DTC P0647:00 [MZ-CD 1.6]

id0102g8587800

DTC P0647:00

A/C relay circuit high input
DETECTION CONDITION
•  The PCM monitors the A/C relay. If there is a short to the power supply between A/C relay terminal E and PCM terminal 2AM, the PCM determines that there is a malfunction in the A/C relay circuit.
POSSIBLE CAUSE
•  A/C relay connector or terminal malfunction
•  Short to power supply in wiring harness between A/C relay terminal E and PCM terminal 2AM
•  A/C relay malfunction
•  PCM connector or terminal malfunction
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
•   Has the FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
•  Verify related service repair information availability.
•  Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair information.
•   If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
INSPECT A/C RELAY CONNECTOR CONDITION
•  Switch the ignition to off.
•  Disconnect the A/C relay connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion)
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 7.
No
Go to the next step.
4
INSPECT A/C RELAY SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY
•  Disconnect the A/C relay connector.
•  Switch the ignition to ON (engine off)
•  Measure the voltage at the A/C relay terminal E (wiring harness-side).
•  Is there any voltage?
Yes
Repair or replace the wiring harness for a possible short to power supply, then go to Step 7.
No
Go to the next step.
5
INSPECT A/C RELAY
•  Inspect the A/C relay.
•  Is there any malfunction?
Yes
Replace the A/C relay, then go to Step 7.
No
Go to the next step.
6
INSPECT PCM CONNECTOR CONDITION
•  Disconnect the PCM connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion)
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to the next step.
No
Go to the next step.
7
VERIFY THAT DTC P0647:00 TROUBLESHOOTING IS COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Run the vehicle under the FREEZE FRAME DATA stored condition.
•  Is the same DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the PCM.
(See PCM REMOVAL/INSTALLATION [MZ-CD 1.6].)
Go to the next step.
No
Go to the next step.
8
VERIFY AFTER REPAIR PROCEDURE
•  Perform the after repair procedure.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZ-CD 1.6].)
No
DTC troubleshooting completed.