DTC P0032 [LF, L3]

id0102008021a3

DTC P0032

Front HO2S heater circuit high input

DETECTION CONDITION

• The PCM monitors front HO2S heater control signal at PCM terminal 4A. If the PCM turns the front HO2S heater on but the front HO2S heater circuit has high voltage, the PCM determines that the front HO2S heater circuit has a malfunction.
Note
• The front HO2S heater is controlled by a duty signal.
Diagnostic support note
• This is a continuous monitor (HO2S heater).
• The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
• The PENDING CODE is available if the PCM detects the above malfunction condition.
• The FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Short to power circuit between front HO2S terminal D and the PCM terminal 4A
• Front HO2S or the PCM terminal is shorted
• Front HO2S heater malfunction
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
PERFORM DTC CONFIRMATION PROCEDURE
• Perform the DTC CONFIRMATION PROCEDURE.
• Is the same DTC present?
Yes
Go to the next step.
No
Intermittent concern exists. Go to the INTERMITTENT CONCERN TROUBLESHOOTING procedure.
2
INSPECT FRONT HO2S TERMINALS
• Turn the ignition switch to the OFF position.
• Disconnect the front HO2S connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 6.
No
Go to the next step.
3
INSPECT FRONT HO2S HEATER
• Inspect the front HO2S heater.
• Is front HO2S heater normal?
Yes
Go to the next step.
No
Replace the front HO2S, then go to Step 6.
4
INSPECT PCM TERMINAL
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Are any malfunctions?
Yes
Repair the terminal, then go to Step 6.
No
Go to the next step.
5
INSPECT FRONT HO2S HEATER CONTROL CIRCUIT FOR SHORT TO POWER CIRCUIT
• Turn the ignition switch to the ON position (Engine off).
• Measure the voltage between front HO2S terminal D (harness-side) and body ground.
• Is the voltage B+?
Yes
Repair or replace the wiring harness for a short to power circuit, then go to the next step.
No
Go to the next step.
6
VERIFY TROUBLESHOOTING OF DTC P0032 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Perform the "KOEO/KOER self-test.
• Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
7
VERIFY AFTER REPAIR PROCEDURE
• Perform the "After Repair Procedure".
• Are any DTCs present?
Yes
Go to the applicable DTC troubleshooting.
No
Troubleshooting completed.