Mitsubishi Galant (2004+). Manual - part 1462

COMBINATION METER ASSEMBLY AND VEHICLE SPEED SENSOR

TSB Revision

CHASSIS ELECTRICAL

54A-91

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

COMBINATION METER ASSEMBLY AND VEHICLE SPEED SENSOR

TSB Revision

CHASSIS ELECTRICAL

54A-92

.

CIRCUIT OPERATION
The powertrain control module sends ignition signal 
to the combination meter via CAN bus line.

.

TECHNICAL DESCRIPTION (COMMENT)
If only the tachometer does not operate, the 
powertrain control module system may not be send-
ing ignition signal, or the combination meter, the wir-
ing harness or its connector may be defective.

.

TROUBLESHOOTING HINTS

• Malfunction of the combination meter

• 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

• MB991911: MUT-III Main Harness A (Vehicles with CAN 

communication system)

AC305206

CONNECTOR: A-02

AO

A-02 (GR)

AC305216

B-19 (B)

CONNECTOR: B-19, B-23

AF

B-23

AC305231

C-02

C-29

C-101

DD

CONNECTORS: C-02, C-29, C-101

COMBINATION METER ASSEMBLY AND VEHICLE SPEED SENSOR

TSB Revision

CHASSIS ELECTRICAL

54A-93

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 3.

STEP 2. Using scan tool MB991958, read MFI system 
diagnostic trouble code
Check if the MFI system DTC is set.
Q: Is the DTC set?

YES : Diagnose the MFI system (Refer to GROUP 13A, MFI 

Diagnosis 

− Diagnostic Trouble Code Chart 

P.13A-34

 

or GROUP 13B, MFI Diagnosis 

− Diagnostic Trouble 

Code Chart 

P.13B-33

). On completion, go to Step 3.

NO :  Go to Step 3.

STEP 3. Retest the system.
Check that the tachometer 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.00-6

).

NO :  Replace the combination meter.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

COMBINATION METER ASSEMBLY AND VEHICLE SPEED SENSOR

TSB Revision

CHASSIS ELECTRICAL

54A-94

INSPECTION PROCEDURE 9: Fuel Gauge does not work (other meters work).

.

CIRCUIT OPERATION

• The ignition switch (IG1) circuit is the power sup-

ply for the fuel gauge.

• When the float in the fuel level sensor moves, the 

circuit resistance will change.

• The fuel gauge needle is moved by a change in 

the circuit current.

.

TECHNICAL DESCRIPTION (COMMENT)
If only the fuel gauge does not operate, the fuel 
pump module, the fuel level sensor (sub), the combi-
nation meter, wiring harness or connector(s) may be 
defective.

.

COMBINATION 
METER

FUEL 
GAUGE

CPU

FUEL LEVEL 
SENSOR (SUB)

FUEL PUMP 
MODULE

FUEL LEVEL
SENSOR 
(MAIN)

Fuel Gauge Circuit

AC305231

C-28

C-101

CONNECTORS: C-28, C-101

CW

AC305268

AR

CONNECTORS: D-17, D-18

D-17

D-18 (GR)