Mitsubishi Montero Sport (2004+). Manual — part 173
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-105
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 4.6 volts or higher [corresponding
to an air intake temperature of
−40°C (−40°F) or
lower] for 2 seconds.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II 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, or
connector damage.
• PCM failed.
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)
13A-106
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I
• 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) 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 A-01 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.
AK303629AB
MB991911
MB991827
MB991824
16-PIN
AK103913
3
4
5
1
2
6
7
CONNECTOR: A-01
A-01(B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-107
STEP 3. Check the intake air temperature sensor.
(1) Disconnect the intake air temperature sensor connector
A-01.
(2) Measure the resistance between intake air temperature
sensor side connector terminal No. 5 and No. 6.
• There should be continuity. (0.30 − 20 kΩ)
Q: Is the measured resistance between 0.30 and 20 k
Ω?
YES : Go to Step 4.
NO : Replace the volume airflow sensor. Then go to Step
11.
STEP 4. Measure the sensor supply voltage at intake air
temperature sensor harness side connector A-01.
(1) Disconnect the connector A-01 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 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.
AK103913
3
4
5
1
2
6
7
CONNECTOR: A-01
A-01(B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
AK000319AB
1 2 3 4 5 6 7
INTAKE AIR TEMPERATURE
SENSOR SIDE CONNECTOR
AK103913
3
4
5
1
2
6
7
CONNECTOR: A-01
A-01(B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
AKX01408
A-01 HARNESS CONNECTOR:
COMPONENT SIDE
7 6 5 4 3 2 1
AK
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-108
STEP 5. Measure the sensor supply voltage at PCM
connector C-90 by backprobing.
(1) Do not disconnect the PCM connector C-90.
(2) Disconnect the intake air temperature sensor connector
A-01.
(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between terminal No. 64 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 measured voltage between 4.5 and 4.9 volts?
YES : Go to Step 6.
NO : Go to Step 7.
STEP 6. Check connector C-90 at PCM for damage.
Q: Is the connector in good condition?
YES : Repair harness wire between intake air temperature
sensor connector A-01 (terminal No.6) and PCM
connector C-90 (terminal No. 64) because of open
circuit. Then go to Step 11.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 11.
AK103762
42
43
48
49
50
51
52
53
54
55
56
57
46 45 44
58
59
60
61
62
63
64
65
66
47
41
AB
CONNECTOR: C-90
C-90(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AKX01525
AKX01525 AG
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
C-90 HARNESS CONNECTOR:
HARNESS SIDE
AK103762
42
43
48
49
50
51
52
53
54
55
56
57
46 45 44
58
59
60
61
62
63
64
65
66
47
41
AB
CONNECTOR: C-90
C-90(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
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