Corolla LE Sedan L4-1762cc 1.8L DOHC MFI (1998)
Idle Speed/Throttle Actuator - Electronic: Component Tests and General Diagnostics
Component Inspection
INSPECTION
INSPECT IAC VALVE OPERATION
(a) Check that the IAC valve is half opened.
(b) Connect the IAC valve connector to the IAC valve.
(c) Disconnect the ECT sensor connector from the ECT sensor.
(d) Turn the ignition switch ON.
(e) Check that the IAC valve moves.
HINT: Repeat connecting and disconnecting of IAC valve connector several times and check the operation of the valve.
If operation is not as specified replace the IAC valve.
(f) Turn the ignition switch OFF.
(g) Connect the ECT sensor connector to the ECT sensor.
(h) Disconnect the IAC valve connector from the IAC valve.
On-Vehicle Inspection
ON-VEHICLE INSPECTION
INSPECT IAC VALVE OPERATION
(a) initial conditions:
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Engine at normal operating temperature idle speed set correctly
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Transmission in neutral
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A/C switch OFF
(b) Using SST, connect terminals TE1 and E1 of the DLC1.
SST 09843-18020
(c) After engine speed are kept at 900 - 1,300 rpm for 5 seconds, check that they return to idle speed.
