Mitsubishi Galant. Manual — part 362

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-18

STEP 3. Check the harness wire between auto-cruise
control-ECU connector C-52 and joint connector (2) C-56.
Q: Is any harness wire between auto-cruise control-ECU

connector C-52 and joint connector (2) C-56 damaged?
YES : Repair the harness wire and then check that

diagnostic trouble code 12 is not output.

NO : Check that diagnostic trouble code 12 is not output.

If diagnostic trouble code 12 is output, replace the
auto-cruise control-ECU. (Refer to

P.17-74

.)

Then check that diagnostic trouble code 12 is not
output.

AC004572AB

CONNECTOR: C-52

AC004577AB

CONNECTOR: C-56

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-19

DTC14 : Stoplight Switch System

AC004578AB

Stoplight Switch System Circuit

AC001449

CONNECTOR: A-01

RESERVE
TANK

AB

AC004579

CONNECTORS: C-03, C-05

AB

C-03

C-05

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-20

CIRCUIT OPERATION
This circuit supplies the power to the vacuum pump.
The battery positive voltage is supplied to the auto-
cruise control vacuum pump by turning on the
transistor at terminal number 16 of the auto-cruise
control-ECU.
The conditions for turning on the transistor at
terminal number 16 of the auto-cruise control-ECU
are as follows.

•

Ignition switch "ON"

•

Auto-cruise control main switch "ON"

•

Stoplight switch ON

DTC SET CONDITIONS
None of the drive signals from release valve, control
valve and motor of the auto-cruise vacuum pump are
input to the auto-cruise control-ECU.

TROUBLESHOOTING HINTS
The most likely causes for this code to be set are:

•

Malfunction of the stoplight switch

•

Malfunction of the auto-cruise vacuum pump

•

Damaged harness or connector.

•

Malfunction of the auto-cruise control-ECU

DIAGNOSIS

Required Special Tool:

•

MB991223: Harness Set

STEP 1. Check the output circuit voltage at stoplight
switch connector C-03 by backprobing.
(1) Do not disconnect stoplight switch connector C-03.
(2) Turn the ignition switch to "ON" position.
(3) Measure the voltage between terminal 3 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 3.
NO : Go to Step 2.

AC004573AC

GLOVE BOX

CONNECTOR: C-12

AC004580AB

CONNECTOR: C-66

CONNECTOR
BLOCK(LH)

AC004572AB

CONNECTOR: C-52

1

3

4

2

ACX01910

C-03 CONNECTOR
HARNESS SIDE VIEW

AC

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-21

STEP 2. Check stoplight switch connector C-03.
Q: Is the connector damaged?

YES : Repair or replace connector.

Refer to GROUP 00E, Harness Connector Inspection

P.00E-2

.

Then check that diagnostic trouble code 14 is not
output.

NO : Go to Step 13.

STEP 3. Check the output circuit voltage at stoplight
switch connector C-03 by backprobing.
(1) Do not disconnect stoplight switch connector C-03.
(2) Turn the ignition switch to "ON" position and the auto-cruise

control main switch to "ON" position.

(3) Measure the voltage between terminal 4 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 6.
NO : Go to Step 4.

STEP 4. Check stoplight switch connector C-03.
Q: Is the connector damaged?

YES : Repair or replace connector.

Refer to GROUP 00E, Harness Connector Inspection

P.00E-2

.

Then check that diagnostic trouble code 14 is not
output.

NO : Go to Step 5.

AC004581

CONNECTOR: C-03

AB

1

3

4

2

ACX01911AC

C-03 CONNECTOR
HARNESS SIDE VIEW

AC004581

CONNECTOR: C-03

AB