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 Tester Only)
  • Clearing Diagnostic Trouble Codes
  • Trouble Code Test Drive Confirmation
  • ECM Location
• Scan Tester Problems
  • DLC3 Inspection
• Circuit Tests
  • Notes
  • DTC P0100 - Mass Airflow (MAF) Sensor Circuit
    • Notes
    • Circuit Description
    • Diagnosis & Repair
  • DTC P0101 - Mass Airflow (MAF) Sensor Circuit Range/Performance Problem
    • 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 Problem
    • 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 Problem
    • Condition
    • Diagnosis & Repair
  • DTC P0125 - Insufficient Coolant Temperature For Closed Loop Fuel Control
    • Notes
    • Circuit Description
    • Diagnosis & Repair
  • DTC P0130 - Heated Oxygen Sensor Circuit (Sensor No. 1)
    • Notes
    • Condition
    • Test Drive Confirmation
    • Diagnosis & Repair Procedure
  • DTC P0133 - Heated Oxygen Sensor Circuit (Sensor No. 1) Slow Response
    • Condition
    • Diagnosis & Repair
  • DTC P0135 - Heated Oxygen Sensor Circuit (Sensor No. 1) DTC P0141 - Heated Oxygen Sensor Circuit (Sensor No. 2)
    • Notes
    • Condition
    • Possible causes are:
    • Diagnosis & Repair
  • DTC P0136 - Heated Oxygen Sensor Circuit (Sensor No. 2)
    • Condition
    • Diagnosis & Repair
  • 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
  • DTCS P0301-P0304 - Cylinders No. 1-4 Misfire Detected
    • Notes
    • Circuit Description
    • Condition
    • Diagnosis & Repair
  • DTC P0325 - Knock Sensor 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 Tester)
    • Diagnosis & Repair (Using OBD-II Scan Tester)
  • DTC P0402 - Excessive Exhaust Gas RECIRCULATION (EGR) Flow Detected
    • Notes
    • Circuit Description
    • Test Drive Confirmation
    • Diagnosis & Repair (Using Toyota Scan Tester)
    • Diagnosis & Repair (Using OBD-II Scan Tester)
  • DTC P0420 - Catalyst System Efficiency Below Threshold
    • Circuit Description
    • Diagnosis & Repair
  • DTC P0441 - Evaporative Emission Control System, Incorrect Purge Flow
    • Notes
    • Circuit Description
    • Diagnosis & Repair (Using Toyota Scan Tester)
    • Diagnosis & Repair (Using OBD-II Scan Tester)
  • 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 P0510 - Closed Throttle Position (CTP) Switch Malfunction
    • Notes
    • Circuit Description
    • Diagnosis & Repair (Using Toyota Scan Tester)
    • Diagnosis & Repair (Using OBD-II Scan Tester)
  • DTC P1300 - Igniter Circuit Malfunction
    • Notes
    • Circuit Description
    • Diagnosis & Repair
  • DTC P1335 - Crankshaft Position (CKP) Sensor Circuit
  • DTC P1500 - Starter Signal Circuit Malfunction
    • Notes
    • Circuit Description
    • Diagnosis & Repair
  • DTC P1510 - Boost Pressure Control Circuit Malfunction
    • Notes
    • Circuit Description
    • Diagnosis & Repair (Using Toyota Scan Tester)
    • Diagnosis & Repair (Using OBD-II Scan Tester)
  • DTC P1600 - ECM Batt Malfunction
    • Notes
    • Circuit Description
    • Diagnosis & Repair
  • DTC P1605 - Knock Control CPU Malfunction
    • Notes
    • Circuit Description
    • Diagnosis & Repair
  • DTC P1780 - Park/Neutral Position (PNP) Switch
    • Notes
    • Circuit Description
    • Possible causes are:
    • Diagnosis & Repair