Mitsubishi Galant. Manual — part 367
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-38
Auto-cruise control is not can-
celled.
When brake pedal is depressed
2
When selector lever is moved to "N"
range
3
When "CANCEL" switch is turned
ON
4
Auto-cruise control cannot be set.
5
Hunting (repeated acceleration and deceleration) occurs at the set
vehicle speed.
6
Auto-cruise control indicator light inside combination meter does not
illuminate. (However, auto-cruise control is normal.)
7
SYMPTOMS
INSPECTION
PROCEDURE
NO.
REFERENCE
PAGE
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.)
AC004590
Auto-cruise Control-ECU Supply, Ground and Data Link Circuit
AB
AC004591
CONNECTOR: C-23
AB
AC004592AB
CONNECTOR: C-73
JUNCTION BLOCK
(FRONT VIEW)
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-40
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-52 by backprobing.
(1) Do not disconnect auto-cruise control-ECU connector C-52.
(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.
AC004572AB
CONNECTOR: C-52
AC004593AB
CONNECTOR: C-77
JUNCTION BLOCK
(FRONT VIEW)
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16
ACX01902AD
C-52 CONNECTOR
HARNESS SIDE VIEW
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-41
STEP 2. Check auto-cruise control-ECU connector C-52.
Q: Is the connector damaged?
YES : Repair or replace connector.
Refer to GROUP 00E, Harness Connector Inspection
.
Then check that the malfunction is eliminated.
NO : Go to Step 3.
STEP 3. Check junction block connector C-73 and C-77.
Q: Is any connector damaged?
YES : Repair or replace connector.
Refer to GROUP 00E, Harness Connector Inspection
.
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-52.
Q: Is any harness wire between ignition switch and auto-
cruise control-ECU connector C-52 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
.)
Then check that the malfunction is eliminated.
AC004572AB
CONNECTOR: C-52
AC004592AB
CONNECTOR: C-73
JUNCTION BLOCK
(FRONT VIEW)
AC004593AB
CONNECTOR: C-77
JUNCTION BLOCK
(FRONT VIEW)
AC004572AB
CONNECTOR: C-52
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