Mitsubishi FUEL User Manual

MPI <6A1> -
Troubleshooting
13A-174
INSPECTION PROCEDURE 30
A/C switch and A/C relay system
Probable cause
When an A/C ON signal is input to the engine-ECU, the engine-ECU carries out
control of the idle speed control (ISC) servo, and also operates the A/C compressor
magnetic clutch.
D
Malfunction of A/C control system
D
Malfunction of A/C switch
D
Improper connector contact, open circuit or
short-circuited harness wire
D
Malfunction of the engine-ECU
Check the A/C compressor relay.
(Refer to GROUP 55 - On-vehicle Service.)
NG
Replace
OK
Measure at the engine-ECU connectors C-166, C-168.
D
Disconnect the connector, and measure at the harness side.
D
Voltage between 20 and earth, and 83 and earth
(Ignition switch: ON)
OK:
0 - 3 V (A/C switch: OFF)
System voltage (A/C switch: ON)
D
Short circuit between 20 and earth
(Ignition switch: ON, A/C switch: ON)
OK:
A/C compressor clutch turns on.
NG
Check the A/C system. (Refer to GROUP 55 - Troubleshooting.)
OK
Check the following
connectors:
C-166, C-168
NG
Replace
OK
Check trouble symptom.
NG
Replace the engine-ECU.
INSPECTION PROCEDURE 31
Ignition circuit system
Probable cause
The engine-ECU interrupts the ignition coil primary current by turning the ignition
power transistor inside the engine-ECU ON and OFF.
D
Malfunction of ignition coil
D
Malfunction of power transistor unit
D
Improper connector contact, open circuit or
short-circuited harness wire
D
Malfunction of the engine-ECU

Mitsubishi FUEL Specifications

General

Brand	Mitsubishi
Model	FUEL
Category	Automobile Accessories
Language	English