A rich fuel mixture is needed to maintain driveability when the engine is cold. The ECM injects extra fuel based on engine coolant temperature. As the engine coolant warms up, the amount of warm-up enrichment decreases. Depending on the engine, warm-up enrichment will end at approximately 50'C-80'C (122'F-176'F).
If the ECM is in Fail-Safe Mode for DTC PO 115, the ECM substitutes a temperature value, usually 80'C (176'F).
Correction Based on Intake Air Temperature (MAP Sensor Equipped Engines)
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