Mitsubishi Galant. Manual — part 360

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-10

INSPECTION USING SCAN TOOL MB991502,
DATA LIST

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. Carry out inspection by means of the data list.

If there is an abnormality, check and repair the chassis
harnesses and components. (Refer to

P.17-67

, Data List

Reference Table.)

4. Re-check using scan tool MB991502 and check to be sure

that the abnormal input and output have returned to normal
because of the repairs.

5. Erase the diagnostic trouble code(s).

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

7. Disconnect scan tool MB991502 from the data link

connector.

8. Start the engine again and do a test drive to confirm that the

problem is eliminated.

DIAGNOSTIC TROUBLE CODE CHART

M1172002200057

Check according to the inspection chart that is
appropriate for the diagnostic trouble code.

AC004569

MB991502

16 PIN

AB

DIAGNOSTIC TROUBLE
CODE NO.

INSPECTION ITEM

REFERENCE PAGE

11

Auto-cruise vacuum pump drive system

P.17-11

12

Vehicle speed sensor system

P.17-16

14

Stoplight switch system

P.17-19

15

Auto-cruise control switch system

P.17-28

16

Auto-cruise control-ECU system

P.17-33

17

Throttle position sensor system

P.17-34

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-11

DIAGNOSTIC TROBLE CODE PROCEDURES

DTC 11: Auto-cruise Vacuum Pump Drive System

AC004570

Auto-cruise Vacuum Pump Drive System Circuit

AB

AC001449

CONNECTOR: A-01

RESERVE
TANK

AB

AC004571

CONNECTOR: C-05

COMBINATION METER

AB

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-12

CIRCUIT OPERATION
This circuit activates the vacuum pump used to
accelerate/decelerate, set, and cancel the vehicle
speed.
The auto-cruise control-ECU controls the control
valve, release valve, and motor by turning the
transistor in the ECU on and off.

DTC SET CONDITIONS
Any drive signal for the release valve, control valve
or motor is not input to the auto-cruise control-ECU.

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

•

Malfunction of the auto-cruise vacuum pump.

•

Damaged harness or connector.

•

Malfunction of the auto-cruise control-ECU.

DIAGNOSIS

Required Special Tool:

•

MB991223: Harness Set

STEP 1. Check the output circuit voltage at auto-cruise
control-ECU connector C-52 by backprobing.
(1) Do not disconnect auto-cruise control-ECU connector C-52.
(2) Turn the ignition switch to "ON" position and the auto-cruise

control main switch to "ON" position.

(3) Measure the voltage between terminal 7 and ground by

backprobing.

•

Voltage should be battery positive voltage.
[When decelerating with the "SET" switch while driving
at constant speed (Release valve open).]

(4) Measure the voltage between terminal 8 and ground by

backprobing.

•

Voltage should be battery positive voltage.
[When decelerating with the "SET" switch while driving
at constant speed. (Control valve open).]

(5) Measure the voltage between terminal 16 and ground by

backprobing.

•

Voltage should be battery positive voltage.
(When the motor is stopped during a constant road
speed.)

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

Q: Are all of the above values satisfied?

YES : 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.

NO : Go to Step 2.

AC004573AC

GLOVE BOX

CONNECTOR: C-12

AC004572AB

CONNECTOR: C-52

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

ACX01897

C-52 CONNECTOR
HARNESS SIDE VIEW

AD

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-13

STEP 2. Check auto-cruise control-ECU connector C-52
and intermediate connector C-12.
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 11 is not
output.

NO : Go to Step 3.

STEP 3. Check auto-cruise control vacuum pump
connector A-01.
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 11 is not
output.

NO : Go to Step 4.

AC004572AB

CONNECTOR: C-52

AC004573AC

GLOVE BOX

CONNECTOR: C-12

AC001449

CONNECTOR: A-01

RESERVE
TANK

AB