Mitsubishi 380. Manual — part 348
AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL
17-60
INSPECTION PROCEDURE 6: Hunting (Repeated Acceleration and Deceleration) Occurs at the Set
Vehicle Speed.
.
COMMENT
The output shaft speed sensor signal or the throttle
body is suspected.
.
TROUBLESHOOTING HINTS (THE MOST
LIKELY CAUSES FOR THIS CASE:)
• Malfunction of the output shaft speed sensor.
• Malfunction of the throttle body.
• Malfunction of the Engine ECU.
• Malfunction of the A/T ECU.
Circuit drawings
• Refer to circuit diagrams GROUP-
• Refer to configuration diagrams GROUP-
• Refer to component locations GROUP-
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
STEP 1. Using Diagnostic Tool MB991958, read the
diagnostic trouble code.
CAUTION
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
(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
(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
). Then go to Step 4.
NO : Go to Step 2.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL
17-61
STEP 2. Using Diagnostic Tool MB991958, read the
diagnostic trouble code.
CAUTION
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
(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
).
(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
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
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
STEP 4. Retest the system
Q: Does hunting occur?
YES : Return to Step 1.
NO : The procedure is complete.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL
17-62
INSPECTION PROCEDURE 7: When "CRUISE" (MAIN) Switch is Turned "ON", "CRUISE" Indicator
Light Inside Combination Meter does not Illuminate. (However, Auto-cruise Control System is
Normal).
.
16DB402A
A-02 (GR)
CONNECTOR: A-02
A-02 HARNESS CONNECTOR:
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
17DB046A
C-29
C-101
C-02
C-02 HARNESS
CONNECTOR:
COMPONENT SIDE
C-29 MALE SIDE
CONNECTOR
C-101 HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTORS: C-02, C-29, C-101
17DB047A
C-215 HARNESS CONNECTOR:
COMPONENT SIDE
CONNECTORS: C-211, C-215
C-211 HARNESS CONNECTOR:
COMPONENT SIDE
AUTO-CRUISE CONTROL
ENGINE AND EMISSION CONTROL
17-63
CIRCUIT OPERATION
The Engine ECU detects "CRUISE" (MAIN) switch
"ON" signal to illuminate the "CRUISE" indicator
lamp on the combination meter.
.
COMMENT
Connector(s), wiring harness in the CAN bus line
between the Engine ECU and the combination
meter, power supply to the Engine ECU, the combi-
nation meter, the Engine ECU may be defective.
.
TROUBLESHOOTING HINTS
• Malfunction of the combination meter.
• Damaged harness or connector.
• Malfunction of the Engine ECU.
Circuit drawings
• Refer to circuit diagrams GROUP-
• Refer to configuration diagrams GROUP-
• Refer to component locations GROUP-
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
STEP 1. Using Diagnostic Tool MB991958, diagnose the
CAN bus line.
CAUTION
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
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line. (Refer to
).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect Diagnostic Tool MB991958.
Q: Is the check result satisfactory?
YES : Go to Step 2
NO : Repair the CAN bus lines. (Refer to GROUP 54C,
Diagnosis
− Can Bus Diagnostic Chart
Then go to Step 4.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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