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Home >> Saturn >> 2007 >> Ion Red Line >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - DTC P0123 To DTC P0327 >> DTC P0131 >> Test Description

Test Description

The number below refers to the step number on the diagnostic table.

  1. 2:  If the voltage is varying above and below the specified range, the condition is not present.
DTC P0131

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. Start the engine.
  2. Allow the engine to reach operating temperature. Refer to Scan Tool Data List .
  3. Observe the Heated Oxygen Sensor (HO2S) 1 parameter with a scan tool.
Is the HO2S 1 parameter varying above and below the specified range?		 300-600 mV 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 Testing for Intermittent Conditions and Poor Connections
4
  1. Turn OFF the ignition.
  2. Disconnect the HO2S 1.
  3. Turn ON the ignition, with the engine OFF.
  4. Observe the HO2S 1 parameter with a scan tool.
Is the HO2S 1 parameter less than the specified value?		 200 mV Go to Step 6  Go to Step 5 
5
  1. Connect a 3-amp fused jumper wire between the high signal circuit of the HO2S 1 harness connector on the engine harness side and a good ground.
  2. Observe the HO2S 1 parameter with a scan tool.
Is the HO2S 1 parameter less than the specified value?		 100 mV Go to Step 7  Go to Step 8 
6 Test the HO2S 1 high signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 15  Go to Step 9 
7 Test the HO2S 1 low signal circuit for a short to the HO2S 1 heater low control circuit. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 15  Go to Step 10 
8 Test the HO2S 1 high signal circuit for an open or high resistance. 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 HO2S 1 high signal circuit for a short to the following circuits:
  • HO2S 1 low signal circuit
  • HO2S 1 heater low control circuit

Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 15  Go to Step 12 
10
  1. The HO2S 1 may be detecting a lean exhaust condition or may be contaminated. Inspect for the following conditions:
  2. Repair any of the above or similar engine conditions as necessary.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 11 
11 Test for shorted terminals and for poor connections at the HO2S 1. 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 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 15  Go to Step 14 
13
NOTE: Refer to Heated Oxygen Sensor Resistance Learn Reset Notice .
Replace the HO2S 1. Refer to Heated Oxygen Sensor 1 Replacement .Did you complete the replacement?		 - Go to Step 15  -
14 Replace the PCM. 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 In order to ensure that the performance of the catalyst has not been affected by the fault that set this DTC, operate the vehicle within the conditions for running and setting DTC P0420 and verify that P0420 runs and passes. Refer to DTC P0420 .
Does the DTC run and pass?		 - Go to Step 17  Go to DTC P0420
17 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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