Engine Controls - Tests W/Codes

• Introduction
  • Notes
  • Self-Diagnostic System
    • Hard Failures
    • Intermittent Failures
  • Retrieving Codes
  • Notes On Codes
  • Clearing Codes
  • Ecu Location
• Summary
• Trouble Code Identification Charts
• Diagnostic Code Charts
  • Notes
  • Ecu Terminal Identification
  • Diagnostic Circuit Check
  • Test No. 1 - Ecu Power Source
  • Test No. 2 - Ecu (+B) Circuit
  • Code 12, 13 - Rpm Signal
  • Code 14/Test No. 3 - Ignition Signal
  • Code 21/Test No. 4 - Oxygen Sensor Signal
  • Code 22/Test No. 5 - Coolant Temperature Sensor Signal
  • Code 24/Test No. 6 - Intake Air Temperature Sensor Circuit
  • Code 25 - Lean Air/Fuel Mixture
    • Probable Causes:
  • Code 26 - Rich Air/Fuel Mixture
    • Probable Causes:
  • Code 31/Test No. 7 - Vacuum Sensor Signal
  • Code 41/Test No. 8 - Throttle Position Sensor Signal
  • Code 42 - Vehicle Speed Sensor Signal
    • Probable Causes:
  • Code 43/Test No. 9 - Starter Signal
  • Code 51/Test No. 10 - Switch Signal
    • Probable Causes:
  • Code 71/Test No. 11 - EGR System Malfunction
  • Test No. 12 - Injector Circuit
  • Test No. 13 - Check Engine Light Circuit