10-11-2015, 04:45 PM
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Registered User
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Join Date: May 2009
Location: The slums of Beverly Hills
Posts: 8,065
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Quote:
The Exhaust Gas Recirculation (EGR) system is controlled by a vacuum solenoid. The solenoid is supplied ignition voltage. The Powertrain Control Module (PCM) controls the vacuum solenoid by grounding the control circuit(ground) or driver The primary function of the driver is to supply ground for the object that is being controlled. Each driver has a fault circuit that the PCM monitors. When the PCM turns a component on, the control circuit voltage is low, or close to zero. When the component is turned off, the voltage on the control circuit is high, or near battery voltage. The PCM watches for these conditions, and if it doesn\'t see the proper voltage at the proper time, this code is set.
Read more at: OBD-II Trouble Code: P0403 Exhaust Gas Recirculation Circuit Malfunction
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Check the electric plug for the vacuum actuator.
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