TRANSMISSION DETAILS: VALVE BODY COMPONENTS

Valve body electrical components consist of:
Pressure Regulator solenoids (EDS). Controlled by a Pulse Width Modulated (PWM) control signal from the TCM provides an adjustable positioning of the valve. The variable position makes these valves suitable for varying control pressures. Pressure Regulator valves are used for:
» Maintaining operating pressures
» Gradual TC Clutch lock up control
» Overlap shift control (system specific)
» Band Brake Activation (system specific)
Magnetic Valve (Shift) Solenoids (MV). Controlled by a switched (on/off)power or ground signal from the TCM. The valves have two positions open or closed.
Some are normally open and close when activated and some are normally closed and open when activated.
MV solenoids are for:
» Controlling shift valve position
» ON/OFF control of TC lock up clutch
» Reverse Lock Out protection (early systems)
» Band Brake Activation (system specific)
» Shift lock control

Input (Turbine) and output Speed Sensors. Analog inductive sensors
that produce an A/C sine wave similar to an ABS/ASC wheel speed sensor.
The signal frequency is proportional to the rotation speed of the monitored component.
The speed sensors are used to monitor clutch slip for plausibility and shift points as well as maintaining adaptive hydraulic pressures.
Transmission Oil Temperature Sensor: NTC resistor provides a variable voltage drop proportional to transmission oil temperature.
For most systems,the NTC is soldered into the oil temp circuit of the wiring harness located in the transmission oil sump.
The A5S 360R transmission contains a replaceable NTC plug in resistor probe that is clipped to a bracket and immersed in oil in the sump.
These components are monitored statically and dynamically by the TCM and will set specific fault codes if the sensor or itÕs circuit becomes impaired.
However,the components and their circuits to the TCM can be simultaneously checked during diagnosis.

The following pages provide specific locations of the components within the transmissions.

TRANSMISSION POWERFLOW
The TCM controls the hydraulic valve body by activating specific electrical solenoids and pressure regulators.
The component locations within a transmission in relation to activation of shift components (multi plate clutches and brakes, band brakes, freewheels) control and direct the powerflow through the planetary gearset(s) providing various output ratios.
By design, each transmission manages powerflow uniquely with a common goal of providing progressive output ratios. Visual explanation of a Planetary Gear Set power flow schematics.
At first glance the representation of a transmissions internal components is confusing.
Understanding the powerflow through the transmission is explained by a powerflow schematic.
Powerflow schematics are simple line drawings of the upper half of the transmission showing engine drive torque input, torque converter powerflow, clutches, brakes freewheels and the planetary gearset(s) to output.

The illustrations below will help in understanding the schematics.
Specifications for MV solenoids: Values @ 20° C temperature
MV1 = 25 to 46Ω
MV2 = 25 to 46Ω
MV3 = Converter Lock-up Solenoid 25 to 46Ω

A5S 310/270R
VALVE BODY COMPONENTS
MAIN PRESSURE REGULATOR
RESISTANCE @ 3.5 - 6.0 Ohms
20°C +/- 5°C
RESISTANCE @ 4.0 - 7.0 Ohms
80°C +/- 5°C
SHIFT SOLENOIDS: MV 1 & MV 2
RESISTANCE @ 17.0 - 20.0 Ohms
20°C +/- 5°C
RESISTANCE @ 21.0 - 24.5 Ohms
80°C +/- 5°C
BAND BRAKE REGULATOR
RESISTANCE @ 9.0 - 12.0 Ohms
20°C +/- 5°C
RESISTANCE @ 11.5 - 14.5 Ohms
80°C +/- 5°C

A5S 360R (GM 5)
VALVE BODY COMPONENTS
MAIN PRESSURE REGULATOR
Resistance @: (temperature will affect resistances)(Readings at +/- 7%)
20°C = 4Ω
90°C = 5.2Ω
TORQUE CONVERTER REGULATOR ÐTCC
Resistance @: (temperature will affect resistances)(Readings at +/- 7%)
20°C = 10Ω
90°C = 12.7Ω
NTC TEMP SENSOR
-30°C = 52594Ω
100°C = 178Ω
SHIFT SOLENOIDS: A - B - C
20°C = 16Ω
70° = 19.1Ω
SPEED SENSORS
20°C = 405Ω
Note! Above resistance may vary as much as 15%

A5S 310Z Valve Body Resistance Nominal Values:
Resistances @ 20°C
Output Speed Sensor = 325Ω - +/- 40Ω
Input Speed Sensor = 325Ω - +/- 40Ω
NTC Sensor:
820Ω @ 0°C
962Ω @ 20°C
1118Ω @ 40°C
1289Ω @ 60°C
EDS1 = 5.9Ω - +/- 5Ω
MV1 = 28Ω
MV2 = 28Ω
MV3 = 28Ω
MV4 = 28Ω
MV5 = 28Ω
MV6 = 28Ω
Above MV Solenoid resistance values may vary up to 2Ω, dependant on temperatures!

And the drawings are here, save the file

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