Mitsubishi Montero Sport (2004+). Manual — part 107

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-23

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 termi-
nal 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. Measure the output circuit voltage at stoplight
switch connector C-66 by backprobing.
(1) Do not disconnect stoplight switch connector C-66.
(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between stoplight switch connector

C-66 terminal 4 and ground by backprobing.

• The measured voltage should measure battery positive

voltage. (When brake pedal is depressed).

• The measured voltage should measure 0 V. (When

brake pedal is not depressed).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are all of the measured voltage satisfied?

YES : Go to Step 3 .
NO : Go to Step 2 .

AC202157

1
3

4

2

CONNECTOR: C-66

AB

C-66 (B)

C-66:HARNESS SIDE
CONNECTOR

1 2
3 4

AC103615AC

C-66 HARNESS CONNECTOR:
HARNESS SIDE

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-24

STEP 2. Check stoplight switch connector C-66 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is the connector damaged?

YES : Repair or replace the damaged components. (Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

). Then go to Step 19 .

NO : Go to Step 14 .

STEP 3. Measure the output circuit voltage at stoplight
switch connector C-66 by backprobing.
(1) Do not disconnect stoplight switch connector C-66.
(2) Turn the ignition switch to the "ON" position and the

auto-cruise control main switch to the "ON" position.

(3) Measure the voltage between stoplight switch connector

C-66 terminal 1 and ground by backprobing.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage approximately battery positive

voltage?
YES : Go to Step 6 .
NO : Go to Step 4 .

STEP 4. Check stoplight switch connector C-66 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is the connector damaged?

YES : Repair or replace the damaged components. (Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

). Then go to Step 19 .

NO : Go to Step 5 .

AC202157

1
3

4

2

CONNECTOR: C-66

AB

C-66 (B)

C-66:HARNESS SIDE
CONNECTOR

AC202157

1
3

4

2

CONNECTOR: C-66

AB

C-66 (B)

C-66:HARNESS SIDE
CONNECTOR

1 2
3 4

AC103614AC

C-66 HARNESS
CONNECTOR:
HARNESS SIDE

AC202157

1
3

4

2

CONNECTOR: C-66

AB

C-66 (B)

C-66:HARNESS SIDE
CONNECTOR

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-25

STEP 5. Check the stoplight switch.
(1) Disconnect stoplight switch connector C-66.

(2) Connect an ohmmeter to the stoplight switch between

stoplight switch connector C-66 terminals 4 and 1, and
check whether there is continuity when the plunger of the
stoplight switch is pushed in and an open circuit when it is
released.

(3) The stoplight switch is in good condition if there is continuity

when the plunger is pushed in to a depth of within 4 mm
(0.2 inch) from the outer case edge surface, and if the
circuit is open when it is released.

Q: Is the circuit is open?

YES : Replace the stoplight switch. Refer to GROUP 35A,

Brake Pedal

P.35A-27

. Then go to Step 19 .

NO : Go to Step 18 .

AC202157

1
3

4

2

CONNECTOR: C-66

AB

C-66 (B)

C-66:HARNESS SIDE
CONNECTOR

1 2
3 4

AC103617

STOPLIGHT SWITCH
CONNECTOR C-66

CONTINUITY

4 mm (0.2 in)

AB

NO
CONTINUITY

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-26

STEP 6. Measure the output circuit voltage at auto-cruise
control vacuum pump connector A-02 by backprobing.
(1) Do not disconnect auto-cruise control vacuum pump

connector A-02.

(2) Turn the ignition switch to the "ON" position and the

auto-cruise control main switch to the "ON" position.

(3) Measure the voltage between auto-cruise control vacuum

pump connector A-02 terminal 1 and ground by
backprobing.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage approximately battery positive

voltage?
YES : Go to Step 9 .
NO : Go to Step 7 .

STEP 7. Check auto-cruise control vacuum pump
connector A-02 and intermediate connector C-41 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is any connector damaged?

YES : Repair or replace the damaged components. (Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

). Then go to Step 19 .

NO : Go to Step 8

AC202156

3

1 2

4

CONNECTOR:A-02

HYDRAULIC
UNIT

AB

A-02:HARNESS SIDE
CONNECTOR

A-02 (B)

1

2

3

4

ACX01908 AG

A-02 HARNESS CONNECTOR:
HARNESS SIDE

AC202156

3

1 2

4

CONNECTOR:A-02

HYDRAULIC
UNIT

AB

A-02:HARNESS SIDE
CONNECTOR

A-02 (B)

AC202075

22

2021

10

9

8

1718

6 7

19

1415

4 5

1112

1 2 3

13

16

CONNECTOR: C-41

AB

C-41

C-41: MALE SIDE CONNECTOR