Specifications

F78
ON-BOARD DIAGNOSTIC
End Of Sie
DTC P0037
A6E397001084W06
6 VERIFY TROUBLESHOOTING OF DTC P0032
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear DTC from PCM memory using WDS or
equivalent.
• Perform KOEO/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.
7 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 P0037 Rear HO2S heater circuit low input
DETECTION
CONDITION
• PCM monitors rear HO2S heater control signal at PCM terminal 4D. If PCM turns rear HO2S heater off but
rear HO2S heater circuit has low voltage, PCM determines that rear HO2S heater circuit has malfunction.
Diagnostic support note
• This is a continuous monitor (O
2
sensor heater).
• MIL illuminates if PCM detects the 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 the above malfunction condition during first drive cycle.
• FREEZE FRAME DATA is available.
• DTC is stored in PCM memory.
POSSIBLE
CAUSE
• Rear HO2S malfunction
• Open circuit between the ignition switch and rear HO2S terminal C
• Open circuit between the rear HO2S terminal D and PCM terminal 4D
• Short to ground circuit between rear HO2S terminal D and PCM terminal 4D
• Poor connection at rear HO2S or PCM connector
• PCM malfunction