Mitsubishi Montero (2004+). Manual — part 155
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-107
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
U
LE
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)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-108
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.
.
DESCRIPTIONS OF MONITOR METHODS
Intake air temperature sensor output voltage is out of
specified range.
.
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
Logic Flow Chart
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.
.
START
OUTPUT VOLTAGE < 0.2V
END
NO
NO
NO
YES
YES
YES
MALFUNCTION
GOOD
CONTINUOUS
FAILURE FOR 2secs
OUTPUT VOLTAGE > 4.6V
MONITORING
CONDITIONS
NO
YES
AK302922
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-109
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Procedure 6
− Other Monitor
.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Intake air temperature sensor failed.
• Open intake air temperature sensor circuit, har-
ness damage, or connector damage.
• PCM failed.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
STEP 1. Using scan tool MB991958, check data list item 13:
Intake Air Temperature Sensor.
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) Set scan tool MB991958 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
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
. Then go to Step 11.
AK302970
AB
MB991911
MB991824
MB991827
AK200937
3
4
5
1
2
6
7
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-48
B-48(B)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-110
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 − 20 kΩ)
Q: Is the measured resistance between 0.30 and 20 k
Ω?
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
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