MPI – Troubleshooting
13-24
Terminal
No.
Normal conditionCheck condition (Engine condition)Check item
72 Intake air temperature
sensor
Ignition switch: ON When intake air tempera-
ture is 0_C
3.2 – 3.8 V
When intake air tempera-
ture is 20_C
2.3 – 2.9 V
When intake air tempera-
ture is 40_C
1.5 – 2.1 V
When intake air tempera-
ture is 80_C
0.4 – 1.0 V
76 Oxygen sensor Engine: Running at 2,000 r/min after having been
warmed up (Check using a digital type voltmeter)
0 ↔ 0.8 V
(Changes repeatedly)
80 Backup power supply Ignition switch: OFF Battery voltage
81 Sensor impressed
voltage
Ignition switch: ON 4.5 – 5.5 V
82 Ignition switch-IG Ignition switch: ON Battery voltage
83 Engine coolant
temperature sensor
Ignition switch: ON When engine coolant
temperature is 0_C
3.2 – 3.8 V
When engine coolant
temperature is 20_C
2.3 – 2.9 V
When engine coolant
temperature is 40_C
1.3 – 1.9 V
When engine coolant
temperature is 80_C
0.3 – 0.9 V
84 Throttle position sensor Ignition switch: ON Set throttle valve to idle
position
0.3 – 1.0 V
Fully open throttle valve 4.5 – 5.5 V
85 Barometric pressure
Ignition switch: ON When altitude is 0 m 3.7 – 4.3 V
sensor
When altitude is 1,200 m 3.2 – 3.8 V
86 Vehicle speed sensor D Ignition switch: ON
D Move the vehicle slowly forward
0 ↔ 5 V
(Changes repeatedly)
87 Idle position switch Ignition switch: ON Set throttle valve to idle
position
0 – 1 V
Slightly open throttle
valve
4 V or more
88 Camshaft position
Engine: Cranking 0.4 – 3.0 V
sensor
Engine: Idle speed 0.5 – 2.0 V
89 Crank angle sensor Engine: Cranking 0.4 – 4.0 V
Engine: Idle speed 1.5 – 2.5 V
90 Air flow sensor Engine: Idle speed 2.2 – 3.2 V
Engine speed: 2,500 r/min
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