Engine Controls - Tests W/Codes

• Introduction
• Self-Diagnostic System
  • Hard Failures
  • Intermittent Failures
  • Retrieving Trouble Codes
    • Notes
    • Toyota Scan Tester
    • Normal Mode
  • Notes On Trouble Codes
  • Clearing Trouble Codes
  • Trouble Code Detection Driving Pattern Tests
  • ECM Location
• Trouble Code Diagnostic Hints
• Trouble Code Identification
• Trouble Code Charts
  • ECM Terminal Identification
  • Diagnostic Circuit Check
  • Test No. 1 ECM Power Source
  • Test No. 2 - ECM (+B) Circuit Check
  • DTC 12, 13 - Rpm Signal
    • Probable Causes:
    • Procedures:
  • DTC 14 - Ignition Signal
  • DTC 21 - Oxygen Sensor Signal
  • DTC 22 - Engine Coolant Temperature Sensor Signal
  • DTC 24 - Intake Air Temperature Sensor Signal
  • DTC 25, 26 - Lean Or Rich Air/Fuel Mixture
    • Probable Causes:
    • Procedures:
  • DTC 31 - Vacuum Sensor Signal
  • DTC 41 - Throttle Position Sensor Signal
  • DTC 42 - Vehicle Speed Sensor Signal
    • Probable Causes:
    • Procedures:
  • DTC 43 - Starter Signal
  • DTC 51 - Switch Signal
    • Probable Causes:
    • Procedures:
  • DTC 71 - EGR System Malfunction
• Summary