Engine Controls - Self-Diagnostics

• Introduction
• Self-Diagnostic System
  • Malfunction Indicator Light (Mil)
    • Notes
    • Hard Failures
    • Intermittent Failures
  • Retrieving Codes
  • Diagnostic Trouble Code Identification
  • Freeze Frame Data
  • Pcm Reset Procedure/Clearing Codes
• Summary
• Test Equipment
• Connector Identification
• Diagnostic Circuit Check
  • Notes
  • Malfunction Indicator Light (Mil) Malfunction
    • Malfunction Indicator Light (MIL) Never Illuminates
    • Malfunction Indicator Light Stays Illuminated Or Illuminates After 2 Seconds
• Diagnostic Tests
  • DTC P0107: Manifold Absolute Pressure (Map) Sensor Low Input Voltage
  • DTC P0108: Manifold Absolute Pressure (Map) Sensor High Input Voltage
  • DTC P0112: Intake Air Temperature (IAT) Sensor Low Input Voltage
  • DTC P0113: Intake Air Temperature (IAT) Sensor High Input Voltage
  • DTC P0116: Engine Coolant Temperature (ECT) Sensor Range/Performance Problem
  • DTC P0117: Engine Coolant Temperature (ECT) Sensor Low Input Voltage
  • DTC P0118: Engine Coolant Temperature (ECT) Sensor High Input Voltage
  • DTC P0122: Throttle Position (TP) Sensor Low Input Voltage
  • DTC P0123: Throttle Position (TP) Sensor High Input Voltage
  • DTC P0131: Primary Heated Oxygen Sensor (Ho2S-1) Low Voltage
  • DTC P0132: Primary Heated Oxygen Sensor (Ho2S-1) High Voltage
  • DTC P0133: Primary Heated Oxygen Sensor (Ho2S-1) Slow Response
  • DTC P0135 Or P0141: Heated Oxygen Sensor (Ho2S) Heater Circuit Malfunction
  • DTC P0137: Secondary Heated Oxygen Sensor (Ho2S-2) Low Voltage
  • DTC P0138: Secondary Heated Oxygen Sensor (Ho2S-2) High Voltage
  • DTC P0139: Secondary Heated Oxygen Sensor (Ho2S-2) Slow Response
  • DTC P0171 Or P0172: Fuel System Too Lean Or Too Rich
  • DTC P0300 Set With DTC P0301, P0302, P0303 Or P0304: Random Misfire Detected
    • Notes
    • Possible Cause
  • DTC P0301, P0302, P0303 Or P0304: Cylinders No. 1-4 Misfire Detected
  • DTC P0325: Knock Sensor (KS)
  • DTC P0335, P0336, P1361, P1362, P1381 Or P1382: CKP/TDC/CYP Sensor
  • DTC P0420: Catalyst System Efficiency Below Threshold
  • DTC P0452: Fuel Tank Pressure Sensor (Ftps) Low Voltage
  • DTC P0453: Fuel Tank Pressure Sensor (Ftps) High Voltage
  • DTC P0500: Vehicle Speed Sensor (VSS) Circuit Malfunction (Low Input Voltage)
  • DTC P0505: Idle Control System Malfunction
  • DTC P1106: Barometric Pressure (BARO) Circuit Range/Performance
  • DTC P1107 Or P1108: Barometric Pressure (BARO) Sensor Circuit Voltage High/Low
  • DTC P1121: Throttle Position (TP) Lower Than Expected
  • DTC P1122: Throttle Position (TP) Higher Than Expected
  • DTC P1128: Manifold Absolute Pressure (Map) Lower Than Expected
  • DTC P1129: Manifold Absolute Pressure (Map) Higher Than Expected
  • DTC P1259: VTEC Pressure Switch Or Solenoid Valve Circuits
  • DTC P1297: Electrical Load Detector (Eld) Low Voltage Input
  • DTC P1298: Electrical Load Detector (Eld) High Voltage Input
  • DTC P1336 Or P1337: Crankshaft Speed Fluctuation (CKF) Sensor
  • DTC P1359: Crankshaft Position/Top Dead Center/Cylinder Position (CKP/TDC/CYP) Sensor Disconnected
  • DTC P1456 Or P1457: Evaporative Emission Control System (EVAP) Leak Detected
  • DTC P1508: Idle Air Control (IAC) Valve Circuit Failure
  • DTC P1607: Powertrain Control Module (Pcm) Internal Circuit Failure
  • DTC P1660: Automatic Transmission Fuel Injection (A/T FI) Data Line
  • DTC P1681, P1682, P1686 Or P1687: Automatic Transmission Fuel Injection (A/T FI) Signal "A" & "B" Circuits