Mitsubishi Colt Ralliart. Manual - part 478

COMBINATION METER

CHASSIS ELECTRICAL

54A-57

Inspection Procedure 10: Engine Coolant Temperature Gauge does not Work (Other Meters Work).

Engine Coolant Temperature Gauge Circuit

DIAGNOSIS 
CONNECTOR

INPUT SIGNAL

FRONT SIDE

COMBINATION 
METER

CPU

T/GA

SECONDARY SPEED SENSOR

ENGINE-ECU <M/T>
ENGINE-CVT-ECU <CVT>

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

Main

Index

Group

TOC

COMBINATION METER

CHASSIS ELECTRICAL

54A-58

COMMENTS ON TROUBLE SYMPTOM

If only the engine coolant temperature gauge does 
not operate, the engine-ECU <M/T> or 
engine-CVT-ECU <CVT> system, the combination 
meter, the wiring harness or its connector may be 
defective.

POSSIBLE CAUSES

• Damaged harness wires and connectors

• Malfunction of engine-ECU <M/T> or 

engine-CVT-ECU <CVT>

• Malfunction of combination meter

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-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 Diagnostics Table 

P.54D-13

). After diagnosing the CAN bus 

lines, go to Step 5.

STEP 2. M.U.T.-III other system diagnosis code
Check if an MPI system diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Diagnose MPI system. (Refer to GROUP 

13A <4A9>, Troubleshooting 

P.13A-20

, or 

GROUP 13B <4G1>, Troubleshooting 

P.13B-18

.) After diagnosing the MPI 

system, go to Step 5.

NO : 

Go to Step 3.

STEP 3. M.U.T.-III data list

• Item No.8C: Water thermometer (Refer to 

P.54A-59

.)

• Item No.8E: Water thermometer definite flag 

(Refer to 

P.54A-59

.)

Q: Is the check result satisfactory?

YES : 

Go to Step 4.

NO : 

Diagnose MPI system. (Refer to GROUP 
13A <4A9>, Troubleshooting 

P.13A-20

, or 

GROUP 13B <4G1>, Troubleshooting 

P.13B-18

.) After diagnosing the MPI 

system, go to Step 5.

STEP 4. M.U.T.-III actuator test

• Item No.88: Water temperature gauge:  0 °C

• Item No.89: Water temperature gauge:  85 °C

• Item No.8A: Water temperature gauge:  126 °C

OK: The water thermometer operates.

Q: Is the check result satisfactory?

YES : 

Go to Step 5.

NO : 

Replace combination meter and then go to 
step 5.

STEP 5. Retest the system.
Check to see that the engine coolant temperature 
gauge operates normally.

Q: Is the check result satisfactory?

YES : 

The procedure is complete.

NO : 

Go to Step 1.

Main

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Group

TOC

COMBINATION METER

CHASSIS ELECTRICAL

54A-59

DATA LIST REFERENCE TABLE

M1543007300916

The following items of the ECU input data can be 
read using M.U.T.-III.

Item No.

Check items

Check conditions

Normal conditions

80

Speedometer

Perform a test run of the 
vehicle.

Speedometer displayed value and 
M.U.T.-III displayed value agree with 
each other.

*

81

Speedometer (target 
value)

Perform a test run of the 
vehicle.

Speedometer displayed value and 
M.U.T.-III displayed value agree with 
each other.

*

82

Vehicle speed sensor 
malfunction flag

Ignition switch : ON

Without

83

Vehicle speed sensor 
definite flag

Ignition switch : ON

Set

84

Vehicle stopped flag

• Ignition switch : ON

• Vehicle speed 0 km/h 

Set

87

Tachometer

Start the engine.

Tachometer displayed value and 
M.U.T.-III displayed value agree with 
each other.

89

Fuel gauge

−

Fuel gauge unit resistance value and 
M.U.T.-III displayed value agree with 
each other.

8A

Fuel gauge (target value) −

Fuel gauge and M.U.T.-III displayed 
values agree with each other.

8C

Water thermometer

Ignition switch : ON

Water thermometer and M.U.T.-III 
displayed values agree with each 
other.

8E

Water thermometer 
definite flag

Ignition switch : ON

Set

90

Odometer

−

Odometer displayed value and 
M.U.T.-III displayed value agree with 
each other.

A0

Door-ajar warning light

All doors are closed

OFF

Any door is open

ON

A1

SRS warning lamp

−

OFF

A2

ABS warning lamp

−

OFF

A3

Hydraulic pressure 
warning lamp 

−

OFF

A4

Charging warning lamp

−

OFF

A5

Engine warning lamp

−

OFF

A6

Fuel reserve warning 
lamp

−

OFF

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Group

TOC

COMBINATION METER

CHASSIS ELECTRICAL

54A-60

A7

Brake warning lamp

• Ignition switch : ON

• Parking brake : At 

release

OFF

• Ignition switch : ON

• Parking brake : 

OPERATION

ON

A8

Seat belt warning lamp

• Ignition switch : ON

• Driver's seatbelt : 

fastened

OFF

• Ignition switch : ON

• Driver's seatbelt : Not 

fastened

ON

A9

Electric power steering 
warning lamp

−

OFF

B1

Turn-signal indicator 
(RH)

Turn signal lamp : OFF 
or only left side lamp 
illuminates

OFF

Turn signal lamp : Right 
side lamp illuminates

ON

B2

Turn-signal indicator 
(LH)

Turn signal lamp : OFF 
or only right side lamp 
illuminates

OFF

Turn signal lamp : Left 
side lamp illuminates

ON

B3

Front fog lamp indicator

Fog lamp :  OFF

OFF

Fog lamp :  ON

ON

B4

High-beam indicator

Headlamps : OFF or low 
beam illuminates

OFF

Headlamps : High beam 
illuminates

ON

C1

CVT indicator: P

Shift position : Other than 
P position

OFF

Shift position : P position ON

C2

CVT indicator: R

Shift position : Other than 
R position

OFF

Shift position : R position ON

C3

CVT indicator: N

Shift position : Other than 
N position

OFF

Shift position : N position ON

C4

CVT indicator: D

Shift position : Other than 
D position

OFF

Shift position : D position ON

C5

CVT indicator: Ds

Shift position : Other than 
Ds position

OFF

Shift position : Ds 
position

ON

Item No.

Check items

Check conditions

Normal conditions

Main

Index

Group

TOC