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Home >> Cadillac >> 2003 >> CTS Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Self-Diagnostic System >> On-Board Diagnostics >> Monitors

On-Board Diagnostics: Monitors

  1. Comprehensive Component Monitor

    Monitors ECM systems for opens, shorts, grounds and out-of-range sensors. Also monitors rationality of sensors. Rationality is whether the sensor's value is consistent with operating conditions of the other sensors.

  2. Misfire Monitor

    Monitors engine misfire using crankshaft sensor to determine location and severity of misfire. A catalyst damaging misfire will flash the MIL, and a non-catalyst damaging misfire is a normal Type "B" code.

  3. Fuel Trim Monitor

    Monitors short and long term fuel trim for being at maximum lean or rich limit.

  4. Oxygen Sensor Monitor

    Monitors all oxygen sensors for maximum voltage level, minimum voltage level and lean rich/rich lean switching rate.

  5. Oxygen Sensor Heater Monitor

    Monitors oxygen sensor heater by watching sensor's time-to-activity after a cold start.

  6. Catalyst Monitor

    Monitors catalyst efficiency by comparing activity rate of pre-catalyst oxygen sensor and post-catalyst oxygen sensor.

  7. EVAP Monitor

    Monitors EVAP system for large leaks, small leaks and purge flow.
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