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Home >> Chevrolet >> 2008 >> Optra LT, Automatic >> Repair and Diagnosis >> Transmission >> Hydraulic Diagrams >> Automatic Transaxle - ZF 4HP 16 - Service, Overhaul, Removal & Installation, Troubleshooting & Diagnosis >> Transmission Control Module Inputs that Affect the 4HP16 Transmission >> 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.