FI SYSTEM 4-65
Fast idle cam
STV actuator
Throttle
valve lever
The throttle valve lever
opens throttle valve a little
to increase the engine speed.
FAST IDLE INSPECTION
The fast idle system is automatic type.
When the fast idle cam is turned by the secondary
throttle valve actuator, the cam pushes the lever on
the throttle valve shaft causing the throttle valve to
open and raise the engine speed. When the engine
has warmed up, depending on the oil temperature
and lapsed time, the fast idle is cancelled allowing
the engine to resume idle speed.
* Fast idle cancellation occurs in 30 seconds at the
ambient temperature of 25°C.
* Fast idle cancellation occurs in 5 minutes at the
ambient temperature of –10°C.
If the voltage measured is out of specification, loosen
the TP sensor screws and adjust the output voltage
to specification.
NOTE:
If fast idle fine adjustment is required or the screw
A
has been removed, the following adjustment will be-
come necessary.
ADJUSTMENT BY FAST IDLE SCREW
The fast idle screw is factory-adjusted at the
time of delivery and therefore avoid remov-
ing or turning it unless otherwise necessary.
Should the adjustment become necessary,
perform the following procedures.
• Measure the voltage when the throttle valve is fully
closed.
TP sensor output voltage at full closed
position: 1.12 V
If the voltage measured is out of specification, move
the TP sensor to adjust the voltage to specification.
• Open the secondary throttle valve gradually and just
when the STP sensor voltage has become 3.6 V,
stop the valve opening and check for variation of
the TP sensor output voltage.
TP sensor output voltage variation: 0.035
V at STP sensor output voltage of 3.6 V
If the voltage variation is more than or less than 0.035
V, perform adjustment by the fast idle adjust screw
A.
If, under the above conditions, the fast idle cannot be
cancelled, the cause may possibly be short-circuit in
oil temperature sensor or wiring harness.
Fast idle rpm
(Standard): 1 500 – 1 700 rpm/Cold engine
(Maximum) : 2 000 rpm/Cold engine
Idle rpm: 1 100 ± 100 rpm/Warmed engine
FAST IDLE ADJUSTMENT
• Remove the fuel tank (4-48)
• Open the secondary throttle valve fully by turning
its link with the finger. With the secondary throttle
valve held at this position, measure the output volt-
age of TP sensor. (4-36)
TP sensor output voltage: 1.195 V
\ 09900-25008: Multi circuit tester
W Tester knob indication: Voltage (
)
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