Mitsubishi Montero Sport (2004+). Manual - part 254

 

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Mitsubishi Montero Sport (2004+). Manual - part 254

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-429

.

CIRCUIT OPERATION

• The injector power is supplied from the MFI relay 

(terminal No. 1).

• The PCM controls the injector by turning the 

power transistor in the PCM "ON" and "OFF".

.

TECHNICAL DESCRIPTION

• The amount of fuel injected by the injector is con-

trolled by the amount of continuity time the coil is 
grounded by the PCM.

• A surge voltage is generated when the injectors 

are driven and the current flowing to the injector 
coil is shut off.

• The PCM checks this surge voltage.

.

DESCRIPTIONS OF MONITOR METHODS
Off-surge does not occur after injector is operated.

.

MONITOR EXECUTION
Continuous

.

MONITOR EXECUTION CONDITIONS (Other 
monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.

AK200020

CONNECTOR: A-04

AB

A-04(B)

AK103911AB

CONNECTOR: C-14

C-14

AK103738AD

CONNECTOR: C-89

PCM

C-89(GR)

AK200021

AB

A-73(GR)

A-74(GR)

A-75(GR)

A-70(GR)

A-71(GR)

A-72(GR)

CONNECTORS: A-70, A-71, A-72, A-73, A-74, 
                            A-75

AK201000

MFI RELAY

CONNECTOR: C-59

AB

C-59

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-430

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Engine is running.

Judgment Criteria

• Injector coil surge voltage (battery positive volt-

age + 2 volts) has not been detected for two sec-
onds.

.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Procedure 6 

− Other Monitor 

P.13A-4

.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this code to be set are:)

• Injector failed.

• Open or shorted injector circuit, or harness dam-

age or connector damage.

• PCM failed.

START

END

NO

NO

NO

YES

YES

YES

MALFUNCTION

GOOD

MONITORING

CONDITIONS

CONTINUOUS

FAILURE FOR 2secs

INJ. SURGE V < V

B

 + 2.0 V

AK204052

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-431

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I

• MB991827: USB Cable

• MB991911: Main Harness B

• MD998474: Test Harness

STEP 1. Using scan tool MB991958, check actuator test 
items 01, 02, 03, 04, 05, 06: Injectors.

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) Connect scan tool MB991958 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991958 to the actuator testing mode for 

item 01, 02, 03, 04, 05, 06 Injectors.

(4) Warm up the engine to normal operating temperature: 80

°C 

to 96

°C (176°F to 205°F).

• Does the idle state worsen when the injector is cut off. 

(Does idling become unstable or does the engine stall)

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the actuator operating properly?

YES : It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

P.00-7

.

NO :  Go to Step 2.

STEP 2. Check connector A-04 at injector intermediate 
connector for damage.
Q: Is the connector in good condition?

YES : Go to Step 3.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 12.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

AK200014

7

2 1
6 5

4 3
8

CONNECTOR: A-04

AB

FEMALE SIDE 
CONNECTOR

A-04(B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-432

STEP 3. Check the injector resistance at injector 
intermediate connector A-04.
(1) Disconnect the injector intermediate connector A-04.

(2) Measure the resistance between each male connector side 

terminal.

a. Measure the resistance between terminal No. 3 and No. 

8 when measuring No. 1 cylinder.

b. Measure the resistance between terminal No. 2 and No. 

8 when measuring No. 2 cylinder.

c. Measure the resistance between terminal No. 1 and No. 

8 when measuring No. 3 cylinder.

d. Measure the resistance between terminal No. 7 and No. 

8 when measuring No. 4 cylinder.

e. Measure the resistance between terminal No. 6 and No. 

8 when measuring No. 5 cylinder.

f. Measure the resistance between terminal No. 5 and No. 

8 when measuring No. 6 cylinder.

• Resistance should be between 13 and 16 ohms.

Q: Is the measured resistance between 13 and 16 ohms?

YES : Go to Step 6.
NO :  Go to Step 4.

STEP 4. Check the connector at injector for damage.
(1) Remove the intake manifold.

a. Check the connector A-75 when checking No. 1 cylin-

der.

b. Check the connector A-72 when checking No. 2 cylin-

der.

c. Check the connector A-74 when checking No. 3 cylin-

der.

d. Check the connector A-71 when checking No. 4 cylin-

der.

e. Check the connector A-73 when checking No. 5 cylin-

der.

f. Check the connector A-70 when checking No. 6 cylin-

der.

Q: Is the harness connector in good condition?

YES : Go to Step 5.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 12.

AK200014

7

2 1
6 5

4 3
8

CONNECTOR: A-04

AB

FEMALE SIDE 
CONNECTOR

A-04(B)

AK000542

6

3 4
7 8

1 2
5

INJECTOR
INTERMEDIATE
CONNECTOR

AB

AK200022

1

2

AB

CONNECTORS: A-70, A-71, A-72, A-73, A-74, 
                            A-75

A-70(GR)

A-71(GR)

A-72(GR)

HARNESS CONNECTOR: 
COMPONENT SIDE

A-73(GR)

A-74(GR)

A-75(GR)

 

 

 

 

 

 

 

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