P0561

DTC P0561






GENERAL DESCRIPTION
The main relay voltage is monitored for high or low voltage values that may indicate main relay, main relay circuit, or engine electrical system malfunctions.

DTC DESCRIPTION
If the system voltage is below 2.54 V during 0.2 sec, ECM/PCM sets DTC P0561.

DTC Detecting Condition:

Schematic Diagram - A/T:

Schematic Diagram - M/T:

MONITOR SCANTOOL DATA
1. Connect scantool to Data Link Connector(DLC).
2. Warm up the engine to normal operating temperature.




3. Monitor the "Main relay" parameters on the scantool.
4. Are the parameters displayed correctly?

YES - Fault is intermittent caused by poor contact in the sensor's and/or ECM's connector or was repaired and ECM/PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of vehicle Repair" procedure.

NO - Go to "W/Harness Inspection" procedure.

TERMINAL AND CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness and terminals. 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 "Terminal and connector inspection" procedure.

POWER CIRCUIT INSPECTION
1. Key "OFF".
2. Disconnect Main relay and Key "ON".
3. Measure the voltage between terminal 30 of main relay harness connector and chassis ground.




4. Measure the voltage between terminal 86 of main relay harness connector and chassis ground.

Specification : B+

5. Is the measured voltage within specification?

YES - Go to "System inspection" procedure.

NO
- Check the fuse(ECU A 30A) between battery and main relay.
- Repair Open in power circuit and then go to "Verification of vehicle Repair" procedure.

SYSTEM INSPECTION
1. Alternator circuit check
a. Key "OFF".
b. Disconnect alternator connector.
c. Key "ON".
d. Measure the voltage between terminal 1/E01 of alternator harness connector and chassis ground.Measure the voltage between terminal 2/E02 of alternator harness connector and chassis ground.




Specification : 12 V




Specification : 10.5-11.5 V

e. Is the measured voltage within specification ?

YES - Go to "Component inspection" procedure.

NO
- In case the voltage is not stable at terminal 1/E01, check Open circuit, Battery voltage and Fuse(MAIN 120 A). And then go to "Verification of vehicle Repair" procedure.
- In case the voltage is not stable at terminal 2/E02, check Open circuit, MIL circuit and MIL resistor. And then go to "Verification of vehicle Repair" procedure.

COMPONENT INSPECTION
1. Main relay check.
a. Key "OFF".
b. Disconnect Main relay.
c. Measure the resistance between terminal 30 and 87 of main relay. (Component side)

Specification:

d. Measure the resistance between terminal 85 and 86 of main relay. (Component side)
e. Is the measured resistance within specifications?

YES - Go to "Alternator check" 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. Alternator check.
a. Key "OFF".
b. Check the tension of alternator belt.
c. Check corrosion, damage or looseness of Battery terminal and Alternator terminal.
d. Engine start.
e. Operate electrical parts(Head lamp, Defogger, etc.).
f. Measure the voltage at 2000rpm.

Specification : Approx 12.5V - 14.5V

g. Is the measured voltage within specifications?

YES
- Substitute with a known - good ECM/PCM and check for proper operation.
- If the problem is corrected, replace ECM/PCM 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.

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. Clear the DTCs and Operate the vehicle within DTC Enable conditions in General information.
3. Are any DTCs present ?

YES - Go to the applicable troubleshooting procedure.

NO - System is performing to specification at this time.