Mitsubishi Galant (2004+). Manual — part 464
DIAGNOSIS
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CONTROLLER AREA NETWORK (CAN)
54C-467
STEP 1. Check data link connector C-125 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
CAUTION
The strand end of the twisted wire should be within 10 cm
(4 inches) from the connector. For details refer to
Q: Is data link connector C-125 in good condition?
YES : Go to Step 2.
NO : Repair the damaged parts.
AC305231AR
CONNECTOR: C-125
C-125 (B)
DIAGNOSIS
TSB Revision
CONTROLLER AREA NETWORK (CAN)
54C-468
STEP 2. Check the CAN bus lines at the data link
connector. Measure the resistance at the data link
connector C-125.
CAUTION
A digital multimeter should be used. For details refer to
CAUTION
The test wiring harness should be used. For details refer to
(1) Measure the resistance at the data link connector.
(2) Turn the ignition switch to the "LOCK" (OFF) position.
CAUTION
Disconnect the negative battery terminal. For details refer
to
.
(3) Disconnect the negative battery terminal.
(4) Measure the resistance between data link connector
terminals 6 and 14.
Q: How much resistance is measured?
2 ohms or less : Diagnostic Item 7: Check the CAN_L and
H lines for a short circuit. Refer to
No continuity : Diagnostic Item 10: Diagnose terminator
resistors at both ends. Refer to
More than 2 ohms but continuity exists : Go to Step 3.
AC305231AR
CONNECTOR: C-125
C-125 (B)
AC204740
AC204740
AC204740
AC204740
AC204740
AC204740
AC204740
AC204740
AC204740DA
TEST
HARNESS
TEST
HARNESS
HARNESS SIDE: C-125
DIAGNOSIS
TSB Revision
CONTROLLER AREA NETWORK (CAN)
54C-469
STEP 3. Check intermediate connector C-29 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
CAUTION
The strand end of the twisted wire should be within 10 cm
(4 inches) from the connector. For details refer to
Q: Is intermediate connector C-29 in good condition?
YES : Go to Step 4.
NO : Repair the damaged parts.
AC305231AI
CONNECTOR: C-29
DIAGNOSIS
TSB Revision
CONTROLLER AREA NETWORK (CAN)
54C-470
STEP 4. Using scan tool MB991958, diagnose the CAN bus
line (Disconnect intermediate connector C-29, and then
determine that a failure is present at either the front wiring
harness side or the instrument panel wiring harness side).
(1) Disconnect intermediate connector C-29.
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.
(2) Connect scan tool MB991958 to the data link connector.
(3) Turn the ignition switch to the "ON" position.
(4) Diagnose CAN bus lines, and check if the MUT-III screen is
as shown in the illustration.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
(6) Connect intermediate connector C-29.
Q: Does the MUT-III screen correspond to the illustration?
YES : If the MUT-III screen corresponds to the illustration,
go to Step 20 .
NO : If the MUT-III screen does not correspond to the
illustration, go to Step 5.
AC305231AI
CONNECTOR: C-29
AC206894
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC306073
: Red section on screen
PCM
METER
-ECU
AB
MUT
ETACS
-ECU
AC-ECU
SRS-ECU
J/C
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