Engine Control System Tests W/Codes

• Introduction
  • Notes
  • System Overview
  • Two-Trip Detection Logic
  • Data Link Connector
  • Freeze-Frame Data
• Self-Diagnostic System
  • Malfunction Indicator Light (Mil) Inspection
  • Testing Procedure
  • Retrieving Diagnostic Trouble Codes
    • Notes
    • NORMAL Mode Code Retrieval
    • CHECK Mode Code Retrieval (Toyota Scan Tool Only)
  • Clearing Diagnostic Trouble Codes
  • Trouble Code Test Drive Confirmation
  • ECM Location
• Scan Tool Problems
  • DLC No. 3 Inspection
• Summary
• Circuit Tests
  • Notes
  • DTC P0100: Mass Airflow (MAF) Sensor Circuit
    • Notes
    • Circuit Description
    • Diagnosis & Repair
  • DTC P0101: Mass Airflow (MAF) Sensor Circuit Range/Performance Malfunction
    • Condition
    • Diagnosis & Repair Procedure
  • DTC P0110: Intake Air Temperature (IAT) Sensor Circuit
    • Notes
    • Circuit Description
    • Diagnosis & Repair
  • DTC P0115: Engine Coolant Temperature (ECT) Sensor Circuit
    • Notes
    • Circuit Description
    • Diagnosis & Repair
  • DTC P0116: Engine Coolant Temperature (ECT) Sensor Circuit Range/Performance Malfunction
    • Condition
    • Diagnosis & Repair
  • DTC P0120: Throttle Position (TP) Sensor Circuit Malfunction
    • Notes
    • Circuit Description
    • Diagnosis & Repair
  • DTC P0121: Throttle Position (TP) Sensor Circuit Range/Performance Malfunction
    • Condition
    • Diagnosis & Repair
  • DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control
    • Notes
    • Circuit Description
    • Diagnosis & Repair
  • DTC P0130: Heated Oxygen Sensor Fault (Bank No. 1, Sensor No. 1), DTC P0150: Heated Oxygen Sensor Fault (Bank No. 2, Sensor No. 1)
    • Notes
    • Condition
    • Test Drive Confirmation
    • Diagnosis & Repair Procedure
  • DTC P0133: Heated Oxygen Sensor (Bank No. 1, Sensor No. 1) Circuit Slow Response, DTC P0153: Heated Oxygen Sensor (Bank No. 2, Sensor No. 1) Circuit Slow Response
    • Notes
    • Condition
    • Diagnosis & Repair
  • DTC P0135: Heated Oxygen Sensor Circuit (Bank No. 1, Sensor No. 1), DTC P0141: Heated Oxygen Sensor Circuit (Bank No. 1, Sensor No. 2), DTC P0155: Heated Oxygen Sensor Circuit (Bank No. 2, Sensor No. 1)
    • Notes
    • Condition
    • Diagnosis & Repair
  • DTC P0136: Heated Oxygen Sensor Circuit (Bank No. 1, Sensor No. 2)
    • Notes
    • Condition
    • Diagnosis & Repair
  • DTC P0141: Heated Oxygen Sensor Circuit (Bank No. 1, Sensor No. 2)
    • Diagnosis & Repair
  • DTC P0150: Heated Oxygen Sensor Circuit (Bank No. 2, Sensor No. 1)
    • Diagnosis & Repair
  • DTC P0153: Heated Oxygen Sensor Circuit (Bank No. 2, Sensor No. 1) Slow Response
    • Diagnosis & Repair
  • DTC P0155: Heated Oxygen Sensor Circuit (Bank No. 2, Sensor No. 1)
  • DTC P0171: System Too Lean (Fuel Trim), DTC P0172: System Too Rich (Fuel Trim)
    • Notes
    • Circuit Description
    • Diagnosis & Repair
  • DTC P0300: Random Misfire Detected
    • Circuit Description
    • Diagnosis & Repair
  • DTC P0301: Cylinder No. 1 Misfire Detected, DTC P0302: Cylinder No. 2 Misfire Detected, DTC P0303: Cylinder No. 3 Misfire Detected, DTC P0304: Cylinder No. 4 Misfire Detected, DTC P0305: Cylinder No. 5 Misfire Detected, DTC P0306: Cylinder No. 6 Misfire Detected
    • Notes
    • Circuit Description
    • Condition
    • Diagnosis & Repair
  • DTC P0325: Knock Sensor No. 1 Circuit, DTC P0330: Knock Sensor No. 2 Circuit
    • Notes
    • Circuit Description
    • Diagnosis & Repair
  • DTC P0335 Or P1335: Crankshaft Position (CKP) Sensor Circuit
    • Notes
    • Circuit Description
    • Diagnosis & Repair
  • DTC P0340: Camshaft Position (CMP) Sensor Circuit
    • Notes
    • Circuit Description
    • Diagnosis & Repair
  • DTC P0401: Insufficient Exhaust Gas RECIRCULATION (EGR) Flow Detected
    • Notes
    • Circuit Description
    • Test Drive Confirmation
    • Diagnosis & Repair (Using Toyota Scan Tool)
    • Diagnosis & Repair (Using OBD-II Scan Tool)
  • DTC P0402: Excessive Exhaust Gas RECIRCULATION (EGR) Flow Detected
    • Notes
    • Circuit Description
    • Test Drive Confirmation
    • Diagnosis & Repair (Using Toyota Scan Tool)
    • Diagnosis & Repair (Using OBD-II Scan Tool)
  • DTC P0420: Catalyst System Efficiency Below Threshold
    • Notes
    • Circuit Description
    • Diagnosis & Repair
  • DTC P0440: Evaporative Emission Control System Malfunction
    • Notes
    • Circuit Description
    • Diagnosis & Repair
  • DTC P0441: Incorrect EVAP Purge Flow DTC P0446: Vent Control Malfunction
    • Notes
    • Circuit Description
    • Diagnosis & Repair (Using Toyota Scan Tool)
    • Diagnosis & Repair (Using OBD-II Scan Tool)
  • DTC P0450: EVAP Pressure Sensor Malfunction
    • Notes
    • Circuit Description
    • Diagnosis & Repair
  • DTC P0500: Vehicle Speed Sensor Malfunction
    • Notes
    • Circuit Description
    • Diagnosis & Repair
  • DTC P0505: Idle Air Control (IAC) System Malfunction
    • Notes
    • Circuit Description
    • Repair & Diagnosis
  • DTC P1300: IGNITOR Circuit Malfunction
    • Notes
    • Circuit Description
    • Diagnosis & Repair
  • DTC P1335: Crankshaft Position (CKP) Sensor Circuit
  • DTC P1410: EGR Valve Position Sensor Circuit Malfunction
    • Notes
    • Circuit Description
    • Diagnosis & Repair
  • DTC P1411: EGR Valve Position Sensor Circuit Range/Performance
    • Notes
    • Circuit Description
    • Diagnosis & Repair
  • DTC P1520: Stoplight Switch Signal Malfunction (A/T Only)
    • Notes
    • Circuit Description
    • Diagnosis & Repair
  • DTC P1600: ECM Batt Malfunction
    • Notes
    • Circuit Description
    • Diagnosis & Repair
  • DTC P1780: Park/Neutral Position (PNP) Switch
    • Notes
    • Circuit Description
    • Diagnosis & Repair