Mitsubishi Montero (2002-2004). Manual - part 645

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-277

STEP 8. Check the right bank injector resistance at
intermediate connector B-44.
(1) Disconnect the injector intermediate connector B-44.

(2) Measure the resistance between each injector side

connector terminal.

a. Measure the resistance between terminal No. 8 and No.

3 when measuring No. 1 cylinder injector.

b. Measure the resistance between terminal No. 8 and No.

1 when measuring No .3 cylinder injector.

c. Measure the resistance between terminal No. 8 and No.

6 when measuring No. 5 cylinder injector.

• Resistance should be between 13 and 16 ohms

[at 20

°C (68°F)].

Q: Is the measured resistance between 13 and 16 ohms [at

°C (68°F)]?

YES : Go to Step 11.
NO : Go to Step 9.

STEP 9. Check harness connector B-01, B-02, B-03 at right
bank injector for damage.
(1) Check the injector connector, which deviates from the

standard value at Step 8.

Q: Is the harness connector in good condition?

YES : Go to Step 10.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 16.

AK200949

B-44(B)

CONNECTOR: B-44

HARNESS
CONNECTOR:
COMPONENT SIDE

AK000452

3 4
7 8

1 2
5

INJECTOR
INTERMEDIATE
CONNECTOR

AK200950

B-03(GR)

B-02(GR)

B-01(GR)

CONNECTORS: B-01, B-02, B-03

HARNESS
CONNECTOR:
COMPONENT SIDE

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-278

STEP 10. Check the right bank injector.
(1) Remove the intake manifold.
(2) Disconnect the right bank injector connector, which

deviates from the standard value at Step 8.

(3) Measure the resistance between injector side connector

terminal No. 1 and No. 2.

Standard value: 13

− 16 ohms [at 20°C (68°F)]

Q: Is the resistance between 13 and 16 ohms [at 20

°C

(68

°F)]?

YES : Repair harness wire between injector intermediate

connector and right bank injector connector because
of harness damage. Then go to Step 16.

NO : Replace the injector. Then go to Step 16.

STEP 11. Check harness connector D-132 at PCM for
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 12.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 16.

AK200950

B-03(GR)

B-02(GR)

B-01(GR)

CONNECTORS: B-01, B-02, B-03

HARNESS
CONNECTOR:
COMPONENT SIDE

AKX01414AB

INJECTOR SIDE
CONNECTOR

1 2

AK200938

CONNECTOR: D-132

HARNESS CONNECTOR:
COMPONENT SIDE

PCM

D-132(GR)

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-279

STEP 12. Check for harness damage between right bank
injector connector and PCM connector.

a. Check the harness wire between injector connector B-01

(terminal No. 2) and PCM connector D-132 (terminal No. 1)
when checking No. 1 cylinder injector.

b. Check the harness wire between injector connector B-02

(terminal No. 2) and PCM connector D-132 (terminal No.
24) when checking No. 3 cylinder injector.

c. Check the harness wire between injector connector B-03

(terminal No. 2) and PCM connector D-132 (terminal No.
10) when checking No. 5 cylinder injector.

Q: Is the harness wire in good condition?

YES : Go to Step 13.
NO : Repair it. Then go to Step 16.

STEP 13. Check the fuel pressure.
Refer to GROUP 13A, On-vehicle Service

− Fuel Pressure Test

P.13Aa-13

Q: Are there any abnormalities?

YES : Go to Step 14.
NO : Repair or replace it. Then go to Step 16.

STEP 14. Check for entry of foreign matter (water,
kerosene, etc.) into fuel.
Q: Are there any abnormalities?

YES : Go to Step 15.
NO : Replace the fuel. Then go to Step 16.

AK200950

B-03(GR)

B-02(GR)

B-01(GR)

CONNECTORS: B-01, B-02, B-03

HARNESS
CONNECTOR:
COMPONENT SIDE

AK200938

CONNECTOR: D-132

HARNESS CONNECTOR:
COMPONENT SIDE

PCM

D-132(GR)

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-280

STEP 15. Replace the right bank injector.
(1) Replace the right bank injector.
(2) Carry out a test drive with the drive cycle pattern. Refer to

GROUP 13A, Procedure 2

− Fuel Trim Monitor

P.13Ab-2

(3) Read in the diagnostic trouble code (DTC).
Q: Is DTC P0171 set?

YES : Replace the PCM. Then go to Step 16.
NO : The inspection is complete.

STEP 16. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to

GROUP 13A, Procedure 2

− Fuel Trim Monitor

P.13Ab-2

(2) Check the diagnostic trouble code (DTC).
Q: Is the DTC P0171 is output?

YES : Retry the troubleshooting.
NO : The inspection is complete.

DTC P0172: System too Rich (bank 1)

Fuel Trim Circuit

• Refer to DTC P0201 − P0206, Injector Circuit.

P.13Ac-318

CIRCUIT OPERATION

• Refer to DTC P0201 − P0206, Injector Circuit.

P.13Ac-318

TECHNICAL DESCRIPTION

• If a malfunction occurs in the fuel system, the fuel

trim value becomes too small.

• The PCM checks whether the fuel trim value is

within a specified range.

DTC SET CONDITIONS

Check Conditions

• Under the closed loop air/fuel ratio control.

• Engine coolant temperature is higher than 77°C

(171

°F).

• Volume airflow sensor output frequency is 100 Hz

or more.

Judgment Criteria

• Long-term fuel trim has continued to be lower

than

−12.5 percent for 5 seconds.

• Short-term fuel trim has continued to be lower

than

−7.4 percent for 5 seconds.

Check Conditions

• Under the closed loop air/fuel ratio control.

• Engine coolant temperature is higher than 77°C

(171

°F).

• Volume airflow sensor output frequency is 100 Hz

or less.

Judgment Criteria

• Long-term fuel trim has continued to be lower

than

−12.5 percent for 5 seconds.

• Short-term fuel trim has continued to be lower

than

−12.5 percent for 5 seconds.

Check Conditions

• Engine coolant temperature is higher than 77°C

(171

°F).

• Under the closed loop air/fuel ratio control.

Judgment Criteria

• Long-term fuel trim has continued to be −12.5

percent for 5 seconds.

• Short-term fuel trim has continued to be −30.0

percent for 5 seconds.

AK200950

B-03(GR)

B-02(GR)

B-01(GR)

CONNECTORS: B-01, B-02, B-03

HARNESS
CONNECTOR:
COMPONENT SIDE

Content .. 643 644 645 646 ..