Conditions for Clearing the MIL/DTC
WARNING: This page is about a different car, the 2004 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
- 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 P0136
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Controls Connector End Views or Powertrain Control Module (PCM) Connector End Views |
||||
| 1 | Did you perform the Diagnostic System Check-Engine Controls? | - | Go to Step 2 | Go to Diagnostic System Check - Engine Controls |
| 2 |
|
286-703 mV | Go to Step 4 | Go to Step 3 |
| 3 | Observe the HO2S 1 parameter with a scan tool. Is the voltage fluctuating rapidly above and below the specified range? |
286-703 mV | Go to Step 5 | Go to Step 9 |
| 4 |
|
800 mV | Go to Step 4 | Go to Intermittent Conditions |
| 5 |
|
25 mV | Go to Step 8 | Go to Step 6 |
| 6 | Probe the HO2S 2 low signal circuit, on the engine harness side, with a test lamp that is connected to B+. Refer to Probing Electrical Connectors
in Wiring Systems. Does the test lamp illuminate? |
- | Go to Step 7 | Go to Step 12 |
| 7 |
|
5 ohm | Go to Step 13 | Go to Step 10 |
| 8 | Test the HO2S 2 high signal circuit for a short to ground or a short to the HO2S 2 low signal circuit. Refer to Circuit Testing
, Wiring Repairs
, andHeated Oxygen Sensor (HO2S) Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 16 | Go to Step 11 |
| 9 | Test the HO2S low reference circuit for an open or high resistance. Refer toCircuit Testing
, Wiring Repairs
, and Heated Oxygen Sensor (HO2S) Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 16 | Go to Step 11 |
| 10 | Test for an intermittent and for a poor connection at the HO2S 2. 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 16 | Go to Step 14 |
| 11 | Test for shorted terminals and poor connections at the 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 16 | Go to Step 15 |
| 12 | Repair the open or high resistance in the HO2S 2 low signal circuit between the HO2S 2 connector and the splice. Refer to Wiring Repairs
and Heated Oxygen Sensor (HO2S) Wiring Repairs
in Wiring Systems. Did you complete the repair? |
- | Go to Step 16 | - |
| 13 | Repair the open or high resistance in the HO2S 2 low signal circuit between the PCM connector and the splice. Refer to Wiring Repairs
and Heated Oxygen Sensor (HO2S) Wiring Repairs
in Wiring Systems. Did you complete the repair? |
- | Go to Step 16 | - |
| 14 | Replace the HO2S 2. Refer to Heated Oxygen Sensor Replacement - Position 2
. Did you complete the replacement? |
- | Go to Step 16 | - |
| 15 | Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement
. Did you complete the replacement? |
- | Go to Step 16 | - |
| 16 |
|
- | Go to Step 2 | Go to Step 17 |
| 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 | System OK |