Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 215

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-59

STEP 4. 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 : Replace the ECM or PCM. Then go to Step 19.

STEP 5. Check connector B-14 at intake air temperature
sensor 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 (

P.00E-2

). Then go to Step 19.

AKX01177

16 PIN

MB991502

AB

ACX02480

CONNECTOR : B-14

AG

INTAKE AIR
TEMPERATURE
SENSOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-60

STEP 6. Check the intake air temperature sensor.
(1) Disconnect the intake air temperature sensor connector B-

14

(2) Measure the resistance between intake air temperature

sensor side connector terminal 5 and 6.

•

There should be continuity. (0.30

−

1.0 k

Ω

)

NOTE: Check that the circuit is not open loop.

Q: Is the resistance normal?

YES : Go to Step 7.
NO : Replace the volume air flow sensor. Then go to Step

19.

STEP 7. Check the sensor supply voltage at intake air
temperature sensor harness side connector B-14.
(1) Disconnect the connector B-14 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 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 voltage normal?

YES : Go to Step 12.
NO : Go to Step 8.

ACX02480

CONNECTOR : B-14

AG

INTAKE AIR
TEMPERATURE
SENSOR

AKX01407AB

INTAKE AIR TEMPERATURE
SENSOR SIDE CONNECTOR

1 2 3 4 5 6 7

AKX01408

B-14 HARNESS
SIDE CONNECTOR

7 6 5 4 3 2 1

AC

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-61

STEP 8. Check the sensor supply voltage at ECM
connector C-58 <M/T> or PCM connector C-55 <A/T> by
backprobing.
(1) Do not disconnect the ECM connector C-58 <M/T> or PCM

connector C-55 <A/T>.

(2) Disconnect the intake air temperature sensor connector B-

14.

(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between terminal 62 <M/T> or 64 <A/

T> and ground by backprobing.

•

Voltage should be between 4.5 and 4.9 volts.

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

Q: Is the voltage normal?

YES : Go to Step 9.
NO : Go to Step 10.

STEP 9. 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 : Repair harness wire between intake air temperature

sensor connector B-14 terminal 6 and ECM connector
C-58 terminal 62 <M/T> or PCM connector C-55
terminal 64 <A/T> because of open circuit. Then go to
Step 19.

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

Connector Inspection (

P.00E-2

). Then go to Step 19.

STEP 10. 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 : Go to Step 11.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 19.

AK000231

41424344
48

50 51

49

52 5354555657 58 59

45 46 47

60 61

626364

65

67 68

66

AK000231AC

<M/T>

C-58 CONNECTOR
HARNESS SIDE VIEW

AKX01525

AKX01525 AE

41 42 43

44 45 46

47 48 49 50 51 52 53 54 55 56 57
58 59

60 61 62 63

64 65 66

<A/T>

C-55 CONNECTOR
HARNESS
SIDE VIEW

AK000225

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

C-55

C-58

PCM<A/T>

ECM<M/T>

AI

AK000225

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

C-55

C-58

PCM<A/T>

ECM<M/T>

AI

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-62

STEP 11. Check for short circuit to ground between intake
air temperature sensor connector B-14 terminal 6 and ECM
connector C-58 terminal 62 <M/T> or PCM connector C-55
terminal 64 <A/T>.
Q: Is the harness wire in good condition?

YES : Replace the ECM or PCM. Then go to Step 19.
NO : Repair it. Then go to Step 19.

STEP 12. Check the continuity at intake air temperature
sensor harness side connector B-14.
(1) Disconnect the connector B-14 and measure at the harness

side.

(2) Check for the continuity between terminal 5 and ground.

•

Should be less than 2 ohm.

Q: Is the continuity normal?

YES : Go to Step 15.
NO : Go to Step 13.

STEP 13. 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 : Go to Step 14.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 19.

ACX02480

CONNECTOR : B-14

AG

INTAKE AIR
TEMPERATURE
SENSOR

AK000225

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

C-55

C-58

PCM<A/T>

ECM<M/T>

AI

AKX01409AC

B-14 HARNESS
SIDE CONNECTOR

7 6 5 4 3 2 1

AK000225

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

C-55

C-58

PCM<A/T>

ECM<M/T>

AI