Mitsubishi Montero (2004+). Manual - part 306

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-711

STEP 3. Measure the backup power supply voltage at PCM 
harness side connector D-133.
(1) Disconnect the PCM connector D-133 and measure at the 

harness side.

(2) Measure the voltage between terminal No. 58 and ground.

• Voltage should be battery positive voltage.

Q: Is battery positive voltage (approximately 12 volts) 

present?
YES : Go to Step 4.
NO :  Check connector A-03 at intermediate connector for 

damage, and repair or replace as required. Refer to 
GROUP 00E, Harness Connector Inspection 

P.00E-2

. If intermediate connector is in good 

condition, repair harness wire between fusible link (5) 
and PCM connector D-133 (terminal No. 58) because 
of open circuit or short circuit to ground. Then go to 
Step 6.

STEP 4. Check connector D-133 at PCM for damage.
Q: Is the harness connector in good condition?

YES : Check connector A-03 at intermediate connector for 

damage, and repair or replace as required. Refer to 
GROUP 00E, Harness Connector Inspection 

P.00E-2

. If intermediate connector is in good 

condition, repair harness wire between battery and 
PCM connector D-133 (terminal No. 58) because of 
harness damage. Then go to Step 6.

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

Connector Inspection 

P.00E-2

. Then go to Step 6.

AK200939

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AB

CONNECTOR: D-133

HARNESS CONNECTOR: 
COMPONENT SIDE

PCM

D-133(GR)

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D-133 HARNESS 
CONNECTOR: 
COMPONENT SIDE

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AB

CONNECTOR: D-133

HARNESS CONNECTOR: 
COMPONENT SIDE

PCM

D-133(GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-712

STEP 5. Check connector D-133 at PCM for damage.
Q: Is the harness connector in good condition?

YES : Replace the PCM. Then go to Step 6.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 6.

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) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P1603 set?

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

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CONNECTOR: D-133

HARNESS CONNECTOR: 
COMPONENT SIDE

PCM

D-133(GR)

AK302970

AB

MB991911

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-713

DTC P2100: Throttle Actuator Control Motor Circuit (Open)

AK201406

GREEN-

WHITE

GREEN-

YELL

OW

B-05

133

8

6

THROTTLE
ACTUATOR
CONTROL
MOTOR

POWERTRAIN
CONTROL
MODULE

GROUND
JOINT
CONNECTOR

141

144

145

5

6

1 2 3 4 5

D-14

(MU801335)

BL

ACK

BL

ACK

BL

ACK

GND

GND

1

2 3

6

7 8

4 5

9 10

D-136

(MU803801)

121122

123

125126127128129 130 131 132

134135

136 137 138 139 140

142143

144

145

124

133

141

146

AK201173AC

THROTTLE 
ACTUATOR 
CONTROL 
MOTOR 

AK201049

D-14

AB

CONNECTOR: D-14

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-714

.

CIRCUIT OPERATION

• Controls the current that is applied from the PCM 

(terminals No. 133, No. 141) to the throttle actua-
tor control motor (terminals No. 5, No. 6).

.

TECHNICAL DESCRIPTION

• PCM varies the direction and the amperage of 

the current that is applied to the throttle actuator 
control motor in order to control the opening of 
the throttle valve.

.

DESCRIPTIONS OF MONITOR METHODS
Motor circuit current is smaller than the specified 

value.

.

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 Criteria

• Throttle actuator control motor current should be 

0.1 amperes or less for 0.72 second.

.

OBD-II DRIVE CYCLE PATTERN
None.

.

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

• Throttle actuator control motor failed.

• Open throttle actuator control motor circuit, or 

harness damage, or connector damage.

• PCM failed.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

AK201038AI

CONNECTOR: D-136

PCM

D-136(GR)