuit.
  5. 11:  This step inspects the harness connector for water intrusion, corrosion, and bent or damaged pins.
  6. 12:  This step inspects the harness connector for water intrusion, corrosion, and bent or damaged pins.
DTC P0132 or P0152

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 
IMPORTANT: DTC P0132 is for bank 1 sensor 1 and DTC P0152 is for bank 2 sensor 1.
  1. Allow the engine to reach operating temperature.
  2. Observe the Loop Status Bn. 1 Sen. 1 or Loop Status Bn. 2 Sen. 1 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 In This Test
4 
  1. Turn OFF the ignition.
  2. Disconnect the appropriate heated oxygen sensor (HO2S).
  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 5  Go to Step 7 
5  Measure the voltage between the input pump current circuit and a good ground with a DMM.
Is the voltage less than the specified value?		 1 V Go to Step 10  Go to Step 6 
6
  1. Turn OFF the ignition.
  2. Disconnect the engine control module (ECM) harness connectors.
  3. Test the input pump current circuit and the pump current circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 15  Go to Step 12 
7  Measure the voltage between the reference voltage circuit of the HO2S and a good ground with a DMM. Refer to Circuit Testing .
Is the voltage more than the specified value?		 3.5 V Go to Step 8  Go to Step 9 
8 Test the reference voltage circuit of the HO2S for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 15  Go to Step 12 
9 Test the low reference circuit of the HO2S for a short to voltage or for a high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 15  Go to Step 12 
10 Test for the following conditions:
Did you find and correct the condition?		 - Go to Step 15  Go to Step 11 
11  Test for shorted terminals and poor connections 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 15  Go to Step 13 
12  Test for shorted terminals and poor connections at the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 15  Go to Step 14 
13 Replace the HO2S. Refer to the appropriate procedure:
Did you complete the replacement?		 - Go to Step 15  -
14 Replace the ECM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 15  -
15
  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 16 
16 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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