EGT Sensors

🧠 Part of the TuningBot ECU Knowledge Base — in-depth documentation on ECU logic, maps, emissions systems and safe calibration methods.

Exhaust Gas Temperature (EGT) sensors monitor exhaust heat at various points in the exhaust system. The ECU uses EGT data for turbo protection, DPF regeneration control, and thermal management strategies.

Panoramica

Modern diesels have multiple EGT sensors: pre-turbo, post-turbo, pre-DPF, and post-DPF. Each serves specific monitoring and control functions.

Sensor Locations

  • Pre-turbo — turbo protection, maximum EGT monitoring
  • Post-turbo — DOC inlet temperature
  • Pre-DPF — regeneration control
  • Post-DPF — regeneration verification
  • Pre-SCR — catalyst activation temperature

ECU Usage

  • Turbo thermal protection
  • DPF regeneration control
  • SCR activation monitoring
  • Component protection strategies
  • EGT model validation

Calibration Considerations

  • EGT limits should match turbo/exhaust capability
  • Performance tuning increases EGT — monitor closely
  • Sensor accuracy degrades over time

Diagnostica

  • EGT sensor range/performance faults
  • Implausible temperature readings
  • Sensor correlation errors

Best Practices

  • Data log EGT during performance testing
  • Keep pre-turbo EGT below 850-950°C for most turbos
  • Replace sensors if readings become erratic

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