Mitsubishi Lancer Evolution X. Manual — part 276
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-169
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Engine coolant temperature is higher than 76° C
(169° F).
• Repeat 2 or more times: drive
*1
, stop
*2
.
Drive
*1
: vehicle speed higher than 50 km/h (31
mph) lasting a total of 60 seconds or more.
Stop
*2
: vehicle speed lower than 1.5 km/h (1.0
mph) lasting 30 seconds or more.
Judgement Criterion
• Changes in the intake air temperature is lower
than 1° C (1.8° F).
.
FAIL-SAFE AND BACKUP FUNCTION
• Control as if the intake air temperature is 25 ° C.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function − OBD-II Drive Cycle −
Pattern 7
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Intake air temperature sensor 1 failed.
• Harness damage or connector damage.
• ECM failed.
End
Malfunction
Yes
Yes
No
No
Yes
No
Go/stop operation
for specified times
Intake air temp.
changes
Monitoring
conditions
Good
Start
AK604314
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-170
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
STEP 1. Using scan tool MB991958, check data list item 5:
Intake Air Temperature Sensor 1.
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 mass airflow sensor from the air intake hose.
(3) Turn the ignition switch to the "ON" position.
(4) Set scan tool MB991958 to the data reading mode for item
5, Intake Air Temperature Sensor 1.
(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 mass airflow sensor.
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 − How to
Cope with Intermittent Malfunctions
.
NO : Go to Step 2.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
AK302200 AD
Intake air
temperature
sensor 1
Mass airflow
sensor
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-171
STEP 2. Check the intake air temperature sensor 1.
(1) Disconnect the intake air temperature sensor 1 connector
A-07.
(2) Measure the resistance between intake air temperature
sensor 1 side connector terminal No. 1 and No. 4.
(3) Measure resistance while heating the sensor using a hair
drier.
Standard value:
13 − 17 kΩ [at − 20° C (− 4° F)]
5.4 − 6.6 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)]
0.31 − 0.43 kΩ [at 80° C (176° F)]
Q: Is the measured resistance at the standard value?
YES : Go to Step 3.
NO : Replace the mass airflow sensor. Then go to Step 9.
STEP 3. Check harness connector A-07 at the intake air
temperature sensor 1 for damage.
Q: Is the harness 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.
STEP 4. Check the continuity at intake air temperature
sensor 1 harness side connector A-07.
(1) Disconnect the connector A-07 and measure at the harness
side.
(2) Check for the continuity between terminal No. 4 and
ground.
• Continuity (2 ohms or less)
Q: Does continuity exist?
YES : Go to Step 7.
NO : Go to Step 5.
AK704242
3 4
2
1
AB
Intake air temperature
sensor 1 connector
AK604487AC
Intake air
temperature
sensor 1
AK704236
2 1
3
4
A-07 harness
connector:
component side
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-172
STEP 5. Check harness connector B-10 at ECM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 6.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 9.
STEP 6. Check for harness damage between intake air
temperature sensor 1 connector A-07 (terminal No. 4) and
ECM connector B-10 (terminal No. 88).
Q: Is the harness wire in good condition?
YES : Replace the ECM. When the ECM is replaced,
register the ID code. Refer to GROUP 42B, ID Code
Registration Necessity Judgment Table <Vehicles
with KOS>
or GROUP 42C, ID Codes
Registration Judgment Table <Vehicles with WCM>
. Then go to Step 9.
NO : Repair it. Then go to Step 9.
STEP 7. Check harness connector B-10 at ECM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 8.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 9.
STEP 8. Check for harness damage between intake air
temperature sensor 1 connector A-07 (terminal No. 1) and
ECM connector B-10 (terminal No. 89).
Q: Is the harness wire in good condition?
YES : Replace the ECM. When the ECM is replaced,
register the ID code. Refer to GROUP 42B, ID Code
Registration Necessity Judgment Table <Vehicles
with KOS>
or GROUP 42C, ID Codes
Registration Judgment Table <Vehicles with WCM>
. Then go to Step 9.
NO : Repair it. Then go to Step 9.
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 − Pattern 7
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0111 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
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