TCM Inputs That Affect the 4HP 16 Transaxle

TCM Inputs That Affect the 4HP 16 Transaxle
Throttle Position Sensor
^ Provides throttle position data to the TCM for determining shift patterns and TCC apply/release.
^ An incorrect throttle position sensor input could causes erratic or shift pattern, poor shift quality or TCC function.

Automatic Transaxle Output (Shaft) Speed Sensor
^ Provides vehicle speed data to the TCM for determining shift patterns and TCC apply/release, and gear ratio calculations.
^ An incorrect throttle position sensor input could causes erratic or shift pattern, poor shift quality or TCC function.

Automatic Transaxle Input (Shaft) Speed Sensor
^ Provides transaxle input speed data to the TCM for determining shift patterns and TCC apply/release, and gear ratio.

Engine Coolant Temperature Sensor
^ Provides coolant temperature data to the TCM for determining initial TCC engagement.
^ An incorrect engine coolant temperature sensor input could causes an incorrect initial TCC apply.

Engine Speed
^ The ignition module provides engine speed data the TCM.
^ The TCM uses engine speed information for controlling wide open throttle shifts and the TCC PWM solenoid duty cycle.

Stoplamp Switch
^ Provides brake apply information to the TCM for controlling TCC apply and release.
^ An incorrect TCC stoplamp switch input could causes an incorrect TCC apply or release.

Transaxle Fluid Temperature (TFT) Sensor
^ Provides transaxle fluid temperature information to the TCM for determining alternate shift patterns and TCC apply during high temperature conditions (hot mode operation).
^ An incorrect transaxle temperature sensor input could causes altered shift patterns, poor shift quality and incorrect TCC apply.