DTC P0563:00 [MZ-CD 1.6]

id0102g8156300

DTC P0563:00

System voltage too high
DETECTION CONDITION
•  The PCM monitors the power supply voltage at PCM terminals 302 and 305. If the voltage at PCM terminal 302 or 305 exceeds 2.296 V even if the main relay control is off, the PCM determines that the system voltage is too high.
POSSIBLE CAUSE
•  Main relay malfunction (stuck close)
•  PCM connector or terminal malfunction
•  Short to power supply circuit in wiring harness between PCM terminals 302 or 305 and ENG INJ fuse
•  Short to power supply in wiring harness between main relay terminal D and following;
―  ENG INJ fuse
―  Fuel metering valve
―  Cooling fan relay No.1
―  MAF/IAT sensor
―  A/C relay
•  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
VERIFY RELATED PENDING CODE AND/OR DTC
•  Switch the ignition to ON (engine off).
•  Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.
•  Is the other PENDING CODE/DTC also present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZ-CD 1.6].)
No
Go to the next step.
4
INSPECT MAIN RELAY
•  Inspect the main relay.
•  Is there any malfunction?
Yes
Replace the main relay, then go to Step 8.
No
Go to the next step.
5
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 Step 8.
No
Go to the next step.
6
INSPECT PCM POWER SUPPLY CIRCUIT FOR SHORT TO POWER CIRCUIT
•  Main relay is removed.
•  PCM connector is disconnected.
•  Switch the ignition to ON (engine off).
•  Measure the voltage at the PCM terminal 302 and 305 (wiring harness-side).
•  Is there any voltage?
Yes
Go to the next step.
No
Go to Step 8.
7
IDENTIFY SHORT TO POWER CIRCUIT
•  Main relay is removed.
•  PCM connector is disconnected.
•  Remove the ENG INJ fuse.
•  Switch the ignition to ON (engine off).
•  Measure the voltage at the PCM terminal 302 and 305 (wiring harness-side).
•  Is there any voltage?
Yes
Repair or replace the following wiring harness for possible short to power supply, then go to the next step.
•  Between PCM terminal 302 and ENG INJ fuse
•  Between PCM terminal 305 and ENG INJ fuse
No
Repair or replace the following wiring harness for possible short to power supply, then go to the next step.
•  Main relay terminal D and ENG INJ fuse
•  Main relay terminal D and fuel metering valve
•  Main relay terminal D and cooling fan relay No.1
•  Main relay terminal D and MAF/IAT sensor No.1
•  Main relay terminal D and A/C relay
8
VERIFY THAT DTC P0563:00 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.
Go to the next step.
No
Go to the next step.
9
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.