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Home >> Cadillac >> 1990 >> Allante F7/ME9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> ECM DTC EO42: Left O2 Sensor Lean >> Test Conditions
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Test Conditions

  1. Codes EO14, EO15, EO16, EO21, EO22, EO26, EO27, EO31, EO32, and EO34 NOT set.
  2. Throttle switch open.
  3. TPS between 6° and 30°.
  4. Coolant temp 58°C or greater.
  5. Oxygen Sensor ready.
  6. RPM 800 or greater.
  7. Canister purge has purged at full duty cycle for 10 minutes since the engine was running with coolant 80°C and TPS 10° or greater.
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