Mitsubishi Montero (2002-2004). Manual - part 587

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-45

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

• Engine coolant temperature is higher than 76°C 

(169

°F).

• Repeat 5 or more times: drive

*1

, stop

*2

.

Drive

*1

: vehicle speed higher than 50 km/h (31 

mph) lasting a total of more than 60 seconds.

Stop

*2

: vehicle speed lower than 1.5 km/h (0.9 

mph) lasting more than 30 seconds.

Judgement Criteria

• Changes in the intake air temperature is lower 

than 1

°C (1.8°F).

.

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) Remove the air intake hose from the volume airflow sensor.
(3) Turn the ignition switch to the "ON" position.
(4) Set scan tool MB991502 to the data reading mode for item 

13, Intake Air Temperature Sensor.

(5) Heating the sensor using a hair drier.

• The indicated temperature increases.

NOTE: Do not allow it to increase over 80

°

C (176

°

F).

(6) Turn the ignition switch to the "LOCK" (OFF) position.
(7) Attach the air intake hose.
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.

AK200937

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AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

CONNECTOR: B-48

B-48(B)

AKX01621 AB

INTAKE AIR
TEMPERATURE
SENSOR

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DIAGNOSTIC TROUBLE CODE PROCEDURES

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STEP 2. 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.

(3) Measure resistance while heating the sensor using a hair 

drier.

Standard value:

13 

− 17 kiloohms [at −20°C (−4°F)]

5.3 

− 6.7 kiloohms [at 0°C (32°F)]

2.3 

− 3.0 kiloohms [at 20°C (68°F)]

1.0 

− 1.5 kiloohms [at 40°C (104°F)]

0.56 

− 0.76 kiloohm [at 60°C (140°F)]

0.30 

− 0.42 kiloohm [at 80°C (176°F)]

Q: Is the resistance at the standard value?

YES : Go to Step 3.
NO :  Replace the volume airflow sensor. Then go to Step 9.

STEP 3. Check connector B-48 at the intake air 
temperature sensor for damage.
Q: Is the 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 9.

AK200937

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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

AKX01621 AB

INTAKE AIR
TEMPERATURE
SENSOR

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HARNESS 
CONNECTOR: 
COMPONENT SIDE

CONNECTOR: B-48

B-48(B)

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DIAGNOSTIC TROUBLE CODE PROCEDURES

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

side.

(2) Check for the continuity between terminal No. 5 and 

ground.

• Should be less than 2 ohms.

Q: Is the continuity normal?

YES : Go to Step 7.
NO :  Go to Step 5.

STEP 5. Check connector D-134 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 6.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 9.

AK200937

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AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

CONNECTOR: B-48

B-48(B)

AKX01409

1

2

3

4

5

6

7

B-48 HARNESS CONNECTOR: 
COMPONENT SIDE

AL

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CONNECTOR: D-134

AB

PCM

D-134(GR)

HARNESS CONNECTOR: 
COMPONENT SIDE

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DIAGNOSTIC TROUBLE CODE PROCEDURES

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STEP 6. Check for open circuit and harness damage 
between intake air temperature sensor connector B-48 
(terminal No. 5) and PCM connector D-134 (terminal No. 
88).
Q: Is the harness wire in good condition?

YES : Replace the PCM. Then go to Step 9.
NO :  Repair it. Then go to Step 9.

STEP 7. Check connector D-134 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 8.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 9.

AK200937

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1

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AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

CONNECTOR: B-48

B-48(B)

AK201166

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CONNECTOR: D-134

AB

PCM

D-134(GR)

HARNESS CONNECTOR: 
COMPONENT SIDE

AK201166

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CONNECTOR: D-134

AB

PCM

D-134(GR)

HARNESS CONNECTOR: 
COMPONENT SIDE