Mitsubishi Galant. Manual - part 375

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-70

ON-VEHICLE SERVICE

AUTO-CRUISE CONTROL SWITCH CHECK

M1172001100068

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

2. Check that the indicator light within the combination meter 

illuminates when the main switch is switched "ON".

AUTO-CRUISE CONTROL SETTING

1. Switch "ON" the main switch.

2. Drive at the desired speed, above approximately 40 km/h. 

(25 mph)

3. Push the auto-cruise control switch in the direction of arrow.

4. Check to be sure that when the switch is released the speed 

is the desired constant speed.

NOTE: If the vehicles speed decreases to approximately 15 
km/h (9 mph) below the set speed because of climbing a hill 
for example, the auto-cruise control will be cancelled.

SPEED-INCREASE SETTING

1. Set to the desired speed.

2. Push the auto-cruise control switch in the direction of arrow.

3. Check to be sure that acceleration continues while the 

switch is held, and that after it is released the constant 
speed at the time when it was released becomes the driving 
speed.

NOTE: Acceleration can be continued even if the vehicle 
speed has passed the high-speed limit [approximately 200 
km/h (124 mph)]. 
But the speed when the auto-cruise control switch is 
released will be recorded as the high-speed limit.

AC004605

AUTO-CRUISE
INDICATOR LIGHT

AB

ACX01172

AD

ACX01172

AE

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-71

SPEED-REDUCTION SETTING

1. Set to the desired speed.

2. Push the auto-cruise control switch in the direction of arrow.

3. Check to be sure that deceleration continues while the 

switch is pressed, and that after it is released the constant 
speed at the time when it was released becomes the driving 
speed.

NOTE: When the vehicle speed reaches the low limit 
[approximately 40 km/h (25 mph)] during deceleration, the 
auto-cruise control will be cancelled.

RETURN TO THE SET SPEED BEFORE 
CANCELLATION AND AUTO-CRUISE CONTROL 
CANCELLATION

1. Set the auto-cruise speed control.

2. When any of the following operations are performed while at 

constant speed during auto-cruise control, check if normal 
driving is resumed and deceleration occurs.

(1) The auto-cruise control switch is pushed in the direction 

of arrow.

(2) The brake pedal is depressed.
(3) The selector lever is moved to the "N" range. 

3. At a vehicle speed of 40 km/h (25 mph) or higher, check if 

when the "RESUME" switch is switched "ON," the vehicle 
speed returns to the speed before auto-cruise control driving 
was cancelled, and constant speed driving occurs.

4. When the main switch is turned to "OFF" while driving at 

constant speed, check if normal driving is resumed and 
deceleration occurs. 

AUTO-CRUISE CONTROL SYSTEM COMPONENT 
CHECK

M1172001700060

STOPLIGHT SWITCH

1. Disconnect the connector.

2. Check for continuity between the terminals of the switch.

ACX01172

AD

ACX01172

AG

MEASUREMENT
 CONDITIONS

TERMINAL 
CONNECTOR 
OF TESTER

SPECIFIED 
CONDITION

When brake pedal is 
depressed. (for stoplight 
circuit)

1 

−

 2

Continuity

3 

−

 4

No continuity

When brake pedal is not 
depressed. (for auto-
cruise control circuit)

1 

−

 2

No continuity

3 

−

 4

Continuity

ACX01180 AB

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-72

PARK/NEUTRAL POSITION SWITCH
 ("N" POSITION)

Refer to GROUP 23A, On-vehicle Service 

−

 Essential Service 

P.23A-278

.

THROTTLE POSITION SENSOR

For 2.4L engine, refer to GROUP 13A, On-vehicle Service 

−

 

Throttle Position Sensor Check 

P.13A-444

.

For 3.0L engine, refer to GROUP 13B, On-vehicle Service 

−

 

Throttle Position Sensor Check 

P.13B-524

.

AUTO-CRUISE VACUUM PUMP

1. Disconnect the vacuum hose from the auto-cruise vacuum 

pump and connect a vacuum gauge to the vacuum pump.

2. Disconnect the vacuum pump connector.

3. Check the auto-cruise vacuum pump and valves according 

to the following procedure:

(1) Connect the positive battery terminal to auto-cruise 

vacuum pump connector terminal 1, and the negative 
battery terminal to terminals 2, 3, and 4. 
Then the vacuum gauge should read 27 kPa (8.0 in Hg) 
or more.

(2) The vacuum should be maintained when terminal 4 is 

disconnected from the negative battery terminal while 
terminals 1, 2, and 3 remain connected. 
Then the vacuum gauge should read 0 kPa (0 in Hg) 
when terminal 2 is disconnected from the negative 
battery terminal while terminals 1, and 3 remain 
connected.

(3) The vacuum should be maintained when terminal 4 is 

disconnected from the negative battery terminal while 
terminals 1, 2, and 3 remain connected. 
Then the vacuum gauge should read 0 kPa (0 in Hg) 
when terminal 3 is disconnected from the negative 
battery terminal while terminals 1, and 2 remain 
connected.

VACUUM ACTUATOR

1. Disconnect the vacuum hose from the vacuum actuator, and 

connect a hand vacuum pump to the actuator.

2. Check that the throttle lever operates when applying 

vacuum, and the vacuum is maintained.

ACX01181AB

VACUUM 
GAUGE

CONTROL
VALVE

RELEASE
VALVE

AC001493

THROTTLE BODY

VACUUM ACTUATOR

AB

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-73

AUTO-CRUISE CONTROL CHECK

Measure the resistance between the terminals when each of 
the "SET," "RESUME," "CANCEL" and "MAIN" switches is 
pressed. If the values measured at the time correspond to 
those in the table below, the resistance values are correct.

VEHICLE SPEED SENSOR CHECK

Refer to GROUP 54A, Combination Meters Assembly and 
Vehicle Speed Sensor 

P.54A-65

.

SWITCH 
POSITION

RESISTANCE BETWEEN TERMINALS

"MAIN" switch 
"OFF"

Terminals 1 and 2 Less than 2 ohm

"MAIN" switch 
"ON"

Terminals 1 and 2 Approximately 3.9 k

Ω

"CANCEL" switch 
ON

Terminals 2 and 3 Approximately 0 

Ω

"RESUME" 
switch ON

Terminals 2 and 3 Approximately 910 

Ω

"SET" switch ON

Terminals 2 and 3 Approximately 220 

Ω

ACX01178 AB

OFF

OFF

OFF

OFF

ON

ON

ON

ON

CAN

MAIN

RES

SET

1

2

3