Mitsubishi Montero (2004+). Manual - part 133

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-19

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 
driving the vehicle 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 to 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 DTC P0171 

− System too lean (Bank1) 

P.13A-367

.

If DTC P0172 is output, refer to DTC P0172 

− System too rich (Bank1) 

P.13A-375

.

If DTC P0174 is output, refer to DTC P0174 

− System too lean (Bank2) 

P.13A-381

.

If DTC P0175 is output, refer to DTC P0175 

− System too rich (Bank2) 

P.13A-389

.

AKX01346

AKX01346

(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)

AKX01346 AB

CALCULATED
LOAD (%)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-20

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 
driving the vehicle 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 DTC P0421 

− Warm Up Catalyst Efficiency Below 

Threshold (Bank 1) 

P.13A-513

.

If DTC P0431 is output, refer to DTC P0431 

− Warm Up Catalyst Efficiency Below 

Threshold (Bank 2) 

P.13A-517

.

AKX01347

(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 (%)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-21

.

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 
driving the vehicle 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 DTC P0133 

− O

2

 Sensor Circuit Slow Response (Bank 1 

Sensor 1) 

P.13A-196

. 

If DTC P0139 is output, refer to DTC P0139 

− O

2

 Sensor Circuit Slow Response (Bank 1 

Sensor 2) 

P.13A-250

.

If DTC P0153 is output, refer to DTC P0153 

− O

2

 Sensor Circuit Slow Response (Bank 2 

Sensor 1) 

P.13A-296

. 

If DTC P0159 is output, refer to DTC P0159 

− O

2

 Sensor Circuit Slow Response (Bank 2 

Sensor 2) 

P.13A-350

.

AKX01348

AKX01348

(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 (%)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-22

.

PROCEDURE 5

.

EXHAUST GAS RECIRCULATION (EGR) SYSTEM MONITOR
DTC

P0401

Drive cycle 
pattern

This monitor [from start to ignition switch "LOCK" (OFF) position] will be completed while 
driving the vehicle with the following drive cycle pattern. It will take 10 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: 5°C (41°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 56 

− 64 km/h (35 − 40 mph).

3. Travel for 20 seconds or more while keeping the vehicle speed at 56 

− 64 km/h (35 − 40 

mph).

4. Fully close the throttle from an engine speed of 2,000 

− 3,000 r/min, and while keeping 

the clutch engaged, decelerate to approximately 900 r/min without applying the brakes. 
Do not steer the handle or turn the light ON/OFF during this time. (During monitor)

5. Accelerate until the vehicle speed reaches 56 

− 64 km/h (35 − 40 mph), and travel for 20 

seconds or more. Then, repeat steps 4 and 5 and complete 8 monitor sessions.

6. Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position.
7. Confirm that the diagnostic trouble code (DTC) is not output.
8. If DTC P0401 is output, refer to DTC P0401 

− Exhaust Gas Recirculation Flow Insufficient 

detected 

P.13A-500

.

AKX01349

(2)

AKX01349

(3)

(5)

(5)

(5)

(5)

(2)

(1)

(4)

(4)

(4)

(4)

(4)

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

20 SECONDS OR MORE

1 ST
MON-
ITOR

7 TH
MON-
ITOR

8 TH
MON-
ITOR

2 ND
MON-
ITOR

ENGINE START

IGNITION 
SWITCH:"LOCK" 
(OFF)

FULL
DECEL-
ERATION

FULL
DECEL-
ERATION

FULL
DECEL-
ERATION

FULL
DECEL-
ERATION

FULL
DECEL-
ERATION

64
(40)

32
(20)

0

100

50

0

VEHICLE 
SPEED
km/h (mph)

AKX01349AB

CALCULATED
LOAD (%)