MPI <4G9> -
Troubleshooting
13A-161
Terminal
No. <M/T>
Normal condition
Check condition (Engine condition)
Check item
Terminal
No. <A/T>
12
41
Power supply
Ignition switch: ON
System voltage
25
47
19
19
Air flow sen-
Engine: Idle speed
0 - 1 V
sor reset
signal
Engine r/min: 3,000 r/min
6 - 9 V
20
17
Fan motor
relay (HI)
Radiator fan is not operating (Engine
coolant temperature is 90
_
C or less)
System voltage
Radiator fan is not operating (Englne
coolant temperature is 105
_
C or less)
0 - 3 V
21
18
Fan motor
relay (LO)
Radiator fan and condenser fan are not
operating (Engine coolant temperature
is 90
_
C or less)
System voltage
Radiator fan and condenser fan are not
operating (Engine coolant temperature
is 90 - 105
_
C or less)
0 - 3 V
8 or 22*
20 or 21*
Fuel pump
Ignition switch: ON
System voltage
relay
Engine: Idle speed
0 - 3 V
33
8
Alternator G
terminal
D
Engine: Warm, idle
(radiator fan: OFF)
D
Headlamp: OFF to ON
D
Rear defogger switch: OFF to ON
D
Brake lamp: ON
Voltage rises by 0.2 - 3.5 V.
41
54
Alternator FR
terminal
D
Engine: Warm, idle
(radiator fan: OFF)
D
Headlamp: OFF to ON
D
Rear defogger switch: OFF to ON
D
Brake lamp: ON
Voltage drops by 0.2 - 3.5 V.
36
22
Engine warn-
ing lamp
Ignition switch: “LOCK” (OFF) position
®
ON
0 - 3 V
®
9 - 13 V
(After several seconds have
elapsed)
37
52
Power steer-
ing fluid
Engine: Idling after
warming up
When steering
wheel is stationary
System voltage
pressure
switch
When steering
wheel is turned
0 - 3 V
38
49
Control relay
Ignition switch: “LOCK” (OFF) position
System voltage
(Power sup-
ply)
Ignition switch: ON
0 - 3 V
45
83
A/C switch 1
Engine: Idle speed
Turn the A/C
switch OFF
0 - 3 V
Turn the A/C
switch ON (A/C
compressor is
operating)
System voltage
58
43
Tachometer
signal
Engine r/min: 3,000 r/min
0.3 - 3.0 V