Mitsubishi Galant. Manual — part 359

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-6

AU TO -C R U ISE CO NTR O L

GENERAL INFORMATION

M1172000100065

By using the auto-cruise control, the driver can drive
at the desired speed [in a range of approximately 40

−

200 km/h (25

−

124 mph)] without depressing the

accelerator pedal.

CONSTRUCTION DIAGRAM

SPECIAL TOOLS

M1172000600059

AC004568

STOPLIGHT
SWITCH

VACUUM
ACTUATOR

AUTO-CRUISE
VACUUM PUMP
ASSEMBLY

PARK/NEUTRAL
POSITION SWITCH

VEHICLES SPEED
SENSOR

AUTO-CRUISE
CONTROL-ECU

AUTO-CRUISE
CONTROL SWITCH

MAIN SWITCH

AUTO-CRUISE CONTROL
INDICATOR LIGHT

AB

THROTTLE
POSITION
SENSOR

TOOL

TOOL NUMBER AND
NAME

SUPERSESSION

APPLICATION

MB991502
Scan tool (MUT-II)

MB991496-OD

Diagnostic trouble code
check.

MB991529
Diagnostic trouble code
check harness

Tool not necessary if scan
tool (MUT-II) is available

B991502

MB991529

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

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AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS

INTRODUCTION TO AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS

M1172003300057

The auto-cruise control system allows driving without
stepping on the accelerator pedal by setting a
random speed between 40 km/h (25 mph) and 200
km/h (124 mph).
Problems 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.
The control switches and sensors monitor the state
of the vehicle.

Based on input signals from those switches and
sensors, the auto-cruise control-ECU activates the
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.
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

M1172002000053

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.00-8

.

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 Auto-cruise Control System
Data List Reference Table.

•

If the auto-cruise control system is operating
properly, refer to 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 Auto-cruise Control System
Diagnostic Trouble Code Chart.

AUTO-CRUISE CONTROL SYSTEM DIAGNOSTIC
TROUBLE CODE DIAGNOSIS

M1172002100050

Retrieving Auto-cruise Control System Diagnostic Trouble
Codes.

Using scan tool MB991502

Required Special Tool:

•

MB991502: Scan Tool (MUT-II)

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-8

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
1. Connect scan tool MB991502 to the data link connector.

2. Turn the ignition switch to "ON" position.

3. Use scan tool MB991502 to check for auto-cruise control

system diagnostic trouble codes.

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

5. Disconnect scan tool MB991502.

Using a Auto-cruise Control Indicator Light

1. Turn the ignition switch to "ON" position while holding the

auto-cruise control switch in the "SET" position (down).
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.

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.

AC004569

MB991502

16 PIN

AB

ACX01172

AB

AUTO-CRUISE
CONTROL
SWITCH

SET
SWITCH: ON

RESUME
SWITCH: ON

WHEN THE DIAGNOSTIC TROUBLE CODE NO.14 IS
OUTPUT

WHEN NO DIAGNOSTIC TROUBLE
CODE IS OUTPUT

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

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

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Erasing Diagnostic Trouble Codes

The diagnostic trouble codes can be erased by the following
procedure.

NOTE: The diagnostic trouble code will not be erased even if
the negative battery terminal is disconnected.

Using scan tool MB991502

Required Special Tool:

•

MB991502: Scan Tool (MUT-II)

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
1. Connect scan tool MB991502 to the data link connector.

2. Turn the ignition switch to "ON" position.

3. Use scan tool MB991502 to check for auto-cruise control

system diagnostic trouble codes.

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

5. Disconnect scan tool MB991502.

Without using scan tool MB991502

1. Turn the ignition switch to "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. Check to make sure the "CRUISE" light on the instrument

panel is flashing.

3. Put the auto-cruise control switch in the "SET" (down)

position.
Depress the brake pedal and hold for five seconds or more.
Release the brake pedal, auto-cruise control switch, then
turn the ignition switch to "LOCK" (OFF) position.
The DTC(s) are now erased.

AC004569

MB991502

16 PIN

AB

ACX02250

AUTO-CRUISE
CONTROL SWITCH

RESUME SWITCH:
ON

SET SWITCH:
ON

BRAKE PEDAL

ON POSITION

STOPLIGHT SWITCH

AB