Conditions for Clearing the MIL/DTC
WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. 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 P0036
| 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 |
| 2 |
|
- | Go to Step 5 | Go to Step 3 |
| 3 |
|
- | Go to Step 5 | Go to Step 4 |
| 4 |
|
- | Go to Step 5 | Go to Testing for Intermittent Conditions and Poor Connections |
| 5 | Inspect the fuse that powers the heated oxygen sensor (HO2S) for an open. Is the fuse open? |
- | Go to Step 6 | Go to Step 7 |
| 6 | Test the HO2S ignition 1 voltage circuit for a short to ground. Refer to the following: Did you find and correct the condition? |
- | Go to Step 20 | Go to Step 14 |
| 7 |
IMPORTANT:
Use a known good ground. DO NOT use the HO2S heater low control circuit or the HO2S low signal circuit.
|
- | Go to Step 8 | Go to Step 17 |
| 8 | Connect a test lamp between the HO2S ignition 1 voltage circuit and the HO2S heater low control circuit, on the engine harness side. Does the test lamp illuminate? |
- | Go to Step 11 | Go to Step 9 |
| 9 | Start the engine. Does the test lamp illuminate? |
- | Go to Step 15 | Go to Step 10 |
| 10 |
|
1 V | Go to Step 12 | Go to Step 13 |
| 11 | Test the HO2S heater low control circuit for a short to ground. Refer to the following: Did you find and correct the condition? |
- | Go to Step 20 | Go to Step 16 |
| 12 | Test the HO2S heater low control circuit for a short to voltage. Refer to the following: Did you find and correct the condition? |
- | Go to Step 20 | Go to Step 16 |
| 13 | Test the HO2S heater low control circuit for an open. Refer to the following: Did you find and correct the condition? |
- | Go to Step 20 | Go to Step 16 |
| 14 |
IMPORTANT:
Perform the following test on the HO2S that is supplied voltage by the suspect circuit. Test the HO2S ignition 1 voltage circuit, on the sensor side of the HO2S connector, for a short to ground. Refer to Circuit Testing
.Is the sensor shorted to ground? |
- | Go to Step 18 | Go to Testing for Intermittent Conditions and Poor Connections |
| 15 | Test for shorted terminals and poor connections at the HO2S. Refer to the following:
Did you find and correct the condition? |
- | Go to Step 20 | Go to Step 18 |
| 16 | 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
. Did you find and correct the condition? |
- | Go to Step 20 | Go to Step 19 |
| 17 | Repair the open or high resistance in the HO2S ignition 1 voltage circuit. Refer to Wiring Repairs
and Heated Oxygen Sensor (HO2S) Wiring Repairs
. Did you complete the repair? |
- | Go to Step 20 | - |
| 18 |
NOTE:
Refer to Heated Oxygen Sensor (HO2S) Resistance Learn Reset Notice
. Replace the HO2S. Refer to Heated Oxygen Sensor Replacement - Position 2
.Did you complete the replacement? |
- | Go to Step 20 | - |
| 19 | Replace the PCM. Refer to Control Module References
for replacement, setup and programming. Did you complete the replacement? |
- | Go to Step 20 | - |
| 20 |
|
- | Go to Step 2 | Go to Step 21 |
| 21 | 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 |