Conditions for Clearing the MIL/DTC
WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. 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 P0134
| Step or |
Action | Values | 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 |
|
381-525 mV | Go to Step 3 | Go to Step 4 |
| 3 |
|
- | Go to Step 4 | Go to Intermittent Conditions |
| 4 |
|
475 mV | Go to Step 10 | Go to Step 5 |
| 5 | Measure the voltage between the heated oxygen sensor (HO2S) 1 low signal circuit, on the engine harness side, and a good ground with a DMM. Refer to Circuit Testing
in Wiring Systems. Is the voltage more than the specified value? |
1 V | Go to Step 11 | Go to Step 6 |
| 6 |
|
15 mV | Go to Step 7 | Go to Step 12 |
| 7 |
|
15 mV | Go to Step 8 | Go to Step 13 |
| 8 |
|
5 ohm | Go to Step 14 | Go to Step 9 |
| 9 | Probe the HO2S 1 low signal circuit 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 15 | Go to Step 16 |
| 10 | Test the HO2S 1 high signal circuit for a short to voltage. 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 21 | Go to Step 18 |
| 11 | Test the HO2S 1 low signal circuit for a short to voltage. 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 21 | Go to Step 18 |
| 12 | Test the HO2S 1 high signal circuit for an open or high resistance. 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 21 | Go to Step 18 |
| 13 | Test the HO2S 1 low signal circuit for an open or high resistance. 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 21 | Go to Step 18 |
| 14 | Test the HO2S 1 low 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 21 | Go to Step 18 |
| 15 | Test the HO2S 1 low signal circuit for a short to ground. 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 21 | Go to Step 18 |
| 16 | Inspect for the following 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 21 | Go to Step 17 |
| 17 | Test for an intermittent and for a poor connection 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 21 | Go to Step 19 |
| 18 | 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 21 | Go to Step 20 |
| 19 |
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 21 | - |
| 20 | Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement
. Did you complete the replacement? |
- | Go to Step 21 | - |
| 21 |
|
- | Go to Step 2 | Go to Step 22 |
| 22 | 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 |