How To Troubleshoot

WARNING: This page is about a different car, the 2018 Subaru BRZ. However, it is still accessible from the selected car via links, so may be relevant.

Bring in the car
Phenomenon check

Communication function inspection of the CAN communication system

Check that there are no abnormal condition in CAN communication system. (Refer to HOW TO TROUBLESHOOT )

RESULT DESCRIPTION

Result	Go to
If CAN communication system is normal [No DTC (CAN communication error, ECM communication error, or lost communication) is output]	A
If CAN communication system is not normal [DTC (CAN communication error, ECM communication error, or lost communication) is output]	B

B: Repair the fault according to the troubleshooting procedure for CAN system.

A: Go to next step

Communication function check of the large-scale multiplex communication system for vehicle body [LIN]

Use SSM4 to check the communication functions of the large-scale multiplex communication system for vehicle body [LIN] to confirm the communication system has no fault. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES )
NOTE: For details of DTC output, refer to the LIST OF DTC .

RESULT DESCRIPTION

Result	Go to
If the communication system is defective [DTC (LIN communication error, ECM communication error, or lost communication) is output]	A
If DTC other than for communication system is output [No diagnostic code output (LIN communication fault, ECM communication fault/communication breakdown)]	B

B: Go to the corresponding information for DTC output

A: Go to next step

DTC check

Use SSM4 to check DTC and record the code output if any. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES )
Clear diagnostic code. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES )
Simulate the conditions indicated by DTC to check whether the same DTC recur.

RESULT DESCRIPTION

Result	Go to
If no DTC is output (phenomenon can be confirmed and reproducible)	A
If no DTC is output (phenomenon can not be confirmed and not reproducible)	B
If DTC is output	C

B: Go to "How to simulate trouble phenomenon". (Refer to MALFUNCTION SYMPTOMS AND DTC CHECK )

C: Go to Troubleshooting flowchart of each DTC. (Refer to LIST OF DIAGNOSTIC CODES )

A: Go to next step

Troubleshoot the malfunction according to the method below
1. ECM terminal arrangement (Refer to ECM TERMINAL ARRANGEMENT )
Adjustment, repair, or replacement
Complete