Mitsubishi Montero (2004+). Manual — part 399

ENGINE CONTROL

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ENGINE AND EMISSION CONTROL

17-3

ENGINE CONTROL

GENERAL DESCRIPTION

M1171000100307

The accelerator cable has been discontinued,
because the electronic-controlled throttle actuator
control system has been adopted.

SPECIAL TOOL

M1171000600056

TOOL

TOOL NUMBER AND
NAME

SUPERSESSION

APPLICATION

MB991958

A: MB991824
B: MB991827
C: MB991910
D: MB991911
E: MB991914
F: MB991825
G: MB991826

MUT-III sub assembly

A: Vehicle

communication
interface (V.C.I.)

B: MUT-III USB cable
C: MUT-III main harness

A (Vehicles with CAN
communication
system)

D: MUT-III main harness

B (Vehicles without
CAN communication
system)

E: MUT-III main harness

C (for Daimler Chrysler
models only)

F: MUT-III measurement

adapter

G: MUT-III trigger

harness

MB991824-KIT
NOTE: G: MB991826
MUT-III trigger harness is
not necessary when
pushing V.C.I. ENTER
key.

Checking diagnostic
trouble codes

CAUTION

MUT-III Main Harness B
(MB991911) should be
used. MUT-III main
harness A and C should
not be used for this
vehicle.

MB991910

MB991826

MB991958

MB991911

MB991914

MB991824

MB991827

MB991825

DO NOT USE

A

B

C

D

E

F

G

DO NOT USE

ENGINE CONTROL

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ENGINE AND EMISSION CONTROL

17-4

ENGINE CONTROL SYSTEM DIAGNOSIS

INTRODUCTION TO ENGINE CONTROL SYSTEM DIAGNOSIS

M1171002000265

If there is a malfunction in the engine control system,
the accelerator pedal or throttle body may be faulty.

ENGINE CONTROL SYSTEM DIAGNOSTIC TROUBLESHOOTING STRATEGY

M1171002100295

Use these steps to plan your diagnostic strategy.
If you follow them carefully, you will be sure that you
have exhausted most of the possible ways to find an
engine control system fault.
1. Gather information from the customer.

2. Verify that the condition described by the

customer exists.

3. Find the malfunction by following the Symptom

Chart.

4. Verify that the malfunction is eliminated.

SYMPTOM CHART

M1171002200311

MB991223

A: MB991219
B: MB991220
C: MB991221
D: MB991222

Harness set

A: Inspection harness
B: LED harness
C: LED harness adapter
D: Probe

General service tools

Checking the continuity
and measuring the
voltage at the harness
connector

MB991348
Test harness set

MB991348-01

Checking throttle position
sensor

TOOL

TOOL NUMBER AND
NAME

SUPERSESSION

APPLICATION

MB991223

A

D

C

B

AD

MB991348

SYMPTOM

INSPECTION PROCEDURE

REFERENCE PAGE

Throttle valve will not fully open or close

1

P.17-5

Accelerator pedal operation not smooth
(over acceleration)

2

P.17-6

ENGINE CONTROL

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ENGINE AND EMISSION CONTROL

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SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: Throttle Valve Will Not Fully Open or Close

DIAGNOSIS

Required Special Tool:

• MB991958: Scan Tool (MUT-III sub assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

STEP 1. Check the accelerator pedal arm return spring.
Q: Is the accelerator pedal arm return spring damaged or

deformed?
YES : Go to Step 2.
NO : Replace, then go to Step 4.

STEP 2. Clean the throttle body (Refer to GROUP 13A,

On-vehicle Service

− Throttle Body Cleaning

P.13A-993

).

Q: Does the throttle valve fully open and close?

YES : The procedure is complete.
NO : Go to Step 3.

ENGINE CONTROL

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ENGINE AND EMISSION CONTROL

17-6

STEP 3. Using scan tool MB991958, read the diagnostic
trouble code.

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Ensure that the ignition switch is at the "LOCK" (OFF)

position.

(2) Start up the personal computer.
(3) Connect special tool MB991827 to special tool MB991824

and the personal computer.

(4) Connect special tool MB991910 to special tool MB991824.
(5) Connect special tool MB991910 to the data link connector.
(6) Turn the power switch of special tool MB991824 to the "ON"

position.
NOTE: When special tool MB991824 is energized, special
tool MB991824 indicator light will be illuminated in a green
color.

(7) Start the MUT-III system on the personal computer.
(8) Turn the ignition switch to the "ON" position.
(9) Check for MFI system diagnostic trouble code (Refer to

GROUP 13A, MFI Diagnosis - How to Read and Erase
Diagnostic Trouble Code

P.13A-4

).

(10)Turn the ignition switch to the "LOCK" (OFF) position, and

then remove scan tool MB991958 in the reverse order of
installation.

Q: Is any DTC set?

YES : Refer to GROUP 13A, Diagnosis

− Diagnostic

Trouble Code Chart

P.13A-26

.

NO : Go to Step 4.

STEP 4. Retest the system.
Q: Does the throttle valve fully open and close?

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

INSPECTION PROCEDURE 2: Accelerator Pedal Operation Not Smooth (Over Acceleration)

DIAGNOSIS

Required Special Tool:

• MB991958: Scan Tool (MUT-III sub assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

STEP 1. Check the accelerator pedal.
Q: Is the accelerator pedal loose?

YES : Tighten, then go to Step 4.
NO : Go to Step 2.

AC306409AF

MB991911

MB991824

MB991827