Mitsubishi Montero Sport (2004+). Manual — part 354
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-829
.
COMMENT
• The battery positive voltage is applied on the igni-
tion coil by the ignition switch-IG.
• When the PCM turns the power transistor in the
PCM "OFF," battery positive voltage is applied on
the ignition power transistor (terminals No. 1, No.
2 and No. 3), and the ignition power transistor
turns "ON."
• When the ignition power transistor turns "ON",
the ignition coil's primary circuit is grounded by
the ignition power transistor terminal No. 4. Then
the primary current flows to the ignition coil.
AK200051
CONNECTORS: A-05, A-06
A-05(B)
AB
A-06(B)
AK200051
CONNECTORS: A-44, A-45, A-46
A-44(B) A-45(B)
AC
A-46(B)
AK103738AB
CONNECTORS: C-89, C-90
PCM
C-89(GR) C-90(GR)
AK200052 AB
CONNECTOR: A-37
ENGINE SPEED
DETECTION
CONNECTOR
A-37(L)
AK103912AB
CONNECTOR: C-71
C-71
AK200035AB
CONNECTOR: D-08
D-08
JUNCTION BLOCK
(REAR SIDE)
AK200040AB
CONNECTOR: D-15
D-15(B)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-830
.
TROUBLESHOOTING HINTS (The most likely
causes for this case: )
• Malfunction of the ignition coil.
• Malfunction of the ignition power transistor.
• Improper connector contact, open circuit or
short-circuited harness wire.
• Malfunction of the PCM.
DIAGNOSIS
STEP 1. Check harness connectors A-44, A-45, A-46 at
ignition coil for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
STEP 2. Check the ignition coil.
Refer to GROUP 16, Ignition System
− Ignition Coil Check
.
Q: Are there any abnormalities?
YES : Go to Step 3.
NO : Replace the ignition coil. Then confirm that the
malfunction symptom is eliminated.
STEP 3. Check harness connectors A-05, A-06 at ignition
power transistor for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 4.
NO : Refer to GROUP 00E, Harness Connector Inspection
. Then confirm that the malfunction symptom
is eliminated.
AK200053
1
2
CONNECTORS: A-44, A-45, A-46
A-44(B)
A-45(B)
A-46(B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
AK200054
11
13 12
3
4
5
6
1
2
CONNECTORS: A-05, A-06
A-05(B)
AB
A-06(B)
A-06 HARNESS CONNECTOR:
COMPONENT SIDE
A-05 HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-831
STEP 4. Check the ignition power transistor.
Refer to GROUP 16, Ignition System
− Ignition Coil Power
Transistor Continuity Check
Q: Are there any abnormalities?
YES : Go to Step 5.
NO : Replace the ignition power transistor. Then confirm
that the malfunction symptom is eliminated.
STEP 5. Measure the power supply voltage at ignition coil
connectors A-44, A-45, A-46.
(1) Disconnect the connectors A-44, A-45, A-46 and measure
at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 1 and ground.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 6.
NO : Check harness connector D-08 at intermediate
connector for damage, and repair or replace as
required. Refer to 00E, Harness Connector Inspection
. If intermediate connector D-08 is in good
condition, repair harness wire between ignition switch
connector D-15 (terminal No. 2) and ignition coil
connectors A-44, A-45, A-46 (terminal No. 1). Then
confirm that the malfunction symptom is eliminated.
AK200053
1
2
CONNECTORS: A-44, A-45, A-46
A-44(B)
A-45(B)
A-46(B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
AK000723
1
2
A-44, A-45, A-46
HARNESS CONNECTOR:
COMPONENT SIDE
AC
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-832
STEP 6. Measure the power supply voltage at ignition
power transistor connector A-06.
(1) Disconnect the connector A-06 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminals No. 11, No. 12, No.
13 and ground.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 7.
NO : Repair harness wire between ignition coil connectors
A-44, A-45, A-46 (terminal No. 2) and ignition power
transistor connector A-06 (terminals No. No. 11, No.
12, No. 13). Then confirm that the malfunction
symptom is eliminated.
STEP 7. Measure the power supply voltage at ignition
power transistor connector A-05.
(1) Disconnect the connector A-05 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 battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 8.
NO : Check harness connector D-08 at intermediate
connector for damage, and repair or replace as
required. Refer to 00E, Harness Connector Inspection
. If intermediate connector D-08 is in good
condition, repair harness wire between ignition switch
connector D-15 (terminal No. 2) and ignition power
transistor connector A-05 (terminal No. 6). Then
confirm that the malfunction symptom is eliminated.
AK200474
11
13 12
CONNECTOR: A-06
AB
HARNESS
CONNECTOR:
COMPONENT
SIDE
A-06(B)
AKX01510AE
A-06 HARNESS
CONNECTOR:
COMPONENT SIDE
11
12
13
AK200475
3
4
5
6
1
2
CONNECTOR: A-05
AB
HARNESS
CONNECTOR:
COMPONENT
SIDE
A-05(B)
AKX01444
A-05 HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
3
4
5
6
AE
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