Tacoma 2WD V6-3.4L (5VZ-FE) (1995)
Idle Up Control Valve: Initial Inspection and Diagnostic Overview
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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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Turn the A/C switch ON.
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Using SST 09843-18020, connect terminals TE1 and E1 of the DLC1, check that idle-up occurs for approx. 3 seconds.
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Valve operation is faulty if during the idle-up period the engine speed drops by 100 rpm or more, rough idle occurs, or the engine stalls.
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Observe the idle speed for approx. 3 to 15 seconds. During this time the idle-up valve should go off, the Idle Air Control (IAC) valve
half-open and idle-up should occur.
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After approx. 15 seconds, check that the idle speed does not vary greatly from the idle speed observed in previous step. The idle-up valve
should now be in ON position.
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If the idle speed is increased by more 100 rpm, use a 4 mm hexagon wrench, turn the idle-up valve adjustment screw to correct the idle-up
valve.
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Remove the SST 09843-18020 from the DLC1.
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Turn the A/C switch OFF.