Transmission Control Module (4-Speed A/T)
Transmission Control Module (TCM) provides input signal to Powertrain Control Module (PCM) to indicate vehicle speed. TCM calculates vehicle speed based upon input signal from output speed sensor and speedometer pinion factor.
The PCM uses input signal along with TP sensor closed throttle input signal to determine if a closed throttle deceleration or normal idle condition exists. During deceleration, PCM controls Idle Air Control (IAC) motor to maintain a desired MAP value. During idle conditions, PCM controls IAC motor to maintain a desired idle speed. The TCM is located on passenger's side front corner of engine compartment, on inner fender, near windshield washer reservoir. See Fig 1 .