Mitsubishi Lancer Evolution X. Manual - part 370

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-545

STEP 10. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).

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) Turn the ignition switch to the "ON" position.
(3) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P0606 set?

YES : Replace the ECM. When the ECM is replaced, 

register the ID code. Refer to GROUP 42B, Diagnosis 
− ID Code Registration Necessity Judgment Table 

<Vehicles with KOS> 

P.42B-11

 or GROUP 42C, 

Diagnosis − ID Codes Registration Judgment Table 

<Vehicles with WCM> 

P.42C-9

. Then go to Step 11.

NO :  It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use Troubleshooting/ 
Inspection Service Points − How to Cope with 

Intermittent Malfunctions 

P.00-15

.

STEP 11. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).

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) Turn the ignition switch to the "ON" position.
(3) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P0606 set?

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

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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DTC P0622: Generator FR Terminal Circuit Malfunction

.

CIRCUIT OPERATION

• The ECM (terminal No. 61) apply a battery volt-

age into the generator FR terminal No. 4 via 
resistance inside the unit.

.

TECHNICAL DESCRIPTION

• When the generator field coils are controlled, the 

generator FR terminal inputs signal to the ECM.

• The ECM detects the generator output with the 

input signal, and controls the idle air control 
motor according to the generator output.

.

AK604253

1

2

3 4 5 6 7 8 9 10 11 12 13 14 15 16

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49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

3 4

2

1

AD

GENERATOR

RED-WHITE

61

4 

GENERATOR CIRCUIT

B-111

(MU802066)

B-09

ENGINE
CONTROL
MODULE

IC VOLTAGE
REGULATOR

AK704227

Connector: B-09

ECM

B-09 (GR)

AB

AK704288

Connector: B-111

B-111 (GR)

AB

Generator

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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DTC SET CONDITIONS

Check Condition

• Engine speed is higher than 50 r/min.

Judgement Criterion

• Input voltage from the generator FR terminal has 

continued to be battery positive voltage for 20 
seconds.

.

FAIL-SAFE AND BACKUP FUNCTION

• Prohibits generator output suppression control 

against current consumers. (Operates as a nor-
mal generator.)

.

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

• Generator failed.
• Open circuit in generator FR terminal circuit, har-

ness damage or connector damage.

• ECM failed. 

DIAGNOSIS

Required Special Tools:

• MB991958: Scan tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A

• MB992110: Power Plant ECU Check Harness

STEP 1. Check harness connector B-09 at ECM connector 
for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 2.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 8.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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STEP 2. Measure the voltage at ECM connector B-09 by 
using power plant ECU check harness special tool 
MB992110.
(1) Disconnect all ECM connectors. Connect the power plant 

ECU check harness special tool MB992110 between the 
separated connectors.

(2) Start the engine and run at idle.

(3) Measure the voltage between terminal No. 61 and ground.

NOTE: Vehicle for Canada, the headlight, taillight, etc. 
remain lit even when the lighting switch is in "OFF" position 
but this is no problem for checks.

a. Engine: warming up
b. Radiator fan: stopped

c. Headlight switch: OFF to ON

d. Rear defogger switch: OFF to ON
e. Stoplight switch: OFF to ON

• Voltage should be drop.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Did the measured voltage drop?

YES : Go to Step 3.
NO :  Go to Step 4.

AK604040

ECM

AB

Body side harness 

MB992110

AK604214

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2

1

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64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49

AB

Power plant ECU
check harness connector