Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual - part 266

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-263

STEP 9. Check for short circuit to ground between
camshaft position sensor connector B-22 terminal 5 and
ECM connector C-58 terminal 50 <M/T> or PCM connector
C-55 terminal 56 <A/T>.
Q: Is the harness wire in good condition?

YES : Replace the ECM or PCM. Then go to Step 18.
NO : Repair it. Then go to Step 18.

STEP 10. Check the power supply voltage at camshaft
position sensor connector B-22.
(1) Disconnect the connector B-22 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 6 and ground.

•

Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the voltage normal?

YES : Go to Step 12.
NO : Go to Step 11.

STEP 11. Check connector A-21X at MFI relay for damage.
Q: Is the connector in good condition?

YES : Repair harness wire between MFI relay connector A-

21X terminal 1 and camshaft position sensor
connector B-22 terminal 6 because of open circuit or
short circuit to ground. Then go to Step 18.

NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 18.

AK000217AB

AK000217

CONNECTOR : B-22

AK000225

CONNECTOR : C-58<M/T>, C-55<A/T>

C-55

C-58

PCM<A/T>

ECM<M/T>

AK000252AB

B-22 HARNESS
SIDE CONNECTOR

7 6 5 4 3 2 1

AK000226

AK000226AB

CONNECTOR : A-21X

MFI RELAY

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-264

STEP 12. Check the continuity at camshaft position sensor
connector B-22.
(1) Disconnect the connector B-22 and measure at the harness

side.

(2) Check for the continuity between terminal 7 and ground.

•

Should be less than 2 ohm.

Q: Is the continuity normal?

YES : Go to Step 13.
NO : Repair harness wire between camshaft position

sensor connector B-22 terminal 7 and ground
because of open circuit or harness damage. Then go
to Step 18.

STEP 13. Check connector A-21X at the MFI relay for
damage.
Q: Is the connector in good condition?

YES : Go to Step 14.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 18.

STEP 14. Check connector C-58 at ECM <M/T> or
connector C-55 at PCM <A/T> for damage.
Q: Is the connector in good condition?

YES : Go to Step 15.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 18.

AK000253AB

B-22 HARNESS
SIDE CONNECTOR

7 6 5 4 3 2 1

AK000226

AK000226AB

CONNECTOR : A-21X

MFI RELAY

AK000225

CONNECTOR : C-58<M/T>, C-55<A/T>

C-55

C-58

PCM<A/T>

ECM<M/T>

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-265

STEP 15. Check for harness damage between MFI relay
connector A-21X terminal 1 and camshaft position sensor
connector B-22 terminal 6.
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 B-22 terminal 5 and ECM
connector C-58 terminal 50 <M/T> or PCM connector C-55
terminal 56 <A/T>.
Q: Is the harness wire in good condition?

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

AK000226

AK000226AB

CONNECTOR : A-21X

MFI RELAY

AK000217AB

AK000217

CONNECTOR : B-22

AK000217AB

AK000217

CONNECTOR : B-22

AK000225

CONNECTOR : C-58<M/T>, C-55<A/T>

C-55

C-58

PCM<A/T>

ECM<M/T>

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-266

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.13B-4

(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 77

(141

F).

•

Engine speed is at between 1,000 and 1,650 <M/
T> or 910 and 1,650 <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 18 <M/T> or
28 <A/T> percent.

•

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.

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