Description And Operation

DESCRIPTION

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1 - M6 Valve Body Bolt Hole

2- M5 Valve Body to Solenoid Body Bolt Hole

3 - Wiring Harness for Park Release Solenoid

4 - Solenoid A

5 - Solenoid D

6 - Solenoid B

7 - Solenoid E

8 - Solenoid C

9 - Torque Converter Clutch (TCC) Solenoid

10 - Line Pressure Solenoid

11 - Park Release Solenoid

12 - High Impulse Solenoid (HIS) Wire Harness Connector

13 - Output Shaft Speed (OSS) Sensor

14 - Park Hold Solenoid

CAUTION:

The Transmission Control Module (TCM), or Transmission Control Module Assembly (TCMA) is extremely sensitive to Electrostatic Discharge (ESD). Always use a ground strap and follow the ESD guidelines in ELECTROSTATIC DISCHARGE (ESD) SENSITIVE DEVICES. Failure to follow these instructions may result in damage to the TCM/TCMA.

The solenoids are integrated into the Transmission Control Module Assembly (TCMA) of the 8HP transmission and are not replaceable individually.

OPERATION

CAUTION:

The TCM will actuate the valves via solenoids based on the position of the shifter, transmission fluid temperature, engine operating conditions, traction conditions, and driver demands. During a shift, the TCM will actuate the solenoids to match the gear ranges to the optimal torque range of the engine based on the position of the accelerator pedal, shifter, and vehicle speed as determined by the PCM based on input from the Input Speed Sensor (ISS), Output Speed Sensor (OSS) and ABS module.

Solenoids

The EDS solenoid are of two colors to differentiate their characteristic curves:

Blue Solenoid

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Yellow Solenoid

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There are two types of EDS solenoid for regulating the pressure:

The yellow EDS have a rising characteristic curve; there is no control pressure when they are not powered.
The blue EDS have a falling characteristic curve; the maximum control pressure is obtained when the solenoid valves are not powered.