Mitsubishi Eclipse. Manual — part 394
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-119
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
.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-120
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 4.5 volts or higher [corresponding
to an air intake temperature of
−40°C (−104°F) or
lower] for 2 seconds.
.
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 intake air temperature sensor circuit con-
nector 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-121
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 or 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
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
. Then go to Step 11.
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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-122
STEP 3. 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 kΩ)
Q: Is the measured resistance between 0.30 and 1.0 k
Ω?
YES : Go to Step 4.
NO : Replace the volume airflow sensor. Then go to Step
11.
STEP 4. 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 measured voltage between 4.5 and 4.9 volts?
YES : Go to Step 8.
NO : Go to Step 5.
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
AK300078
3
4
5
1
2
6
7
CONNECTOR: B-14
AB
B-14 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
AKX01408
7 6 5 4 3 2 1
AG
B-14 HARNESS
CONNECTOR:
COMPONENT SIDE
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