Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual - part 214

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-55

STEP 9. Check for open circuit between barometric
pressure sensor connector B-14 terminal 5 and ECM
connector C-58 terminal 49 <M/T> or PCM connector C-55
terminal 57 <A/T>.
Q: Is the harness wire in good condition?

YES : Replace the ECM or PCM. Then go to Step 12.
NO : Repair it. Then go to Step 12.

STEP 10. Check connector B-14 at barometric pressure
sensor for damage.
Q: Is the connector in good condition?

YES : Go to Step 11.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 12.

STEP 11. Check connector C-58 at ECM <M/T> or
connector C-55 at PCM <A/T> for damage.
Q: Is the connector in good condition?

YES : Replace the volume air flow sensor. Then go to Step

12.

NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 12.

ACX02480

CONNECTOR : B-14

BAROMETRIC
PRESSURE
SENSOR

AK000225

CONNECTOR : C-58<M/T>, C-55<A/T>

C-55

C-58

PCM<A/T>

ECM<M/T>

ACX02480

CONNECTOR : B-14

BAROMETRIC
PRESSURE
SENSOR

AK000225

CONNECTOR : C-58<M/T>, C-55<A/T>

C-55

C-58

PCM<A/T>

ECM<M/T>

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-56

STEP 12. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to

P.13B-4

, Procedure 6

−

Other Monitor.

(2) Check the diagnostic trouble code (DTC).

Q: Is the DTC P0108 is output?

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

DTC P0111: Intake air temperature Circuit Range/Performance Problem

AK000687

2 3

4 5 6

BLA

RED-BLUE

49<M/T>
57<A/T>

62<M/T>
64<A/T>

B-14

INTAKE AIR TEMPERATURE SENSOR
(INCORPORATED IN VOLUME AIR
FLOW SENSOR)

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

43
50

42
49

41
48
60 61

46 47
58 59
67 68

56
66

C-58<M/T>
(MU803782)

C-55<A/T>
(MU803781)

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

58 59

60 61 62 63

64 65 66

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-57

CIRCUIT OPERATION

•

Approximately 5 volts are applied to the intake air
temperature sensor output terminal (terminal 6)
from the ECM (terminal 62) <M/T> or PCM
(terminal 64) <A/T> via the resistor in the ECM
<M/T> or PCM <A/T>. The ground terminal
(terminal 5) is grounded with ECM (terminal 49)
<M/T> or PCM (terminal 57) <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.

DTC SET CONDITIONS

Check Conditions

•

Two seconds or more have passed since the
engine was started.

Judgement Criteria

•

Intake air temperature sensor output voltage has
continued to be 4.6 volts or higher [corresponding
to an air intake temperature of -45

C (-49

F) or

lower] for 2 seconds.

•

Intake air temperature sensor output voltage has
continued to be 0.2 volt or lower [corresponding
to an air intake temperature of 125

C (257

F) or

higher] for 2 seconds.

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.

•

ECM failed. <M/T>

•

PCM failed. <A/T>

DIAGNOSIS

Required Special Tools
MB991502: Scan Tool (MUT-II)

ACX02480

CONNECTOR : B-14

INTAKE AIR
TEMPERATURE
SENSOR

AK000225

CONNECTOR : C-58<M/T>, C-55<A/T>

C-55

C-58

PCM<A/T>

ECM<M/T>

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-58

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
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991502 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 the sensor output voltage at intake air
temperature sensor connector B-14 by backprobing.
(1) Do not disconnect the connector B-14.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 6 and ground by

backprobing.

•

When intake air temperature is 0

C (32

F), voltage

should be 3.2 and 3.8 volts.

•

When intake air temperature is 20

C (68

F), voltage

should be 2.3 and 2.9 volts.

•

When intake air temperature is 40

C (104

F), voltage

should be 1.5 and 2.1 volts.

•

When intake air temperature is 80

C (176

F), voltage

should be 0.4 and 1.0 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the voltage normal?

YES : Go to Step 3.
NO : Go to Step 5.

STEP 3. Check connector B-14 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 19.

AKX01177

16 PIN

MB991502

AKX01524

B-14 CONNECTOR
HARNESS
SIDE VIEW

1 2 3 4 5 6 7

ACX02480

CONNECTOR : B-14

INTAKE AIR
TEMPERATURE
SENSOR

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