Mazda 6. Manual - part 154
F–138
ON-BOARD DIAGNOSTIC
End Of Sie
DTC P0443
A6E397001086W03
7
VERIFY TROUBLESHOOTING OF DTC P0420
OR P0431 COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Turn ignition key to ON (Engine OFF).
• Clear DTC from memory using WDS or
equivalent.
• Run PCM adaptive memory procedure drive
mode and HO2S heater, HO2S, and EGR
system repair verification drive mode.
(See
• Is PENDING CODE the same as DTC
present?
Yes Replace PCM, then go to next step.
(See
No
Go to next step.
8
VERIFY AFTER REPAIR PROCEDURE
• Perform “After Repair Procedure”.
• Is there any DTC present?
Yes Go to applicable DTC troubleshooting.
(See
.)
No
Troubleshooting completed.
STEP
INSPECTION
ACTION
DTC P0443
Evaporative emission control system purge control valve circuit malfunction
DETECTION
CONDITION
• PCM monitors input voltages from purge solenoid valve. If voltage at PCM terminal 4U remains low or high,
PCM determines that purge solenoid valve circuit has malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• MIL illuminates if 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 PCM detects the above malfunction condition.
• FREEZE FRAME DATA is available.
• DTC is stored in the PCM memory.
POSSIBLE
CAUSE
• Purge solenoid valve malfunction
• Connector or terminal malfunction
• Short to ground in wiring between purge solenoid valve terminal A and PCM terminal 4U
• Open circuit in wiring between main relay and purge solenoid valve terminal B
• Open circuit in wiring between purge solenoid valve terminal A and PCM terminal 4U
• Short to power circuit between purge solenoid valve terminal A and PCM terminal 4U
• PCM malfunction