Mitsubishi Eclipse. Manual — part 692

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-49

Auto-cruise control is
not cancelled.

When brake pedal is depressed.

2

P.17-56

When clutch pedal is depressed. <M/T> 3

P.17-62

When selector lever is moved to "N"
range. <A/T>

4

P.17-67

When "CANCEL" switch is turned ON.

5

P.17-71

Auto-cruise control cannot be set.

6

P.17-71

Hunting (repeated acceleration and deceleration) occurs at the
set vehicle speed. <M/T>

7

P.17-73

Hunting (repeated acceleration and deceleration) occurs at the
set vehicle speed. <A/T>

8

P.17-75

Auto-cruise control indicator light inside combination meter does
not illuminate. (However, auto-cruise control is normal.)

9

P.17-78

SYMPTOM

INSPECTION
PROCEDURE NO.

REFERENCE PAGE

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-50

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: Communication with Scan Tool MB991958 is not Possible
(Communication with the Auto-cruise Control-ECU Only is not Possible.)

AC106774

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

AB

AC001451

CONNECTOR: C-20

AB

AC101201AC

CONNECTOR: C-29

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-51

.

CIRCUIT OPERATION
Power of the auto-cruise control-ECU is transmitted
from the ignition switch (IG1) to the auto-cruise con-
trol-ECU through multi-purpose fuse 4 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 (terminal number 6) 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 6 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 2.

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

AC103152 AB

C-20 CONNECTOR
HARNESS SIDE VIEW

AUTO-CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-52

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-108 and C-111.
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 (terminal
number 6).
Q: Is any harness wire between ignition switch and

auto-cruise control-ECU connector C-20 (terminal
number 6) 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.

AC001451

CONNECTOR: C-20

AB

AC103108AB

CONNECTORS: C-108, C-111

C-108

C-111

JUNCTION BLOCK
(FRONT VIEW)

AC001451

CONNECTOR: C-20

AB