Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 375

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-19

DTC14 : Stoplight Switch System

AC005110AB

Stoplight Switch System Circuit

AC001449

CONNECTOR: A-01

RESERVE
TANK

AB

AC003552 AJ

CONNECTORS: C-03, C-06

C-06

C-03

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-20

CIRCUIT OPERATION
This circuit supplies the power to the vacuum pump.
The battery positive voltage is supplied to the auto-
cruise control vacuum pump by turning on the
transistor at terminal number 16 of the auto-cruise
control-ECU.
The conditions for turning on the transistor at
terminal number 16 of the auto-cruise control-ECU
are as follows.

•

Ignition switch "ON"

•

Auto-cruise control main switch "ON"

•

Stoplight switch ON

DTC SET CONDITIONS
None of the drive signals from release valve, control
valve and motor of the auto-cruise vacuum pump are
input to the auto-cruise control-ECU.

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

•

Malfunction of the stoplight switch

•

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 stoplight
switch connector C-03 by backprobing.
(1) Do not disconnect stoplight switch connector C-03.
(2) Turn the ignition switch to "ON" position.
(3) Measure the voltage between terminal 3 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 3.
NO : Go to Step 2.

AC001451

CONNECTOR: C-20

AB

AC001991AM

CONNECTOR: C-89

CONNECTOR
BLOCK (LH)

AC001992

CONNECTOR: C-94

AF

CONNECTOR
BLOCK (RH)

1

3

4

2

ACX01910

C-03 CONNECTOR
HARNESS SIDE VIEW

AC

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-21

STEP 2. Check stoplight switch connector C-03.
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 : Go to Step 13.

STEP 3. Check the output circuit voltage at stoplight
switch connector C-03 by backprobing.
(1) Do not disconnect stoplight switch connector C-03.
(2) Turn the ignition switch to "ON" position and the auto-cruise

control main switch to "ON" position.

(3) Measure the voltage between terminal 4 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 6.
NO : Go to Step 4.

STEP 4. Check stoplight switch connector C-03.
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 : Go to Step 5.

AC003552 AK

CONNECTOR: C-03

1

3

4

2

ACX01911AC

C-03 CONNECTOR
HARNESS SIDE VIEW

AC003552 AK

CONNECTOR: C-03

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-22

STEP 5. Check the stoplight switch.
(1) Disconnect stoplight switch connector C-03.
(2) Connect an ohmmeter to the stoplight switch between

terminals 3 and 4, and check whether there is continuity
when the plunger of the stoplight switch is pushed in and an
open circuit when it is released.

(3) The stoplight switch is in good condition if the circuit is open

when the plunger is pushed in to a depth of within 4 mm
(0.2 inch) from the outer case edge surface, and if there is
continuity when it is released.

Q: Is the circuit is open?

YES : Replace the stoplight switch.

Refer to GROUP 35A, Brake Pedal

P.35A-31

.

Then check that a 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.17-81

.)

Then check that diagnostic trouble code 14 is not
output.

STEP 6. Check the output circuit voltage at auto-cruise
control vacuum pump connector A-01 by backprobing.
(1) Do not disconnect auto-cruise control vacuum pump

connector A-01.

(2) Turn the ignition switch to "ON" position and the auto-cruise

control main switch to "ON" position.

(3) Measure the voltage between terminal 1 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 8.
NO : Go to Step 7.

1

2

3

4

ACX01917

STOPLIGHT SWITCH
CONNECTOR: C-03

AC

AC001463

CONTINUITY

NO
CONTINUITY

4 mm (0.2 in)

AB

1

2

3

4

ACX01908AC

A-01 CONNECTOR
HARNESS SIDE VIEW