Mitsubishi Montero (2004+). Manual - part 417

EMISSION CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-75

INSPECTION

M1173004900163

EVAPORATIVE EMISSION VENTILATION 
SOLENOID CHECK

1. Connect a hand vacuum pump to nipple (A) of the solenoid.
2. Check air tightness by applying a vacuum with voltage 

applied directly from the battery to the evaporative emission 
ventilation solenoid and without applying voltage.

3. Measure the resistance between the terminals of the 

solenoid.

Standard value: 17 

− 21 Ω [at 20°C (68°F)]

CATALYTIC CONVERTER

GENERAL DESCRIPTION (CATALYTIC CONVERTER)

M1173005300131

The three way catalytic converter, together with the 
closed loop air-fuel ratio control based on the oxygen 
sensor signal, oxidizes carbon monoxides (CO) and 
hydrocarbons (HC), also reduces nitrogen oxides 
(NOx). 

When the mixture is controlled at stoichiometric 
air-fuel ratio, the three way catalytic converter pro-
vides the highest purification against the three con-
stituents, namely, CO, HC and NOx.

BATTERY VOLTAGE

NORMAL CONDITION

Applied

Vacuum maintained

Not applied

Vacuum leaks

AC101980AB

A

AC101981AB

EMISSION CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-76

REMOVAL AND INSTALLATION

M1173003900416

Required Special Tool:

• MD998770: Oxygen Sensor Wrench

REMOVAL SERVICE POINT

.

<<A>> RIGHT BANK HEATED OXYGEN SENSOR 
(REAR)/LEFT BANK HEATED OXYGEN SENSOR 
(REAR)/LEFT BANK HEATED OXYGEN SENSOR (FRONT) 
REMOVAL
Use special tool MD998770 to remove the oxygen sensor.

Pre-removal and Post-installation Operation
Front Under Cover Removal and Installation

AC000176

44 ± 5 N·m
33 ± 3 ft-lb

1,2,3

1

2

3

4

5

6

7

N

N

N

25 ± 4 N·m
18 ± 3 ft-lb

49 ± 10 N·m
37 ± 7 ft-lb

49 ± 4 N·m
37 ± 3 ft-lb

49 ± 10 N·m
37 ± 7 ft-lb

49 ± 10 N·m
37 ± 7 ft-lb

AB

REMOVAL STEPS

<<A>> >>A<<

1. RIGHT BANK HEATED OXYGEN 

SENSOR (REAR)

<<A>> >>A<<

2. LEFT BANK HEATED OXYGEN 

SENSOR (REAR)

<<A>> >>A<<

3. LEFT BANK HEATED OXYGEN 

SENSOR (FRONT)

4. WARM UP THREE WAY CATALYTIC 

CONVERTER

5. GASKET
6. BRACKET
7. SEAL RING
8. CATALYTIC CONVERTER
9. GASKET

REMOVAL STEPS (Continued)

ACX02426 AB

MD998770

SPECIFICATIONS

TSB Revision

ENGINE AND EMISSION CONTROL

17-77

INSTALLATION SERVICE POINT

.

>>A<< LEFT BANK HEATED OXYGEN SENSOR 
(FRONT)/LEFT BANK HEATED OXYGEN SENSOR 
(REAR)/RIGHT BANK HEATED OXYGEN SENSOR (REAR) 
INSTALLATION
Use special tool MD998770 to install the oxygen sensor.

SPECIFICATIONS

FASTENER TIGHTENING SPECIFICATIONS

M1173006400346

SERVICE SPECIFICATIONS

M1173000300341

ACX02426 AB

MD998770

ITEM

SPECIFICATION

Emission control system
Bracket bolt

49 

± 10 N⋅m (37 ± 7 ft-lb)

Front exhaust pipe bolt

25 

± 4 N⋅m (18 ± 3 ft-lb)

Heated oxygen sensor

44 

± 5 N⋅m (33 ± 3 ft-lb)

Main muffler nut

49 

± 10 N⋅m (37 ± 7 ft-lb)

Warm up three way catalytic converter bolt

49 

± 4 N⋅m (37 ± 3 ft-lb)

Warm up three way catalytic converter nut

49 

± 10 N⋅m (37 ± 7 ft-lb)

Engine control system
Accelerator pedal bracket nut

12 

± 2 N⋅m (102 ± 22 in-lb)

Accelerator pedal position sensor bolt

3.5 

± 1.0 N⋅m (31 ± 9 in-lb)

ITEMS

STANDARD VALUE

Emission control system

Purge flow cm

3

/s (SCFH) [at 80 

− 95°C (176 − 205°F) with sudden revving]

20 (2.5)

Evaporative emission purge solenoid coil resistance [at 20

°C (68°F)] Ω

30 

− 34

EGR valve (Stepper Motor) connector resistance [at 20

°C (68°C)] Ω

10 

− 20

Evaporative emission ventilation solenoid coil resistance [at 20

°C (68°C)] Ω

17 

− 21

NOTES