F–74
ON-BOARD DIAGNOSTIC
End Of Sie
DTC P0031
A6E397001084W04
7 VERIFY TROUBLESHOOTING OF DTC P0012
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear DTC from PCM memory using WDS or
equivalent.
• Perform KOER self-test.
(See F–66 KOEO/KOER SELF-TEST.)
• Is same DTC present?
Yes Replace PCM, then go to next step.
(See F–43 PCM REMOVAL/INSTALLATION.)
No Go to next step.
8 VERIFY AFTER REPAIR PROCEDURE
• Perform “After Repair Procedure”.
(See F–66 AFTER REPAIR PROCEDURE.)
• Is there any DTC present?
Yes Go to applicable DTC troubleshooting.
(See F–67 DTC TABLE.)
No Troubleshooting completed.
STEP INSPECTION ACTION
DTC P0031 Front HO2S heater circuit low input
DETECTION
CONDITION
• PCM monitors front HO2S heater control signal at PCM terminal 4A. If PCM turns front HO2S heater off but
front HO2S heater circuit has low voltage, PCM determines that front HO2S heater circuit has malfunction.
Note
• Front HO2S heater is controlled by duty signal.
Diagnostic support note
• This is a continuous monitor (O
2
sensor heater).
• MIL illuminates if PCM detects above malfunction condition in two consecutive drive cycles or in one drive
cycle while DTC for the same malfunction has been stored in PCM.
• PENDING CODE is available if PCM detects above malfunction condition during first drive cycle.
• FREEZE FRAME DATA is available.
• DTC is stored in PCM memory.
POSSIBLE
CAUSE
• Front HO2S malfunction
• Open circuit between ignition switch and front HO2S terminal C
• Open circuit between front HO2S terminal D and PCM terminal 4A
• Short to ground circuit between front HO2S terminal D and PCM terminal 4A
• Poor connection at front HO2S or PCM connector
• PCM malfunction
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