Mitsubishi Montero (2004+). Manual — part 363
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-939
STEP 9. Check connector B-25X at engine speed detection
and connector D-134 at PCM for damage.
Q: Is the connector in good condition?
YES : Go to Step 10.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
AK200979
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AB
B-25X
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-25X
AK201166
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CONNECTOR: D-134
AB
PCM
D-134(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-940
STEP 10. Check for open circuit and short circuit to
ground and harness damage between engine speed
detection connector B-25X and PCM connector D-134
(terminal No. 87).
Q: Is the harness wire in good condition?
YES : Replace the PCM. Then confirm that the malfunction
symptom is eliminated.
NO : Repair it. Then confirm that the malfunction symptom
is eliminated.
AK200979
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2
3
AB
B-25X
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-25X
AK201166
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CONNECTOR: D-134
AB
PCM
D-134(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-941
INSPECTION PROCEDURE 32: A/C system.
.
COMMENT
• When the A/C is "ON", the battery positive volt-
age is applied on the PCM (terminal No. 69) from
the A/C belt lock-ECU.
When battery positive voltage is applied to the
PCM, the PCM turns "ON" the power transistor in
the PCM. The PCM delays A/C engagement
momentarily while it increases idle rpm. Then the
A/C compressor clutch relay coil will be ener-
gized.
With this, the A/C compressor clutch relay turns
"ON", and the A/C compressor clutch operates.
.
TROUBLESHOOTING HINTS (The most likely
causes for this case: )
• Malfunction of the A/C control system.
• Malfunction of the A/C switch.
• Improper connector contact, open circuit or
short-circuited harness wire.
• Malfunction of the PCM.
GREEN-RED
ORANGE
AK302914
8
POWERTRAIN CONTROL MODULE (PCM)
AUTOMATIC
COMPRESSOR
CONTROLLER *
2
A/C COMPRESSOR
RELAY
69
A/C-ECU *
1
*
1
: AUTOMATIC A/C SYSTEM
*
2
: MANUAL A/C SYSTEM
A/C Circuit
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5
6 7 8 9
4
20
21 22
232425
2627
10111213
14 15
16 1718
19
D-132
(MU803802)
61
656667686970 717273
74757677787980 8182
8384
858687
8889
62
6364
D-134
(MU803804)
AK201038AJ
CONNECTORS: D-132, D-134
PCM
D-134(GR)
D-132(GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-942
DIAGNOSIS
STEP 1. Check harness connector D-132, D-134 at PCM 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 circuit at PCM connector D-132.
(1) Disconnect the connectors D-132 and measure at the
harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 8 and ground.
• Voltage should be battery positive voltage.
(4) Using a jumper wire, connect terminal No. 8 to ground.
• A/C compressor relay should turn "ON".
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage and A/C compressor relay condition
normal?
YES : Go to Step 3.
NO : Refer to GROUP 55, Diagnosis
− Introduction To
Heater, Air Conditioning And Ventilation Diagnosis
. Then confirm that the malfunction symptom
is eliminated.
AK201281
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CONNECTORS: D-132, D-134
PCM
D-134(GR)
D-132(GR)
AB
D-132 HARNESS CONNECTOR:
COMPONENT SIDE
D-134 HARNESS CONNECTOR:
COMPONENT SIDE
AK200938
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AB
CONNECTOR: D-132
HARNESS CONNECTOR:
COMPONENT SIDE
PCM
D-132(GR)
AK201387
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D-132 HARNESS
CONNECTOR:
COMPONENT SIDE
AK201387AB
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