Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pressure Operated Electric Air Control/Electric Air Switching Valve (PEDES)
Pressure Operated Electric Air Control/Electric Air Switching Valve (PEDES) is used on all Federal vehicles except (5.0L VIN Y and W Body 2.8L and 3.1L manual transaxle) combines both diverter function and air switching function into one integral component. See Fig 1 .
The PEDES valve is electrically controlled by the ECM and operated by air pump pressure. The valve's operation is not dependent on intake manifold vacuum.
For cold engine (open loop) operation, the port solenoid is energized and air flows to exhaust ports. In warm engine (closed loop) operation, the port solenoid is de-energized and converter solenoid is energized. This forces airflow to the converter. In the divert mode, both solenoids are de-energized and airflow is allowed to vent to atmosphere.
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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