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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

ECM sets DTC P0562 if the ECM detects system voltage lower than the possible range of battery voltage.

DTC DETECTING CONDITION

Item	Detecting Condition	Possible Cause
DTC Strategy	● Electrical check	● Contact resistance in connectors ● Faulty charging system
Enable Conditions	● No relevant failure ● Vehicle speed ＞ 10kph(6mph)
Threshold Value	● Voltage after main relay when ON ＜ 10V
Diagnostic Time	● 30 sec.
MIL On Condition	● 2 Driving Cycles

SIGNAL WAVEFORM AND DATA

SCHEMATIC DIAGRAM

MONITOR DTC STATUS

note

If any codes relating to system voltage(P0562) is stored, do ALL REPAIRS associated with those codes before proceeding with troubleshooting

Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode

Press F4(DTAL) to select DTC information from the DTCs menu

Confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions

Read "DTC Status" parameter

Is parameter displayed "History(Not Present) fault"?

note

History (Not Present) fault : DTC occurred but has been cleared.

Present fault : DTC is occurring at present time.

▶ 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, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.

▶ Go to next step as below.

TERMINAL AND CONNECTOR INSPECTION

Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

Has a problem been found?

▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure

▶ Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "Verification of Vehicle Repair" procedure

SYSTEM INSPECTION

Start the engine and raise the engine speed to 2,500~3,000 RPM

Turn ON all electrical loads by turning on the headlamps, and by turning on the high blower motor, etc

Monitor the battery(ignition) voltage parameter on the Scantool data list

Specification :

Ambient temperature ℃(℉)	Reference Voltage(V)
-20(-4)	Approx. 14.2~15.4
20(68)	Approx. 14.0~15.0
60(140)	Approx. 13.7~14.9
80(176)	Approx. 13.5~14.7

Is the battery voltage within the specification?

▶ Go to next step as below

▶ Possibility of charging system malfunction. Repair or replace alternator and battery. Refer to Charging System group in Workshop manual. And then 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.

Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.

Press F4(DTAL) and confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.

Read "DTC Status" parameter.

Is parameter displayed "History(Not Present) fault"?

▶ System performing to specification at this time. Clear the DTC

▶ Go to the applicable troubleshooting procedure.