Mitsubishi Galant 9G. Manual - part 1553

COMBINATION METER ASSEMBLY

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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

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CHASSIS ELECTRICAL

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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 

P.54C-14

). 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 

P.23A-42

. 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

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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 

P.00-14

).

NO :  Go to step 1.

COMBINATION METER ASSEMBLY

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CHASSIS ELECTRICAL

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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