Mitsubishi 380. Manual - part 349

AUTO-CRUISE CONTROL

ENGINE AND EMISSION CONTROL

17-64

STEP 2. Using Diagnostic Tool MB991958, read the MPI 
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) 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.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTO-CRUISE CONTROL

ENGINE AND EMISSION CONTROL

17-65

DATA LIST REFERENCE TABLE - Auto Cruise Control

M1172002400471

CAUTION

• When shifting the selector lever to "D" range, apply the brakes so that the vehicle does not move 

forward.

• Driving tests always need two persons: one driver and one observer.

NOTE: *:After the inspection is completed, disconnect the throttle position sensor connector, and then delete 
the diagnostic trouble code using use of Diagnostic Tool MB991958. (Refer to 

P.17-11

).

MUT-III 
Diagnostic 
Tool 
DISPLAY

ITEM 
NO.

INSPECTION ITEM

INSPECTION REQUIREMENT

NORMAL 
CONDITION

APS 
SNS(MAIN)

11

Accelerator pedal 
position sensor (main)

Ignition 
switch: 
"ON"

Accelerator pedal: Released

435 

− 1,035 mV

Accelerator pedal: Gradually 
depressed

Increases in 
response to the 
pedal depression 
stroke

Accelerator pedal: Fully 
depressed

4,000 mV or more

BRAKE SW

89

Stoplamp switch

Brake pedal: Depressed

ON

Brake pedal: Released

OFF

CANCEL 
CODE

57

Cancel code

Ignition switch: "ON"

The cancel code, 
which set when the 
auto-cruise control 
system was 
cancelled at the 
last time, is set 
again.

CANCEL 
SWITCH

75

Auto-cruise 
control 
switch

CANCEL

"CANCEL" switch: ON

ON

"CANCEL" switch: OFF

OFF

CLUTCH SW 78

Transmission inhibitor 
switch

Transmission inhibitor switch: "P" or 
"N"

ON

Transmission inhibitor switch: Other 
than above

OFF

CRUISE

81

Auto-cruise control 
system operation

Auto-cruise control system: active

ON

Auto-cruise control system: Inactive

OFF

MAIN SW

86

Auto-cruise 
control 
switch

CRUISE 
(MAIN)

"CRUISE" (MAIN) switch: "ON"

ON

"CRUISE" (MAIN) switch: "OFF"

OFF

RESUME 
SWITCH

91

Auto-cruise 
control 
switch

ACC/RES "ACC/RES" switch: ON

ON

"ACC/RES" switch: OFF

OFF

SET SWITCH 92

Auto-cruise 
control 
switch

COAST/S
ET

"COAST/SET" switch: ON

ON

"COAST/SET" switch: OFF

OFF

STOPLIGHT 
SW

74

Stoplamp switch

Brake pedal: Depressed

ON

Brake pedal: Released

OFF

AUTO-CRUISE CONTROL

ENGINE AND EMISSION CONTROL

17-66

WARNING

If the air intake duct is removed from the throttle body take great care to keep fingers away 
from the throttle plate. The drive motor has very high torque and is capable of random move-
ment at any time. Do not under any circumstances activate the throttle plate by hand.
When removing the throttle body from the intake manifold disconnect the wiring first. During 
replacement connect the wiring last.
Do not activate the throttle body using a DC suppy to test the motor,as permanent damage to 
the throttle body will result.

TP 
SNSR(MAIN)

13

Throttle position sensor 
(main)*

(1) Accelerator pedal: 
Released
(2) Accelerator pedal: 
Depressed

(1) Throttle 
valve fully 
closed

1035 

− 1250 mV

(2) Throttle 
valve fully 
open

4,000 mV or more

A/C switch: "OFF" to "ON"

Voltage rises

Selector lever: "N" to "D" 

Voltage rises

VSS

04

Vehicle speed signal

Road test the vehicle

The speedometer 
and Diagnostic 
Tool MB991958 
display the same 
value.

MUT-III 
Diagnostic 
Tool 
DISPLAY

ITEM 
NO.

INSPECTION ITEM

INSPECTION REQUIREMENT

NORMAL 
CONDITION

AUTO-CRUISE CONTROL

ENGINE AND EMISSION CONTROL

17-67

ENGINE ECU TERMINAL VOLTAGE REFERENCE CHART FOR AUTO-CRUISE 
CONTROL SYSTEM OPERATION

M1172004800055

1. Disconnect the Engine ECU connectors B-20, 

B-21, and connect special tool MB992044 
(ENGINE ECU check harness) in between.

2. Measure the voltages between the check 

connector terminals of special tool MB992044 and 
ground connector B-21 terminals 4 or 6.

16DB403A

SPECIAL TOOL- ENGINE ECU CHECK HARNESS (MB992044) CONNECTOR:

94-PIN
CONNECTOR
(ENGINE ECU CONNECTOR
B-21)

60-PIN
CONNECTOR
(ENGINE ECU CONNECTOR
B-20)

TERMINAL 
NO.

CHECK ITEM

CHECK CONDITION

NORMAL 
CONDITION

18 (B-21)

Stoplamp switch

Ignition 
switch: 
"ON"

Depress the brake pedal.

Battery positive 
voltage

Release the brake pedal.

1V or less

14 (B-21)

Auto-cruise control 
switch power supply

Ignition 
switch: 
"ON"

All switches: OFF

4.7 

− 5.0 V 

"CRUISE" (MAIN) switch: "ON"

0 

− 0.3 V 

"COAST/SET" switch: ON

2.0 

− 2.8 V 

"ACC/RES" switch: ON

3.3 

− 4.1 V 

"CANCEL" switch: ON

0.8 

− 1.5 V 

76 (B-21)

Accelerator pedal 
position sensor (sub) 
power supply

Ignition switch: "ON"

4.9 

− 5.1 V

59 (B-21)

Accelerator pedal 
position sensor 
(main)

Ignition 
switch: 
"ON"

Release the accelerator pedal

0.435 

− 1.035 V

 

Depress the accelerator pedal.

4.0 V or more

81 (B-21)

Accelerator pedal 
position sensor (sub)

Ignition 
switch: 
"ON"

Release the accelerator pedal

0.435 

− 1.035 V

 

Depress the accelerator pedal.

4.0 V or more

75 (B-21)

Accelerator pedal 
position sensor 
(main) power supply

Ignition switch: "ON"

4.9 

− 5.1 V

21 (B-21)

Brake switch

Ignition 
switch: 
"ON"

Depress the brake pedal.

1V or less

Release the brake pedal.

1V or less

9 (B-20)

Transmission inhibitor 
switch: "P" and "N" 
Crank switch signal

Ignition 
switch: 
"ON"

Transmission inhibitor switch: "P" or 
"N" Crank switch signal

Battery positive 
voltage

Transmission inhibitor switch: Other 
than above

1V or less