Mitsubishi Montero (2004+). Manual — part 129

GENERAL DESCRIPTION

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-3

MULTIPORT FUEL INJECTION (MFI) SYSTEM DIAGRAM

NOTE: For the vacuum routing, refer to GROUP 17,
Emission Control System

−

Vacuum Hoses

−

Vac-

uum Hose Routing

P.17-61

.

AK303011

1 LEFT BANK HEATED OXYGEN SENSOR (FRONT)
2 VOLUME AIRFLOW SENSOR
3 INTAKE AIR TEMPERATURE SENSOR
4 THROTTLE POSITION SENSOR (MAIN/SUB)
5 CAMSHAFT POSITION SENSOR
6 CRANKSHAFT POSITION SENSOR
7 BAROMETRIC PRESSURE SENSOR
8 ENGINE COOLANT TEMPERATURE SENSOR
9 LEFT BANK HEATED OXYGEN SENSOR (REAR)
10 RIGHT BANK HEATED OXYGEN SENSOR (FRONT)
11 RIGHT BANK HEATED OXYGEN SENSOR (REAR)
12 FUEL TANK DIFFERENTIAL PRESSURE SENSOR
13 MANIFOLD ABSOLUTE PRESSURE SENSOR
14 FUEL TANK TEMPERATURE SENSOR
15 FUEL LEVEL SENSOR

POWER SUPPLY
ACCELERATOR PEDAL POSITION SENSOR
(MAIN/SUB)
ACCELERATOR PEDAL POSITION SWITCH
VEHICLE SPEED SENSOR
A/C SWITCH 1, 2
TRANSMISSION RANGE SWITCH
POWER STEERING PRESSURE SWITCH
IGNITION SWITCH - ST
KNOCK SENSOR

1 INJECTOR
2 EVAPORATIVE EMISSION
PURGE SOLENOID
3 THROTTLE ACTUATOR CONTROL
MOTOR
4 EVAPORATIVE EMISSION
VENTILATION SOLENOID
5 EGR VALVE (STEPPER MOTOR)
6 INTAKE MANIFOLD TUNING
SOLENOID

FUEL PUMP RELAY
MULTIPORT FUEL INJECTION
(MFI) RELAY
THROTTLE ACTUATOR CONTROL
MOTOR RELAY
A/C COMPRESSER CLUTCH RELAY
MALFUNCTION INDICATOR LAMP
(SERVICE ENGINE SOON OR
CHECK ENGINE LAMP)
DIAGNOSTIC OUTPUT
IGNITION COIL, IGNITION POWER
TRANSISTER

PCM

SENSE

DECIDE

ACT

1 LEFT BANK HEATED
OXYGEN SENSOR
(FRONT)

6 CRANKSHAFT POSITION SENSOR

11 RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)

9 LEFT BANK HEATED
OXYGEN SENSOR (REAR)

5 CAMSHAFT POSITION
SENSOR

1 INJECTOR

M*

M*

6 INTAKE MANIFOLD
TUNING SOLENOID

VACUUM TANK

3 THROTTLE
ACTUATOR
CONTROL
MOTOR

2 EVAPORATIVE EMISSION
PURGE SOLENOID

5 EGR VALVE
(STEPPER
MOTOR)

4

EVAPORATIVE
EMISSION
CANISTER

FUEL
TANK

FROM
FUEL
PUMP

8

2, 7

VOLUME AIRFLOW SENSOR
(WITH BAROMETRIC
PRESSURE SENSOR)

3 INTAKE AIR
TEMPERATURE SENSOR

AIR
INLET

12 FUEL TANK
DIFFERENTIAL
PRESSURE
SENSOR

14 FUEL TANK
TEMPERATURE
SENSOR

15 FUEL
LEVEL
SENSOR

4 THROTTLE POSITION SENSOR
(MAIN/SUB)

TO
FUEL
TANK

FUEL
PRESSURE
REGULATOR

13 MANIFOLD
ABSOLUTE
PRESSURE
SENSOR

ENGINE
COOLANT
TEMPERATURE
SENSOR

10 RIGHT BANK

HEATED
OXYGEN
SENSOR
(FRONT)

NOTE
*: Manifold port

EVAPORATIVE EMISSION
VENTILATION SOLENOID

EVAPORATIVE EMISSION
VENTILATION VALVE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-4

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TROUBLESHOOTING STRATEGY

M1131150000557

NOTE: If a DTC is erased, its "freeze frame" data will
be also erased and the system readiness test status
will be reset. Store the "freeze frame" data before
erasing the DTC.
Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will be sure to have
exhausted most of the possible ways to find an MFI
fault.
1. Gather as much information as possible about the

complaint from the customer.

