DIAGNOSTIC TROUBLE CODE PROCEDURES
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-56
Past trouble
• If DTC 021 is stored as a past trouble, carry out
diagnosis with particular emphasis on wiring and
connector(s) in the CAN bus line between the
combination meter and the ETACS-ECU, and the
power supply system to the combination meter.
For diagnosis procedures, refer to "How to cope
with past trouble" (Refer to GROUP 00, How to
treat past trouble
P.00-16
).
NOTE: You cannot find a past trouble, by the
MUT-III CAN bus diagnostics even if there is a
failure in CAN bus lines. In this case, refer to
GROUP 00, How to Cope with Intermittent Mal-
function
P.00-14
and check the CAN bus lines.
You can narrow down the possible cause of the
trouble by referring to the DTC, which is set
regarding the CAN communication-linked ECUs
(Refer to GROUP 54C, CAN Bus Line Diagnostic
Flow
P.54C-6
).
.
TROUBLESHOOTING HINTS
• The ETACS-ECU may be defective
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect
SWS monitor
P.54B-13
."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
Diagnosis
P.54C-14
).
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827