Conditions for Clearing the MIL/DTC
WARNING: This page is about a different variant/trim than selected.
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.
DTC P1138 or P1158
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Controls Connector End Views or Engine Control Module 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 |
|
- | Go to Step 4 | Go to Step 3 |
| 3 |
|
- | Go to Step 4 | Go to Intermittent Conditions |
| 4 |
|
475 mV | Go to Step 7 | Go to Step 5 |
| 5 |
|
25 mV | Go to Step 6 | Go to Step 8 |
| 6 |
|
25 mV | Go to Step 12 | Go to Step 9 |
| 7 | Measure the voltage from the HO2S low signal circuit, on the engine harness side connector, to a good ground with a DMM. Refer to Circuit Testing
in Wiring Systems. Is the voltage more than the specified value? |
50 mV | Go to Step 10 | Go to Step 11 |
| 8 | Test the HO2S high signal circuit for an open or high resistance. Refer to Circuit Testing
, Wiring Repairs
, and Heated Oxygen Sensor Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 17 | Go to Step 14 |
| 9 | Test the HO2S low signal circuit for an open or high resistance. Refer to Circuit Testing
, Wiring Repairs
, and Heated Oxygen Sensor Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 17 | Go to Step 14 |
| 10 | Test the HO2S low signal circuit for a short to voltage. Refer to Circuit Testing
, Wiring Repairs
, and Heated Oxygen Sensor Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 17 | Go to Step 14 |
| 11 | Test the HO2S high signal circuit for a short to voltage or a short to the heater low control circuit. Refer to Circuit Testing
, Wiring Repairs
, and Heated Oxygen Sensor Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 17 | Go to Step 14 |
| 12 | The HO2S is detecting a rich exhaust condition or may be contaminated. Inspect for one of the following conditions:
Repair any of the above or similar engine conditions, as necessary. Did you find and correct the condition? |
- | Go to Step 17 | Go to Step 13 |
| 13 | Test for shorted terminals and poor connections at the HO2S. Refer to Testing for Intermittent Conditions and Poor Connections
, Connector Repairs
, and Heated Oxygen Sensor Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 17 | Go to Step 15 |
| 14 | Test for shorted terminals and poor connections at the engine control module (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 17 | Go to Step 16 |
| 15 | Replace the affected HO2S. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2
or Heated Oxygen Sensor Replacement - Bank 2 Sensor 2
. Did you complete the replacement? |
- | Go to Step 17 | - |
| 16 | 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 17 | - |
| 17 |
|
- | Go to Step 2 | Go to Step 18 |
| 18 | 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 |