Mitsubishi Montero (2004+). Manual - part 325

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-787

STEP 2. Check for short circuit to ground between throttle 
position sensor connector B-05 (terminal No. 1) and PCM 
connector D-135 (terminal No. 115).
Q: Is the harness wire in good condition?

YES : Go to Step 3.
NO :  Repair it. Then go to Step 5.

AK201174

1

6 5 4 3 2

B-05(B)

CONNECTOR: B-05

HARNESS 
CONNECTOR: 
COMPONENT SIDE

AB

AK200947

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

CONNECTOR: D-135

HARNESS CONNECTOR: 
COMPONENT SIDE

AB

PCM

D-135(GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-788

STEP 3. Check for short circuit to ground between throttle 
position sensor connector B-05 (terminal No. 3) and PCM 
connector D-135 (terminal No. 113).
Q: Is the harness wire in good condition?

YES : Go to Step 4.
NO :  Repair it. Then go to Step 5.

STEP 4. Replace the throttle body assembly.
(1) Replace the throttle body assembly.
(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 P2135 set?

YES : Replace the PCM. Then go to Step 5.
NO :  The procedure is complete.

AK201174

1

6 5 4 3 2

B-05(B)

CONNECTOR: B-05

HARNESS 
CONNECTOR: 
COMPONENT SIDE

AB

AK200947

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

CONNECTOR: D-135

HARNESS CONNECTOR: 
COMPONENT SIDE

AB

PCM

D-135(GR)

AK201174

1

6 5 4 3 2

B-05(B)

CONNECTOR: B-05

HARNESS 
CONNECTOR: 
COMPONENT SIDE

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-789

STEP 5. 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 P2135 set?

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

DTC P2138: Accelerator Pedal Position Sensor (Main and Sub) Circuit Range/Performance Problem

.

Accelerator Pedal Position Sensor (Main and 
Sub) Range/Performance Problem Circuit

• Refer to DTC P2122 − Accelerator Pedal Position 

Sensor (Main) Circuit 

P.13A-743

.

• Refer to DTC P2127 − Accelerator Pedal Position 

Sensor (Sub) Circuit 

P.13A-768

.

.

CIRCUIT OPERATION

• Refer to DTC P2122 − Accelerator Pedal Position 

Sensor (Main) Circuit 

P.13A-743

.

• Refer to DTC P2127 − Accelerator Pedal Position 

Sensor (Sub) Circuit 

P.13A-768

.

.

TECHNICAL DESCRIPTION

• PCM checks the APS output signal characteris-

tics for abnormal conditions.

.

DESCRIPTIONS OF MONITOR METHODS
Detect malfunction if the relation between accelera-

tor pedal position sensor (main) and accelerator 
pedal position sensor (sub) is wrong.

.

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

.

AK302970

AB

MB991911

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-790

DTC SET CONDITIONS <Range/Performance problem 

− relation between main and sub>

Logic Flow Chart

.

Check Condition

• Ignition switch "ON" position.

• Accelerator pedal position sensor (main) output 

voltage is between 0.2 and 4.5 volts.

• Accelerator pedal position sensor (sub) output 

voltage is between 0.2 and 4.5 volts.

• Change of accelerator pedal position sensor 

(sub) output voltage per 25 miliseconds is lower 
than 0.06 volt.

Judgement Criteria

• Voltage obtained with the formula given below is 

1.0 volt or higher for 1 second: [accelerator pedal 
position sensor (sub) output voltage +0.3 volt] 

− 

accelerator pedal position sensor (main) output 
voltage.

.

START

END

NO

NO

YES

YES

YES

NO

MALFUNCTION

GOOD

CONTINUOUS

FAILURE FOR 1sec

{APS (SUB) +0.3V} -

APS (MAIN)

> =1.0V

MONITORING

CONDITIONS

AK302966