Mitsubishi 380. Manual — part 339
AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL
17-24
STEP 4. Check Engine ECU connector B-21 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Are the connector and terminals in good condition?
YES : Go to Step 5.
NO : Repair the faulty connector if possible or as
recommended, replace complete wiring harness.
(Refer to GROUP 00E, Harness Connector Inspection
). Install the air bag module (driver’s side).
(Refer to GROUP 52B, Air Bag Modules and Clock
Spring
STEP 5. Check the harness for short circuit to ground
between the Engine ECU connector B-21 terminal 14 and
the auto-cruise control switch connector C-302 terminal 2.
(1) Disconnect Engine ECU connector B-21 and measure at
the harness connector side.
(2) Turn the ignition switch to the "LOCK" (OFF) position.
(3) Measure the continuity between Engine ECU connector
B-21 terminal 14 and ground.
(4) Reconnect Engine ECU connector B-21.
Q: Is the measured continuity open circuit?
YES : Install the air bag module (driver’s side). (Refer to
GROUP 52B, Air Bag Modules and Clock Spring
). Then go to Step 17.
NO : Go to Step 6.
10DB133A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
10DB133A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL
17-25
STEP 6. Check intermediate connector C-29, auto-cruise
control switch connector C-302 and clock spring
connectors C-303 and C-306 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
Q: Are the connectors and terminals in good condition?
YES : Go to Step 7.
NO : Repair the faulty connector if possible or as
recommended, replace complete wiring harness.
(Refer to GROUP 00E, Harness Connector Inspection
). Install the air bag module (driver’s side).
(Refer to GROUP 52B, Air Bag Modules and Clock
Spring
17DB041A
C-29
CONNECTOR: C-29
C-29 MALE SIDE CONNECTOR
17DB040A
C-306 HARNESS
CONNECTOR:
COMPONENT SIDE
C-303 HARNESS
CONNECTOR:
COMPONENT SIDE
C-302 HARNESS
CONNECTOR:
COMPONENT SIDE
C-302 (Y)
C-303 (GR)
C-306
CONNECTORS: C-302, C-303, C-306
CLOCK
SPRING
AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL
17-26
STEP 7. Check the harness wire between Engine ECU
connector B-21 terminal 14 and auto-cruise control switch
connector C-302 terminal 2 for damage.
Q: Are the harness wires in good condition?
YES : Go to Step 8.
NO : Repair the damaged harness wire if possible or as
recommended replace complete wiring harness and
install the air bag module (driver’s side). (Refer to
GROUP 52B, Air Bag Modules and Clock Spring
). Then go to Step 18.
STEP 8. Check the clock spring.
Refer to GROUP 52B, Air Bag Modules and Clock Spring
.
Q: Is the clock spring in good condition?
YES : It can be assumed that this malfunction is intermittent.
(Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunction
). Install
the air bag module (driver’s side). (Refer to GROUP
52B, Air Bag Modules and Clock Spring
Then go to Step 18.
NO : Replace the clock spring and install the air bag
module (driver’s side). (Refer to GROUP 52B, Air Bag
Modules and Clock Spring
). Then go to
Step 18.
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
17DB042A
C-302 (Y)
CONNECTOR: C-302
C-302 HARNESS
CONNECTOR:
COMPONENT SIDE
CLOCK
SPRING
AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL
17-27
STEP 9. Measure the ground voltage at auto-cruise control
switch connector C-302 by backprobing.
(1) Do not disconnect auto-cruise control switch connector
C-302.
(2) Turn the ignition switch to the "ON" position.
(3) Turn the "CRUISE" (MAIN) switch to the "ON" position.
(4) Measure the ground voltage between auto-cruise control
switch connector C-302 terminal 3 and ground by
backprobing.
(5) Turn the "CRUISE" (MAIN) switch to the "OFF" position.
(6) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage 0.5 volt or less?
YES : Go to Step 15.
NO : Go to Step 10.
STEP 10. Measure the ground voltage at Engine ECU
connector B-21.
(1) Disconnect all the connectors from the Engine ECU.
(2) Connect special tool MB992044 between the Engine ECU
and the body-side harness connector.
(3) Turn the ignition switch to the "ON" position.
(4) Turn the "CRUISE" (MAIN) switch to the "ON" position.
(5) Measure the ground voltage between special tool 94-pin
connector terminal 15 (Engine ECU connector B-21
terminal 15) and ground.
(6) Turn the "CRUISE" (MAIN) switch to the "OFF" position.
(7) Turn the ignition switch to the "LOCK" (OFF) position.
(8) Disconnect special tool MB992044 between the Engine
ECU and the body-side harness connector.
(9) Reconnect all the connectors to the Engine ECU.
Q: Is the measured voltage 0.5 volt or less?
YES : Go to Step 12.
NO : Go to Step 11.
17DB042A
C-302 (Y)
CONNECTOR: C-302
C-302 HARNESS
CONNECTOR:
COMPONENT SIDE
CLOCK
SPRING
1 2
AC209264
3
AB
C-302 HARNESS
CONNECTOR:
HARNESS SIDE
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
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