Engine Running After Start Injection Duration Control

Total fuel injection duration is determined in three basic steps:

• Basic injection duration.

• Injection corrections.

• Voltage correction.

Basic injection duration is based on air volume and engine RPM. Air volume on MAF equipped engines is determined by the MAF voltage signal.

On MAP sensor equipped engines, the ECM calculates air volume based on the PIM signal, engine RPM, THA signal, and volumetric efficiency values stored in the ECM.

Injection corrections adjust the basic injection duration to accommodate different engine modes and operating conditions. It is based on a variety of input signals.

Voltage correction adjusts the injection duration to compensate for differences in the electrical system voltage.

After Start Enrichment & Warm

Up Correction |

Coolant Temperature °C (°F) *Depending On The Engine Model


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