MPI <4G9> -
Troubleshooting
13A-162
Terminal
No. <M/T>
Normal condition
Check condition (Engine condition)
Check item
Terminal
No. <A/T>
60
3
Oxygen
Engine: Idling after warming up
0 - 3 V
sensor (front)
heater
Engine r/min: 5,000 r/min
System voltage
54
26
Oxygen
Engine: Idling after warming-up
0 - 3 V
sensor (rear)
heater
Engine r/min: 5,000 r/min
System voltage
71
58
Ignition
switch - ST
Engine: Cranking
8 V or more
72
64
Intake air
temperature
sensor
Ignition switch:
ON
When intake air
temperature is
0
_
C
3.2 - 3.8 V
When intake air
temperature is
20
_
C
2.3 - 2.9 V
When intake air
temperature is
40
_
C
1.5 - 2.1 V
When intake air
temperature is
80
_
C
0.4 - 1.0 V
75
73
Oxygen sen-
sor (rear)
D
Transmission: 2nd gear <M/T>,
L range <A/T>
D
Engine r/min: 3,500 r/min or more
D
Driving with the throttle valve
widely open
0.6 - 1.0 V
76
71
Oxygen
sensor (front)
Engine: Running at 2,500 r/min after
warmed up (Check using a digital type
voltmeter)
0
«
0.8 V
(Changes repeatedly)
80
66
Backup pow-
er supply
Ignition switch: “LOCK” (OFF) position
System voltage
81
46
Sensor im-
pressed
voltage
Ignition switch: ON
4.5 - 5.5 V
82
98
Ignition
switch - IG
Ignition switch: ON
System voltage
83
44
Engine cool-
ant
temperature
Ignition switch:
ON
When engine
coolant tempera-
ture is 0
_
C
3.2 - 3.8 V
sensor
When engine
coolant tempera-
ture is 20
_
C
2.3 - 2.9 V
When engine
coolant tempera-
ture is 40
_
C
1.3 - 1.9 V
When engine
coolant tempera-
ture is 80
_
C
0.3 - 0.9 V
