DTC P0038 [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7*# 307683-, JM8 LW28J**# 301514-, JM8 LW28A**# 301514- (Assumed))

BME010200001W04

DTC P0038

HO2S heater (Rear, RH) circuit high

DETECTION CONDITION

• The PCM monitors the HO2S heater (Rear, RH) control signal at PCM terminal 57. If the PCM turns the HO2S heater (Rear, RH) on but HO2S heater (Rear, RH) circuit has high voltage, the PCM determines that the HO2S heater (Rear, RH) circuit has malfunction.
Diagnostic support note
• This is an intermittent 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.
• PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
• FREEZE FRAME DATA is available.
• DTC is stored in PCM memory.

POSSIBLE CAUSE

• Short to power circuit between HO2S (Rear, RH) terminal D and PCM terminal 57
• Shorts HO2S (Rear, RH) or PCM terminal
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED
• Have FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (HO2S heater related) been recorded?
Yes
Go to the next step.
No
Record FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on repair order, then go to the next step.
2
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Check for related Service Information availability.
• Is any related Service Information available?
Yes
Perform repair or diagnosis according to available Service Information.
• If vehicle is not repaired, go to next step.
No
Go to next step.
3
INSPECT HO2S (REAR, RH) TERMINAL
• Turn the ignition switch off.
• Disconnect HO2S (Rear, RH) connector.
• Check for bent terminals
• Is there any malfunction?
Yes
Repair or replace terminal, then go to Step 7.
No
Go to next step.
4
INSPECT HO2S HEATER (REAR, RH)
• Inspect HO2S heater (rear, RH).
• Is HO2S heater (rear, RH) normal?
Yes
Go to next step.
No
Replace the HO2S (rear, RH), then go to Step 7.
5
INSPECT PCM TERMINAL
• Disconnect PCM connector.
• Check for bent terminals.
• Is there any malfunctions?
Yes
Repair terminal, then go to Step 7.
No
Go to next step.
6
INSPECT HO2S HEATER (REAR, RH) CONTROL CIRCUIT FOR SHORT TO POWER
• Turn the ignition switch to ON (Engine OFF).
• Measure voltage between HO2S (Rear, RH) terminal D (harness-side) and body ground.
• Is there voltage B+?
Yes
Repair or replace harness for shot to power circuit, then go to next step.
No
Go to next step.
7
VERIFY TROUBLESHOOTING OF DTC P0038 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from PCM memory using WDS
or equivalent.
• Start engine and warm it up completely.
• Is PENDING CODE of same DTC present?
Yes
Replace PCM, then go to next step.
No
Go to next step.
8
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to applicable DTC inspection.
No
Troubleshooting completed.