LEMON Manuals: Even more car manuals for everyone
Home >> Saturn >> 2006 >> Vue Red Line, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Controls - 2.2L (L61) - DTC P0700 To DTC P2A01) >> DTC P1138 >> Test Description

Test Description

WARNING: This page is about a different variant/trim than selected.

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

  1. 2:  When the system is operating correctly, the HO2S 2 voltage should toggle above and below the specified values. You may need to operate the vehicle within the Freeze Frame conditions and Conditions for Setting the DTC in order to duplicate the malfunction that was detected by the ECM.
DTC P1138

Step Action Values Yes No
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Control Module (ECM) 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: If any other DTCs are set except for heated oxygen sensor (HO2S) DTCs, refer to the other DTCs first before proceeding with this table.
  1. Operate the engine at normal operating temperature.
  2. Operate the engine above 1,200 RPM for 2 minutes.
  3. Observe the heated oxygen sensor (HO2S) 2 voltage parameter with a scan tool.
Does the scan tool indicate that the HO2S 2 voltage is more than the specified values?		 648 mV Go to Step 4  Go to Step 3 
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 Intermittent Conditions
4
  1. Turn OFF the ignition.
  2. Disconnect the HO2S 2.
  3. Turn ON the ignition, with the engine OFF.
  4. Observe the HO2S 2 voltage parameter with a scan tool.
Is the HO2S 2 voltage parameter more than the specified value?		 800 mV Go to Step 5  Go to Step 6 
5
IMPORTANT: The normal voltage on the high signal circuit is between 400-500 mV.
IMPORTANT: The sensor may be damaged if the circuit is shorted to a voltage source.
Test the HO2S 2 high signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs .Did you find and correct the condition?		 - Go to Step 13  Go to Step 10 
6
  1. Connect a 3-amp fused jumper wire between the high signal circuit of the HO2S 2 harness connector on the engine harness side and the low signal circuit of the HO2S 2 harness connector on the engine harness side.
  2. Observe the HO2S 2 voltage parameter with a scan tool.
Is the HO2S 2 voltage parameter within the specified range?		 400-500 mV Go to Step 7  Go to Step 8 
7
  1. Remove the jumper wire from the previous step.
  2. Test the HO2S 2 low signal circuit for an open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 13  Go to Step 10 
8 The HO2S 2 is detecting a rich condition or may be contaminated. Inspect for the following conditions:
Repair any of the above or similar engine conditions as necessary.
Did you find and correct the condition?		 - Go to Step 13  Go to Step 9 
9 Inspect for poor connections at the harness connector of the HO2S 2. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 13  Go to Step 11 
10 Inspect for poor connections at the harness connector of 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 13  Go to Step 12 
11 Replace the HO2S 2. Refer to Heated Oxygen Sensor Replacement - Position 2 .
Did you complete the replacement?		 - Go to Step 13  -
12 Replace the ECM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 13  -
13
  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 14 
14 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
scientia non olet · About LEMON Manuals