Mitsubishi Montero Sport (2004+). Manual — part 103

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-7

AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS

INTRODUCTION TO AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS

M1172003300198

The auto-cruise control system allows driving without
stepping on the accelerator pedal by setting a ran-
dom speed between 40 km/h (25 mph) and 200 km/h
(124 mph).
Troubles in this system can be investigated by the
following methods.

.

Auto-cruise control system diagnostic trouble
codes
The auto-cruise control system consists of the
auto-cruise control-ECU, control switches, sensors,
and vacuum pump. If the auto-cruise control-ECU
detects a problem on any of those components, the
ECU estimates where the problem may be occurring,
and will output a diagnostic trouble code.

The control switches and sensors monitor the state
of the vehicle.
Based on input signals from those switches and sen-
sors, the auto-cruise control-ECU activates the vac-
uum pump.
Diagnostic trouble codes cover the throttle position
sensor, auto-cruise control switch, vehicle speed
sensor, auto-cruise control-ECU and vacuum pump.

AUTO-CRUISE CONTROL SYSTEM DIAGNOSTIC TROUBLESHOOTING STRATEGY

M1172002000202

Use these steps to plan your diagnostic strategy.
If you follow them carefully, you will check most of
the possible causes of an auto-cruise control system
problem.
1. Gather information from the customer.
2. Verify that the condition described by the

customer exists.

3. Check the vehicle for any auto-cruise control

system DTC.

4. If you can verify the condition and there are no

auto-cruise control system DTCs, and the
malfunction is intermittent, refer to GROUP 00,
How to Use Troubleshooting/Inspection Service
Points

− How to Cope with Intermittent

Malfunctions

P.00-7

.

5. If you can verify the condition but there are no

auto-cruise control system DTCs, or the system
cannot communicate with the scan tool, check
that the auto-cruise control system is operating
properly.

• If the auto-cruise control system is operating

properly, refer to

P.17-91

, Auto-cruise Control

System Data List Reference Table.

• If the auto-cruise control system is operating

properly, refer to

P.17-11

, Auto-cruise Control

System Diagnostic Trouble Code Chart.

6. If there is an auto-cruise control system DTC,

record the number of the code, then erase the
code from vehicle memory using the scan tool.

7. Re-create the auto-cruise control system DTC set

conditions to see if the same Auto-cruise Control
System DTC will set again.

• If the same Auto-cruise Control System DTC sets

again, perform the diagnostic procedures for the
set code. Refer to

P.17-11

, Auto-cruise Control

System Diagnostic Trouble Code Chart.

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-8

AUTO-CRUISE CONTROL SYSTEM DIAGNOSTIC
FUNCTION

M1172004900096

HOW TO CONNECT THE SCAN TOOL (MUT-III).

Required Special Tools:

• MB991958: Scan tool (MUT-III sub assembly)

• MB991824: Vehicle communication interface (V.C.I.)

• MB991827: MUT-III USB cable

• MB991911: MUT-III main harness B

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
1. Ensure that the ignition switch is at the "LOCK" (OFF)

position.

2. Start up the personal computer.
3. Connect special tool MB991827 to special tool MB991824

and the personal computer.

4. Connect special tool MB991911 to special tool MB991824.
5. Connect special tool MB991911 to the data link connector.
6. Turn the power switch of special tool MB991824 to the "ON"

position.
NOTE: When special tool MB991824 is energized, special
tool MB991824 indicator light will be illuminated in green
color.

7. Start the MUT-III system on the personal computer.

NOTE: Disconnecting scan tool MB991958 is the reverse of
the connecting sequence, making sure that the ignition
switch is at the "LOCK" (OFF) position.

AK303629AB

MB991911

MB991827

MB991824

16-PIN

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-9

HOW TO READ AND ERASE DIAGNOSTIC
TROUBLE CODES

.

Using scan tool (MUT-III)

Required Special Tools:

• MB991958: Scan tool (MUT-III sub assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB cable

• MB991911: MUT-III main harness B

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.

NOTE: If the battery voltage is low, diagnostic trouble codes
will not be set. Check the battery if scan tool MB991958
does not display.

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "Interactive Diagnosis" from the start-up screen.
4. Select "System Select."
5. Choose "AUTO-CRUISE" from the "POWERTRAIN" tab.
6. Select "Diagnostic Trouble Code."
7. If a DTC is set, it is shown.
8. Choose "DTC erase" to erase the DTC.

.

Using a Auto-cruise Control Indicator Light
1. Turn the ignition switch to the "ON" position while holding

the auto-cruise control switch in the "SET" (down) position.
Then, within one second, more the cruise control switch up
to the "RES" position.

2. Read a diagnostic trouble code by observing the flash

display pattern of the auto-cruise control indicator light in the
combination meter.

.

AK303629AB

MB991911

MB991827

MB991824

16-PIN

ACX01172

AB

AUTO-CRUISE
CONTROL
SWITCH

SET
SWITCH: ON

RESUME
SWITCH: ON

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-10

DIAGNOSTIC RESULT DISPLAY METHOD WHEN USING THE AUTO-CRUISE CONTROL INDICATOR
LIGHT

NOTE: Other on-board diagnostic items are also output as voltage waveforms corresponding to diagnostic
trouble code numbers.

HOW TO READ DATA LIST

Required Special Tools:

• MB991958: Scan tool (MUT-III sub assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB cable

• MB991911: MUT-III main harness B

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "Interactive Diagnosis" from the start-up screen.
4. Select "System Select."
5. Choose "AUTO-CRUISE" from the "POWERTRAIN" tab.
6. Select "Data List."
7. Choose an appropriate item.

WHEN THE DIAGNOSTIC TROUBLE CODE NO.14 IS SET

WHEN NO DIAGNOSTIC TROUBLE CODE
IS SET

ACX01173

12V

0V

PAUSE
TIME: 3 s

TEN-
DIGIT

DIGIT
DIVISION:
2 s

FIRST DIGIT

0.5 s

1 s

AB

ACX01174 AB

12V

0V

0.5 s

CONTINUOUS ON AND OFF
SIGNALS AT INTERVALS OF 0.5 s

AK303629AB

MB991911

MB991827

MB991824

16-PIN