Mitsubishi Galant. Manual — part 364

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-26

STEP 12. 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 harness wire and then check that diagnostic

trouble code 14 is not output.

NO : Check that diagnostic trouble code 14 is not output.

If diagnostic trouble code 14 is output, replace the
auto-cruise control-ECU. (Refer to

P.17-74

.)

Then check that diagnostic trouble code 14 is not
output.

STEP 13. 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 5 and ground by

backprobing.

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

Q: Is the voltage approximately battery positive voltage?

YES : Go to Step 14.
NO : Go to Step 15.

AC001449

CONNECTOR: A-01

RESERVE
TANK

AB

AC004572AB

CONNECTOR: C-52

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

ACX01899

C-52 CONNECTOR
HARNESS SIDE VIEW

AD

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-27

STEP 14. Check intermediate connector C-05.
Q: Is any connector damaged?

YES : Repair or replace connector.

Refer to GROUP 00E, Harness Connector Inspection

P.00E-2

.

Then check that diagnostic trouble code 14 is not
output.

NO : Check the harness wire between auto-cruise control-

ECU connector C-52 and stoplight switch connector
C-03 for open circuit or damage.
Then repair if necessary.
Then check that diagnostic trouble code 14 is not
output.

STEP 15. Check auto-cruise control-ECU connector C-52.
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 14 is not
output.

NO : Check that diagnostic trouble code 14 is not output.

If diagnostic trouble code 14 is output, replace the
auto-cruise control-ECU. (Refer to

P.17-74

.)

Then check that diagnostic trouble code 14 is not
output.

AC004571

CONNECTOR: C-05

COMBINATION METER

AB

AC004572AB

CONNECTOR: C-52

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-28

DTC15 : Auto-cruise Control Switch System

CIRCUIT OPERATION
This circuit judges the signals of each switch ("OFF,"
"SET," "RESUME," "CANCEL" and "MAIN") of the
auto-cruise control switch.

The auto-cruise control-ECU detects the state of the
auto-cruise control switch by sensing the voltages
shown below.

AC004582

Auto-cruise Control Switch System Circuit

AB

AC004572AB

CONNECTOR: C-52

AC004583AB

C-64

C-61

CONNECTORS: C-61, C-64

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-29

•

When all switches are OFF, the ECU detects 3.5

−

5.0 volts.

•

When the "SET" switch is ON, the ECU detects
0.4

−

2.3 volts.

•

When the "RESUME" switch is ON, the ECU
detects 2.3

−

3.5 volts.

•

When the "CANCEL" switch is ON, the ECU
detects 0.4 volts or less.

•

When the main switch is ON, the ECU detects
7.0 volts.

DTC SET CONDITIONS
This code is output when the auto-cruise control
switch "RESUME" switch, "SET" switch or
"CANCEL" switch stays ON.

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

•

Malfunction of the auto-cruise control switch.

•

Malfunction of the clock spring.

•

Damaged harness or connector.

•

Malfunction of the auto-cruise control-ECU

DIAGNOSIS

Required Special Tool:

•

MB991223: Harness Set

STEP 1. Check the 12-Volt supply circuit voltage at auto-
cruise control switch connector C-64.
(1) Disconnect auto-cruise control switch connector C-64 and

measure at the harness side.

(2) Turn the ignition switch to "ON" position.
(3) Measure the voltage between terminal 1 and ground.
(4) Turn the ignition switch to "LOCK" (OFF) position.

Q: Is the voltage approximately battery positive voltage?

YES : Go to Step 5.
NO : Go to Step 2.

STEP 2. Check auto-cruise control switch connector C-64.
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 15 is not
output.

NO : Go to Step 3.

1

2

3

ACX02255AD

AUTO-CRUISE
CONTROL SWITCH
CONNECTOR: C-64

AC004584

CONNECTOR: C-64

AB