Mitsubishi 380. Manual - part 346

AUTO-CRUISE CONTROL

ENGINE AND EMISSION CONTROL

17-52

STEP 4. Using Diagnostic Tool MB991958, read the 
auto-cruise control system 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 

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 : Return to Step 1.
NO :  The procedure is complete.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTO-CRUISE CONTROL

ENGINE AND EMISSION CONTROL

17-53

SYMPTOM CHART

M1172002300366

NOTE: If engine speed reaches and exceeds 6000 
r/min the Auto Cruise Control System will be can-
celled automatically.

SYMPTOM

INSPECTION 
PROCEDURE NO.

REFERENCE 
PAGE

Communication with 
Diagnostic Tool is 
not possible

Communication with all systems is 
impossible

-

Group 13A, MPI 
Diagnosis 

− 

Symptom 
Procedures 

− 

Inspection 
Procedure 1 

13A-539

 .

Communication with the Engine ECU only 
is impossible

-

Group 13A, MPI 
Diagnosis 

− 

Symptom 
Procedures 

− 

Inspection 
Procedure 2 

13A-541

 .

Auto-cruise control 
system is not 
cancelled.

When brake pedal is depressed

1

P.17-54

When selector lever is moved to "N" range 2

P.17-54

When "CANCEL" switch is turned ON

3

P.17-55

When clutch pedal is depressed

4

P.17-55

Auto-cruise control system cannot be set.

5

P.17-56

Hunting (repeated acceleration and deceleration) occurs at the 
set vehicle speed.

6

P.17-60

When "CRUISE" (MAIN) switch is turned "ON", "CRUISE" 
indicator lamp inside combination meter does not illuminate. 
(However, auto-cruise control system is normal).

7

P.17-62

AUTO-CRUISE CONTROL

ENGINE AND EMISSION CONTROL

17-54

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: When the Brake Pedal is Depressed, Auto-cruise Control System is not 
Cancelled.

.

COMMENT

The stoplamp switch circuit is suspected.

.

TROUBLESHOOTING HINTS (THE MOST 
LIKELY CAUSES FOR THIS CASE:)

• Malfunction of the stoplamp switch.

• 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

Refer to 

P.17-35

, Diagnostic Trouble Code Procedures 

− DTC 

22: Stoplamp Switch System.

INSPECTION PROCEDURE 2: When the Selector Lever is Moved to "N" Range, Auto-cruise Control 
System is not Cancelled.

.

COMMENT

The transmission inhibitor switch circuit is suspected.

.

TROUBLESHOOTING HINTS (THE MOST 
LIKELY CAUSES FOR THIS CASE:)

• Malfunction of the transmission inhibitor switch.

• Damaged harness or connector.

• Malfunction of the Engine ECU.

• Malfunction of A/T ECU.

Circuit drawings

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

• Refer to component locations GROUP-

70

DIAGNOSIS

Refer to GROUP 23A, A/T Diagnosis 

− Diagnostic Trouble 

Code Procedures 

− DTC 0705: Transmission Inhibitor Switch 

System (Open/short Circuit) 

P.23A-97

.

AUTO-CRUISE CONTROL

ENGINE AND EMISSION CONTROL

17-55

INSPECTION PROCEDURE 3: When the Auto-cruise Control "CANCEL" Switch is Set to ON, 
Auto-cruise Control System is not Cancelled.

.

COMMENT

The cause is probably an open-circuit in the output in 
the circuit inside the "CANCEL" switch.

.

TROUBLESHOOTING HINTS (THE MOST 
LIKELY CAUSES FOR THIS CASE:)

• Malfunction of the auto-cruise control switch.

Circuit drawings

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

• Refer to component locations GROUP-

70

DIAGNOSIS

Replace the auto-cruise control switch. (Refer to 

P.17-75

, 

Auto-cruise Control).

INSPECTION PROCEDURE 4: When the Clutch Pedal is Depressed, Auto-cruise Control System is not 
Cancelled.

.

COMMENT

The clutch switch circuit is suspected.

.

TROUBLESHOOTING HINTS (THE MOST 
LIKELY CAUSES FOR THIS CASE:)

• Malfunction of the clutch switch.

• 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

Refer to 

P.17-15

, Diagnostic Trouble Code Procedures 

− DTC 

0830: Clutch Switch System.