Engine Controls - Tests W/Codes

• Introduction
• Self-Diagnostic System
  • Hard Failures
  • Intermittent Failures
  • Check Engine Light Reset Procedure
    • Federal Models
  • Retrieving Codes
  • Clearing Trouble Codes
  • ECM Locations
• Summary
• Diagnostic Trouble Code Definitions
• Diagnostic Flow Charts
  • Initial Diagnostic Procedure
  • Chart A1 - ECM Power Supply & Ground Circuit Check
  • Chart A2 - Check Engine Light Inoperative
  • Chart A3 - Check Engine Light Stays On Steady (CALIF.)
  • Chart A3 - Check Engine Light Stays On Steady (Federal)
• Diagnostic Code Charts
  • Code 13 - Oxygen Sensor Circuit
  • Code 14 - Coolant Temperature Sensor (Cts) Indication Low
  • Code 15 - Coolant Temperature Sensor (Cts) Indication High
  • Code 21 - Throttle Position Sensor Circuit Indication High
  • Code 22 - Throttle Position Sensor Circuit Indication Low
  • Code 23 - Air Temperature Sensor (ATS) Circuit Indication Low
  • Code 24 - Vehicle Speed Sensor
  • Code 25 - Air Temp Sensor (ATS) Circuit Indication High
  • Code 31 - Pressure Sensor (PS) Circuit Voltage High
  • Code 32 - Pressure Sensor (PS) Circuit Voltage Low
  • Code 41 - No Ignition Signal
  • Code 42 - Crank Angle Sensor
  • Code 44 - Idle Switch Circuit Open Or MISADJUSTED
  • Code 45 - Idle Switch Circuit Shorted Or MISADJUSTED
  • Code 51 - EGR System Circuit Check (CALIF.)
  • Code 53 - ECM Ground Circuit Check (CALIF.)