Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 374

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-20.
Q: Is any harness wire between auto-cruise control

vacuum pump connector A-01 and auto-cruise control-
ECU connector C-20 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.17-81

.)

Then check that diagnostic trouble code 11 is not
output.

AC001449

CONNECTOR: A-01

RESERVE
TANK

AB

AC001451

CONNECTOR: C-20

AB

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-16

DTC 12: Vehicle Speed Sensor System

AC005109

Vehicle Speed Sensor System Circuit

AB

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

AC003550 AC

CONNECTORS: B-36, B-39 <2.4 L>

B-36 <M/T>

B-39 <M/T>

B-39 <A/T>

AC003599 AB

CONNECTOR: C-28

AC003553 AI

CONNECTOR: C-78

AC001451

CONNECTOR: C-20

AB

AC003553 AH

CONNECTOR: C-77

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-18

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-30

.)

STEP 2. Check joint connector (1) C-77.
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.

STEP 3. Check the harness wire between auto-cruise
control-ECU connector C-20 and joint connector (1) C-77.
Q: Is any harness wire between auto-cruise control-ECU

connector C-20 and joint connector (1) C-77 damaged?
YES : Repair the harness wire and then check that

diagnostic trouble code 12 is not output.

NO : Check that diagnostic trouble code 12 is not output.

If diagnostic trouble code 12 is output, replace the
auto-cruise control-ECU. (Refer to

P.17-81

.)

Then check that diagnostic trouble code 12 is not
output.

AC003553 AH

CONNECTOR: C-77

AC001451

CONNECTOR: C-20

AB

AC003553 AH

CONNECTOR: C-77