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 P0135
| Step | 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 - Vehicle? | - | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 |
|
0.30-1.45 A | Go to Step 3 | Go to Step 4 |
| 3 |
|
- | Go to Step 4 | Go to Intermittent Conditions |
| 4 |
IMPORTANT:
Use a known good ground. DO NOT use the HO2S 1 heater low control circuit or the HO2S 1 low reference circuit.
|
- | Go to Step 6 | Go to Step 5 |
| 5 | Test the HO2S 1 heater ignition 1 voltage fuse for an open. Refer to Circuit Testing
. Is the fuse open? |
- | Go to Step 10 | Go to Step 15 |
| 6 |
|
- | Go to Step 7 | Go to Step 8 |
| 7 |
|
- | Go to Step 9 | Go to Step 12 |
| 8 |
|
0-5 Ω | Go to Step 13 | Go to Step 14 |
| 9 | Test the HO2S 1 heater low control circuit for a short to ground. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
- | Go to Step 18 | Go to Step 13 |
| 10 | Test the HO2S 1 heater ignition voltage circuit for a short to ground and replace the fuse. Refer to Circuit Testing
andWiring Repairs
. Did you find and correct the condition? |
- | Go to Step 18 | Go to Step 11 |
| 11 | Measure the resistance from the ignition 1 voltage circuit of the sensor side of the HO2S harness connector to each of the following circuits:
Is the resistance less than the specified value? |
5 Ω | Go to Step 16 | Go to Intermittent Conditions |
| 12 | Test for an intermittent and for a poor connection at the harness connector of the HO2S 1. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
- | Go to Step 18 | Go to Step 16 |
| 13 | Test for an intermittent and for a poor connection at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
- | Go to Step 18 | Go to Step 17 |
| 14 | Repair the open or high resistance in the HO2S 1 heater low control circuit. Refer to Wiring Repairs
. Did you complete the repair. |
- | Go to Step 18 | - |
| 15 | Repair the open or high resistance in the HO2S 1 ignition 1 voltage circuit. Refer to Wiring Repairs
. Did you complete the repair. |
- | Go to Step 18 | - |
| 16 | Replace the HO2S 1. Refer to Heated Oxygen Sensor Replacement - Position 1
. Did you complete the replacement? |
- | Go to Step 18 | - |
| 17 | Replace the PCM. Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
- | Go to Step 18 | - |
| 18 |
|
- | Go to Step 2 | Go to Step 19 |
| 19 | 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 |