Toyota 4-Runner 1985 Repair Manual page 109

EMISSION CONTROL SYSTEMS (EFI) - Dash Pot (DP) System EC-9
Throttle
Valve Open
rfDl
t1:j
DP Diaphragm
Throttle Valve
Released
rrl
t!:j
DP is Set
DP Adjusting
Screw
Eel178
INSPECTION OF DP SYSTEM
1. WARM UP ENGINE
2. CHECK IDLE SPEED AND ADJUST, IF NECESSARY
3. CHECK DP SETTING SPEED
(a) Maintain the engine speed at 2,500 rpm.
(b) Pinch the vacuum hose between the DP and VTV.
(c) Release the throttle valve.
(d) Check that the DP is set.
DP setting speed: 2,000 rpm
If not at specified speed, adjust with the DP adjusting
screw.
4. CHECK OPERATION OF VTV
(a) Set the DP speed in the same procedure as above;
3.
(a)
to (c).
(b) Release the pinched hose and check that the engine
returns to idle speed in about 1 second.