Mitsubishi Galant. Manual — part 361

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-14

STEP 4. Check the 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:

•

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

•

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.

•

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.

Q: Are all of the above values satisfied?

YES : Go to Step 5.
No : Replace the auto-cruise vacuum pump. (Refer to

P.17-74

.)

Then check that diagnostic trouble code 11 is not
output.

ACX01181AB

VACUUM
GAUGE

CONTROL
VALVE

RELEASE
VALVE

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-15

STEP 5. Check the harness wire between auto-cruise
control vacuum pump connector A-01 and auto-cruise
control-ECU connector C-52.
Q: Is any harness wire between auto-cruise control

vacuum pump connector A-01 and auto-cruise control-
ECU connector C-52 damaged?
YES : Repair the harness wire and then check that

diagnostic trouble code 11 is not output.

NO : Check that diagnostic trouble code 11 is not output.

If diagnostic trouble code 11 is output, replace the
auto-cruise control-ECU. (Refer to

P.17-74

.)

Then check that diagnostic trouble code 11 is not
output.

AC001449

CONNECTOR: A-01

RESERVE
TANK

AB

AC004572AB

CONNECTOR: C-52

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-16

DTC 12: Vehicle Speed Sensor System

AC004574

Vehicle Speed Sensor System Circuit

AB

AC004575AB

CONNECTOR: B-35

AC004576AB

CONNECTOR: C-17

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-17

CIRCUIT OPERATION
This circuit checks the operation of the vehicle speed
sensor.
When the vehicle moves forward and reverses, the
sensor turns ON and OFF repeatedly.

DTC SET CONDITIONS
The vehicle speed signals from the vehicle speed
sensor are not input to the auto-cruise control-ECU
when the vehicle speed is 40 km/h (25 mph) or more.

TROUBLESHOOTING HINTS
The most likely causes for this code to be set are:

•

Malfunction of the vehicle speed sensor.

•

Damaged harness or connector.

•

Malfunction of the auto-cruise control-ECU.

DIAGNOSIS

Required Special Tool:

•

MB991223: Harness Set

STEP 1. Check the speedometer.

Q: Does the speedometer work normally?

YES : Go to Step 2.
NO : Check the speedometer circuit and repair or replace

as required.
(Refer to GROUP 54A, Combination Meter Assembly
and Vehicle Speed Sensor

P.54A-29

.)

STEP 2. Check joint connector (2) C-56.
Q: Is the connector damaged?

YES : Repair or replace connector.

Refer to GROUP 00E, Harness Connector Inspection

P.00E-2

.

Then check that diagnostic trouble code 12 is not
output.

NO : Go to Step 3

AC004572AB

CONNECTOR: C-52

AC004577AB

CONNECTOR: C-56

AC004577AB

CONNECTOR: C-56