Mitsubishi Montero (2004+). Manual — part 300

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-687

DTC P0657: Throttle Actuator Control Motor Relay Circuit Malfunction

AK302420

Throttle Actuator Control Motor Relay Circuit

THROTTLE
ACTUATOR
CONTROL
MOTOR
RELAY

THROTTLE ACTUATOR
CONTROL MOTOR
POWER SURCE

B-22X

B-23X

A-03

(MU802611)

WHITE-BLA

CK

WHITE-

BLA

CK

WHITE-

BLA

C

K

WHITE-
BLACK

WHITE-

BLA

CK

SKY BLUE

To PCM

To PCM

MFI
RELAY

RED

RED

RED

FUSIBLE LINK(5)

2

3

6

4

1

4

3

2

1

15

132

D-136

D-132

1 2 3 4 5 6
7 8 9 10 11 12

1

2

3

4

1

2

3

4

POWERTRAIN CONTROL MODULE

1

2

3

5

6 7 8 9

4

20

21 22

232425

2627

10111213

14 15

16 1718

19

D-132

(MU803802)

D-136

(MU803801)

121122

123

125126127128129 130 131 132

134135

136 137 138 139 140

142143

144

145

124

133

141

146

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-688

.

CIRCUIT OPERATION

• Battery positive voltage is applied to the throttle

actuator control motor relay terminal (terminal
No. 3).

• Battery positive voltage is applied to the throttle

actuator control motor relay terminal (terminal
No. 4) from the MFI relay (terminal No. 1).

• PCM (terminal No. 15) applies current to the

throttle actuator control motor relay coil by turning
ON the power transistor in the unit in order to
turn the relay ON.

• When the throttle actuator control motor relay

turns ON, battery positive voltage is supplied by
the throttle actuator control motor relay (terminal
No. 1) to the PCM (terminal No. 132).

.

TECHNICAL DESCRIPTION

• When the ignition switch ON signal is input into

the PCM, the PCM turns ON the throttle actuator
control motor relay.

.

DESCRIPTIONS OF MONITOR METHODS
Throttle actuator control motor relay circuit voltage 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

• Ignition switch "ON" position.

Judgement Criteria

• The power line voltage of the electronic controlled

throttle system should be 4.0 volts or less for 1
second.

.

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

• Throttle actuator control motor relay failed or mal-

adjusted.

• Open or shorted throttle actuator control motor

relay circuit, harness damage, or connector dam-
age.

• PCM failed.

AK201046

A-03(B)

AB

CONNECTOR: A-03

AK201171

B-23X

AB

CONNECTOR: B-23X

THROTTLE ACTUATOR
CONTROL MOTOR
RELAY

AK201039

MFI RELAY

B-22X

AB

CONNECTOR: B-22X

AK201565

CONNECTORS: D-132, D-136

AB

PCM

D-132(GR) D-136(GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-689

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

STEP 1. Check connector B-23X at throttle actuator control
motor relay for damage.
Q: Is the 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 14.

AK201172

2 1

3

4

B-23X

AB

CONNECTOR: B-23X

HARNESS
CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-690

STEP 2. Check the throttle actuator control motor relay.
(1) Remove the throttle actuator control motor relay.

(2) Check for continuity between the throttle actuator control

motor relay terminal No. 2 and No. 4.

• There should be continuity (approximately 70 ohms).

(3) Use jumper wires to connect throttle actuator control motor

relay terminal No. 4 to the positive battery terminal and
terminal No. 2 to the negative battery terminal.

(4) Check the continuity between the throttle actuator control

motor relay terminal No. 1 and No. 3 while connecting and
disconnecting the jumper wire at the negative battery
terminal.

• Should be less than 2 ohms. (Negative battery terminal

connected.)

• Should be open loop. (Negative battery terminal discon-

nected.)

(5) Install the throttle actuator control motor relay.
Q: Is the resistance normal?

YES : Go to Step 3.
NO : Replace the throttle actuator control motor relay.

Then go to Step 14.

AK201172

2 1

3

4

B-23X

AB

CONNECTOR: B-23X

HARNESS
CONNECTOR:
COMPONENT SIDE

1

2

3

4

AK201380AC

THROTTLE ACTUATOR
CONTROL MOTOR RELAY
SIDE CONNECTOR

1

2

3

4

AK201381

THROTTLE ACTUATOR
CONTROL MOTOR RELAY
SIDE CONNECTOR

AC