MPI – Troubleshooting
13-23
Terminal
No.
Normal conditionCheck condition (Engine condition)Check item
21 Fan motor relay (LOW) Fan not operating (coolant temperature: 90_C or
below)
Battery voltage
Fan at low speed (coolant temperature: 90 – 100_C) 0 – 3 V
22 A/C relay D Engine: Idling
D A/C switch: OFF to ON (Compressor is being
driven.)
Battery voltage, or 6 V
or more instanta-
neously to 0 – 3 V
33 Alternator G terminal D Engine: Warm, idle (radiator fan: OFF)
D Headlamp: OFF to ON
D Brake lamp: OFF to ON
D Rear defogger switch: OFF to ON
Voltage rises by 0.2 –
3.5 V.
36 Engine warning lamp Ignition switch: OFF → ON 0 – 3 V → Battery
voltage (After several
seconds have
elapsed)
37 Power steering fluid
pressure switch
Engine: Idling after
warming up
When steering wheel is
stationary
Battery voltage
When steering wheel is
turned
0 – 3 V
38 Control relay Ignition switch: OFF Battery voltage
Ignition switch: ON 0 – 3 V
39 Fuel pump relay No.2 While engine is idling, suddenly depress the
accelerator pedal.
Momentarily rises
slightly from 0 to 3 V.
40 Exhaust temperature
warning lamp
Ignition switch: OFF to ON 0 – 3 V to battery
voltage (After several
seconds have
elapsed)
41 Alternator FR terminal D Engine: Warm, idle (radiator fan: OFF)
D Headlamp: OFF to ON
D Brake lamp: OFF to ON
D Rear defogger switch: OFF to ON
Voltage drops by 0.2 –
3.5 V.
45 A/C switch Engine: Idle speed Turn the A/C switch OFF 0 – 3 V
Turn the A/C switch ON
(A/C compressor is oper-
ating)
Battery voltage
60 Oxygen sensor heater
Engine: Idling 0 – 3 V
vo
u
on-
on
y
Engine speed: 5,000 r/min Battery voltage
71 Ignition switch-ST Engine: Cranking 8 V or more
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