Test Description
WARNING: This page is about a different variant/trim than selected.
The number below refers to the step number on the diagnostic table.
- 9: With no fault present, the test lamp will blink once per second.
DTC P0135, P0141, P0155, or P0161
| 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 - Vehicle? | - | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 |
IMPORTANT:
Whenever the heated oxygen sensor (HO2S) heaters are commanded ON with a scan tool, they will continue to be pulsed ON once per second until the ignition is turned OFF for 30 seconds.
|
0.25-3.125 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 Testing for Intermittent Conditions and Poor Connections |
| 5 |
|
- | Go to Step 6 | Go to Testing for Intermittent Conditions and Poor Connections |
| 6 | Inspect the O2A or O2B fuse. Is the O2A or O2B 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
. 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 |
IMPORTANT:
The test lamp may blink prior to commanding the heaters ON. This is because the heaters were commanded ON in a previous step. To command the heaters OFF, turn OFF the ignition for 30 seconds.
|
- | Go to Step 11 | Go to Step 12 |
| 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
.Is any sensor shorted to ground? |
- | Go to Step 20 | Go to Testing for Intermittent Conditions and Poor Connections |
| 11 | Measure the resistance of the following circuits with a DMM:
Refer to Circuit Testing . Is the resistance of either circuit more than the specified value? |
3 ohm | Go to Step 18 | Go to Step 16 |
| 12 | Is the test lamp on steady? | - | Go to Step 13 | Go to Step 14 |
| 13 | Test the HO2S 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 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
. 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 or high resistance. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
- | Go to Step 22 | Go to Step 17 |
| 16 | Test for shorted terminals and for poor connections at the HO2S. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
- | Go to Step 22 | Go to Step 20 |
| 17 | Test for shorted terminals and for 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 22 | Go to Step 21 |
| 18 | Repair the circuit with high resistance. Refer to Wiring Repairs
. Did you complete the repair? |
- | Go to Step 22 | - |
| 19 | Repair the open or high resistance in the ignition 1 voltage circuit. Refer to Wiring Repairs
. Did you complete the repair? |
- | Go to Step 22 | - |
| 20 | Replace the affected HO2S. Refer to the appropriate procedure:
Did you complete the replacement? |
- | Go to Step 22 | - |
| 21 | Replace the PCM. Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
- | Go to Step 22 | - |
| 22 | Were you sent to this diagnostic from DTC P0134 or P0154? | - | Go to Step 17 in DTC P0134 or P0154 | Go to Step 23 |
| 23 | Were you sent to this diagnostic from DTC P0140 or P0160? | - | Go to Step 17 in DTC P0140 or P0160 | 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 - Vehicle | System OK |