T100 Pickup 2WD V6-3.4L (5VZ-FE) (1996)
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Using SST, connect terminals TE1 and E1 of the DLC1.
SST 09843-18020
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After engine speed is kept at 900 - 1,300 rpm for 10 seconds, check that it returns to idle speed.
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Stop the engine.
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Disconnect the air assist hose from the IAC valve, and plug it.
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Start the engine and check that the idle speed reaches 500 rpm or below (the engine may stall).
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If the idle does not reach 500 rpm or below, check for a leak between the air assist hoses, pipe and injectors.
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Remove the SST from the DLC1.
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Reconnect the air assist hose to the IAC valve.