Mitsubishi Galant 9G. Manual — part 1553
COMBINATION METER ASSEMBLY
TSB Revision
CHASSIS ELECTRICAL
54A-84
CAUTION
When the battery cable is disconnected or the
combination meter is removed, the fuel gauge
learned value will be erased. To let the display
unit re-learn it, enter the vehicle speed (by driv-
ing the vehicle or entering simulated vehicle
speed) and then stop the vehicle.
.
CIRCUIT OPERATION
The output shaft speed sensor sends vehicle signal
to the combination meter via the powertrain control
module and the CAN bus line.
.
TECHNICAL DESCRIPTION (COMMENT)
If only the speedometer does not operate, the power-
train control module system, the combination meter,
the wiring harness or its connector may be defective.
Furthermore, incorrect level of fuel is shown on the
gauge, because the display unit can not learn the
fuel gauge.
.
TROUBLESHOOTING HINTS
• Malfunction of the combination meter
• Malfunction of the powertrain control module
• The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector.
DIAGNOSIS
Required Special Tools:
• 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 (Vehicles with CAN
communication system)
AC305206
CONNECTOR: A-02
AO
A-02 (GR)
AC305216
B-19 (B)
B-22 (B)
B-107 (GR)
CONNECTORS: B-19, B-22, B-107
AE
AC305231
C-02
C-29
C-101
DD
CONNECTORS: C-02, C-29, C-101
COMBINATION METER ASSEMBLY
TSB Revision
CHASSIS ELECTRICAL
54A-85
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to "ON" position.
(3) Diagnose the CAN bus line.
Q: Is the check result satisfactory?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP 54C,
Diagnosis-Can Bus Diagnostic Chart
). On
completion, go to Step 4.
STEP 2. Using scan tool MB991958, read A/T diagnostic
trouble code.
Check if an A/T system DTC is set.
Q: Is the DTC set?
YES : Refer to GROUP 23A, Automatic Transaxle
Diagnosis
− Diagnostic Trouble Code Chart
. On completion, go to Step 4.
NO : Go to Step 3.
STEP 3. Check the speedometer
Use scan tool MB991958 to enter simulated vehicle speed.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to "ON" position.
(3) Select "Interactive Diagnosis" from the start-up screen.
(4) Select "System Select."
(5) Choose "Meter" from the "BODY" tab.
(6) Select "Simulated vehicle Speed Output."
OK: The speedometer shows that simulated vehi-
cle speed.
Q: Is the check result satisfactory?
YES : Go to Step 4.
NO : Replace the combination meter, then go to Step 4.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
COMBINATION METER ASSEMBLY
TSB Revision
CHASSIS ELECTRICAL
54A-86
STEP 4. Retest the system.
Check that the speedometer works normally.
Q: Is the check result satisfactory?
YES : The procedure is complete. (If no malfunctions are
found in all steps, an intermittent malfunction is
suspected. Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunction
NO : Go to step 1.
COMBINATION METER ASSEMBLY
TSB Revision
CHASSIS ELECTRICAL
54A-87
INSPECTION PROCEDURE 8: Tachometer does not Work.
ABS-ECU OR ABS/TCL-ECU
IGNITION SYSTEM
JOINT
CONNECTOR (3)
COMBINATION
METER
DATA LINK
CONNECTOR
WITHOUT ELECTRONIC
BRAKE-FORCE
DISTRIBUTION (EBD)
AND ANTI-LOCK
BRAKING SYSTEM
(ABS)
WITH ELECTRONIC
BRAKE-FORCE
DISTRIBUTION (EBD)
AND ANTI-LOCK
BRAKING SYSTEM
(ABS)
WITH ELECTRONIC
BRAKE-FORCE
DISTRIBUTION (EBD)
AND ANTI-LOCK
BRAKING SYSTEM
(ABS)
WITHOUT
ELECTRONIC
BRAKE-FORCE
DISTRIBUTION (EBD)
AND ANTI-LOCK
BRAKING SYSTEM
(ABS)
POWERTRAIN
CONTROL
MODULE
q
3.8L ENGINE r
TACHO
METER
CPU
Tachometer Circuit
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