Page 51 - Hydra-matic 6 Speed RWD Technician's Guide (October 2005)

ELECTRICAL COMPONENTS

Control Solenoid (w Body and TCM) Valve Assembly (314)

FILTER PLATE
ASSEMBLY
(311) SHIFT
SHIFT SOLENOID 2
SOLENOID 1

TRANSMISSION FLUID
TEMPERATURE SENSOR LEAD
FRAME
16 PIN
LINE CONNECTOR
PRESSURE
CONTROL
SOLENOID

PRESSURE
CONTROL
SOLENOID 4

TFP
SWITCH 4
TFP
SWITCH 1
TFP
SWITCH 3

TFP
SWITCH 5
PRESSURE PRESSURE
CONTROL TCC PRESSURE PRESSURE CONTROL
SOLENOID 5 CONTROL CONTROL SOLENOID 3
SOLENOID SOLENOID 2

The control solenoid (w/body and TCM) valve assembly bolts (311). In addition to the components shown above, there are
directly to the lower and upper valve body assemblies inside the two temperature sensors located inside the TCM that are not
transmission. The solenoid valve assembly utilizes a lead frame shown, the TCM Temperature Sensor and the Power Up
system to connect the components to the TCM. There are no Temperature Sensor.
wires used for these components. The solenoid valve assembly
connects to the engine harness 16-way connector via a pass-thru The above components are diagnosed separately, but are serviced
sleeve. All fluid passages to the switches and solenoids are as an assembly.
protected from debris by a serviceable filter plate assembly

Automatic Transmission Fluid Temperature (TFT) Sensor:
RESISTOR
The TFT sensor is part of the control solenoid (w/body and
TCM) valve assembly and is not serviced separately. The TFT
sensor is a resistor, or thermistor, which changes value based on
temperature. The sensor has a negative-temperature coefficient.
This means that as the temperature increases, the resistance
decreases, and as the temperature decreases, the resistance
increases. The TCM supplies a voltage reference signal to the
sensor and measures the voltage drop in the circuit. When the
transmission fluid is cold, the sensor resistance is high and the
TCM detects high signal voltage. As the fluid temperature
warms to a normal operating temperature, the resistance becomes
less and the signal voltage decreases. The TCM uses this
information to maintain shift quality and torque converter clutch
apply quality over operating temperature range.

CONTROL SOLENOID
(W/BODY AND TCM) If the TCM detects an improper signal from the TFT sensor,
VALVE ASSEMBLY a DTC will be activated.
(314)

42 Figure 38