Mitsubishi Eclipse. Manual - part 686

 

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Mitsubishi Eclipse. Manual - part 686

 

 

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-25

.

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 tran-
sistor at terminal number 16 of the auto-cruise con-
trol-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

AC101196AD

CONNECTORS: C-03, C-06

C-06

C-03

AC103104AD

CONNECTOR: C-89

CONNECTOR 
BLOCK (LH)

AC101197AB

CONNECTOR: C-94

CONNECTOR 
BLOCK (RH)

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-26

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

backprobing.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage approximately battery positive voltage?

YES : Go to Step 3.
NO :  Go to Step 2.

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 (terminal number 4) by 
backprobing.
(1) Do not disconnect stoplight switch connector C-03.
(2) Turn the ignition switch to the "ON" position and the 

auto-cruise control main switch to the "ON" position.

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

backprobing.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage approximately battery positive voltage?

YES : Go to Step 6.
NO :  Go to Step 4.

1

3

4

2

ACX01910

C-03 CONNECTOR
HARNESS SIDE VIEW

AC

AC101196AE

CONNECTOR: C-03

1

3

4

2

ACX01911AC

C-03 CONNECTOR
HARNESS SIDE VIEW

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-27

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.

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.17-92

.). Then 

check that diagnostic trouble code 14 is not output.

AC101196AE

CONNECTOR: C-03

1

2

3

4

ACX01917

STOPLIGHT SWITCH
CONNECTOR: C-03

AC

AC001463

CONTINUITY

NO
CONTINUITY

4 mm (0.2 in)

AB

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-28

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

connector A-01.

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

auto-cruise control main switch to the "ON" position.

(3) Measure the voltage between terminal 1 and ground by 

backprobing.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage approximately battery positive voltage?

YES : Go to Step 8.
NO :  Go to Step 7.

STEP 7. Check auto-cruise control vacuum pump 
connector A-01 and intermediate connector C-06.
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 stoplight switch 

connector C-03 and auto-cruise control vacuum pump 
connector A-01 for open circuit or damage. Then 
repair if necessary. Then check that diagnostic trouble 
code 14 is not output.

1

2

3

4

ACX01908AC

A-01 CONNECTOR
HARNESS SIDE VIEW

AC001449

CONNECTOR: A-01

RESERVE
TANK

AB

AC101196AB

CONNECTOR: C-06

 

 

 

 

 

 

 

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