Conditions for Clearing the MIL/DTC
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. 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 P0135 or P0141
| Step | Action | Value(s) | 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-Engine Controls? | - | Go to Step 2 | Go to Diagnostic System Check - Engine Controls |
| 2 |
|
0.217-2.99 A | Go to Step 3 | Go to Step 6 |
| 3 | Observe the Freeze Frame/Failure Records for this DTC. Did the DTC fail with an engine run time of less than 10 seconds? |
- | Go to Step 4 | Go to Step 5 |
| 4 |
|
- | Go to Step 6 | Go to Intermittent Conditions |
| 5 |
|
- | Go to Step 6 | Go to Intermittent Conditions |
| 6 | Inspect the O2 fuse. Is the O2 fuse open? |
- | Go to Step 7 | Go to Step 8 |
| 7 | Test the ignition 1 voltage circuit for a short to ground. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 22 | Go to Step 10 |
| 8 |
|
- | Go to Step 9 | Go to Step 19 |
| 9 |
|
- | Go to Step 13 | Go to Step 11 |
| 10 |
IMPORTANT:
Perform the following test on all HO2S which are supplied voltage by the suspect circuit. Test the ignition 1 voltage circuit on the sensor side of the HO2S connector for a short to ground. Refer to Circuit Testing
in Wiring Systems.Is any sensor shorted to ground? |
- | Go to Step 20 | Go to Intermittent Conditions |
| 11 | Start the engine with the test lamp still connected from the previous step. Is the test lamp on steady or blinking? |
- | Go to Step 12 | Go to Step 14 |
| 12 | Measure the resistance of the following circuits with a DMM:
Refer to Circuit Testing in Wiring Systems. Is the resistance of either circuit more than the specified value? |
3 ohm | Go to Step 18 | Go to Step 16 |
| 13 | Test the HO2S heater low control circuit for a short to ground. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 22 | Go to Step 17 |
| 14 | Test the HO2S heater low control 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 22 | Go to Step 15 |
| 15 | Test the HO2S heater low control circuit for an open. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 22 | Go to Step 17 |
| 16 | Test for an intermittent and for a poor connection at the HO2S. 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 22 | Go to Step 20 |
| 17 | Test for an intermittent and for a poor connection 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 22 | Go to Step 21 |
| 18 | Repair the circuit with high resistance. Refer to Wiring Repairs
in Wiring Systems. Did you complete the repair? |
- | Go to Step 22 | - |
| 19 | Repair the open in the ignition 1 voltage circuit. Refer to Wiring Repairs
in Wiring Systems. Did you complete the repair? |
- | Go to Step 22 | - |
| 20 |
NOTE:
Refer to Heated Oxygen Sensor (HO2S) Resistance Learn Reset Notice
in Cautions and Notices. Replace the affected HO2S. Refer to Heated Oxygen Sensor Replacement - Position 1
or Heated Oxygen Sensor Replacement - Position 2
.Did you complete the replacement? |
- | Go to Step 22 | - |
| 21 | Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement
. Did you complete the replacement? |
- | Go to Step 22 | - |
| 22 | Were you sent to this diagnostic from DTC P0134? | - | Go to Step 18 in DTC P0134 | Go to Step 23 |
| 23 | Were you sent to this diagnostic from DTC P0140? | - | Go to Step 18 in DTC P0140 | Go to Step 24 |
| 24 |
|
- | Go to Step 2 | Go to Step 25 |
| 25 | 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 |