Mitsubishi Montero Sport (2004+). Manual - part 267

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-481

NOTE: Check harness after checking intermediate connector
C-14. If intermediate connector is damaged, repair or replace it.
Refer to GROUP 00E, Harness Connector Inspection

P.00E-2

Then go to Step 18.
Q: Is the harness wire in good condition?

YES : Go to Step 16.
NO : Repair it. Then go to Step 18.

STEP 16. Check for harness damage between camshaft
position sensor connector A-42 (terminal No. 2) and PCM
connector C-90 (terminal No. 56).
Q: Is the harness wire in good condition?

YES : Go to Step 17.
NO : Repair it. Then go to Step 18.

AK200488

CONNECTOR: A-42

A-42(GR)

HARNESS
CONNECTOR:
COMPONENT SIDE

CAMSHAFT
POSITION
SENSOR

AK103762

46 45 44

CONNECTOR: C-90

C-90(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-482

STEP 17. Check the camshaft position sensing cylinder.
Q: Is the camshaft position sensing cylinder in a good

condition?
YES : Replace the camshaft position sensor. Then go to

Step 18.

NO : Repair it. Then go to Step 18.

STEP 18. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to

Diagnostic Function

− OBD-II Drive Cycle − Procedure 6 −

Other Monitor

P.13A-4

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0340 set?

YES : Repeat the troubleshooting.
NO : The procedure is complete.

DTC P0401: Exhaust Gas Recirculation Flow Insufficient Detected

TECHNICAL DESCRIPTION

• When the EGR vacuum regulator solenoid valve

switches from "OFF" to "ON" while the engine is
running, EGR gas flows.

• The PCM checks how the EGR gas flow signal

changes.

DESCRIPTIONS OF MONITOR METHODS
Small manifold pressure change during exhaust gas

recirculation (EGR) operation from closed to
open.

MONITOR EXECUTION
Continuous

MONITOR EXECUTION CONDITIONS (Other
monitor and Sensor)

Other Monitor (There is no temporary DTC stored

in memory for the item monitored below)

• EGR vacuum regulator solenoid valve monitor

Sensor (The sensor below is determined to be

normal)

• Volume airflow sensor

• Engine coolant temperature sensor

• Intake air temperature sensor

• Barometric pressure sensor

• Throttle position sensor

• Manifold absolute pressure sensor

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-483

DTC SET CONDITIONS

Logic Flow Chart

Check Conditions

• At least 20 seconds have passed since the last

monitor was complete.

• Engine coolant temperature is higher than 76°C

(169

°F).

• Engine speed is at between 910 and 1,650 r/min.

• Intake air temperature is higher than -10°C

(14

°F).

• Barometric pressure is higher than 76 kPa (22.4

in.Hg).

• Vehicle speed is 30 km/h (18.7 mph) or more.

• At least 90 seconds have passed since manifold

absolute pressure sensor output voltage fluctu-
ated 1.5 volts or more.

• The throttle valve is closed.

• Volumetric efficiency is lower than 28 percent.

• The PCM monitors for this condition for 3 cycles

of 2 seconds each during the drive cycle.

START

END

YES

MALFUNCTION

GOOD

MONITORING

CONDITIONS

MEASURE MANIFOLD

PRESSURE (P1)

MEASURE MANIFOLD

PRESSURE (P2)

EGR VALVE OPEN

P2 - P1 < P0 *

SPECIFIED TIMES

AK204016

P0 : THRESHOLD VALUE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-484

Judgement Criteria

• When intake manifold pressure fluctuations width

is lower than 2.0 kPa (0.59 in.Hg). When the
EGR vacuum regulator solenoid valve is turned
ON.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function

− OBD-II Drive Cycle −

Procedure 5

− Exhaust Gas Recirculation (EGR)

System Monitor

P.13A-4

TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)

• EGR valve does not open.

• EGR control vacuum is too low.

• EGR vacuum regulator solenoid valve failed.

• Open or shorted EGR vacuum regulator solenoid

valve circuit, or connector damage.

• Manifold absolute pressure sensor failed.

• PCM failed.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I

• MB991827: USB Cable

• MB991911: Main Harness B

STEP 1. Check the EGR system
Refer to GROUP 17, Emission Control System

− Exhaust Gas

Recirculation (EGR) System

− General Information

P.17-111

Q: Are there any abnormalities?

YES : Go to Step 2.
NO : Repair it. Then go to Step 3.

STEP 2. Using scan tool MB991958, check data list item 95:
Manifold Absolute Pressure Sensor.

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item

95, Manifold Absolute Pressure Sensor.

(4) Warm up the engine to normal operating temperature: 80

°C

to 95

°C (176°F to 203°F).

• Should be between 16 − 36 kPa (4.7 − 10.6 in.Hg) at

engine idling.

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?

YES : Clean the EGR valve and EGR passage. Then go to

Step 3.

NO : Refer to DTC P0106

− Manifold Absolute Pressure

Sensor Circuit Range/Performance Problem

P.13A-51

, DTC P0107

− Manifold Absolute Pressure

Sensor Circuit Low Input

P.13A-62

, DTC P0108

−

Manifold Absolute Pressure Sensor Circuit High Input

P.13A-78

AK303629AB

MB991911

MB991827

MB991824

16-PIN

Content .. 265 266 267 268 ..