Mitsubishi Lancer Evolution X. Manual - part 392

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-633

STEP 9. 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 P2100 set?

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

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-634

DTC P2101: Throttle Actuator Control Motor Magneto Malfunction

.

CIRCUIT OPERATION

• Controls the current that is applied from ECM 

(terminals No. 15, No. 16) to the throttle actuator 
control motor (terminals No. 1, No. 2)

.

TECHNICAL DESCRIPTION

• ECM check whether the throttle actuator control 

motor magneto has failed.

.

6

1 2 3 4 5

AK604297

1

2

3 4 5 6 7 8 9 10 11 12 13 14 15 16

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

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

AD

LIGHT GREEN

BLUE-WHITE

B-11

(MU805200)

15

1

16

2

B-09

ENGINE
CONTROL
MODULE

THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT

THROTTLE
ACTUATOR
CONTROL
MOTOR

AK704227

Connector: B-09

ECM

B-09 (GR)

AB

AK704247AB

Connector: B-11

B-11 (B)

Radiator cap

Throttle body assembly
(incorporating throttle
position sensor)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-635

DESCRIPTIONS OF MONITOR METHODS

Throttle actuator control motor intelligent power 
device detects shorted-high/low and overheat of 
itself.

.

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)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.

DTC SET CONDITIONS

Check Condition

• Battery positive voltage is higher than 8.3 volts.

Judgement Criterion

• The coil current of the throttle actuator control 

motor is 8 ampere or more for 0.3 second.

.

FAIL-SAFE AND BACKUP FUNCTION

• Throttle opening degree position is in default 

position.

.

OBD-II DRIVE CYCLE PATTERN

None.

.

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

• Throttle actuator control motor failed.
• Shorted throttle actuator control motor circuit, 

harness 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

STEP 1. Check harness connector B-11 at throttle actuator 
control motor 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 7.

STEP 2. Check the throttle actuator control motor.
(1) Disconnect the connector B-11.
(2) Measure the resistance between throttle actuator control 

motor side connector terminal No. 1 and No. 2.

Standard value: 0.3 − 80 Ω [at 20° C (68° F)]

Q: Is the measured resistance between 0.3 and 80 Ω [at 

20° C (68° F)]?
YES : Go to Step 3.
NO :  Replace the throttle body assembly. Then go to Step 

7.

6

1 2 3 4 5

AK604495AB

Throttle actuator control 
motor connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-636

STEP 3. Check harness connector B-09 at ECM for damage
Q: Is the harness connector in good condition?

YES : Go to Step 4.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 7.

STEP 4. Check for short circuit to ground between throttle 
actuator control motor connector B-11 (terminal No. 1) and 
ECM connector B-09 (terminal No. 15).
Q: Is the harness wire in good condition?

YES : Go to Step 5.
NO :  Repair it. Then go to Step 7.

STEP 5. Check for short circuit to ground between throttle 
actuator control motor connector B-11 (terminal No. 2) and 
ECM connector B-09 (terminal No. 16).
Q: Is the harness wire in good condition?

YES : Go to Step 6.
NO :  Repair it. Then go to Step 7.

STEP 6. 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 P2101 set?

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

register the ID code. Refer to GROUP 42B, ID Code 
Registration Necessity Judgment Table <Vehicles 
with KOS> 

P.42B-11

 or GROUP 42C, ID Codes 

Registration Judgment Table <Vehicles with WCM> 

P.42C-9

. Then go to Step 7.

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

.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB