Previa Van RWD L4-148.8 2438cc 2.4L DOHC SC (2TZ-FZE) (1996)
Idle Speed/Throttle Actuator - Electronic: Component Tests and General Diagnostics
INSPECTION
1. Inspect idle air control valve operation.
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Initial conditions:
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Engine at normal operating temperature.
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Idle speed set correctly.
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Transmission in neutral position.
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Using SST, connect terminals TE1 and E1 of the data link connector 1 (SST 09843-18020).
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After engine rpm are kept at 1,000 - 1,200 rpm for 5 seconds, check that the rpm drops about 200 rpm. If the rpm operation is not as specified,
check the idle air control valve, wiring and engine control module.
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Remove SST (SST 09843-18020).
2. Inspect idle air control valve resistance.
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Disconnect the idle air control valve connector.
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Using an ohmmeter. measure the resistance between terminal +B and other terminals (ISC1, ISC2).
Resistance: 18.8 - 22.8 Ohms
If resistance is not as specified, replace the idle air control valve.
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Reconnect the idle air control valve connector.