How to repair a bad leak detection pump?
The proper repair of a bad evaporative leak detection pump involves a thorough understanding of how the various computer controlled and monitored components in the Evaporative Emissions Control System interact with each other.
Where is the evaporative leak detection pump located?
The evaporative leak detection pump itself is often located in a difficult-to-access location and may require the removal of some or all of the car’s exhaust system.
How does a Bosch leak detection pump work?
The leak detection pump continuously checks for leaks in the EVAP system to ensure it is functioning properly. You can install Bosch leak detection pumps with complete confidence knowing that they are of the highest quality and meet or exceed OE specifications in fit, form, and function.
How to diagnose leak detection pump switch p1494?
If you have a P1494 EVAP Leak Detection Pump Switch or Mechanical Fault trouble code, this post will help you understand what it is and how to fix it. To diagnose this problem, follow this procedure: Turn the key to the ON position.
What is the purpose of a leak detection pump?
The main purpose of the LDP is to pressurize the fuel system for leak checking. It closes the EVAP system vent to atmospheric pressure so the system can be pressurized for leak testing. The diaphragm is powered by engine vacuum. It pumps air into the EVAP system to develop a pressure of about 7.5′ H20 (1/4) psi.
How does the evaporative leak detection system work?
A key part of the Evaporative Emissions Control System is the evaporative leak detection pump. By pressurizing the fuel system, the evaporative leak detection pump allows the engine computer to detect any leaks which may be permitting gas vapors to escape.
Can a bad leak detection pump cause a smog test?
A bad evaporative leak detection pump can cause your vehicle to fail a smog test. Many factors can cause a bad evaporative leak detection pump, but there is a single warning sign of a bad evaporative leak detection pump: Your Check Engine Light illuminates.
What to do if you have a leak in your EVAP system?
If the first checks pass, the PCM then uses the LDP to seal the vent valve and pump air into the system to pressurize it. If a leak is present, the PCM will continue pumping the LDP to replace the air that leaks out.