2. Verify that the condition described by the

customer exists.

3. Check the vehicle for any MFI Diagnostic Trouble

Code (DTC).

4. If you cannot verify the condition and there are no

DTCs, the malfunction is intermittent. For
information on how to cope with intermittent
malfunctions, refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How

to cope with Intermittent Malfunction

P.00-6

.

5. If you can verify the condition but there are no

DTCs, or the system cannot communicate with
the scan tool, refer to the trouble symptom
classification table.

6. If there is a DTC, record the number of the code,

then erase the code from the memory using the
scan tool.

7. Reconfirm the malfunction symptom and carry out

a test drive with the drive cycle pattern.

8. If DTC is set again, carry out an inspection with

appropriate diagnostic trouble code procedures.

9. If DTC is not set again, the malfunction is

intermittent. For information on how to cope with
intermittent malfunctions, refer to GROUP 00,
How to Use Troubleshooting/Inspection Service
Points

− How to cope with Intermittent Malfunction

P.00-6

.

10.After repairs are completed, conduct a road test

duplicating the complaint set conditions to confirm
the malfunction has been connected.

NOTE: If the powertrain control module (PCM) is
replaced, Immobilizer Encrypted Code Registration
should be carried out, Refer to GROUP 54A, Ignition
Switch

−

On-vehicle Service

−

Immobilizer Encrypted

Code Registration

P.54A-29

.

DIAGNOSTIC FUNCTION

M1131155500201

.

MALFUNCTION INDICATOR LAMP (SERVICE ENGINE
SOON OR CHECK ENGINE LAMP)
Among the on-board diagnostic items, a Service Engine
Soon/Malfunction Indicator Lamp illuminates to notify the driver
of an emission control malfunction.
However, when an irregular signal returns to normal and the
powertrain control module judges that it has returned to normal,
the Malfunction Indicator Lamp (SERVICE ENGINE SOON or
Check Engine Lamp) is switched off.
Moreover, when the ignition switch is turned off, the lamp is
switched off. Even if the ignition switch is turned on again, the
lamp does not illuminate until the malfunction is detected.
Immediately after the ignition switch is turned on, the Malfunc-
tion Indicator Lamp (SERVICE ENGINE SOON or Check
Engine Lamp) is lit for 20 seconds to indicate that the Malfunc-
tion Indicator Lamp (SERVICE ENGINE SOON or Check
Engine Lamp) operates normally.

.

BRAKE

SERVICE

ENGINE SOON

F

H

C

E

AT

TEMP

C / D

LOCK

100

120

2

3

4

5

AKX01463AE

MALFUNCTION INDICATOR LAMP (SERVICE
ENGINE SOON OR CHECK ENGINE LAMP)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-5

Items Indicated by the Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp)

DTC NO.

ITEMS

-

Powertrain control module (PCM) malfunction

P0101*

Volume airflow circuit range/performance problem

P0102*

Volume airflow circuit low input

P0106

Manifold absolute pressure circuit range/performance problem

P0107

Manifold absolute pressure circuit low input

P0108

Manifold absolute pressure circuit high input

P0111*

Intake air temperature circuit range/performance problem

P0112*

Intake air temperature circuit low input

P0113*

Intake air temperature circuit high input

P0116*

Engine coolant temperature circuit range/performance problem

P0117*

Engine coolant temperature circuit low input

P0118*

Engine coolant temperature circuit high input

P0122*

Throttle position sensor (main) circuit low input

P0123*

Throttle position sensor (main) circuit high input

P0125*

Insufficient coolant temperature for closed loop fuel control

P0128

Coolant thermostat (Coolant temperature below thermostat regulating temperature)

