Mitsubishi Galant 9G. Manual — part 448

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-10

CONSTRUCTION DIAGRAM

AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS

INTRODUCTION TO AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS

M1172003300251

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). Problems in this system can be investi-
gated by the following methods.

Auto-cruise control system diagnostic
trouble codes

The auto-cruise control system consists of the pow-
ertrain control module (PCM), control switches and
sensors. The control switches and sensors monitor
the state of the vehicle. The PCM controls the throttle
valve opening angle in the throttle body in accor-

dance with the input signals from the switches and
sensors. If the PCM detects a problem on any of
those components, the PCM estimates where the
problem may be occurring, and will set a diagnostic
trouble code. Diagnostic trouble codes cover the
auto-cruise control switch, stoplight switch and PCM.

AC305704

AC206195

AC305701

AC305702

9 10 11 12 13 14 15 16

1

2 3

4 5 6 7 8

AC305703

AB

STOPLIGHT SWITCH

PCM

TRANSMISSION
RANGE SWITCH

THROTTLE BODY
(BUILT-IN THROTTLE
POSITION SENSOR
AND THROTTLE
ACTUATOR CONTROL
MOTOR)

"CRUISE" INDICATOR
LIGHT

AUTO-CRUISE
CONTROL SWITCH

DATA LINK
CONNECTOR

ACCELERATOR PEDAL
(BUILT-IN ACCELERATOR
PEDAL POSITION SENSOR)

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

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DIAGNOSTIC TROUBLESHOOTING STRATEGY

M1172002000484

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. (Refer to

P.17-11

, Diagnostic

Function

− How to Read and Erase Diagnostic

Trouble Codes).

4. If you can verify the condition but no auto-cruise

control system DTCs are set, the malfunction may
be intermittent. (Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How

to Cope with Intermittent Malfunctions

P.00-14

).

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

auto-cruise control system DTCs, or the system
cannot communicate with scan tool MB991958
(MUT-III sub assembly), and find the fault. (Refer
to

P.17-54

, Symptom Chart).

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

record the number of the code, then erase the
code from PCM memory using the scan tool
MB991958 (MUT-III sub assembly). (Refer to

P.17-11

, Diagnostic Function

− How to Read and

Erase Diagnostic Trouble Codes).

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

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

P.17-11

,

Diagnostic Function

− How to Read and Erase

Diagnostic Trouble Codes).

• If the same Auto-cruise Control System DTC sets

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

P.17-14

, Diagnostic Trouble

Code Chart).

DIAGNOSTIC FUNCTION

M1172004900171

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

• MB991910: MUT-III Main Harness A

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 MB991910 to special tool MB991824.
5. Connect special tool MB991910 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.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

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HOW TO READ AND ERASE DIAGNOSTIC
TROUBLE CODES

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

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. Depress the "CRUISE" (MAIN) switch to illuminate the

"CRUISE" indicator light in the combination meter.

4. Select the "Interactive Diagnosis" from the start-up screen.
5. Select the "System Select."
6. Choose the "Auto-cruise Control System" from the

"POWERTRAIN" tab.

7. Select the "Diagnostic Trouble Code."
8. If a DTC is set, it is shown.
9. Choose the "DTC erase" to erase the DTC.
10.Turn the ignition switch to the "LOCK" (OFF) position.
11.Disconnect scan tool MB991958.

HOW TO READ DATA LIST

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

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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 the "Interactive Diagnosis" from the start-up screen.
4. Select the "System Select."
5. Choose the "Auto-cruise Control System" from the

"POWERTRAIN" tab.

6. Select the "Data List."
7. Choose an appropriate item.
8. Turn the ignition switch to the "LOCK" (OFF) position.
9. Disconnect scan tool MB991958.

HOW TO DIAGNOSE THE CAN BUS LINE

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

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 the "CAN bus diagnosis" from the start-up screen.
4. When the vehicle information is displayed, confirm that it

matches the vehicle whose CAN bus lines will be

diagnosed.

• If the information is correct, go to step 8.

• If not, go to step 5.

5. Select the "view vehicle information" button.
6. Enter the vehicle information and select the "OK" button.
7. When the vehicle information is displayed, confirm again

that it matches the vehicle which is diagnosed CAN bus line.

• If they match, go to step 8.

• If not, go to step 5.

8. Press the "OK" button.
9. When the optional equipment screen is displayed, choose

the one which the vehicle is fitted with, and then select the

"OK" button.

10.Turn the ignition switch to the "LOCK" (OFF) position.
11.Disconnect scan tool MB991958.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827