Conditions for Clearing the MIL/DTC
- 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 P0131
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Powertrain Control Module (PCM) 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 in Vehicle DTC Information |
| 2 |
|
300-600 mV | Go to Step 3 | Go to Step 4 |
| 3 |
|
- | Go to Step 4 | Go to Intermittent Conditions |
| 4 |
|
75-115 mV | Go to Step 5 | Go to Step 6 |
| 5 | Test the HO2S 1 high signal circuit for a short to the HO2S 1 heater low control circuit. Refer to Circuit Testing
, Wiring Repairs
, and Heated Oxygen Sensor (HO2S) Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 13 | Go to Step 10 |
| 6 | Is the voltage less than the specified value? | 75 mV | Go to Step 7 | Go to Step 8 |
| 7 | Test the HO2S 1 high signal circuit for a short to ground or a short to the HO2S 1 low signal circuit. Refer to Circuit Testing
, Wiring Repairs
, and Heated Oxygen Sensor (HO2S) Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 13 | Go to Step 10 |
| 8 | Inspect for the following conditions that may affect the HO2S operation:
NOTE:
Refer to Silicon Contamination of Heated Oxygen Sensors Notice
in Cautions and Notices.
NOTE:
Refer to Heated Oxygen and Oxygen Sensor Notice
in Cautions and Notices.
Did you find and correct the condition? |
- | Go to Step 13 | Go to Step 9 |
| 9 | Test for shorted terminals and poor connections at the HO2S 1. Refer to Testing for Intermittent Conditions and Poor Connections
, Connector Repairs
, and Heated Oxygen Sensor (HO2S) Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 13 | Go to Step 11 |
| 10 | Test for shorted terminals and poor connections at the powertrain control module (PCM). 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 13 | Go to Step 12 |
| 11 |
NOTE:
Refer to Heated Oxygen Sensor (HO2S) Resistance Learn Reset Notice
in Cautions and Notices. Replace the HO2S 1. Refer to Heated Oxygen Sensor Replacement - Position 1
.Did you complete the replacement? |
- | Go to Step 13 | - |
| 12 | Replace the PCM. Refer to Control Module References
in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? |
- | Go to Step 13 | - |
| 13 |
|
- | 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 in Vehicle DTC Information | System OK |