Dash Pot Dp System

VTV Air Filltr

VTV Air Filltr

Toyota Dashpot
Dash Pot

Normal Driving

Toyota Mr2 Dash Pot
VTV

fCtlift

Deceleration

DP Diaphragm

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To reduce HC and CO emissions, when decelerating the dash pot opens the throttle valve slightly more than at idle. This causes the air-fuel mixture to burn completely.

Condition

Diaphragm

VTV

Throttle Valve

Idling

Pushed in by return force of throttle valve

CLOSED

Idle speed position

Normal driving

Pushed out by diaphragm spring

OPEN

High speed position

Deceleration

Pushed in by return force of throttle valve

CLOSED

Slightly opens and then slowly closes to idle position

INSPECTION OF DP SYSTEM

1. WARM UP ENGINE

2. CHECK IDLE SPEED

Toyota Celica Engine Vacuum

3. CHECK DP SETTING SPEED

(a) Maintain engine speed at 3,000 rpm.

(b) Pinch the vacuum hose between DP and VTV.

(c) Release the throttle valve.

(d) Check that the DP is set. DP setting speed: 2,000 rpm ten is

If not at specified speed, adjust with the DP adjusting bolt.

Dash Pot Vtv Filter Toyota 22re

4. CHECK OPERATION OF VTV

(a) Set the DP speed in the same procedure as above; (a) to (c).

(b) Release the pinched hose and check that the engine returns to idle speed in about 1 second.

IF NO PROBLEM IS FOUND WITH THIS INSPECTION. THE SYSTEM IS OKAY; OTHERWISE INSPECT VTV

Pinch

Dashpot Landcruiser

V3lvc Released

V3lvc Released ten is

Pinch

INSPECTION OF VTV

1. CHECK AND CLEAN FILTER ON VTV

(a) Check the filter for contamination or damage.

(b) Using compressed air, clean the filter.

2. CHECK VTV BY BLOWING AIR INTO EACH SIDE

(a) Check that air flows without resistance from B to A.

(b) Check that air flows with difficulty from A to B.

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