Mitsubishi Eclipse. Manual - part 699

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-77

STEP 3. Check the vacuum actuator.
(1) Disconnect the vacuum hose from the vacuum actuator, 

and then connect a hand vacuum pump to the vacuum 
actuator.

(2) Apply a vacuum and check that the throttle lever moves and 

the vacuum is maintained.

Q: Is the vacuum actuator damaged?

YES : Replace the vacuum actuator. For 2.4L engine, refer 

to GROUP 13A, Throttle Body Assembly 

P.13A-946

. 

For 3.0L engine, refer to GROUP 13B, Throttle Body 
Assembly 

P.13B-1117

. 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.

AC001493

THROTTLE BODY

VACUUM ACTUATOR

AB

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-78

INSPECTION PROCEDURE 9: Auto-cruise Control Indicator Light Inside Combination Meter does not 
Illuminate. (However, Auto-cruise Control is Normal.)

Auto-cruise Control Indicator Light Drive Circuit

AC106776AB

AC001451

CONNECTOR: C-20

AB

AC101196AG

CONNECTORS: C-41, C-43

C-41

C-43

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-79

.

CIRCUIT OPERATION
The power for the auto-cruise indicator in the combi-
nation meter is supplied from the ignition switch 
(IG1). When the auto-cruise control system is operat-
ing, the transistor inside the auto-cruise control-ECU 
illuminates the auto-cruise indicator through ECU ter-
minal number 15.

.

TECHNICAL DESCRIPTION (COMMENT)
The cause is probably the malfunction of the indica-
tor bulb or the malfunction of the connector or har-
ness.

.

TROUBLESHOOTING HINTS

• Malfunction of the indicator bulb.

• Damaged harness or connector.

• Malfunction of the auto-cruise control-ECU.

DIAGNOSIS

Required Special Tool:

• MB991223: Harness Set

STEP 1. Check the auto-cruise control indicator bulb.
(1) Remove the combination meter. Refer to GROUP 54A, 

Combination Meter Assembly and Vehicle Speed Sensor 

P.54A-112

.

(2) Check the auto-cruise control indicator bulb.
Q: Is the bulb blown?

YES : Replace the bulb. Then check that the malfunction is 

eliminated.

NO :  Go to Step 2.

STEP 2. Check the output circuit voltage at auto-cruise 
control-ECU connector C-20 (terminal number 15) 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 15 and ground by 

backprobing.

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

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 3.

AC103108AB

CONNECTORS: C-108, C-111

C-108

C-111

JUNCTION BLOCK
(FRONT VIEW)

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

AC103110

C-20 CONNECTOR
HARNESS SIDE VIEW

AB

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-80

STEP 3. Check the output circuit voltage at junction block 
connector C-108 (terminal number 25) by backprobing.
(1) Do not disconnect auto-cruise control switch connector 

C-108.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 25 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 5.
NO :  Go to Step 4.

STEP 4. Check junction block connector C-108.
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 :  Replace the junction block. Then check that the 

malfunction is eliminated.

STEP 5. Check combination meter connector C-41 and 
C-43.
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 6.

AC103111AB

C-108 CONNECTOR
HARNESS SIDE VIEW

AC103108AC

CONNECTOR: C-108

JUNCTION BLOCK
(FRONT VIEW)

AC101196AG

CONNECTORS: C-41, C-43

C-41

C-43