Section 3 · Pages 29–138 (110 pages)

Computer Command Control

From the 1987 GMC Light Duty Truck Fuel, Emissions and Driveability Manual

The Computer Command Control system: the ECM, the ALDL connector and the sensors and signals it reads (coolant temperature, oxygen, MAP, MAT, throttle position, vehicle speed, park/neutral, crank, power steering pressure, distributor reference and A/C signals). It contains the diagnostic and trouble code charts, then on-vehicle service of the wire harness and Micro-Pack, Metri-Pack, Weather-Pack and Compact Three connectors, the ECM, and wiring diagrams for the 2.5L, 2.8L and 4.3L and V8 engines.

Read this section free, starting at page 29

What this section covers

  • ECM inputs and outputs
  • ALDL connector
  • Sensors and switches
  • Diagnostic and trouble code charts
  • Connectors and terminals
  • ECM service
  • Wiring diagrams: 2.5L, 2.8L, 4.3L and V8
Year
1987, 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 10–30; 1988 C/K
Publication
X-8736
Pages
262

What’s inside

Fuel and emissions manual

  1. 1General Informationpp. 7–22
  2. 2Driveability Symptomspp. 23–28
  3. 3Computer Command Controlpp. 29–138
  4. 4Fuel Control (TBI 220 and TBI 700)pp. 139–182
  5. 5Evaporative Emission Control System (EECS)pp. 183–188
  6. 6Ignition System and ESTpp. 189–196
  7. 7Electronic Spark Controlpp. 197–200
  8. 8Air Management Systempp. 201–210
  9. 9Exhaust Gas Recirculation (EGR) Systempp. 211–220
  10. 10Automatic and Manual Transmission Controlspp. 221–230
  11. 11Positive Crankcase Ventilation (PCV)pp. 231–234
  12. 12Thermostatic Air Cleaner (THERMAC)pp. 235–240
  13. 13Special Tools and Specificationspp. 241–248
  14. 14Abbreviations and Glossary of Termspp. 249–252
  15. IndexAlphabetical index of subjects with section and page references, followed by reply cards.pp. 253–262

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