P0562
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 below 11V, ECM sets P0562. 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. Check voltage
(1) IG "OFF".
(2) Disconnect the main relay.
(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 open in harness" procedure.
NO
> Check the fuse between battery and main relay.
> Repair Open or Short to ground in power circuit and go to "Verification of Vehicle Repair" procedure
2. Check open in harness
(1) IG "OFF".
(2) Disconnect main relay and ECM connector.
(3) Measure the resistance between terminal 87 of main relay harness connector and terminals 38, 39, 40 of ECM harness connector(C144-A).
Specification : Approx. below 1Ohms
(4) Is the measured resistance within specification ?
YES
> Go to "Check short in harness" procedure.
NO
> Repair open in harness and go to "Verification of Vehicle Repair" procedure.
3. Check short in harness
(1) IG "OFF".
(2) Disconnect main relay and ECM connector.
(3) Measure the resistance between terminal 87 of main relay harness connector and chassis ground.
Specification : Infinite
(4) Is the measured resistance within specification ?
YES
> Go to "Control circuit inspection" procedure.
NO
> Repair short in harness and go to "Verification of Vehicle Repair" procedure.
CONTROL CIRCUIT INSPECTION
1. Check short in harness
(1) IG "OFF".
(2) Disconnect main relay and ECM connector.
(3) Measure the resistance between terminal 85 of main relay harness connector and chassis ground.
Specification : Infinite
(4) Is the measured resistance within specification ?
YES
> Go to "Check open in harness" procedure.
NO
(5) > Repair short in control harness and go to "Verification of Vehicle Repair" procedure.
2. Check open in harness
(1) IG "OFF".
(2) Disconnect main relay and ECM connector.
(3) Measure the resistance between terminal 85 of main relay harness connector and terminal 43 of ECM harness connector(C144-A).
Specification : Approx. below 1Ohms
(4) Is the measured resistance within specification ?
YES
> Go to "System inspection" procedure.
NO
> Repair open in control 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".
(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
> In case terminal 2 : Repair MIL circuit, MIL resistor or Open in circuit and go to "Verification of Vehicle Repair" procedure.
> In case terminal 3 : Repair the fuse between battery and Ignition switch, the fuse between Ignition switch and alternator or Open in 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
> 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 Main relay and check for proper operation. If the problem is corrected, replace Main relay 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.