Mitsubishi Montero Sport (2004+). Manual — part 182
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-141
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 14:
Throttle Position 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
14, Throttle Position Sensor.
• With the throttle valve in the idle position, voltage should
measure between 0.535 and 0.735 volt.
• With the throttle valve in the full-open position, voltage
should measure between 4.5 and 5.5 volts.
(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-41 at throttle position 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 14.
AK303629AB
MB991911
MB991827
MB991824
16-PIN
AK000363
AK104027
4 3 2 1
CONNECTOR: A-41
AB
HARNESS CONNECTOR:
COMPONENT SIDE
A-41(B)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-142
STEP3. Check the throttle position sensor.
(1) Disconnect the connector A-41.
(2) Measure the resistance between throttle position sensor
side connector terminal No. 1 and No. 4.
Standard value: 3.5
− 6.5 kΩ
(3) Measure resistance between the throttle position sensor
side connector terminal No. 1 and No. 3.
(4) Move the throttle valve from the idle position to the full-open
position.
• Resistance should change smoothly in proportion to the
opening angle of the throttle valve.
Q: Is the resistance normal?
YES : Go to Step 4.
NO : Replace the throttle position sensor. Refer to Throttle
Body Assembly
− Disassembly And Assembly
STEP 4. Measure the sensor supply voltage at throttle
position sensor harness side connector A-41.
(1) Disconnect the connector A-41 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 4 and ground.
• Voltage should be between 4.8 and 5.2 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.8 and 5.2 volts?
YES : Go to Step 7.
NO : Go to Step 5.
AK000363
AK104027
4 3 2 1
CONNECTOR: A-41
AB
HARNESS CONNECTOR:
COMPONENT SIDE
A-41(B)
AK000320
1 2 3 4
THROTTLE POSITION
SENSOR SIDE
CONNECTOR
AB
AK000363
AK104027
4 3 2 1
CONNECTOR: A-41
AB
HARNESS CONNECTOR:
COMPONENT SIDE
A-41(B)
AK000236AH
A-41 HARNESS
CONNECTOR:
COMPONENT SIDE
4 3 2 1
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-143
STEP 5. Check connector C-90 at PCM 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
. Then go to Step 14.
STEP 6. Check for harness damage between throttle
position sensor connector A-41 (terminal No. 4) and PCM
connector C-90 (terminal No. 46).
Q: Is the harness wire in good condition?
YES : Replace the PCM. Then go to Step 14.
NO : Repair it. Then go to Step 14.
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
AK000363
AK104027
4 3 2 1
CONNECTOR: A-41
AB
HARNESS CONNECTOR:
COMPONENT SIDE
A-41(B)
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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-144
STEP 7. Check for continuity at throttle position sensor
harness side connector A-41.
(1) Disconnect the connector A-41 and measure at the harness
side.
(2) Measure the continuity between terminal No. 1 and ground.
• Should be less than 2 ohms.
Q: Does continuity exist?
YES : Go to Step 10.
NO : Go to Step 8.
STEP 8. Check connector C-90 at PCM for damage.
Q: Is the connector in good condition?
YES : Go to Step 9.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 14.
AK000363
AK104027
4 3 2 1
CONNECTOR: A-41
AB
HARNESS CONNECTOR:
COMPONENT SIDE
A-41(B)
AK000237AG
A-41 HARNESS
CONNECTOR:
COMPONENT SIDE
4 3 2 1
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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