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Mitsubishi Montero (2002-2004). Manual - part 565

TROUBLE CODE DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

13Ab-17

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
traveling 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 GROUP 13A, DTC P0401

− Exhaust Gas Recirculation

Flow Insufficient detected

P.13Ac-388

(2)

(3)

(5)

(2)

(1)

(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

64
(40)

32
(20)

100

VEHICLE
SPEED
km/h (mph)

AKX01349AB

CALCULATED
LOAD (%)

TROUBLE CODE DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

13Ab-18

PROCEDURE 6

OTHER MONITOR (Main components, sensors and switches, wire breakage and short circuit)
DTC

• Main components: P0134, P0154, P0300, P0301, P0302, P0303, P0304, P0305, P0306,

P0506, P0507, P1400

• Sensors and switches: P0101, P0102, P0106, P0107, P0108, P0111, P0112, P0113,

P0116, P0117, P0118, P0122, P0123, P0125, P0181, P0182, P0183, P0335, P0340,
P0461

• Wire breakage and short circuit: P0130, P0131, P0132, P0135, P0136, P0137, P0138,

P0141, P0150, P0151, P0152, P0155, P0156, P0157, P0158, P0161, P0201, P0202,
P0203, P0204, P0205, P0206, P0403, P0443, P0446

TROUBLE CODE DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

13Ab-19

Drive cycle
pattern

Inspection
conditions

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

• Atmospheric temperature: 5°C (41°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), and travel for 300

seconds or more.

3. Return the vehicle to the shop.
4. After stopping the vehicle, continue idling for 300 seconds, and then turn the ignition

switch to the "LOCK" (OFF) position. Moreover, the vehicle should be set to the following
conditions for idling.
• A/C switch: OFF

• Lights and all accessories: OFF

• Transmission: P range

• Steering wheel: Straightforward position

5. Confirm that the diagnostic trouble code (DTC) is not output.
6. If a DTC is displayed, refer to Diagnostic Trouble Code Chart

P.13Ab-22

OTHER MONITOR (Main components, sensors and switches, wire breakage and short circuit)

(3)

(2)

(1)

(4)

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

ENGINE: IDLING
TRANSMISSION: NEUTRAL
300 SECONDS

ENGINE START

IGNITION
SWITCH:"LOCK"
(OFF)

64
(40)

32
(20)

100

VEHICLE
SPEED
km/h (mph)

AKX01350AB

CALCULATED
LOAD (%)

FAIL-SAFE FUNCTION REFERENCE TABLE

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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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READINESS TEST STATUS

PURPOSE
The Readiness function also referred as I/M Readi-
ness or I/M Flags indicate if a full diagnostic check
has been "Completed" (is "Ready") for each non-
continuous monitor. Enhanced I/M State Emission
Programs will use the Readiness status (Codes) to
see if the vehicle is ready for OBD-II testing. "Incom-
plete" (Not Ready) codes will be one of the triggers
for I/M failure.

OVERVIEW
The PCM monitors the following main diagnosis
items and records whether the evaluation was com-
pleted or is incomplete. The Readiness codes were
established for the I/M programs, thereby confirming
that the vehicle was not tampered with by erasing the
diagnostic trouble code(s) (DTC's) before I/M testing.
The Readiness and DTC codes can be reset by dis-
connecting the battery or by erasing the codes with a
scan tool. For this reason all Readiness codes must
read "Complete" before I/M testing.

When the monitors run and complete, the MUT-II will
record the Readiness Code as " Complete " (General
Scan Tools record as " Ready "). When the vehicle is
operating normally and the OBD-II Drive Cycle is car-
ried out, Readiness Code will set as " Complete " on
the first drive cycle. If during the first drive cycle a
fault is detected then, a second drive is required
before the Readiness Code will " Complete. " If the
fault is still there, then a DTC will set.

• Catalyst: P0421, P0431

• Evaporative system: P0442, P0455, P0456

• Heated oxygen sensor: P0133, P0153

• Heated oxygen sensor heater: P0135, P0141,

P0155, P0161

• EGR system: P0401

After the Readiness is "Complete," the technician is
assured that any DTC's associated with that monitor
will be displayed if the system has a problem. That is
why some State's I/M programs require the Readi-
ness Code as "Complete" before they check for
DTC's.
NOTE: After a repair is mode for a DTC the techni-
cian should drive the OBD-II drive cycle checking
that the MUT-II records all Readiness as "Complete".

FAIL-SAFE FUNCTION REFERENCE TABLE

M1131153000170

When the main sensor malfunctions are detected by
the diagnostic test mode, the vehicle is controlled by
means of the following defaults.

MALFUNCTION ITEM

CONTROL CONTENTS DURING MALFUNCTION

Volume airflow sensor

• Uses the throttle position sensor signal and engine speed signal (crankshaft

position sensor signal) for basic injector drive time and basic ignition timing
from the pre-set mapping.

• Fixes the IAC motor in the appointed position so idle air control is not

performed.

Intake air temperature
sensor

Controls as if the intake air temperature is 25

°C (77°F).

Engine coolant
temperature sensor

Controls as if the engine coolant temperature is 80

°C (176°F). (This control will

be continued until the ignition switch is turned to " LOCK " (OFF) position even
though the sensor signal returns to normal.)

Camshaft position sensor Injects fuel simultaneously into all cylinders. (After the ignition switch is turned to

" ON " position, the No.1 cylinder top dead center is not detected at all.)

Barometric pressure
sensor

Controls as if the barometric pressure is 101 kPa (30 in.Hg).

Knock sensor

Switches the ignition timing from ignition timing for high octane to ignition timing
for standard octane fuel.

Heated oxygen sensor
<front>

Air/fuel ratio closed loop control is not performed.

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