COMMPONENT 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

During engine running, if system voltage is below 11V, PCM sets P0562. MIL(Malfunction Indication Lamp) turns on when the malfunction lasts till consecutive 2 driving cycle.

DTC DETECTING CONDITION

Item

Detecting Condition

Possible cause

DTC Strategy

●

Voltage too low

●

Poor connection

●

Open in power circuit

●

Faulty charging system

●

Faulty main relay

●

Faulty PCM

Enable Conditions

●

Engine works

●

11V ≤ Battery voltage ≤ 16V

Thresh old value

●

System voltage〈 11V

Diagnosis Time

●

Continuous

MIL On Condition

●

2 driving cycles

SPECIFICATION

Coil Resistance

70Ω ~ 120Ω

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 F4(DTAL) to check DTC's information from the DTCs menu

(4)

Read "DTC Status" parameter.

(5)

Is parameter displayed "Present fault"?

▶ Go to "Terminal and connector inspection" procedure.

▶ Fault is intermittent caused by poor contact in the sensor’s and/or PCM’s connector or was repaired and PCM 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 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?

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

▶ 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 85 of main relay harness connector and chassis ground.

Specification : B+

(6)

Is the measured voltage within specification ?

▶ Go to "Check open in harness" procedure.

▶ 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 PCM connector.

(3)

Measure the resistance between terminal 87 of main relay harness connector and terminals 38 of PCM harness connector.

(4)

Measure the resistance between terminal 87a of main relay harness connector and terminals 39, 40 of PCM harness connector.

Specification : Approx. below 1Ω

(5)

Is the measured resistance within specification ?

▶ Go to "Check short in harness" procedure.

▶ 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 PCM connector.

(3)

Measure the resistance between terminal 87a of main relay harness connector and chassis ground.

Specification : Infinite

(4)

Is the measured resistance within specification ?

▶ Go to "Control circuit inspection" procedure.

▶ 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 PCM connector.

(3)

Measure the resistance between terminal 86 of main relay harness connector and chasses ground.

Specification : Infinite

(4)

Is the measured resistance within specification ?

▶ Go to "Check open in harness" procedure.

(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 PCM connector.

(3)

Measure the resistance between terminal 86 of main relay harness connector and terminal 43 of PCM harness connector.

Specification : Approx. below 1Ω

(4)

Is the measured resistance within specification ?

▶ Go to "Ground circuit inspection" procedure.

▶ 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" and ENG "OFF"

(4)

Measure the voltage between terminal 2 of alternator and chassis gound.

(5)

Measure the voltage between terminal 3 of alternator and chassis gound.

Specification : B+

(6)

Is the measured voltage within specification?

▶ Go to "Component inspection" procedure.

▶ In case terminal 2 : Repair MIL circuit, MIL resistor or open in harness 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 harness 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 ~ 120Ω

Terminal

Power approval

30~87

NO

85~86

YES

(Approx. 70Ω ~ 120Ω)

(5)

Is the measured resistance within specification ?

▶ Substitute with a known - good PCM and check for proper operation. If the problem is corrected, replace PCM and go to "Verification of Vehicle Repair" procedure.

▶ 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 PCM. After testing PCM on the vehicle, use this function to reuse the PCM on the others

VERIFICATION OF VEHICLE REPAIR
1.

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

2.

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

3.

Read "DTC Status" parameter

4.

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

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

▶ Go to the applicable troubleshooting procedure.

Яндекс.Метрика