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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN PASSENGER EXTENDED, 5.0 MREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 210 (ENGINE CONTROLS - THEORY & OPERATION - 3.4L)EMISSION SYSTEMS & SUB-SYSTEMSEXHAUST GAS RECIRCULATION POSITION SENSORLINEAR EGR CONTROL
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 M

Linear EGR Control

2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 MSECTION Linear EGR Control
WARNING: This page is about a different car, the 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, 2003 Chevrolet Monte Carlo, and 2003 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.

The linear EGR valve is controlled by a high side driver within the PCM. The high side driver provides 12 volts that is Pulse Width Modulated (PWM) by a duty cycle via the high control circuit of the EGR valve. The ground path is provided by the low control circuit of the EGR valve. The PCM calculates the amount of EGR needed based on the following inputs:

  • The Engine Coolant Temperature (ECT) sensor.
  • The Intake Air Temperature (IAT) sensor.
  • The Barometric Pressure (BARO).
  • The Manifold Absolute Pressure (MAP) sensor.
  • The Throttle Position (TP) sensor.
  • The Mass Air Flow (MAF) sensor.

RENDER: 1.0x

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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  • • 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.