How To Proceed With Troubleshooting

VEHICLE BROUGHT TO WORKSHOP
PROBLEM SYMPTOM CONFIRMATION

CHECK MULTIPLEX COMMUNICATION SYSTEM

Refer to the how to proceed with troubleshooting (See HOW TO PROCEED WITH TROUBLESHOOTING ).

Check for output DTCs.

Result

RESULT REFERENCE

Result	Proceed to
MPX DTC is not output	A
MPX DTC is output	B

HINT:

The ECM of this system is connected to the multiplex communication system. Therefore, before starting troubleshooting, make sure to check that there is no trouble in the multiplex communication system.

B: PROCEED TO MULTIPLEX COMMUNICATION SYSTEM

A: Go to Next Step

CHECK CAN COMMUNICATION SYSTEM

Refer to the precaution (See CAN COMMUNICATION SYSTEM ).

Check for output DTCs.

Result

RESULT REFERENCE

Result	Proceed to
CAN DTC is not output	A
CAN DTC is output	B

HINT:

The ECM of this system is connected to the CAN communication system. Therefore, before starting troubleshooting, make sure to check that there is no trouble in the CAN communication system.

B: PROCEED TO CAN COMMUNICATION SYSTEM

A: Go to Next Step

DTC CHECK AND CLEAR
Refer to the DTC check/clear (See DTC CHECK / CLEAR ).

DTC CHECK (OTHER THAN MPX AND CAN SYSTEM DTC)

Refer to the DTC check/clear (See DTC CHECK / CLEAR ).

Result

RESULT REFERENCE

Result	Proceed to
DTC is not output	A
DTC is output	B

A: Go to step 8

B: Go to Next Step

DTC CHART
Refer to the diagnostic trouble code chart (See DIAGNOSTIC TROUBLE CODE CHART ).

NEXT: Go to step 11

PROBLEM SYMPTOM SIMULATION

Result

RESULT REFERENCE

Result	Proceed to
Fault is not listed in problem symptoms table	A
Fault is listed in problem symptoms table	B

B: Go to step 10

A: Go to Next Step

SYMPTOM SIMULATION
Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE .
PROBLEM SYMPTOMS TABLE
Refer to PROBLEM SYMPTOMS TABLE .
CIRCUIT INSPECTION
TERMINALS OF ECU
Refer to TERMINALS OF ECU .
IDENTIFICATION OF PROBLEM
REPAIR OR REPLACE
CONFIRMATION TEST
NEXT: END