Engine Controls Self-Diagnostics

• Connector Identification
• Diagnostic Trouble Code Identification
• Diagnostic Tests
  • Notes
  • Malfunction Indicator Light (Mil) Malfunction
    • Malfunction Indicator Light (MIL) Never Comes On, Even For 2 Seconds After Ignition Is Turned On
    • Malfunction Indicator Light (MIL) Stays On Or Comes On After 2 Seconds
  • DTC P0107: Map Sensor Circuit Low Voltage Input (High Vacuum)
  • DTC P0108: Map Sensor Circuit High Voltage Input (Low Vacuum)
  • DTC P0112: Intake Air Temperature (IAT) Sensor Low Voltage Input
  • DTC P0113: Intake Air Temperature (IAT) Sensor High Voltage Input
  • DTC P0116: Engine Coolant Temperature Sensor Range/Performance Problem
  • DTC P0117: Engine Coolant Temperature Sensor Low Voltage Input
  • DTC P0118: Engine Coolant Temperature Sensor High Voltage Input
  • DTC P0122: Throttle Position (TP) Sensor Low Voltage Input
  • DTC P0123: Throttle Position (TP) Sensor High Voltage Input
  • DTC P0131: Primary Ho2S-1 Low Voltage
  • DTC P0132: Primary Ho2S-1 Sensor High Voltage
  • DTC P0133: Primary Ho2S-1 Slow Response
  • DTC P0135 Or DTC P0141: 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 & DTC P0172: Fuel Supply System
  • DTC P0300 & P0301-P0304: Random Cylinder Misfire Detected
    • Notes
    • Random Misfire Occurs During Low RPM & Low Engine Load
    • Random Misfire Occurs During Acceleration
    • Random Misfire Occurs During High Engine RPM & Load, Or Under Random Conditions
  • DTC P0301-P0304: Cylinder Misfire Detected
  • DTC P0325: Knock Sensor (KS) Circuit Malfunction
  • DTC P0335, DTC P0336, DTC P1361, DTC P1362, DTC P1381 & DTC P1382: CKP/TDC/CYP Sensor
  • DTC P0420: Catalytic System Efficiency Below Threshold
  • DTC P0451: Fuel Tank Pressure (Ftp) Sensor Range/Performance Problem
  • DTC P0452: Fuel Tank Pressure (Ftp) Sensor Low Voltage
  • DTC P0453: Fuel Tank Pressure (Ftp) Sensor High Voltage
  • DTC P0500 & DTC P0501: VSS Range/Performance Problem
  • DTC P0505: Idle Control System Malfunction
  • DTC P1106: BARO Sensor Range/Performance Problem
  • DTC P1107 & DTC P1108: BARO Sensor
  • DTC P1121 & DTC P1122: Throttle Position (TP) Sensor
  • DTC P1128: Manifold Absolute Pressure (Map) Sensor Lower Than Expected
  • DTC P1129: Manifold Absolute Pressure (Map) Sensor Higher Than Expected
  • DTC P1297: Electrical Load Detector (Eld) Low Voltage Input
  • DTC P1298: Electrical Load Detector (Eld) High Voltage Input
  • DTC P1336 & DTC P1337: Crankshaft Speed Fluctuation (CKF) Sensor
  • DTC P1359: CKP/TDC/CYP Sensor Circuit Problem
  • DTC P1456: EVAP System Leak Detected
    • Fuel Tank Filler Cap Check
    • EVAP Purge Control Solenoid Valve Test
    • EVAP Bypass Solenoid Valve Test
    • EVAP Control Canister Vent Shut Valve Test
    • Vacuum Hoses & Connections Test
  • DTC P1457: EVAP System Leak Detected (Canister System)
    • EVAP Purge Control Solenoid Valve Test
    • EVAP Bypass Solenoid Valve Test
    • EVAP Control Canister Vent Shut Valve Test
    • Canister System Leak Test
  • DTC P1508: Idle Air Control (IAC) Valve
  • DTC P1607: Pcm Internal Circuit