Mitsubishi Eclipse. Manual — part 392

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-111

STEP 9. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to

Diagnostic Function

− OBD-II Drive Cycle − Procedure 6 −

Other Monitor

P.13B-7

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0111 set?

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

DTC P0112: Intake air temperature Circuit Low Input

AK300838

2 3

7

4 5 6

1

BR

O

W

N

RED-BLUE

34 <M/T>*1
16 <A/T>*3

62 <M/T>*2
64 <A/T>*4

B-14

INTAKE AIR TEMPERATURE SENSOR
(INCORPORATED IN VOLUME
AIRFLOW SENSOR)

ENGINE CONTROL MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL MODULE (PCM) <A/T>

5

6

5 V

65

43
50

42
49

41
48
60 61

64

46 47
58 59
67 68

45

56
66

52

51

44

53

62

54

63

57

55

C-58 <M/T>
(MU803782)

C-55 <A/T>
(MU803781)

42 43
48 49 50 51 52 53 54 55 56 57

46

45

44

58 59

60 61 62 63

64 65 66

47

41

Intake Air Temperature Sensor Circuit

C-51 <M/T>, C-52 <A/T>
(MU803784)

2

3 4

5 6

7 8

9

11 12 13 14 15 16 17 18 19 20

30

21 22 23

24 25

26 27 28 29

3132 33

34 35

1

10

NOTE
*1: ECM connector C-51 <M/T>
*2: ECM connector C-58 <M/T>
*3: PCM connector C-52 <A/T>
*4: PCM connector C-55 <A/T>

AK300053

CONNECTOR: B-14

AD

B-14 (B)

INTAKE AIR
TEMPERATURE
SENSOR

AK300091

CONNECTORS: C-51, C-58 <M/T>

ECM

AB

C-51 (GR)

C-58 (GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-112

.

CIRCUIT OPERATION

• Approximately 5 volts are applied to the intake air

temperature sensor output terminal (terminal No.
6) from the ECM (terminal No. 62) <M/T> or PCM
(terminal No. 64) <A/T> via the resistor in the
ECM <M/T> or PCM <A/T>. The ground terminal
(terminal No. 5) is grounded with ECM (terminal
No. 34) <M/T> or PCM (terminal No. 16) <A/T>.

• 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.

.

TECHNICAL DESCRIPTION

• The intake air temperature sensor converts the

intake air temperature to a voltage.

• The ECM <M/T> or PCM <A/T> 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

.

AK300244

CONNECTORS: C-52, C-55 <A/T>

AB

PCM

C-52 (GR)

C-55 (GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-113

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 0.2 volt or lower [corresponding
to an air intake temperature of 115

°C (239°F) or

higher] for 2 seconds.

.

OBD-ll DRIVE CYCLE PATTERN
Refer to , Diagnostic Function

− OBD-ll Drive Cycle −

Procedure 6

− Other Monitor

P.13B-7

.

.

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.

• ECM failed. <M/T>

• PCM failed. <A/T>

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

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

AK301424

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-114

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

P.00-6

.

NO : Go to Step 2.

STEP 2. Check connector B-14 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 6.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824

AK300078

3

4

5

1

2

6

7

CONNECTOR: B-14

AB

B-14 (B)

HARNESS
CONNECTOR:
COMPONENT SIDE