Mitsubishi Montero (2002-2004). Manual — part 564

TROUBLE CODE DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

13Ab-13

PROCEDURE 1

EVAPORATIVE EMISSION SYSTEM LEAK MONITOR
DTC

P0441, P0442, P0451, P0452, P0453, P0455, P0456

Drive cycle
pattern

This monitor [from start to ignition switch "LOCK" (OFF) position] will be completed while traveling with
the following drive cycle pattern. It will take 8 minutes. You must complete this drive twice.
NOTE: Vehicle speed and throttle opening angle should be within the shaded range.

Inspection
conditions

• Engine coolant temperature: 45°C (113°F) or less (The engine is stopped before the test drive is

started)

• Atmospheric temperature: 5 − 45°C (41 − 113°F)

• Condition of A/T: Selector lever D range

Test procedure

1. Engine: start
2. Accelerate until the vehicle speed is 89

− 97 km/h (55 − 60 mph).

3. Travel for 200 seconds or more while keeping the vehicle speed at 89

− 97 km/h (55 − 60 mph).

4. While keeping the accelerator pedal opening degree constant, keep the vehicle speed at 89

− 97

km/h (55

− 60 mph) and travel for 150 seconds or more. (During monitor)

5. Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position.
6. Confirm that the diagnostic trouble code (DTC) is not output.
7. If DTC P0441 is output, refer to GROUP 13A, DTC P0441

− Evaporative Emission System

Incorrect Purge Flow

P.13Ac-404

.

If DTC P0442 is output, refer to GROUP 13A, DTC P0442

− Evaporative Emission System Leak

Detected (Small Leak)

P.13Ac-406

.

If DTC P0451 is output, refer to GROUP 13A, DTC P0451

− Evaporative Emission System

Pressure Sensor Range/performance

P.13Ac-436

.

If DTC P0452 is output, refer to GROUP 13A, DTC P0452

− Evaporative Emission System

Pressure Sensor Low Input

P.13Ac-452

.

If DTC P0453 is output, refer to GROUP 13A, DTC P0453

− Evaporative Emission System

Pressure Sensor High Input

P.13Ac-467

.

If DTC P0455 is output, refer to GROUP 13A, DTC P0455

− Evaporative Emission System Leak

Detected (Gross Leak)

P.13Ac-482

.

If DTC P0456 is output, refer to GROUP 13A, DTC P0456

− Evaporative Emission System Leak

Detected (Very Small Leak)

P.13Ac-499

.

AKX01345

(3)

(2)

(1)

(4)

(5)

200 SECONDS
OR MORE

PREPARATION
PERIOD

ENGINE START

IGNITION
SWITCH:
"LOCK" (OFF)

DURING
MONITOR

150 SECONDS
OR MORE

89 - 97 km/h (55 - 60 mph)

97
(60)

64
(40)

32
(20)

0

100

50

0

VEHICLE SPEED
km/h (mph)

AB

CALCULATED
LOAD (%)

TROUBLE CODE DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

13Ab-14

.

PROCEDURE 2

.

FUEL TRIM MONITOR
DTC

P0171, P0172, P0174, P0175

Drive cycle
pattern

This monitor [from start to ignition switch "LOCK" (OFF) position] will be completed while
traveling with the following drive cycle pattern. It will take 35 minutes. You must complete this
drive twice.
NOTE: Vehicle speed and throttle opening angle should be within the shaded range.

Inspection
conditions

• Engine coolant temperature: 80 − 97°C (176 − 207°F)

• Atmospheric temperature: −10 − 60°C (14 − 140°F)

• Condition of A/T: Selector lever D range

Test
procedure

1. Engine: start
2. Accelerate until the vehicle speed is 89

− 97 km/h (55 − 60 mph).

3. Travel for 30 minutes or more while keeping the vehicle speed at 89

− 97 km/h (55 − 60

mph). (M/T: 5th speed) Carry out one gradual deceleration/acceleration returning to 89

−

97 km/h (55

− 60 mph) within 120 seconds. (During monitor)

4. Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position.
5. Confirm that the diagnostic trouble code (DTC) is not output.
6. If DTC P0171 is output, refer to GROUP 13A, DTC P0171

− System too lean (Bank1)

P.13Ac-273

.

If DTC P0172 is output, refer to GROUP 13A, DTC P0172

− System too rich (Bank1)

P.13Ac-280

.

If DTC P0174 is output, refer to GROUP 13A, DTC P0174

− System too lean (Bank2)

P.13Ac-284

.

If DTC P0175 is output, refer to GROUP 13A, DTC P0175

− System too rich (Bank2)

P.13Ac-291

.

(3)

(2)

(1)

(4)

30 MINUTES OR MORE
89 - 97 km/h (55 - 60 mph)

WITH 120 SECONDS

ENGINE START

IGNITION SW-
ITCH: "LOCK"
(OFF)

DURING MONITOR

97
(60)

64
(40)

32
(20)

0

100

50

0

VEHICLE SPEED
km/h (mph)

AKX01346AB

CALCULATED
LOAD (%)

TROUBLE CODE DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

13Ab-15

PROCEDURE 3

.

