Circuit Description

A linear Exhaust Gas Recirculation (EGR) valve is used on this system. Powertrain Control Module (PCM) commands EGR valve to operate when necessary by controlling a ground signal through PCM. This can be monitored on a scan tool by selecting DESIRED EGR POSITION function. Ignition voltage is supplied to EGR valve thorough a fuse. PCM monitors results of its command through a feedback signal. Feedback signal is the actual position of the EGR pintle. This feedback signal can also be monitored on a scan tool by selecting ACTUAL EGR POSITION function. The ACTUAL EGR POSITION should always be near the commanded or DESIRED EGR POSITION.

Conditions for setting this DTC are as follows:

• Engine speed is 1000-2200 RPM.
• Engine coolant temperature is greater than 176°F (80°C).
• Barometric Pressure (BARO) is greater than 60 kPa.
• Manifold Absolute Pressure (MAP) is 13-32 kPa.
• Idle Air Control (IAC) has not changed greater than 4 counts.
• TP angle is less than one percent.
• No presence of Codes: P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0121-P0123, P0125, P0300-P0304, P0335, P0440, P0442, P0446, P0502, P0503, P0506, P0507, P1441.
• Vehicle speed is less than 20 MPH.
• Decel Exponentially Weighted Moving Average (EWMA) is greater than +2 kPa.Z