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
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
or GROUP 13B, MFI Diagnosis
− Diagnostic Trouble
). 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
).
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)
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