Throttle Positioner

With air hose from coasting valve air inlet to air cleaner disconnected, plug air inlet. Start engine and run at 2000 RPM, proceed as follows:

1. Disconnect wire to coasting valve and connect a wire directly from battery to coasting valve solenoid. Release the throttle suddenly. RPM should drop to 950±50 RPM.
   Fig 1: Testing Throttle Positioner

   Courtesy of MAZDA MOTORS CORP.
2. If engine speed does not stabilize at this speed, adjust throttle positioner. When direct lead from battery is disconnected from coasting valve solenoid, engine speed should drop to 800 RPM.