P0130

Heated oxygen sensor circuit (bank 1 sensor 1)

P0131

Heated oxygen sensor circuit low voltage (bank 1 sensor 1)

P0132

Heated oxygen sensor circuit high voltage (bank 1 sensor 1)

P0133

Heated oxygen sensor circuit slow response (bank 1 sensor 1)

P0134*

Heated oxygen sensor circuit no activity detected (bank 1 sensor 1)

P0135

Heated oxygen sensor heater circuit (bank 1 sensor 1)

P0136

Heated oxygen sensor circuit (bank 1 sensor 2)

P0137

Heated oxygen sensor circuit low voltage (bank 1 sensor 2)

P0138

Heated oxygen sensor circuit high voltage (bank 1 sensor 2)

P0139

Heated oxygen sensor circuit slow response (bank 1 sensor 2)

P0141

Heated oxygen sensor heater circuit (bank 1 sensor 2)

P0150

Heated oxygen sensor circuit (bank 2 sensor 1)

P0151

Heated oxygen sensor circuit low voltage (bank 2 sensor 1)

P0152

Heated oxygen sensor circuit high voltage (bank 2 sensor 1)

P0153

Heated oxygen sensor circuit slow response (bank 2 sensor 1)

P0154*

Heated oxygen sensor circuit no activity detected (bank 2 sensor 1)

P0155

Heated oxygen sensor heater circuit (bank 2 sensor 1)

P0156

Heated oxygen sensor circuit (bank 2 sensor 2)

P0157

Heated oxygen sensor circuit low voltage (bank 2 sensor 2)

P0158

Heated oxygen sensor circuit high voltage (bank 2 sensor 2)

P0159

Heated oxygen sensor circuit slow response (bank 2 sensor 2)

P0161

Heated oxygen sensor heater circuit (bank 2 sensor 2)

P0171

System too lean (bank 1)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-6

P0172

System too rich (bank 1)

P0174

System too lean (bank 2)

P0175

System too rich (bank 2)

P0181

Fuel tank temperature sensor circuit range/performance

P0182

Fuel tank temperature sensor circuit low input

P0183

Fuel tank temperature sensor circuit high input

P0201

Injector circuit

− cylinder 1

P0202

Injector circuit

− cylinder 2

P0203

Injector circuit

− cylinder 3

P0204

Injector circuit

− cylinder 4

P0205

Injector circuit

− cylinder 5

P0206

Injector circuit

− cylinder 6

P0222*

Throttle position sensor (sub) circuit low input

P0223*

Throttle position sensor (sub) circuit high input

P0300

Random/multiple cylinder misfire detected

P0301

Cylinder 1 misfire detected

P0302

Cylinder 2 misfire detected

P0303

Cylinder 3 misfire detected

P0304

Cylinder 4 misfire detected

P0305

Cylinder 5 misfire detected

P0306

Cylinder 6 misfire detected

P0335*

Crankshaft position sensor circuit

P0340*

Camshaft position sensor circuit

P0401

Exhaust gas recirculation flow insufficient detected

P0403

Exhaust gas recirculation control circuit

P0421

Warm up catalyst efficiency below threshold (bank 1)

P0431

Warm up catalyst efficiency below threshold (bank 2)

P0441

Evaporative emission control system incorrect purge flow

P0442

Evaporative emission control system leak detected (Small leak)

P0443

Evaporative emission control system purge control valve circuit

P0446

Evaporative emission control system vent control circuit

P0451

Evaporative emission control system pressure sensor range/performance

P0452

Evaporative emission control system pressure sensor low input

P0453

Evaporative emission control system pressure sensor high input

P0455

Evaporative emission control system leak detected (Gross leak)

P0456

Evaporative emission control system leak detected (Very small leak)

P0461

Fuel level sensor circuit range/performance

P0500*

Vehicle speed sensor malfunction

P0506

Idle control system RPM lower than expected

P0507

Idle control system RPM higher than expected

DTC NO.

ITEMS