Mazda RX7. Manual - part 36
DECELERATION CONTROL SYSTEM
Article Text (p. 5)
1983 Mazda RX7
For www.iluvmyrx7.com
Copyright © 1998 Mitchell Repair Information Company, LLC
Sunday, August 26, 2001 04:58PM
Fig. 4: Testing Shutter Solenoid Valve Signal
5) On automatic transmissions, shift into "P" or "N".
Current should NOT flow to solenoid valve terminal at any engine
speed. If solenoid valve does not respond as described, replace
shutter solenoid valve.
NOTE: Before replacing shutter solenoid valve, check auxiliary
control unit as outlined in "Mazda RX7 Auxiliary Control
Device" article in this section. Also check relief solenoid
valve and switching solenoid valve as described in "Mazda
RX7 Air Injection System" article in this section.
COASTING/SHUTTER VALVE
1) Warm engine to normal operating temperature. Stop engine.
Disconnect air cleaner-to-coasting valve hose at air cleaner. Start
engine and run at idle. Place finger over disconnected hose; air
should not be drawn into hose.
2) Disconnect electrical connector from shutter solenoid
valve (Yellow dot). Air should be drawn into disconnected hose and
idle should fluctuate.
3) At the same time, the coasting valve rod should be pulled
into coasting valve about .4" (10mm), opening shutter valve. Replace
coasting/shutter valve if it does not respond as outlined.
DASHPOT (MAN. TRANS. ONLY)
1) Remove air cleaner. Checking all vacuum sensing tubes for
proper condition and connections. Check that dashpot rod does not
bind throttle lever movement.
2) Quickly operate throttle lever fully and make sure
dashpot rod extends quickly. Release throttle lever and make sure
that throttle lever returns slowly to idle position after it has
touched dashpot rod.
3) Connect tachometer to engine. Start engine and warm to
operating temperature. Ensure engine idle speed is adjusted to
specification. Operate throttle lever until it is away from dashpot
rod.
4) Slowly decrease engine speed and check speed at which
throttle lever just touches dashpot rod. It should be 3800-4200 RPM.