P0563

COMPONENT LOCATION





GENERAL DESCRIPTION

The ECM provides ground to one side of the coil of the main relay and the other side is connected to the battery. The ECM monitors battery voltage and the voltage after the main relay.

DTC DESCRIPTION

If system voltage is above 16V, ECM sets P0563. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.

DTC DETECTING CONDITION





SPECIFICATION





SCHEMATIC DIAGRAM





MONITOR DTC STATUS

1. Check DTC Status
(1) Connect scantool to Data Link Connector(DLC).
(2) IG "ON".
(3) Select "Diagnostic Trouble Codes(DTCs)" mode, and then Press F5(INFO) to check DTC's information from the DTCs menu
(4) Read "DTC Status" parameter.




(5) Is "Present" Fault displayed?
YES
> Go to "Terminal and connector inspection" procedure.
NO
> Fault is intermittent caused by poor contact in the sensor's and/or ECM's connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for looseness, poor connection, ending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.

TERMINAL AND CONNECTOR INSPECTION

1. Many malfunctions in the electrical system are caused by poor harness and terminal condition. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES
> Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
> Go to " Power Circuit Inspection " procedure.

POWER CIRCUIT INSPECTION

1. Power circuit inspection
(1) IG "OFF".
(2) Disconnect the main relay connector.
(3) IG "ON" and ENG "OFF".
(4) Measure the voltage between terminal 30 of main relay harness connector and chassis ground.
(5) Measure the voltage between terminal 86 of main relay harness connector and chassis ground.

Specification : B+





(6) Is the measured voltage within specification ?
YES
> Go to "Check short in harness" procedure.
NO
> Repair Short in power harness and go to "Verification of Vehicle Repair" procedure.
2. Check short in harness
(1) IG "ON".
(2) Measure the voltage between terminal 38, 39, 40 of ECM harness connector(C144-A) and chassis ground.

Specification : B+





(3) Is the measured voltage within specification ?
YES
> Go to "System inspection" procedure.
NO
> Repair short in power harness and go to "Verification of Vehicle Repair" procedure.

SYSTEM INSPECTION

1. Check Alternator circuit
(1) IG "OFF".
(2) Disconnect alternator connector.
(3) IG "ON" and ENG "OFF"
(4) Measure the voltage between terminal 2 of alternator and chassis ground.
(5) Measure the voltage between terminal 3 of alternator and chassis ground.

Specification : B+





(6) Is the measured voltage within specification?
YES
> Go to "Component inspection" procedure.
NO
> Repair short in Sensing circuit or MIL circuit and go to "Verification of Vehicle Repair" procedure.

COMPONENT INSPECTION

1. Check Main relay
(1) IG "OFF".
(2) Disconnect the main relay.
(3) Measure the resistance between terminal 30 and 87 of main relay.
(4) Measure the resistance between terminal 85 and 86 of main relay.

Specification : 70 - 120Ohms









(5) Is the measured resistance within specification ?
YES
> Go to "Check Alternator" procedure.
NO
> Substitute with a known - good Main relay and check for proper operation. If the problem is corrected, replace Main relay and go to "Verification of Vehicle Repair" procedure.
2. Check Alternator
(1) IG "OFF".
(2) Check the tension of the belt.
(3) Check Battery terminal and Alternator B+ terminal for looseness, corrosion or damage.
(4) Engine "ON".
(5) Operate electric equipments (Head lamp, Hot wire, etc).
(6) accelerate engine to 2000 RPM and measure the battery voltage.

Specification : Approx. 12.5V ~ 14.5V


(7) Is the measured voltage within specification ?
YES
> Substitute with a known - good ECM and check for proper operation. If the problem is corrected, replace ECM and go to "Verification of Vehicle Repair" procedure.
NO
> Substitute with a known - good Alternator and check for proper operation. If the problem is corrected, replace Alternator and go to "Verification of Vehicle Repair" procedure.

NOTE:
There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by ECM. After testing ECM on the vehicle, use this function before reusing the ECM

VERIFICATION OF VEHICLE REPAIR

After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode
2. Press F5(INFO) and confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions
3. Read "DTC Status" parameter
4. Is "History (Not Present)" fault displayed?
YES
> System performing to specification at this time. Clear the DTC
NO
> Go to the applicable troubleshooting procedure.