Tacoma 2WD V6-3.4L (5VZ-FE) (1995)
Idle Speed/Throttle Actuator - Electronic: Testing and Inspection
On-Vehicle Inspection
1. INSPECT IDLE AIR CONTROL (IAC) VALVE OPERATION
Initial conditions:
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Engine at normal operating temperature.
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Idle speed checked correctly.
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Transmission in neutral position.
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A/C switch OFF.
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Using SST 09843-18020 or equivalent, connect terminals TE1 and E1 of the DLC1.
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After engine speed is kept at approx. 1,000 rpm for 5 seconds, check that it returns to idle speed.
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If the engine speed operation is not as specified, check the IAC valve, wiring and ECM.
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Remove the SST from the DLC1.
2. INSPECT IAC VALVE RESISTANCE.
NOTICE: Cold and Hot in the following sentences express the temperature of the coils themselves. Cold is from -10°C (14°F) to 50°C (122
°F) and Hot is from 50°C (122°F) to 100°C (212°F).
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Disconnect the IAC valve connector.
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Using an ohmmeter, measure the resistance between terminal +B and other terminals (RSC, RSO).
Resistance:
Cold: 17.0 - 24.5 0hms
Hot: 21.5 - 28.5 0hms
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If resistance is not as specified, replace the IAC valve.
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Reconnect the IAC valve connector.
3. INSPECT AIR ASSIST SYSTEM.
Initial conditions:
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Engine at normal operating temperature.
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Idle speed checked correctly.
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Transmission in neutral position.
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A/C switch OFF.