THM 4T40-E – ATSG (Automatic Transmission Service Group)

THM

This Manual contains general description and the procedures necessary to repair, service, or overhaul the THM 4T40-E electronic overdrive automatic transaxle. This unit was first introduced in the 1995 Chevrolet Cavalier and Pontiac Sunfire vehicles, and will eventually replace the THM 125C (3T40).

The THM 4T40-E is a fully automatic front wheel drive transaxle. It provides park, reverse, neutral, and 4 forward speeds including overdrive. The shift pattern is controlled electronically with 2 shift solenoids that recieve a ground signal from the Powertrain Control Module (PCM). The PCM will vary shift points, as it is constantly interpreting numerous electronic signals from various operational sensore located on the vehicle.

The PCM also controls apply and release of the Torque Converter Clutch. Line pressure and shift feel are also controlled electronically with a Pressure Control Solenoid (PCS) located on the valve body and is dependant on TPS and VSS signals.

RANGE REFERENCE CHART
FLUID CHECKING PROCEDURE
LINE PRESSURE TEST
TROUBLE CODE RETRIEVAL AND PCM LOCATION
TROUBLE CODE CHART AND DESCRIPTION
ELECTRONIC COMPONENTS AND DESCRIPTION
INTERNAL WIRE HARNESS SCHEMATIC
ELECTRONIC COMPONENT RESISTANCE CHART
DIAGNOSTIC CHARTS
TCC SHUDDER DIAGNOSIS
OIL PASSAGE IDENTIFICATION
CHECKBALL LOCATIONS IN CHANNEL PLATE
TRANSAXLE DISASSEMBLY
COMPONENT REPAIR AND TRANSAXLE ASSEMBLY
FORWARD CLUTCH HOUSING ASSEMBLY
DIRECT/COAST CLUTCH HOUSING ASSEMBLY
SELECTIVE THRUST WASHER MEASUREMENT
REVERSE INPUT CLUTCH AND 2ND ROLLER CLUTCH
INPUT SPEED SENSOR ASSEMBLY
VALVE BODY ASSEMBLY
PRESSURE SWITCH ASSEMBLY TEST PROCEDURE (OFF UNIT)
BEARING AND WASHER LOCATION CHART
TORQUE SPECIFICATIONS
SPECIAL TOOLS
“UPDATE SECTION”

Language: English
Format: PDF
Pages: 128

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THM 4T40-E – ATSG (Automatic Transmission Service Group)

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