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Test Description

WARNING: This page is about a different car, the 2006 Saturn Ion 3 and 2006 Saturn Ion 2. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 2:  If the voltage is more than the specified value, the condition is present.
DTC P0138

Step Action Values Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference: Engine Controls Connector End Views or Engine Control Module (ECM) Connector End Views
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2 
  1. Start the engine.
  2. Allow the engine to reach operating temperature. Refer to Scan Tool Data List .
  3. Operate the engine at 1,500 RPM for 30 seconds.
  4. Observe the HO2S 2 voltage parameter with a scan tool.
Is the HO2S 2 voltage parameter more than the specified value?		 1,065 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 Testing for Intermittent Conditions and Poor Connections in Wiring Systems
4
  1. Turn OFF the ignition.
  2. Disconnect the heated oxygen sensor (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 within the specified range?		 400-500 mV Go to Step 5  Go to Step 6 
5
  1. Connect a 3-amp fused jumper wire between the high signal circuit of the HO2S 2 harness connector on the vehicle harness side and the low signal circuit of the HO2S 2 harness connector on the vehicle harness side.
  2. 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 8  Go to Step 7 
6
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 in Wiring Systems.Did you find and correct the condition?		 - Go to Step 15  Go to Step 14 
7 Is the HO2S 2 voltage parameter less than the specified value? 10 mV Go to Step 10  Go to Step 8 
8
IMPORTANT: The engine control module (ECM) may be damaged if the heated oxygen sensor (HO2S) low signal circuit is shorted to a voltage source.
Test the HO2S 2 low signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.Did you find and correct the condition?		 - Go to Step 15  Go to Step 9 
9 Test the HO2S 2 low circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 12 
10
  1. The HO2S 2 may be detecting a rich 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 the for an intermittent and for a poor connection at the HO2S 2. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 13 
12 Test for an intermittent and for a poor connection at the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 14 
13 Replace the HO2S 2. Refer to Heated Oxygen Sensor Replacement - Position 2 .
Did you complete the replacement?		 - Go to Step 15  -
14 Replace the ECM. Refer to Control Module References in Computer/Integrating Systems 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 in Vehicle DTC Information System OK
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