Section 10 · Pages 353–360 (8 pages)

Automatic and Manual Transmission Controls

From the 1991 GMC Light Duty Truck Fuel, Emissions and Driveability Manual

The torque converter clutch (TCC) system on the Hydramatic 4L60, with its brake switch, 4-3 downshift pulse switch and vehicle speed sensor, TCC electrical diagnosis for 2.5L, 2.8L, 4.3L and V8 engines, and the manual transmission shift light.

Read this section free, starting at page 353

What this section covers

  • TCC system operation
  • Brake switch and pulse switch
  • TCC electrical diagnosis
  • Manual transmission shift light
Year
1991
Make
GMC
Vehicle
C/K Trucks, G Vans, Light Duty Trucks, M Vans (Astro/Safari), P Forward Control, R/V Trucks, S/T Trucks, Trucks
Type
Fuel & Emissions, Supplement
Models
C/K, R/V, P, G, S/T, M 10–30
Publication
X-9136
Pages
406

What’s inside

Fuel and emissions manual

  1. 1General Informationpp. 7–24
  2. 2Driveability Symptomspp. 25–44
  3. 3Computer Command Control (Scan Tool Diagnosis)pp. 45–254
  4. 4Fuel Control System (TBI 220 and 700)pp. 255–300
  5. 5Evaporative Emission Control System (EECS)pp. 301–308
  6. 6Ignition System and ESTpp. 309–318
  7. 7Electronic Spark Control (ESC)pp. 319–326
  8. 8Air Management Systempp. 327–336
  9. 9Exhaust Gas Recirculation (EGR) Systempp. 337–352
  10. 10Automatic and Manual Transmission Controlspp. 353–360
  11. 11Positive Crankcase Ventilation (PCV)pp. 361–366
  12. 12Thermostatic Air Cleaner (THERMAC)pp. 367–372
  13. 13Special Toolspp. 373–380
  14. 14Abbreviations and Glossary of Termspp. 381–384
  15. IndexAlphabetical index of subjects with section and page references.pp. 385–406

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