THM 4T40-E – Automatic Transmission Service Group



THM 4T40-E - Automatic Transmission Service Group PDF

INTRODUCTION THM 4T40-E

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.

INDEX

  • 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
Size: 5.72 Mb
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