Mitsubishi Montero (2002-2004). Manual — part 589

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-53

STEP 5. Check connector D-135 at PCM for damage.
Q: Is the 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. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to

GROUP 13A, Procedure 6

− Other Monitor

P.13Ab-2

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0112 set?

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

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

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117

118

119

120

CONNECTOR: D-135

HARNESS CONNECTOR:
COMPONENT SIDE

AB

PCM

D-135(GR)

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-54

DTC P0113: Intake air temperature Circuit High Input

.

CIRCUIT OPERATION

• Approximately 5 volts are applied to the intake air

temperature sensor output terminal (terminal No.
6) from the PCM (terminal No. 99) via the resistor
in the PCM. The ground terminal (terminal No. 5)
is grounded with PCM (terminal No. 88).

• The intake air temperature sensor is a negative

temperature coefficient type of resistor. When the
intake air temperature rises, the resistance
decreases.

• The intake air temperature sensor output voltage

increases when the resistance increases and
decreases when the resistance decreases.

.

SKY B

ULE

AK201128

RED-BLUE

INTAKE AIR TEMPERATURE SENSOR
(INCORPORATED IN VOLUME AIRFLOW
SENSOR)

POWERTRAIN CONTROL MODULE (PCM)

5 V

99

5

88

6

1 2 3 4 5 6 7

B-48

Intake Air Temperature Sensor Circuit

9192

939495

96979899

100

105

113114

115116117

118119120

106

107108109

110111112

101102103

104

D-135

(MU803805)

61
656667686970 717273
74757677787980 8182
8384

858687

8889

62

6364

D-134

(MU803804)

AK200940AC

CONNECTOR: B-48

INTAKE AIR
TEMPERATURE
SENSOR

B-48(B)

AK201038AK

CONNECTORS: D-134, D-135

PCM

D-134(GR) D-135(GR)

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-55

TECHNICAL DESCRIPTION

• The intake air temperature sensor converts the

intake air temperature to a voltage.

• The PCM checks whether this voltage is within a

specified range.

.

DTC SET CONDITIONS

Check Conditions

• 2 seconds or more have passed since the start-

ing sequence was completed.

Judgement Criteria

• Intake air temperature sensor output voltage has

continued to be 4.6 volts or higher [corresponding
to an air intake temperature of

−40°C (−40°F) or

lower] for 2 seconds.

.

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

• Intake air temperature sensor failed.

• Open or shorted intake air temperature sensor

circuit, or loose connector.

• PCM failed.

DIAGNOSIS

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, check data list item 13:
Intake Air Temperature Sensor.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991502 to the data reading mode for item

13, Intake Air Temperature Sensor.

• The intake air temperature and temperature shown with

the scan tool should approximately match.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?

YES : It can be assumed that this malfunction is intermittent.

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

P.00-6

.

NO : Go to Step 2.

STEP 2. Check connector B-48 at the intake air
temperature sensor for damage.
Q: Is the connector in good condition?

YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 11.

ACX01539

16-PIN

MB991502

AC

AK200937

3

4

5

1

2

6

7

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

CONNECTOR: B-48

B-48(B)

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-56

STEP 3. Check the intake air temperature sensor.
(1) Disconnect the intake air temperature sensor connector B-

48.

(2) Measure the resistance between intake air temperature

sensor side connector terminal No. 5 and No. 6.

• There should be continuity. (0.30 − 1.0 kiloohm)

Q: Is the measured resistance between 0.30 and 1.0 ohms?

YES : Go to Step 4.
NO : Replace the volume airflow sensor. Then go to Step

11.

STEP 4. Check the sensor supply voltage at intake air
temperature sensor harness side connector B-48.
(1) Disconnect the connector B-48 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 6 and ground.

• Voltage should be between 4.5 and 4.9 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.5 and 4.9 volts?

YES : Go to Step 8.
NO : Go to Step 5.

AK200937

3

4

5

1

2

6

7

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

CONNECTOR: B-48

B-48(B)

AK000319AB

1 2 3 4 5 6 7

INTAKE AIR TEMPERATURE
SENSOR SIDE CONNECTOR

AK200937

3

4

5

1

2

6

7

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

CONNECTOR: B-48

B-48(B)

AKX01408AJ

B-48 HARNESS CONNECTOR:
COMPONENT SIDE

1

2

3

4

5

6

7