Mitsubishi Montero (2004+). Manual — part 152

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-95

DTC P0111: Intake Air Temperature Circuit Range/Performance Problem

.

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-96

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 does

not change when specified go/stop operations
are repeated.

.

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

.

DISC SET CONDITIONS

Logic Flow Chart

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 (1

mph) lasting more than 30 seconds.

END

YES

NO

NO

NO

START

MONITORING

CONDITION

YES

MALFUNCTION

GOOD

F1: COUNTER OF A DRIVING STATE.
F2: COUNTER OF A STOP STATE.

INTAKE AIR TEMP.

CHANGES

GO/STOP OPERATION

FOR SPECIFIED TIMES

YES

AK302921

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-97

Judgement Criteria

• Changes in the intake air temperature is lower

than 1

°C (1.8°F).

.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function

− OBD-II Drive Cycle −

Procedure 6

− Other Monitor

P.13A-4

.

.

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) Remove the air intake hose from the volume airflow sensor.
(3) Turn the ignition switch to the "ON" position.
(4) Set scan tool MB991958 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

3

4

5

1

2

6

7

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

CONNECTOR: B-48

B-48(B)

AKX01621 AB

INTAKE AIR
TEMPERATURE
SENSOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-98

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 kΩ [at −20°C (−4°F)]

5.3

− 6.7 kΩ [at 0°C (32°F)]

2.3

− 3.0 kΩ [at 20°C (68°F)]

1.0

− 1.5 kΩ [at 40°C (104°F)]

0.56

− 0.76 kΩ [at 60°C (140°F)]

0.30

− 0.42 kΩ [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

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)