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Home >> Toyota >> 1981 >> Pickup Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Auxiliary Accelerator Pump System >> Testing >> Auxiliary Accelerator Pump (AAP)
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Auxiliary Accelerator Pump (AAP)

  1. On Corolla and Tercel models, check that engine coolant temperature is below 122°F (50°C). On Pickup models, check that coolant temperature is below 131°F (55°C). Remove air cleaner and start engine.
  2. Pinch AAP vacuum hose and stop engine. Release vacuum hose and ensure that gasoline spurts out of accelerator nozzle.
  3. Warm engine to normal operating temperature. Pinch vacuum hose and stop engine. Check that gasoline does not spurt from accelerator nozzle. If no problem was found, system is okay.
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