Mitsubishi Galant. Manual — part 623

COMBINATION METERS ASSEMBLY AND VEHICLE SPEED SENSOR

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CHASSIS ELECTRICAL

54A-45

Inspection Procedure 2: Tachometer does not work.

AC003971

Tachometer Circuit

AB

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CHASSIS ELECTRICAL

COMBINATION METERS ASSEMBLY AND VEHICLE SPEED SENSOR

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CIRCUIT OPERATION

•

The tachometer power is supplied from the
ignition switch (IG) circuit.

•

For vehicles with 2.4L engine, the tachometer
detects the ignition signal by the engine control
module via the ignition failure sensor.

•

For vehicles with 3.0L engine, the tachometer
detects the ignition signal control via the
distributor assembly.

TECHNICAL DESCRIPTION (COMMENT)
The ignition signal may not be sent from the engine,
or there may be a malfunction in the power supply or
ground circuit.

TROUBLESHOOTING HINTS

•

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

•

Damaged harness wires or connectors

DIAGNOSIS

Required Special Tools:

•

MB991223: Harness Set

•

MB991502: Scan Tool (MUT-II)

AC003693AB

CONNECTOR: B-01
<2.4L ENGINE>

AC003694AB

CONNECTOR: B-27
<3.0L ENGINE>

AC003089

CONNECTOR: C-16

AS

AC003089 AI

CONNECTOR: C-17

AC003089

CONNECTORS: C-29, C-30

AR

C-30

C-29

AC003082 AM

CONNECTORS: C-73, C-78

C-73

C-78

JUNCTION BLOCK
(FRONT VIEW)

COMBINATION METERS ASSEMBLY AND VEHICLE SPEED SENSOR

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CHASSIS ELECTRICAL

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CAUTION

To prevent damage to scan tool MB991502, 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 P0300 output?

YES : Refer to GROUP 13A,Diagnosis

P.13A-5

and

GROUP 13B, Diagnosis

P.13B-4

.

NO : Go to Step 2.

STEP 2. Check the speedometer operation.

Q: Does the speedometer work normally?

YES : Refer to Inspection Procedure 1

P.54A-29

.

NO : Go to Step 3.

STEP 3. Check the combination meter (tachometer)
ground circuit at the combination meter connector C-30.
(1) Disconnect the combination meter connector C-30.
(2) Measure the resistance between terminal 15 and ground.

Q: Is the resistance less than 2 ohms?

YES : Go to Step 5.
NO : Go to Step 4.

AC002883

16PIN

MB991502

AB

AC003719AB

CONNECTOR: C-30

(HARNESS SIDE)

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CHASSIS ELECTRICAL

COMBINATION METERS ASSEMBLY AND VEHICLE SPEED SENSOR

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STEP 4. Check the ignition failure sensor connector B-01
<2.4L engine>, distributor assembly connector B-27 <3.0L
engine>, automatic compressor controller connector C-16
<3.0L engine> and combination meter connector C-30 for
damage.
Q: Is the ignition failure sensor connector B-01 <2.4L

engine>, distributor assembly connector B-27 <3.0L
engine>, automatic compressor controller connector C-
16 <3.0L engine> and combination meter connector C-
30 for damage in good condition?
YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. The tachometer

should work normally.

AC003693AB

CONNECTOR: B-01
<2.4L ENGINE>

AC003694AB

CONNECTOR: B-27
<3.0L ENGINE>

AC003089

CONNECTOR: C-16

AS

AC003089 AH

CONNECTOR: C-30