Section 15 · Pages 263–290 (28 pages)

Computer Command Control (Without Using Scan Tool Diagnosis)

From the 1988 GMC Light Duty Truck Fuel, Emissions and Driveability Manual

Diagnosis of the Computer Command Control system without a Scan tool, using voltmeter checks at the connector terminals: general description of the fuel module, coolant temperature, oxygen, MAP and MAT sensors, then trouble code charts such as code 34 and code 42, oxygen sensor circuit checks and faulty ECM procedures.

Read this section free, starting at page 263

What this section covers

  • Sensor descriptions
  • Grounding the diagnostic terminal
  • Trouble code charts
  • Oxygen sensor circuit
  • MAP and MAT sensors
  • Faulty ECM
Year
1988
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
R/V, G, P, S/T, M, C/K 10–30
Publication
X-8836
Pages
290

What’s inside

Front matter

  1. Foreword and ContentsForeword listing the engines covered and the service manuals this book supplements, metric fastener cautions, the action symbols used in the procedures, and the table of contents.pp. 3–6

Manual

  1. 1General Informationpp. 7–24
  2. 2Driveability Symptomspp. 25–30
  3. 3Computer Command Control (Using Scan Tool Diagnosis)pp. 31–148
  4. 4Fuel Control Systempp. 149–192
  5. 5Evaporative Emission Control System (EECS)pp. 193–198
  6. 6Ignition System/ESTpp. 199–206
  7. 7Electronic Spark Control (ESC)pp. 207–210
  8. 8Air Management Systempp. 211–220
  9. 9Exhaust Gas Recirculation (EGR) Systempp. 221–230
  10. 10Automatic and Manual Transmission Controlspp. 231–240
  11. 11Positive Crankcase Ventilation (PCV)pp. 241–244
  12. 12Thermostatic Air Cleaner (THERMAC)pp. 245–250
  13. 13Special Toolspp. 251–258
  14. 14Abbreviations and Glossary of Termspp. 259–262
  15. 15Computer Command Control (Without Using Scan Tool Diagnosis)pp. 263–290

Other manuals for this vehicle