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Home >> Chevrolet >> 2007 >> Optra LS, Standard >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Automatic Transaxle - ZF 4HP 16 - Troubleshooting And Service >> Transmission Control Module Inputs that Affect the 4HP16 Transaxle >> Engine Speed

Engine Speed

The ignition module provides engine speed data for the TCM.

The TCM uses engine speed information for controlling wide open throttle shifts and the TCC/pulse width modulation (PWM) solenoid duty cycle.