Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 380

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-39

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: Communication with Scan Tool MB991502 is not Possible
(Communication with the Auto-cruise Control-ECU only is not Possible.)

AC005113

Auto-cruise Control-ECU Supply, Ground and Data Link Circuit

AB

AC001451

CONNECTOR: C-20

AB

AC003599 AC

CONNECTOR: C-29

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

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CIRCUIT OPERATION
Power of the auto-cruise control-ECU is transmitted
from the ignition switch (IG1) to the auto-cruise
control-ECU through multi-purpose fuse 13 in the
junction block.

TECHNICAL DESCRIPTION (COMMENT)
The cause is probably a malfunction of the auto-
cruise control-ECU power supply circuit or the auto-
cruise control-ECU ground circuit.

TROUBLESHOOTING HINTS

•

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 auto-cruise
control-ECU connector C-20 by backprobing.
(1) Do not disconnect auto-cruise control switch connector C-

20.

(2) Turn the ignition switch to "ON" position.
(3) Measure the voltage between terminal 6 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 5.
NO : Go to Step 2.

AC001995 AN

CONNECTOR: C-101

JUNCTION BLOCK
(FRONT VIEW)

AC001995AU

CONNECTOR: C-107

JUNCTION BLOCK
(FRONT VIEW)

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

ACX01902AE

C-20 CONNECTOR
HARNESS SIDE VIEW

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

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STEP 2. Check auto-cruise control-ECU connector C-20.
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 3.

STEP 3. Check junction block connector C-101 and C-107.
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 4.

STEP 4. Check the harness wire between ignition switch
and auto-cruise control-ECU connector C-20.
Q: Is any harness wire between ignition switch and auto-

cruise control-ECU connector C-20 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 eliminated, replace the auto-
cruise control-ECU. (Refer to

P.17-81

.)

Then check that the malfunction is eliminated.

AC001451

CONNECTOR: C-20

AB

AC001995 AN

CONNECTOR: C-101

JUNCTION BLOCK
(FRONT VIEW)

AC001995AU

CONNECTOR: C-107

JUNCTION BLOCK
(FRONT VIEW)

AC001451

CONNECTOR: C-20

AB

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-42

STEP 5. Check the ground circuit voltage at auto-cruise
control-ECU connector C-20 by backprobing.
(1) Do not disconnect auto-cruise control switch connector C-

20.

(2) Turn the ignition switch to "ON" position.
(3) Measure the voltage between terminal 14 and ground by

backprobing.

(4) Turn the ignition switch to "LOCK" (OFF) position.

Q: Is the voltage approximately 0.5 volts or less?

YES : Go to Step 8.
NO : Go to Step 6.

STEP 6. Check auto-cruise control-ECU connector C-20.
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 7.

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

ACX01903

C-20 CONNECTOR
HARNESS SIDE VIEW

AE

AC001451

CONNECTOR: C-20

AB