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
NO : Go to Step 2.
AK200937
3
4
5
1
2
6
7
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
13Ac-46
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
. Then go to Step 9.
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
AKX01621 AB
INTAKE AIR
TEMPERATURE
SENSOR
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-47
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
. Then go to Step 9.
AK200937
3
4
5
1
2
6
7
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
AK201166
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71
76
77
78
79
85
86
87
80
72
73
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75
81
82
83
84
88
89
CONNECTOR: D-134
AB
PCM
D-134(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-48
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
. Then go to Step 9.
AK200937
3
4
5
1
2
6
7
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-48
B-48(B)
AK201166
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85
86
87
80
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81
82
83
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88
89
CONNECTOR: D-134
AB
PCM
D-134(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AK201166
61
62
63
64
65
66
67
68
69
70
71
76
77
78
79
85
86
87
80
72
73
74
75
81
82
83
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88
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CONNECTOR: D-134
AB
PCM
D-134(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
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