CATALYTIC CONVERTER MONITOR
DTC

P0421, P0431

Drive cycle
pattern

This monitor [from start to ignition switch "LOCK" (OFF) position] will be completed while
traveling with the following drive cycle pattern. It will take 20 minutes. You must complete this
drive twice.
NOTE: Vehicle speed and throttle opening angle should be within the shaded range.

Inspection
conditions

• Atmospheric temperature: -10°C (14°F) or more

• A/C switch: OFF

• Condition of A/T: Selector lever D range

Test
procedure

1. Engine: start
2. Accelerate until the vehicle speed is 72 km/h (45 mph).
3. Travel for 300 seconds or more while keeping the vehicle speed at 72

− 97 km/h (45 − 60

mph).

4. Decelerate until the vehicle speed is within 56

− 64 km/h (35 − 40 mph).

5. While keeping the accelerator pedal opening degree constant, keep the vehicle speed at

56

− 64 km/h (35 − 40 mph) and travel for 90 seconds or more. (During monitor)

6. Fully close the throttle and decelerate, and keep the deceleration state for 10 seconds.

Then, quickly accelerate until the vehicle speed reaches 56

− 64 km/h (35 − 40 mph).

Then, repeat steps 5 and 6, and complete six monitor sessions.

7. Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position.
8. Confirm that the diagnostic trouble code (DTC) is not output.
9. If DTC P0421 is output, refer to GROUP 13A, DTC P0421

− Warm Up Catalyst Efficiency

Below Threshold (Bank 1)

P.13Ac-398

.

If DTC P0431 is output, refer to GROUP 13A, DTC P0431

− Warm Up Catalyst Efficiency

Below Threshold (Bank 2)

P.13Ac-401

.

(3)

(2)

(1)

(4)

(5)

(5)

(6)

(6)

(6)

(5)

(5)

(7)

300 SECONDS OR MORE
72 - 97 km/h (45 - 60 mph)

PREPARATION
PERIOD

ENGINE
START

IGNITION
SWITCH:
"LOCK"
(OFF)

1 ST
MON-
ITOR

FULL
DECEL-
ERATION

FULL
DECEL-
ERATION

FULL
DECEL-
ERATION

2 ND
MON-
ITOR

6 TH
MON-
ITOR

90 SECONDS OR MORE

56 - 64 km/h (35 - 40 mph)

97
(60)

64
(40)

32
(20)

0

100

50

0

VEHICLE
SPEED
km/h (mph)

AKX01347AB

CALCULATED
LOAD (%)

TROUBLE CODE DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

13Ab-16

PROCEDURE 4

.

HEATED OXYGEN SENSOR MONITOR
DTC

P0133, P0139, P0153, P0159

Drive cycle
pattern

This monitor [from start to ignition switch "LOCK" (OFF) position] will be completed while
traveling with the following drive cycle pattern. It will take 5 minutes. You must complete this
drive twice.
NOTE: Vehicle speed and throttle opening angle should be within the shaded range.

Inspection
conditions

• Engine coolant temperature: 80°C (176°F) or more

• Atmospheric temperature: -10°C (14°F) or more

• Condition of A/T: Selector lever D range

Test
procedure

1. Engine: start
2. Accelerate until the vehicle speed is 56

− 64 km/h (35 − 40 mph).

3. While keeping the accelerator pedal opening degree constant, keep the vehicle speed at

56

− 64 km/h (35 − 40 mph) and travel for 120 seconds or more. (During monitor)

4. Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position.
5. Confirm that the diagnostic trouble code (DTC) is not output.
6. If DTC P0133 is output, refer to GROUP 13A, DTC P0133

− O

2

Sensor Circuit Slow

Response (Bank 1 Sensor 1)

P.13Ac-130

.

If DTC P0139 is output, refer to GROUP 13A, DTC P0139

− O

2

Sensor Circuit Slow

Response (Bank 1 Sensor 2)

P.13Ac-176

.

If DTC P0153 is output, refer to GROUP 13A, DTC P0153

− O

2

Sensor Circuit Slow

Response (Bank 2 Sensor 1)

P.13Ac-214

.

If DTC P0159 is output, refer to GROUP 13A, DTC P0159

− O

2

Sensor Circuit Slow

Response (Bank 2 Sensor 2)

P.13Ac-260

.

(3)

(2)

(1)

(4)

120 SECONDS OR MORE
56 - 64 km/h (35 - 40 mph)

ENGINE
START

IGNITION
SWITCH: "LOCK"
(OFF)

DURING MONITOR

97
(60)

64
(40)

32
(20)

0

100

50

0

VEHICLE SPEED
km/h (mph)

AKX01348 AB

CALCULATED
LOAD (%)