Engine Controls - Tests W/Codes

• Introduction
  • Notes
  • 1993 Terminology
• Self-Diagnostic System
  • Hard Failures
  • Intermittent Failures
  • Retrieving Codes
    • Normal Mode
    • Test Mode
    • Momentary Interruption Test
  • Diagnostic Trouble Codes
    • Notes
    • MIL Flashes 2 Times Every Second
    • Code 12
    • Code 13
    • Code 14
    • Code 15
    • Code 16
    • Code 21
    • Code 22
    • Code 24
    • Code 25
    • Code 26 (Calif.)
    • Code 27
    • Code 28
    • Code 29
    • Code 31
    • Code 35
    • Code 41
    • Code 42
    • Code 43
    • Code 47
    • Code 48
    • Code 51
    • Code 52
    • Code 53
    • Code 55
    • Code 71
    • Code 78
  • Malfunction Indicator Light (Mil) Does Not Flash
  • Test Preparation
    • SC400
  • Clearing Codes
  • ECM Location
• Trouble Code Identification
• Diagnostic Code Charts
  • Code 12 - Rpm Signal Circuit (No. 1)
  • Code 13 - Rpm Signal Circuit (No. 2)
  • Codes 14 & 15 - Ignition Signal Circuit (LS400)
  • Codes 14 & 15 - Ignition Signal (SC400)
  • Code 16 - A/T Control Signal Malfunction
  • Codes 21 & 28 - Main Oxygen Sensor Signal Left Or Right Bank
  • Code 22 - Engine Coolant Temperature Sensor Circuit
  • Code 24 - Intake Air Temperature Sensor Circuit
  • Codes 25 & 26 - Air/Fuel Ratio Malfunction
  • Codes 27 & 29 - Sub-Oxygen Sensor Circuit (LS400)
  • Codes 27 & 29 - Sub-Oxygen Sensor Circuit (SC400)
  • Code 31 - Airflow Meter Circuit (LS400)
  • Code 31 - Airflow Meter Circuit (SC400)
  • Code 35 - Barometric Pressure Sensor Circuit
  • Codes 41 & 47 - Throttle Position Sensor (TPS) Signal & Sub-Throttle Position Sensor Signal
  • Code 42 - Vehicle Speed Sensor (VSS) Circuit
  • Code 43 - Starter Signal
  • Code 51 - Switch Condition Signal
  • Codes 52, 53 & 55 - No. 1 Knock Sensor Signal, Knock Control Signal & No. 2 Knock Sensor Signal
  • Code 71 - EGR System Malfunction (Ca Only)
  • Code 78 - Fuel Pump Control Circuit
• Summary