Mitsubishi Galant. Manual — part 626

COMBINATION METERS ASSEMBLY AND VEHICLE SPEED SENSOR

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CHASSIS ELECTRICAL

54A-57

CIRCUIT OPERATION

•

The ignition switch (IG1) circuit is the power
source for the engine coolant temperature gauge.

•

Resistance value, which the engine coolant
temperature gauge unit sends to the combination
meter, is dependent on temperature of the engine
coolant. This causes circuit current to fluctuate.

•

The engine coolant temperature gauge moves
the needle according to the circuit current.

TECHNICAL DESCRIPTION (COMMENT)
If the ignition switch (IG1) circuit is open, the gauge
needle will not move at all. If the ground circuit is
open, the gauge needle will move up to its extreme
position.

TROUBLESHOOTING

•

Malfunction of the engine coolant temperature gauge unit

•

Malfunction of the combination meter (printed-circuit board
or engine coolant temperature gauge assembly)

•

Damaged harness wires or connectors

DIAGNOSIS

Required Special Tool:
MB991223: Harness Set

AC001750AC

ENGINE COOLANT
TEMPERATURE GAUGE UNIT

CONNECTOR: B-07
<2.4L ENGINE>

AC001751AC

ENGINE COOLANT
TEMPERATURE GAUGE UNIT

CONNECTOR: B-07

<3.0L ENGINE>

AC003089 AI

CONNECTOR: C-17

AC003089 AD

CONNECTOR: C-29

AC003082 AM

CONNECTORS: C-73, C-78

C-73

C-78

JUNCTION BLOCK
(FRONT VIEW)

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CHASSIS ELECTRICAL

COMBINATION METERS ASSEMBLY AND VEHICLE SPEED SENSOR

54A-58

STEP 1. Check the speedometer operation.

Q: Does the speedometer work normally?

YES : Go to Step 2.
NO : Refer to Inspection Procedure 1

P.54A-29

.

STEP 2. Check the engine coolant temperature sensor
signal circuit at the engine coolant temperature sensor
connector B-07 by backprobing.
(1) Do not disconnect the engine coolant temperature sensor

connector B-07.

(2) Turn the ignition switch to "ON" position.
(3) Measure the voltage between terminal 1 and ground by

backprobing.

Q: Is the voltage approximately 9 volts or more?

YES : Go to Step 5.
NO : Go to Step 3.

AC003722AB

CONNECTOR: B-07

(HARNESS SIDE)

COMBINATION METERS ASSEMBLY AND VEHICLE SPEED SENSOR

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CHASSIS ELECTRICAL

54A-59

STEP 3. Check the engine coolant temperature sensor
connector B-07 and combination meter connector C-29 for
damage.
Q: Are engine coolant temperature sensor connector B-07

and combination meter connector C-29 in good
condition?
YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. The engine coolant

temperature gauge should work normally.

AC001750AC

ENGINE COOLANT
TEMPERATURE GAUGE UNIT

CONNECTOR: B-07
<2.4L ENGINE>

AC001751AC

ENGINE COOLANT
TEMPERATURE GAUGE UNIT

CONNECTOR: B-07

<3.0L ENGINE>

AC003089 AD

CONNECTOR: C-29

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CHASSIS ELECTRICAL

COMBINATION METERS ASSEMBLY AND VEHICLE SPEED SENSOR

54A-60

STEP 4. Check the harness wires between engine coolant
temperature sensor connector B-07 and combination
meter connector C-29.
NOTE: After checking intermediate connector C-17, check the
wire. If intermediate connector C-17 is damaged, repair or
replace it. Refer to GROUP 00E, Harness Connector
Inspection

P.00E-2

.

Q: Are the harness wires between engine coolant

temperature sensor connector B-07 and combination
meter connector C-29 in good condition?
YES : Repair or replace the combination meter (printed-

circuit board or engine coolant temperature gauge
assembly). The engine coolant temperature gauge
should work normally.

NO : Repair them. The engine coolant temperature gauge

should work normally.

AC001750AC

ENGINE COOLANT
TEMPERATURE GAUGE UNIT

CONNECTOR: B-07
<2.4L ENGINE>

AC001751AC

ENGINE COOLANT
TEMPERATURE GAUGE UNIT

CONNECTOR: B-07

<3.0L ENGINE>

AC003089 AD

CONNECTOR: C-29

AC003089 AI

CONNECTOR: C-17