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Home >> Toyota >> 1990 >> Pickup Base, 22-RE >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - 4-CYL EFI >> Emission: Dash Pot (DP) System (M/T Only) >> Inspection Of DP System >> Check VTV Operation

Check VTV Operation

Race the engine at 2.500 RPM for a few seconds, then release the throttle valve and check that the engine returns to idle in approximately 1 second. See Fig 4.

Fig 1: Exploded View Of Dash Pot
G50D14517Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Conditions For Checking Dash Pot Adjustment
G50E14518Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 3: Adjusting an Out-of-Range Dash Pot
G50F14519Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 4: Conditions For Verifying Correct Dash Post Adjustment
G50I14520Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002