Page 48 - Hydra-matic 6 Speed RWD Technician's Guide (October 2005)

ELECTRICAL COMPONENTS

The Hydra-matic 6 Speed RWD transmission incorpo- type of control provides consistent and precise shift
rates electronic controls that utilize the transmission points and shift quality based on the operating con-
control module (TCM) to control shift points (through ditions of the vehicle.
shift solenoids and pressure control solenoids), torque
converter clutch (TCC) apply and release [through the Adaptive shift control technology enables the TCM
torque converter clutch pressure control (TCC PC) so- to continually monitor and compare shift performance
lenoid] and line pressure [through the pressure control to the "optimum" shift, and make adjustments to the
(PC) solenoid]. In the 6 Speed RWD transmission, the factory settings to continually deliver excellent shift
TCM and all of the shift solenoids, PC solenoids, TFT quality.
sensor and fluid pressure switches are contained in one
unit, the control solenoid (w/body and TCM) valve If for any reason the entire electronic control system
assembly (314). Electrical signals from various sen- of the transmission, or one of the electrical compo-
sors provide information to the TCM about vehicle nents within the control solenoid (w body and TCM)
speed, throttle position, engine coolant temperature, valve assembly becomes disabled, the transmission
transmission fluid temperature, gear range selector po- will default to protection mode. If the transmission is
sition, engine speed, converter turbine speed, engine in 1st, 2nd or 3rd gear during an electrical failure,
load braking and operating mode. The TCM uses this the transmission will default to 3rd gear. If the trans-
information to determine the precise moment to up- mission is in 4th, 5th or 6th gear during an electrical
shift or downshift, apply or release the TCC, and what failure, the transmission will default to 5th gear.
fluid pressure is needed to apply the clutches. This

A B C TCM SERIAL DATA DLC ECM CAN BUS N BCM

D E F G H I J K L M
INPUTS OUTPUTS
INFORMATION SENSORS ELECTRONIC CONTROLLERS ELECTRONICALLY CONTROLLED
A. THROTTLE POSITION (TP) SENSOR TRANSMISSION COMPONENTS
B. MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR TRANSMISSION CONTROL LINE PRESSURE CONTROL SOLENOID
MODULE (TCM)
C. ENGINE SPEED SENSOR
D. MANIFOLD AIR TEMPERATURE (MAT) SENSOR ENGINE CONTROL MODULE (ECM) PRESSURE CONTROL SOLENOID 2
E. ENGINE COOLANT TEMPERATURE (ECT) SENSOR
PRESSURE CONTROL SOLENOID 3
F. TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR BODY CONTROL MODULE (BCM)
G. TRANSMISSION MANUAL SHIFT PRESSURE CONTROL SOLENOID 4
SHAFT POSITION SWITCH ASSEMBLY ELECTRONIC BRAKE AND TRACTION
H. TRANSMISSION INPUT SPEED SENSOR (A/T ISS) CONTROL MODULE (EBTCM) PRESSURE CONTROL SOLENOID 5
I. TRANSMISSION FLUID PRESSURE SWITCHES (NOT SHOWN) TORQUE CONVERTER CLUTCH (TCC)
J. TRANSMISSION OUTPUT SPEED SENSOR (A/T OSS) DIAGNOSTIC LINK CONNECTOR PRESSURE CONTROL (PC) SOLENOID
K. ACCELERATOR PEDAL POSITION (APP) SENSOR (DLC)
L. BRAKE SWITCH SHIFT SOLENOID (SS) 1
M. DRIVER SHIFT CONTROL (DSC) SWITCHES
N. OPERATING MODE SELECTION SWITCHES SHIFT SOLENOID (SS) 2

Figure 35 39