Mitsubishi Galant. Manual — part 373

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

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INSPECTION PROCEDURE 7: Auto-cruise Control Indicator Light inside Combination Meter does not
Illuminate. (However, Auto-cruise Control is Normal.)

AC004599

Auto-cruise Control Indicator Light Drive Circuit

AB

AC004600

CONNECTORS: C-29, C-30

AB

C-29

C-30

AC004572AB

CONNECTOR: C-52

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

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CIRCUIT OPERATION
The power for the auto-cruise indicator in the
combination meter is supplied from the ignition
switch (IG1).
When the auto-cruise control system is operating,
the transistor inside the auto-cruise control-ECU
illuminates the auto-cruise indicator through ECU
terminal number 15.

TECHNICAL DESCRIPTION (COMMENT)
The cause is probably the malfunction of the
indicator bulb or the malfunction of the connector or
harness.

TROUBLESHOOTING HINTS

•

Malfunction of the indicator bulb.

•

Damaged harness or connector.

•

Malfunction of the auto-cruise control-ECU.

DIAGNOSIS

Required Special Tool:

•

MB991223: Harness Set

STEP 1. Check the auto-cruise control indicator bulb.
(1) Remove the combination meter.

Refer to GROUP 54A, Combination Meter Assembly and
Vehicle Speed Sensor

P.54A-65

.

(2) Check the auto-cruise control indicator bulb.

Q: Is the bulb blown?

YES : Replace the bulb.

Then check that the malfunction is eliminated.

NO : Go to Step 2.

AC004592AB

CONNECTOR: C-73

JUNCTION BLOCK
(FRONT VIEW)

AC004601AB

CONNECTOR: C-78

JUNCTION BLOCK
(FRONT VIEW)

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

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STEP 2. Check the output circuit voltage at auto-cruise
control-ECU connector C-52 by backprobing.
(1) Do not disconnect auto-cruise control-ECU connector C-52.
(2) Turn the ignition switch to "ON" position.
(3) Measure the voltage between terminal 15 and ground by

backprobing.

(4) Turn the ignition switch to "LOCK" (OFF) position.

Q: Is the voltage approximately battery positive voltage?

YES : Check that the malfunction is eliminated.

If the malfunction is eliminated, replace the auto-
cruise control-ECU. (Refer to

P.17-74

.)

Then check that the malfunction is eliminated.

NO : Go to Step 3.

STEP 3. Check the output circuit voltage at junction block
connector C-78 by backprobing.
(1) Do not disconnect junction block connector C-78.
(2) Turn the ignition switch to "ON" position.
(3) Measure the voltage between terminal 6 and ground by

backprobing.

(4) Turn the ignition switch to "LOCK" (OFF) position.

Q: Is the voltage approximately battery positive voltage?

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

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

AC002355

C-52 CONNECTOR
HARNESS SIDE VIEW

AC

AC002391

1 2 3 4

5 6 7 8 9

10 1112 1314 15 16 1718 19 20

C-78 CONNECTOR
HARNESS SIDE VIEW

AC

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

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STEP 4. Check junction block connector C-73.
Q: Is the connector damaged?

YES : Repair or replace connector.

Refer to GROUP 00E, Harness Connector Inspection

P.00E-2

.

Then check that the malfunction is eliminated.

NO : Replace the junction block.

Then check that the malfunction is eliminated.

STEP 5. Check combination meter connector C-29 and C-
30.
Q: Is any connector damaged?

YES : Repair or replace connector.

Refer to GROUP 00E, Harness Connector Inspection

P.00E-2

.

Then check that the malfunction is eliminated.

NO : Go to Step 6.

STEP 6. Check the harness wire between combination
meter connector C-29 and junction block connector C-78.
Q: Is any harness wire between combination meter

connector C-29 and junction block connector C-78
damaged?
YES : Repair the harness wire and then check that the

malfunction is eliminated.

NO : Go to Step 7.

AC004592AB

CONNECTOR: C-73

JUNCTION BLOCK
(FRONT VIEW)

AC004600

CONNECTORS: C-29, C-30

AB

C-29

C-30

AC004602

CONNECTOR: C-29

AB

AC004601AB

CONNECTOR: C-78

JUNCTION BLOCK
(FRONT VIEW)