Engine control system
EFI system
On-vehicle inspection........................................
- Inspection of the voltage of power steering oil pres-
sure sensor
Measure the voltage between PS terminal and E2 terminal
with ohmmeter - Inspection of stepping motor
(a) With engine running at idle speed, pull out the connection harness of stepping motor, and the change
of engine rotating speed indicates that the stepping motor operates normally.
(b) Pull out the connection harness of stepping motor, and measure the terminal current with universal
meter. When engine is running, there being impulse current output at the terminal indicates that there
is no trouble with ECU and stepping motor control system, and if idling is not stable at the moment
and deviates greatly from specified value, the stepping motor should be replaced. If there is no
impulse current output at the terminal, turn on air conditioner to test again, and still no impulse
current output indicates that there is trouble with ECU and stepping motor control system circuit.
(c) Check the malfunction of stepping motor circuit with diagnostic instrument.
Engine control system·- EFI system8
Conditions Voltage (V)
Not turning steering wheel with
engine at idle speed
Turning steering wheel with
engine at idle speed 0-1.