Engine Controls - Tests W/Codes - SOHC

• Introduction
• Self-Diagnostic System
  • Hard Failures
  • Intermittent Failures
  • Retrieving Codes
  • Clearing Trouble Codes
• ECM Location
• 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 - Won't Flash
• Fault Code Flow Charts
  • Code 13 - Oxygen Sensor Circuit
  • Code 14 - Coolant (Water) Temp Sensor (WTS) Indication Low
  • Code 15 - Coolant (Water) Temp Sensor (WTS) Indication High
  • Code 21 - Throttle Position Sensor Voltage High - A/T
  • Code 22 - Throttle Position Sensor Voltage Low - A/T
  • Code 23 - Air Temp Sensor (ATS) Circuit Indication Low
  • Code 24 - Speed Sensor Circuit Check
  • Code 25 - Air Temp Sensor (ATS) Circuit Indication High
  • Code 31 - Pressure Sensor (PS) Signal Voltage Low
  • Code 32 - Pressure Sensor (PS) Signal Voltage High
  • Code 41 - No Ignition Signal
  • Code 42 - Crank Angle Sensor
  • Code 51 - EGR System Circuit Check - CALIF. Only