2005 MITSUBISHI 380 service

AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL17-31
STEP 14. 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.
STEP 15. Check auto-cruise control switch connector
C-302 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 16.
NO : Repair the faulty connector if possible, or as
recommended, replace complete wiring harness or
module. (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 CONTROL17-32
STEP 16. Check the auto-cruise control switch.
(1) Remove auto-cruise control switch. (Refer to P.17-75).
(2) Measure the resistance between terminal 2 and terminal 3
when each of the "CRUISE" (MAIN), "COAST/SET",
"ACC/RES" and "CANCEL" switch is pressed.
Q: Is the resistance within specifications?
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 : Replace the auto-cruise control switch. (Refer to
P.17-75). 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 17. Using Diagnostic Tool MB991958, read the
diagnostic trouble code.
To prevent damage to Diagnostic Tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting Diagnostic Tool
MB991958.
(1) Connect Diagnostic Tool MB991958 to the data link
connector. (Refer to P.17-11).
(2) Turn the ignition switch to the "ON" position.
(3) Set Diagnostic Tool MB991958 to read the diagnostic
trouble codes. (Refer to P.17-11).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect Diagnostic Tool MB991958.
Q: Is DTC 1564 set?
YES : Replace the Engine ECU.[Refer to GROUP 13A,
Engine ECU 13A-675] . Then go to Step 18.
NO : 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). SWITCH POSITION SPECIFIED CONDITION
"CRUISE" (MAIN) switch
"OFF"Open circuit
"CRUISE" (MAIN) switch
"ON"Less than 2 ohms
"CANCEL" switch ON Approximately 100
"ACC/RES" switch ON Approximately 887
"COAST/SET" switch ON Approximately 300

AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL17-48
STEP 20. Using Diagnostic Tool MB991958, check data list
item 89: Normally closed Brake Switch.
To prevent damage to Diagnostic Tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting Diagnostic Tool
MB991958.
(1) Connect Diagnostic Tool MB991958 to the data link
connector. (Refer to P.17-11).
(2) Turn the ignition switch to the "ON" position.
(3) Set Diagnostic Tool MB991958 to data reading mode for
auto-cruise control system. (Refer to P.17-11).
Item 89, Normally closed Brake Switch.
When the brake pedal is depressed, the display on
Diagnostic Tool MB991958 should be "ON".
When the brake pedal is released, the display on
Diagnostic Tool MB991958 should be "OFF".
(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect Diagnostic Tool MB991958.
Q: Is the switch operating properly?
YES : Go to Step 21.
NO : Replace the Engine ECU. [Refer to GROUP 13A,
Engine ECU 13A-675] . Then go to Step 22.
STEP 21. Using Diagnostic Tool MB991958, read the
diagnostic trouble codes.
To prevent damage to Diagnostic Tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting Diagnostic Tool
MB991958.
(1) Connect Diagnostic Tool MB991958 to the data link
connector. (Refer to P.17-11).
(2) Turn the ignition switch to the "ON" position.
(3) Set Diagnostic Tool MB991958 to read the diagnostic
trouble codes. (Refer to P.17-11).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect Diagnostic Tool MB991958.
Q: Is DTC 1571 set?
YES : Replace the Engine ECU.[Refer to GROUP 13A,
Engine ECU 13A-675] . Then go to Step 22.
NO : 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).

AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL17-51
STEP 2. Using Diagnostic Tool MB991958, read the A/T
system diagnostic trouble code.
To prevent damage to Diagnostic Tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting Diagnostic Tool
MB991958.
(1) Connect Diagnostic Tool MB991958 to the data link
connector. (Refer to P.17-11).
(2) Turn the ignition switch to the "ON" position.
(3) Check for A/T system diagnostic trouble code. (Refer to
GROUP 23A, A/T Diagnosis
Diagnostic Function How
to Read and Erase Diagnostic Trouble Code P.23A-13).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect Diagnostic Tool MB991958.
Q: Is any DTC set?
YES : Diagnose the A/T system. (Refer to GROUP 23A, A/T
Diagnosis
Diagnostic Trouble Code Chart
P.23A-34). Then go to Step 4.
NO : Go to Step 3.
STEP 3. Using Diagnostic Tool MB991958, read the
auto-cruise control system diagnostic trouble code.
To prevent damage to Diagnostic Tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting Diagnostic Tool
MB991958.
(1) Connect Diagnostic Tool MB991958 to the data link
connector. (Refer to P.17-11).
(2) Turn the ignition switch to the "ON" position.
(3) Use Diagnostic Tool MB991958 to read the auto-cruise
control system diagnostic trouble codes. (Refer to P.17-11).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect Diagnostic Tool MB991958.
Q: Is DTC 1574 set?
YES : Replace the Engine ECU.[Refer to GROUP 13A,
Engine ECU 13A-675] . Then go to Step 4.
NO : 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).

AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL17-59
STEP 4. Using Diagnostic Tool MB991958, check A/T data
list item 34: Transmission Inhibitor Switch.
To prevent damage to Diagnostic Tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting Diagnostic Tool
MB991958.
(1) Connect Diagnostic Tool MB991958 to the data link
connector. (Refer to P.17-11).
(2) Turn the ignition switch to the "ON" position.
(3) Set Diagnostic Tool MB991958 to data reading mode for
Auto Transmission system. (Refer to P.17-11).
Item 34, Transmission Inhibitor Switch.
When selector lever is at the "P" or "N" position, the
display on Diagnostic Tool MB991958 should be
"ON".
When selector lever is at the "R" or "D" position, the
display on Diagnostic Tool MB991958 should be
"OFF".
(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect Diagnostic Tool MB991958.
Q: Is the switch operating properly?
YES : Go to Step 5.
NO : Refer to P.17-54, Symptom Procedures
Inspection
Procedure 2. Then go to Step 6.
STEP 5. Check the symptoms.
Q: Can auto-cruise control be set?
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).
NO : Replace the Engine ECU.[Refer to GROUP 13A,
Engine ECU 13A-675] . Then go to Step 6.
STEP 6. Check the symptoms.
Q: Can auto-cruise control be set?
YES : The procedure is complete.
NO : Return to Step 1.

AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL17-61
STEP 2. Using Diagnostic Tool MB991958, read the
diagnostic trouble code.
To prevent damage to Diagnostic Tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting Diagnostic Tool
MB991958.
(1) Connect Diagnostic Tool MB991958 to the data link
connector. (Refer to P.17-11).
(2) Turn the ignition switch to the "ON" position.
(3) Check for MPI system diagnostic trouble code(Refer to
GROUP 13A, MPI Diagnosis
Diagnostic Function How
to Read and Erase Diagnostic Trouble Code 13A-6).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect Diagnostic Tool MB991958.
Q: Is any DTC set?
YES : Diagnose the MPI system. (Refer to GROUP 13A,
MPI Diagnosis
Diagnostic Trouble Code Chart
13A-17). Then go to Step 4.
NO : Go to Step 3.
STEP 3. Retest the system
Q: Does hunting occur?
YES : Replace the Engine ECU[Refer to GROUP 13A,
Engine ECU 13A-675]. Then go to Step 4.
NO : 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).
STEP 4. Retest the system
Q: Does hunting occur?
YES : Return to Step 1.
NO : The procedure is complete.

AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL17-64
STEP 2. Using Diagnostic Tool MB991958, read the MPI
diagnostic trouble code.
To prevent damage to Diagnostic Tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting Diagnostic Tool
MB991958.
(1) Connect Diagnostic Tool MB991958 to the data link
connector. (Refer to P.17-11).
(2) Turn the ignition switch to the "ON" position.
(3) Check for MPI system diagnostic trouble code(Refer to
GROUP 13A, MPI Diagnosis
Diagnostic Function How
to Read and Erase Diagnostic Trouble Code 13A-6).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect Diagnostic Tool MB991958.
Q: Is DTC U1108 set?
YES : . Then go to Step 4.
NO : Go to Step 3.
STEP 3. Retest the system.
Q: Does the "CRUISE" indicator lamp illuminate when the
"CRUISE" (MAIN) switch is turned "ON"?
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).
NO : Replace the Engine ECU. [Refer to GROUP 13A,
Engine ECU 13A-675]. Then go to Step 4.
STEP 4. Retest the system.
Q: Does the "CRUISE" indicator lamp illuminate when the
"CRUISE" (MAIN) switch is turned "ON"?
YES : The procedure is complete.
NO : Return to Step 1.

AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL17-70
MB991223
A: MB991219
B: MB991220
C: MB991221
D: MB991222
Harness set
A: Inspection harness
B: LED harness
C: LED harness adapter
D: ProbeGeneral service tools Checking the continuity
and measuring the
voltage at the harness
connector
MB992044
Engine ECU check
harness
Measuring the terminal
voltage at the Engine
ECU
MB992045
Auto Trans. ECU check
harness
Measuring the terminal
voltage at the Auto Trans.
ECU TOOL TOOL NUMBER AND
NAMESUPERSESSION APPLICATION