SWS ± Troubleshooting
54B-9
Code No.13 Failure concerning the front-ECU Probable cause
This diagnosis code is displayed when the signals that the front-ECU sends to
the ETACS-ECU are errors consecutive fifteen times in 0.6 second.
The diagnosis code will be erased when the front-ECU sends normal signals to
the ETACS-ECU consecutive 15 times in 0.6 second.
D Malfunction of front-ECU
D Malfunction of ETACS-ECU
D Malfunction of wiring harness or connector
Is diagnosis code No. 12 output
when the ignition switch is at the
ON position?
Yes
Measure at front-ECU connector A-37X.
D Disconnect connector and
measure at harness side.
D Voltage between terminal 7 and
body earth
OK: System voltage
NG
Check the following connector:
A-37X
NG
Check the harness wire between front-
ECU and fusible link (3).
No
Measure at front-ECU connector A-38X.
D Disconnect connector and
measure at harness side.
D Continuity between terminal 31
and body earth.
OK: Continuity
NG
Check the following connector:
A-38X
NG
Repair
OK
Replace the front-ECU.
OK
Check trouble symptoms.
NG
Check the harness wire between front-
ECU and body earth.
OK
Check the following connectors:
A-38X, C-02, C-29, C-83
NG
Repair
NG
Repair
OK
Check trouble symptoms.
OK
Check the trouble symptoms.
NG
Check the harness wire between front-
ECU and ETACS-ECU.
NG
Replace the front-ECU or ETACS-ECU.
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