Mitsubishi Eclipse. Manual - part 694

 

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Mitsubishi Eclipse. Manual - part 694

 

 

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-57

.

CIRCUIT OPERATION
This is the stoplight switch input signal circuit. The 
signal is sent to the stoplight switch from dedicated 
fuse 5, and is then sent to the auto-cruise con-
trol-ECU.

.

TECHNICAL DESCRIPTION (COMMENT)
The cause is probably a malfunction of the stoplight 
switch circuit.

.

TROUBLESHOOTING HINTS

• Malfunction of the stoplight switch.

• Damaged harness or connector.

• Malfunction of the auto-cruise control-ECU.

DIAGNOSIS

Required Special Tool:

• MB991223: Harness Set

STEP 1. Check if the stoplight illuminates.
Q: Is the stoplight illuminated?

YES : Go to Step 8.
NO :  Go to Step 2.

STEP 2. Check the 12-Volt supply circuit voltage at 
stoplight switch connector C-03 (terminal number 2).
(1) Disconnect stoplight switch connector C-03 and measure at 

the harness side.

(2) Measure the voltage between terminal 2 and ground.
Q: Is the voltage approximately battery positive voltage?

YES : Go to Step 5.
NO :  Go to Step 3.

AC103104AD

CONNECTOR: C-89

CONNECTOR 
BLOCK (LH)

1

2

3

4

ACX01922AC

STOPLIGHT SWITCH
CONNECTOR: C-03

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-58

STEP 3. 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 the malfunction is eliminated.

NO :  Go to Step 4.

STEP 4. Check the harness wire between dedicated fuse 
No.5 and stoplight switch connector C-03 (terminal 
number 2).
Q: Is any harness wire between dedicated fuse No.5 and 

stoplight switch connector C-03 (terminal number 2) 
damaged?
YES : Repair the harness wire and then check that the 

malfunction is eliminated.

NO :  Check that the malfunction is eliminated. If the 

malfunction is not eliminated, replace the auto-cruise 
control-ECU (Refer to 

P.17-92

.). Then check that the 

malfunction is eliminated.

STEP 5. Check the stoplight switch.
(1) Disconnect harness connector C-03 at the stoplight switch.
(2) Connect an ohmmeter to the stoplight switch, and check 

continuity when the plunger of the stoplight switch is 
pushed in and 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 the 
resistance value is less than 2 ohm when it is released.

(4) The check for continuity should be made at terminals 1 and 

2 of the stoplight switch.

Q: Is the circuit open?

YES : Replace the stoplight switch. Refer to GROUP 35A, 

Brake Pedal 

P.35A-31

. Then check that the 

malfunction is eliminated.

NO :  Go to Step 6.

AC101196AE

CONNECTOR: C-03

AC101196AE

CONNECTOR: C-03

AC001478

NO CONTINUITY CONTINUITY

4 mm (0.2 in)

AB

ACX02256AC

STOPLIGHT SWITCH
CONNECTOR: C-03

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-59

STEP 6. Check stoplight switch connector C-03 and 
intermediate connector C-89.
Q: Is any connector damaged?

YES : Repair or replace connector. Refer to GROUP 00E, 

Harness Connector Inspection 

P.00E-2

. Then check 

that the malfunction is eliminated.

NO :  Go to Step 7.

STEP 7. Check the harness wire between stoplight switch 
connector C-03 (terminal number 1) and intermediate 
connector C-89 (terminal number 14).
Q: Is any harness wire between stoplight switch connector 

C-03 (terminal number 1) and intermediate connector 
C-89 (terminal number 14) damaged?
YES : Repair the harness wire and then check that the 

malfunction is eliminated.

NO :  Check that the malfunction is eliminated. If the 

malfunction is not eliminated, replace the auto-cruise 
control-ECU (Refer to 

P.17-92

.). Then check that the 

malfunction is eliminated.

AC101196AE

CONNECTOR: C-03

AC103104AD

CONNECTOR: C-89

CONNECTOR 
BLOCK (LH)

AC101196AE

CONNECTOR: C-03

AC103104AD

CONNECTOR: C-89

CONNECTOR 
BLOCK (LH)

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-60

STEP 8. Check the output circuit voltage at auto-cruise 
control-ECU connector C-20 (terminal number 4) by 
backprobing.
(1) Do not disconnect auto-cruise control switch connector 

C-20.

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

backprobing.

• Voltage should be battery positive volts. (When brake 

pedal is depressed.)

• Voltage should be 0.5 volts or less. (When brake pedal 

is not depressed.)

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage within specifications?

YES : Check that the malfunction is eliminated. If the 

malfunction is not eliminated, replace the auto-cruise 
control-ECU (Refer to 

P.17-92

.). Then check that the 

malfunction is eliminated.

NO :  Go to Step 9.

STEP 9. Check auto-cruise control-ECU connector C-20 
and intermediate connector C-89.
Q: Is the connector damaged?

YES : Repair or replace connector. Refer to GROUP 00E, 

Harness Connector Inspection 

P.00E-2

. Then check 

that the malfunction is eliminated.

NO :  Go to Step 10.

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

AC103175

C-20 CONNECTOR
HARNESS SIDE VIEW

AB

AC001451

CONNECTOR: C-20

AB

AC103104AD

CONNECTOR: C-89

CONNECTOR 
BLOCK (LH)

 

 

 

 

 

 

 

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