Mitsubishi 380. Manual - part 345

AUTO-CRUISE CONTROL

ENGINE AND EMISSION CONTROL

17-48

STEP 20. Using Diagnostic Tool MB991958, check data list 
item 89: Normally closed Brake Switch.

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) 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.

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) 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

).

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTO-CRUISE CONTROL

ENGINE AND EMISSION CONTROL

17-49

STEP 22. Using Diagnostic Tool MB991958, read the 
diagnostic trouble codes.

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

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTO-CRUISE CONTROL

ENGINE AND EMISSION CONTROL

17-50

DTC 1574:  Engine ECU and Its Related Components

.

DTC SET CONDITIONS

This DTC is set when there is a failure in the Engine 
ECU and its related components.

.

TROUBLESHOOTING HINTS (THE MOST 
LIKELY CAUSES FOR THIS CODE TO BE 
SET ARE:)

• Malfunction of the MPI system.

• Malfunction of the A/T system.

• 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

STEP 1. Using Diagnostic Tool MB991958, read the MPI 
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) 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 2.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTO-CRUISE CONTROL

ENGINE AND EMISSION CONTROL

17-51

STEP 2. Using Diagnostic Tool MB991958, read the A/T 
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) 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.

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 : 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

).

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827