Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 125

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-199

STEP 17. Check the camshaft position sensor vane.

Q: Is the vane 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,

Procedure 6

−

Other Monitor (

P.13A-5

).

(2) Check the diagnostic trouble code (DTC).

Q: Is the DTC P0340 is output?

YES : Retry the troubleshooting.
NO : The inspection is complete.

DTC P0401: Exhaust Gas Recirculation Flow Insufficient Detected

TECHNICAL DESCRIPTION

•

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

•

The ECM <M/T> or PCM <A/T> checks how the
EGR gas flow signal changes.

DTC SET CONDITIONS

Check Conditions

•

At least twenty seconds have passed since the
last monitor was complete.

•

Engine coolant temperature is higher than 82

°

C

(180

°

F).

•

Engine speed is at between 1,000 and 2,000 <M/
T> or 940 and 2,000 <A/T> r/min.

•

Intake air temperature is higher than 5

°

C (41

°

F).

•

Barometric pressure is higher than 76 kPa (11
psi).

•

Vehicle speed is 5 km/h (3.1 mph) <M/T> or 30
km/h (18.7 mph) <A/T> or more.

•

At least ninety seconds have passed since
manifold differential pressure sensor output
voltage fluctuated 1.5 volts or more.

•

The throttle valve is closed.

•

Volumetric efficiency is lower than 15 <M/T> or
24 <A/T> percent.

•

While fuel is being shut off. <M/T>

•

Monitoring time: 2 seconds.

Judgement Criteria

•

The intake manifold pressure fluctuations are
minimal. When the EGR solenoid is turned ON.

•

Three monitors during one drive cycle

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 solenoid failed.

•

Open or shorted EGR solenoid circuit, or loose
connector.

•

Manifold differential pressure sensor failed.

•

ECM failed. <M/T>

•

PCM failed. <A/T>

DIAGNOSIS

Required Special Tools
MB991502: Scan Tool (MUT-II)

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

−

Exhaust Gas

Recirculation (EGR) System - EGR System Check (

P.17-98

).

Q: Are there any abnormalities?

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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STEP 2. Using scan tool MB991502, check data list item 95:
Manifold Differential Pressure Sensor.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991502 to the data reading mode for item

95, Manifold Differential Pressure Sensor.

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

°

C to 96

°

C(176

°

F to 205

°

F).

•

Should be between 62

−

76 kPa 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 P1400

−

Manifold Differential Pressure

Sensor Circuit Malfunction (

P.13A-324

).

STEP 3. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to,

Procedure 5

−

Exhaust Gas Recirculation (EGR) System

Monitor (

P.13A-5

).

(2) Check the diagnostic trouble code (DTC).

Q: Is the DTC P0401 is output?

YES : Retry the troubleshooting.
NO : The inspection is complete.

AKX01177

16 PIN

MB991502

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-201

DTC P0403: Exhaust Gas Recirculation Solenoid Malfunction

AK000665

3 4

1 2

1 2

5 6

3 4
7 8

2

1

RED-

WHITE

RED-

WHITE

RED-

WHITE

RED

RED

BLUE-

RED

BLUE-

RED

BATTERY

MFI
RELAY

A-21X

B-13
MU802749

B-31

EGR SOLENOID

1

1

2

2

3

4

5

6

6

ENGINE CONTROL
MODULE(ECM)<M/T>
OR
POWERTRAIN CONTROL
MODULE(PCM)<A/T>

2

3 4

5 6

7 8

9

11 12 13 14 15 16 17 18 19 20

30

21 22 23

24 25

26 27 28 29

3132 33

34 35

1

14

4

19

5

22

6

17

8

15

9

18

7

20

16

2

13

12

23 24 25 26

21

1

3

10

C-49<M/T>
(MU803773)

C-50<A/T>
(MU803784)

10 11

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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TECHNICAL DESCRIPTION

•

The EGR solenoid power is supplied from the
MFI relay (terminal 1).

•

The ECM <M/T> or PCM <A/T> controls the EGR
solenoid ground by turning the power transistor in
the ECM <M/T> or PCM <A/T> "ON" and "OFF."

BACKGROUND

•

The ECM <M/T> or PCM <A/T> checks current
flows in the EGR solenoid drive circuit when the
EGR solenoid is "ON" and "OFF."

DTC SET CONDITIONS

Check Conditions

•

Battery positive voltage is higher than 10 volts.

Judgment Criteria

•

The EGR solenoid coil surge voltage (battery
positive voltage + 2 volts) is not detected when
the EGR solenoid is turned from "ON" to "OFF."

•

Only one monitor during one drive cycle

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

•

EGR solenoid failed.

•

Open or shorted EGR solenoid circuit, or loose
connector.

•

ECM failed. <M/T>

•

PCM failed. <A/T>

DIAGNOSIS

Required Special Tools
MB991502: Scan Tool (MUT-II)

ACX02513

EGR
SOLENOID
VALVE

CONNECTOR:B-31

AI

AK000280

C-49,C-50

ECM<M/T>
OR
PCM<A/T>

CONNECTORS:C-49<M/T>,C-50<A/T>

BC

AK000547AB

CONNECTOR:B-13

AK000226

AK000226AB

CONNECTOR : A-21X

MFI RELAY