Mitsubishi Galant. Manual — part 619

COMBINATION METERS ASSEMBLY AND VEHICLE SPEED SENSOR

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CHASSIS ELECTRICAL

54A-29

SYMPTOM PROCEDURES

Inspection Procedure 1: Speedometer does not work.

AC003970

Speedometer Circuit

AB

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CHASSIS ELECTRICAL

COMBINATION METERS ASSEMBLY AND VEHICLE SPEED SENSOR

54A-30

CIRCUIT OPERATION

•

The ignition switch (IG1) circuit is the power
source for the speedometer and vehicle speed
sensor.

•

The vehicle speed sensor is installed on the
transaxle. Four pulses are generated with one
turn of the vehicle speed sensor shaft. These
pulse signals are sent into the speedometer. The
speedometer calculates the pulse signals, and
operates the indicator. At the same time, the
travel distance is calculated.

AC003686

CONNECTOR: B-35
<2.4L ENGINE>

AB

AC003687

CONNECTOR: B-35
<3.0L ENGINE>

AB

AC003089

C-17

C-31

CONNECTORS: C-17, C-31

AN

AC003089

C-56

CONNECTORS: C-29, C-30, C-56

AO

C-30

C-29

AC003685

CONNECTOR: C-41

AC

PCM

AC003688

AC003688

CONNECTOR: C-52

AB

CENTER REINFORCEMENT

AUTO-CRUISE CONTROL-ECU

AC003082AV

CONNECTORS: C-73, C-74, C-78

C-73

C-78

JUNCTION BLOCK
(FRONT VIEW)

C-74

COMBINATION METERS ASSEMBLY AND VEHICLE SPEED SENSOR

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CHASSIS ELECTRICAL

54A-31

TECHNICAL DESCRIPTION (COMMENT)
The cause may be a faulty vehicle speed sensor
circuit system or a faulty speedometer. Vehicle
speed sensor is also used by the powertrain control
module (PCM), auto-cruise control-ECU.

TROUBLESHOOTING HINTS

•

Malfunction of the vehicle speed sensor

•

Malfunction of the combination meter (printed-
circuit board or speedometer and tachometer)

•

Malfunction of the PCM

•

Malfunction of the auto-cruise control-ECU

•

Damaged harness wires or connectors

DIAGNOSIS

Required Special Tools:

•

MB991223: Harness Set

•

MB991502: Scan Tool (MUT-II)

CAUTION

To prevent damage to scan tool always turn the ignition
switch to "LOCK" (OFF) position before connecting or
disconnecting scan tool.

STEP 1. Check the vehicle speed sensor
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to "ON" position.
(3) Read the MFI system diagnostic trouble code.

Q: Is MFI system DTC P0500 output?

YES : Go to Step 12.
NO : Go to Step 2.

STEP 2. Check the odometer and trip odometer operation.

Q: Do the odometer and trip odometer work correctly?

YES : Go to Step 9.
NO : Go to Step 3.

STEP 3. Check the combination meter power supply circuit
at the combination meter connector C-29.
(1) Disconnect the combination meter connector C-29.
(2) Turn the ignition switch to "ON" position.
(3) Measure the voltage between terminal 29 and ground.

Q: Is the voltage 12 volts (battery positive voltage) between

terminal 29 and ground?
YES : Go to Step 6.
NO : Go to Step 4.

AC002883

16PIN

MB991502

AB

AC002884AB

CONNECTOR: C-29

(HARNESS SIDE)

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CHASSIS ELECTRICAL

COMBINATION METERS ASSEMBLY AND VEHICLE SPEED SENSOR

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STEP 4. Check the combination meter connector C-29 for
damage.
Q: Is combination meter connector C-29 in good

condition?
YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. The speedometer

should work normally.

STEP 5. Check the harness wires between combination
meter connector C-29 and ignition switch (IG1).
NOTE: After checking junction block connectors C-73 and C-
78, check the wires. If junction block connectors C-73 and C-78
are damaged, repair or replace them. Refer to GROUP 00E,
Harness Connector Inspection

P.00E-2

.

Q: Is the harness wires between combination meter

connector C-29 and ignition switch (IG1) in good
condition?
YES : There is no action to be taken.
NO : Repair them. The speedometer should work normally.

STEP 6. Check the combination meter (speedometer)
ground circuit at the combination meter connector C-29.
(1) Disconnect the combination meter connector C-29.
(2) Measure the resistance between terminal 30 and ground.

Q: Is the resistance value less than 2 ohms?

YES : Repair or repair the combination meter (printed-circuit

board or speedometer and tachometer). The
speedometer should work normally.

NO : Go to Step 7.

AC003089 AD

CONNECTOR: C-29

AC003089 AD

CONNECTOR: C-29

AC003082 AM

CONNECTORS: C-73, C-78

C-73

C-78

JUNCTION BLOCK
(FRONT VIEW)

AC002885

(HARNESS SIDE)

CONNECTOR: C-29

AB