2005 MITSUBISHI 380 clock

AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL17-21
CIRCUIT OPERATION
This circuit judges the signals of each switch
("COAST/SET", "ACC/RES" and "CANCEL") of the
auto-cruise control switch. The Engine ECU detects
the state of the auto-cruise control switch by sensing
the voltages shown below.
When all switches are OFF: 4.7 5.0 volts
When the "CRUISE" (MAIN) switch is "ON": 0
0.3 volt
When the "COAST/SET" switch is ON: 2.0 2.8
volts
When the "ACC/RES" switch is ON: 3.3 4.1
volts
When the "CANCEL" switch is ON: 0.8 1.5 volts
.
DTC SET CONDITIONS
Check Condition
The "CRUISE" indicator lamp illuminates.Judgement Criteria
If the auto-cruise control switch is operated, this
DTC will be set when the Engine ECU terminal
voltage is different from the standard value.
.
TROUBLESHOOTING HINTS (THE MOST
LIKELY CAUSES FOR THIS CASE:)
Malfunction of the auto-cruise control switch.
Malfunction of the clock spring.
Damaged harness or connector.
Malfunction of the Engine ECU.
Circuit drawings
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
Refer to component locations GROUP-70
DIAGNOSIS
Required Special Tools:
MB991958: Diagnostic Tool (MUT-III Sub Assembly)
MB991824: V.C.I.
MB991827: MUT-III USB Cable
MB991910: MUT-III Main Harness A
MB991223: Harness Set
MB992044: ENGINE-ECU Check Harness

AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL17-23
STEP 2. Measure the power supply voltage at auto-cruise
control switch connector C-302 by backprobing.
(1) Remove the air bag module (driver’s side). (Refer to
GROUP 52B, Air Bag Modules and Clock Spring
P.52B-237).
(2) Connect the negative (
) battery cable.
(3) Do not disconnect auto-cruise control switch connector
C-302.
(4) Turn the ignition switch to the "ON" position.
(5) The "CRUISE" (MAIN) switch to the "OFF" position.
(6) Measure the power supply voltage between auto-cruise
control switch connector C-302 terminal 2 and ground by
backprobing.
(7) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.7 and 5.0 volts?
YES : Go to Step 9.
NO : Go to Step 3.
STEP 3. Measure the power supply 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) The "CRUISE" (MAIN) switch to the "OFF" position.
(5) Measure the power supply voltage between special tool
94-pin connector terminal 14 (Engine ECU connector B-21
terminal 14) and ground.
(6) Turn the ignition switch to the "LOCK" (OFF) position.
(7) Disconnect special tool MB992044 between the Engine
ECU and the body-side harness connector.
(8) Reconnect all the connectors to the Engine ECU.
Q: Is the measured voltage between 4.7 and 5.0 volts?
YES : Go to Step 6.
NO : Go to Step 4.

AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL17-24
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
P.00E-2). Install the air bag module (driver’s side).
(Refer to GROUP 52B, Air Bag Modules and Clock
Spring P.52B-237). Then go to Step 18.
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
P.52B-237). Then go to Step 17.
NO : Go to Step 6.

AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL17-25
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
P.00E-2). Install the air bag module (driver’s side).
(Refer to GROUP 52B, Air Bag Modules and Clock
Spring P.52B-237). Then go to Step 18.

AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL17-26
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
P.52B-237). Then go to Step 18.
STEP 8. Check the clock spring.
Refer to GROUP 52B, Air Bag Modules and Clock Spring
P.52B-244.
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 P.00-14). Install
the air bag module (driver’s side). (Refer to GROUP
52B, Air Bag Modules and Clock Spring P.52B-237).
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 P.52B-237). Then go to
Step 18.

AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL17-28
STEP 11. 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 : Install the air bag module (driver’s side). (Refer to
GROUP 52B, Air Bag Modules and Clock Spring
P.52B-237). Then go to Step 17.
NO : Repair the faulty connector if possible, or as
recommended, replace complete wiring harness.
(Refer to GROUP 00E, Harness Connector Inspection
P.00E-2). Install the air bag module (driver’s side).
(Refer to GROUP 52B, Air Bag Modules and Clock
Spring P.52B-237). Then go to Step 18.

AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL17-29
STEP 12. Check Engine ECU connector B-21, 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.

AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL17-30
Q: Are the connectors and terminals in good condition?
YES : Go to Step 13.
NO : Repair the faulty connector if possible, or as
recommended, replace complete wiring harness.
(Refer to GROUP 00E, Harness Connector Inspection
P.00E-2). Install the air bag module (driver’s side).
(Refer to GROUP 52B, Air Bag Modules and Clock
Spring P.52B-237). Then go to Step 18.
STEP 13. Check the harness wire between Engine ECU
connector B-21 terminal 15 and auto-cruise control switch
connector C-302 terminal 3 for damage.
Q: Are the harness wires in good condition?
YES : Go to Step 14.
NO : Repair the damaged harness wire if possible, or
replace complete wiring harness and install the air
bag module (driver’s side). (Refer to GROUP 52B, Air
Bag Modules and Clock Spring P.52B-237). Then go
to Step 18.