Mitsubishi Eclipse. Manual — part 390
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-103
DTC 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 (1.0
mph) lasting more than 30 seconds.
Judgement Criteria
• Changes in the intake air temperature is lower
than 1
°C (1.8°F).
.
OBD-ll DRIVE CYCLE PATTERN
Refer to , Diagnostic Function
− OBD-ll Drive Cycle −
Procedure 6
.
.
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:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
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
AK301423
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-104
• 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
NO : Go to Step 2.
AK300810
AB
MB991911
16-PIN
MB991827
MB991824
ACX02480
CONNECTOR : B-14
AG
INTAKE AIR
TEMPERATURE
SENSOR
AKX01621 AB
INTAKE AIR
TEMPERATURE
SENSOR
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-105
STEP 2. 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 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-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
. Then go to Step 9.
AK300078
3
4
5
1
2
6
7
CONNECTOR: B-14
AB
B-14 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
AK000319AB
1 2 3 4 5 6 7
INTAKE AIR TEMPERATURE
SENSOR SIDE CONNECTOR
AKX01621 AB
INTAKE AIR
TEMPERATURE
SENSOR
AK300078
3
4
5
1
2
6
7
CONNECTOR: B-14
AB
B-14 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-106
STEP 4. 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 No. 5 and
ground.
• Should be less than 2 ohms.
Q: Is the continuity normal?
YES : Go to Step 7.
NO : Go to Step 5.
AK300078
3
4
5
1
2
6
7
CONNECTOR: B-14
AB
B-14 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
AKX01409AI
7 6 5 4 3 2 1
B-14 HARNESS
CONNECTOR:
COMPONENT SIDE
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