Engine Controls - Self-Diagnostics

• Introduction
• Self-Diagnostic System
  • Notes
  • Malfunction Indicator Light (Mil)
    • Notes
    • Hard Failures
    • Intermittent Failures
  • Retrieving Diagnostic Trouble Codes
    • Notes
    • Using Malfunction Indicator Light (MIL)
    • Using Scan Tool
  • Freeze Frame Data
  • Pcm Reset Procedure/Clearing Diagnostic Trouble Codes
    • Notes
    • Without Scan Tool
    • Using OBD-II Scan Tool
  • Pcm Location
• Test Equipment
  • Notes
  • Connector Identification
• Summary
• Diagnostic Trouble Code Definitions
• Diagnostic Circuit Check
  • Notes
  • Malfunction Indicator Light (Mil)
    • Intermittent Symptom
    • Malfunction Indicator Light (MIL) Never Illuminates After Ignition Is Turned On
    • Malfunction Indicator Light (MIL) Stays Illuminated
• Diagnostic Tests
  • DTC P0107: Map Sensor Low Voltage Input
  • DTC P0108: Map Sensor High Voltage Input
  • DTC P0112: IAT Sensor Low Voltage Input
  • DTC P0113: IAT Sensor High Voltage Input
  • DTC P0116: ECT Sensor Range/Performance Problem
  • DTC P0117: ECT Sensor Circuit Low Voltage Input
  • DTC P0118: ECT Sensor Circuit High Voltage Input
  • DTC P0122: TP Sensor Circuit Low Voltage Input
  • DTC P0123: TP Sensor Circuit High Voltage Input
  • DTC P0131 Or P0151: Primary Ho2S-1 Circuit Low Voltage
  • DTC P0132 Or P0152: Primary Ho2S-1 Circuit High Voltage
  • DTC P0133 Or P0153: Primary Ho2S-1 Slow Response
  • DTC P0135, P0141 Or P0155: Ho2S Heater Circuit Malfunction
  • DTC P0137: Secondary Ho2S-2 Low Voltage
  • DTC P0138: Secondary Ho2S-2 High Voltage
  • DTC P0139: Secondary Ho2S-2 Slow Response
  • DTC P0171, P0172, P0174 Or P0175: Fuel System Is Too Lean Or Too Rich
  • DTC P0325 Or P0330: Knock Sensor (KS) Circuit Malfunction
  • DTC P0335, P0336, P1336, P1337, P1381, P1382, P1386 Or P1387: CKP/CYP Sensors Malfunction
  • DTC P0401: EGR - Insufficient Flow Detected
  • DTC P0420: Catalyst Efficiency Below Threshold
  • DTC P0451: Fuel Tank Pressure Sensor (Ftps) Range/Performance Problem
  • DTC P0452: Fuel Tank Pressure Sensor (Ftps) Low Voltage
  • DTC P0453: Fuel Tank Pressure Sensor (Ftps) High Voltage
  • DTC P0505: Idle Control System Malfunction
  • DTC P0560: Low Voltage In Pcm Back-Up Circuit
  • DTC P1106: Barometric Pressure (BARO) Sensor Range/Performance Problem
  • DTC P1107 Or P1108: Problem In BARO Sensor Circuit
  • DTC P1121: Throttle Position (TP) Lower Than Expected
  • DTC P1122: Throttle Position (TP) Higher Than Expected
  • DTC P1128: Manifold Absolute Pressure Lower Than Expected
  • DTC P1129: Manifold Absolute Pressure Higher Than Expected
  • DTC P1201-P1206 Or DTC P1301-P1306: Misfire Detected
  • DTC P1201-P1206 Or P1301-P1306 Set With DTC P0300: Random Misfire Detected
  • DTC P1316 Or P1317: Spark Plug Voltage Detection Circuit Malfunction
  • DTC P1318 Or P1319: Spark Plug Voltage Detection Module Reset Malfunction
  • DTC P1456: EVAP Control System
  • DTC P1457 EVAP Control System
  • DTC P1486: Thermostat Range/Performance Problem
  • DTC P1491: Insufficient EGR Valve Lift Detected
  • DTC P1498: EGR Valve Lift Sensor Voltage High
  • DTC P1508: Idle Air Control (IAC) Valve Circuit
  • DTC P1607: Pcm Internal Failure