Mitsubishi 380. Manual — part 635
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>
13A-632
STEP 7. Check for open circuit, short circuit to ground or
harness damage between ignition coil connector and ECU
connector.
AK303233
1
2
3
AB
B-118 (GR)
B-102 (GR)
B-101 (GR)
B-117 (GR)
B-103 (GR)
B-114 (GR)
CONNECTOR: B-101, B-102, B-103, B-114,
B-117, B-118
HARNESS CONNECTOR:
COMPONENT SIDE
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>
13A-633
NOTE: Check harness after checking intermediate connector
B-32. If intermediate connector is damaged, repair or replace it.
Refer to GROUP 00E, Harness Connector Inspection. Then
confirm that the malfunction symptom is eliminated.
a. Check the harness wire between ignition coil connector
B-101 (terminal No. 3) and ECU connector B-20 (terminal
No. 07) at ignition coil 1.
b. Check the harness wire between ignition coil connector
B-118 (terminal No. 3) and ECU connector B-20 (terminal
No. 22) at ignition coil 2.
c. Check the harness wire between ignition coil connector
B-102 (terminal No. 3) and ECU connector B-20 (terminal
No. 36) at ignition coil 3.
d. Check the harness wire between ignition coil connector
B-117 (terminal No. 3) and ECU connector B-20 (terminal
No. 51) at ignition coil 4.
e. Check the harness wire between ignition coil connector
B-103 (terminal No. 3) and ECU connector B-20 (terminal
No. 37) at ignition coil 5.
f. Check the harness wire between ignition coil connector
B-114 (terminal No. 3) and ECU connector B-20 (terminal
No. 52) at ignition coil 6.
Q: Is the harness wire in good condition?
YES : Replace the ECU. Then confirm that the malfunction
symptom is eliminated.
NO : Repair it. Then confirm that the malfunction symptom
is eliminated.
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>
13A-634
INSPECTION PROCEDURE 28: A/C system.
.
COMMENT
• When the A/C is "ON" the ECU turns "ON" the
power transistor in the ECU. The ECU delays A/C
engagement momentarily while it increases idle
r/min. Then the A/C compressor clutch relay coil
will be energized.
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.
• Improper connector contact, open circuit or
short-circuited harness wire.
• Malfunction of the ECU.
• Refer to component locations GROUP-
• Refer to configuration diagrams GROUP-
• Refer to circuit diagrams GROUP-
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>
13A-635
DIAGNOSIS
STEP 1. Using diagnostic tool, check actuator test item 16:
A/C Relay.
CAUTION
To prevent damage to diagnostic tool, always turn the igni-
tion switch to the "LOCK" (OFF) position before connect-
ing or disconnecting diagnostic tool.
(1) Connect diagnostic tool to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set diagnostic tool to the actuator test mode for item 16,
A/C Relay.
• An operation sound of the relay should be heard.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the A/C Relay operating properly?
YES : Replace the ECU. Then confirm that the malfunction
sympton is eliminated.
NO : Go to Step 2.
STEP 2. Check harness connector B-21 at ECU for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
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