Mitsubishi Grandis. Manual — part 361

COMBINATION METER

CHASSIS ELECTRICAL

54A-63

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
driving the vehicle or entering simulated vehicle
speed) and then stop the vehicle.

COMMENTS ON TROUBLE SYMPTOM

If only the speedometer does not operate, the
engine-ECU <M/T> or engine-A/T-ECU <A/T>
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.

POSSIBLE CAUSES

• Damaged harness wires and connectors

• Malfunction of engine-ECU <M/T> or

engine-A/T-ECU <A/T>

• Malfunction of combination meter

DIAGNOSTIC PROCEDURE

Step 1. MUT-III CAN bus diagnostics

Use the MUT-III to diagnose the CAN bus lines.

Q: Is the check result satisfactory?

YES :

Go to Step 2.

NO :

Repair the CAN bus lines (Refer to GROUP
54D, Diagnosis

− Can Bus Diagnostic Table

P.54D-16

). After diagnosing the CAN bus

lines, go to Step 5.

Step 2. MUT-III other system diagnosis code

Check whether the MPI system-related diagnosis
code is set.

Q: Is the diagnosis code set?

YES :

Diagnose the MPI system (Refer to GROUP

13A, Troubleshooting

P.13A-20

). After

diagnosing the MPI system, go to Step 5.

NO :

Go to Step 3.

Step 3. MUT-III data list

• Item No.82: Vehicle speed sensor malfunction

flag (Refer to

P.54A-74

.)

• Item No.83: Vehicle speed sensor definite flag

(Refer to

P.54A-74

.)

• Item No.84: Vehicle stopped flag (Refer to

P.54A-74

.)

Q: Is the check result satisfactory?

YES :

Go to Step 4.

NO :

Diagnose the MPI system (Refer to GROUP
13A, Troubleshooting

P.13A-20

). After

diagnosing the MPI system, go to Step 5.

Step 4. Check the speedometer.
(1) Connect the MUT-III to the diagnosis connector.
(2) Use the MUT-III to enter simulated vehicle speed.

OK: The speedometer shows that
simulated vehicle speed.

Q: Is the check result satisfactory?

YES :

Go to Step 5.

NO :

Replace combination meter, then go to Step
5.

Step 5. Retest the system.

Check that the speedometer works normally.

Q: Is the check result satisfactory?

YES :

The procedure is complete.

NO :

Go to Step 1.

COMBINATION METER

CHASSIS ELECTRICAL

54A-64

INSPECTION PROCEDURE 8: Tachometer does not Work (other meters work).

: LHD
: RHD

NOTE

COMBINATION
METER

CPU

ENGINE-ECU <M/T>
OR
ENGINE-A/T-ECU <M/T>

· OUTPUT SHAFT
SPEED SENSOR <A/T>
· VEHICLE SPEED SENSOR <M/T>

INPUT SIGNAL

DIAGNOSIS
CONNECTOR

FRONT
SIDE

Wire colour code
B : Black
LG : Light green
G : Green
L: Blue
W : White
Y: Yellow
SB : Sky blue
BR : Brown
O : Orange
GR : Gray
R : Red
P : Pink
V : Violet

TACHO

Tachometer Circuit

COMBINATION METER

CHASSIS ELECTRICAL

54A-65

COMMENTS ON TROUBLE SYMPTOM

If only the tachometer does not operate, the
engine-ECU <M/T> or engine-A/T-ECU <A/T>
system may not be sending ignition signal, or the
combination meter, the wiring harness or its
connector may be defective.

POSSIBLE CAUSES

• Malfunction of combination meter

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. MUT-III CAN bus diagnostics

Use the MUT-III to diagnose the CAN bus lines.

Q: Is the check result satisfactory?

YES :

Go to Step 2.

NO :

Repair the CAN bus lines (Refer to GROUP
54D, Diagnosis

− Can Bus Diagnostic Table

P.54D-16

). After diagnosing the CAN bus

lines, go to Step 5.

Step 2. MUT-III other system diagnosis code

Check whether the MPI system-related diagnosis
code is set.

Q: Is the diagnosis code set?

YES :

Diagnose the MPI system (Refer to GROUP

13A, Troubleshooting

P.13A-20

). After

diagnosing the MPI system, go to Step 5.

NO :

Go to Step 3.

Step 3. MUT-III data list

• Item No.87: Tachometer (Refer to

P.54A-74

.)

Q: Is the check result satisfactory?

YES :

Go to Step 4.

NO :

Diagnose the MPI system (Refer to GROUP
13A, Troubleshooting

P.13A-20

). After

diagnosing the MPI system, go to Step 5.

Step 4. MUT-III actuator test

• Item No.84: Tachometer: 0 r/min

• Item No.85: Tachometer: 2000 r/min

• Item No.86: Tachometer: 5000 r/min

OK: The tachometer operates.

Q: Is the check result satisfactory?

YES :

Go to Step 5.

NO :

Replace the combination meter and then go
to Step 5.

Step 5. Retest the system.

Check that the tachometer works normally.

Q: Is the check result satisfactory?

YES :

The procedure is complete.

NO :

Go to Step 1.

COMBINATION METER

CHASSIS ELECTRICAL

54A-66

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

COMMENTS ON TROUBLE SYMPTOM

If only the fuel gauge does not operate, the fuel tank
pump and gauge unit assembly, fuel tank gauge unit,
combination meter, wiring harness or connector(s)
may be defective.

POSSIBLE CAUSES

• Damaged harness wires and connectors

• Malfunction of fuel tank gauge unit

• Malfunction of fuel tank pump and gauge unit

assembly

• Malfunction of combination meter

Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Gray R : Red P : Pink V : Violet

Fuel Gauge Circuit

COMBINATION
METER

CPU

FUEL TANK
GAUGE
UNIT

FUEL TANK
PUMP AND
GAUGE UNIT
ASSEMBLY

F/GA