Engine Controls - Tests W/Codes - Except OBD-II

• Introduction
• Self-Diagnostic System
  • Hard Failures
  • Intermittent Failures
  • Retrieving Codes
    • Notes
    • Lexus Scan Tester
    • Normal Mode
    • Test Mode
    • Momentary Interruption Test
  • Notes On Trouble Codes
  • Malfunction Indicator Light (Mil) Does Not Flash
  • Test Preparation
  • Clearing Codes
  • Trouble Code Detection Driving Pattern Test
  • ECM Location
  • Diagnostic Trouble Code Definitions
• Trouble Code Identification
• Diagnostic Code Charts
  • Notes
  • Code 12 - Rpm Signal Circuit
  • Code 13 - Rpm Signal Circuit
  • Code 14 - Ignition Signal Circuit
  • Code 16 - ECT Control Signal Malfunction
  • Code 21 - Main O2 Sensor CKT (Front Sensor)
  • Code 28 - Main O2 Sensor CKT (Rear Sensor)
  • Code 22 - Engine Coolant Temperature Sensor Circuit
  • Code 24 - Intake Air Temperature Sensor Circuit
  • Code 25 - Air/Fuel Ratio Malfunction (Lean)
  • Code 26 - Air/Fuel Ratio Malfunction (Rich)
  • Code 27 - Sub-Oxygen Sensor Circuit (CALIF.)
  • Code 31 - Low Airflow Meter Voltage
  • Code 35 - Barometric Pressure Sensor Circuit
  • Code 41 - TPS Signal
  • Code 47 - Sub-TPS Signal
  • Code 42 - Vehicle Speed Sensor (VSS) Signal Circuit
  • Code 43 - Starter Signal
  • Code 51 - Switch Condition Signal
  • Codes 52, 53 & 55 - Knock Sensor Circuit
  • Code 71 - EGR System Malfunction
  • Code 78 - Fuel Pump Control Circuit
• Summary
• Wiring Diagrams