Engine Controls - Self-Diagnostics

• Connector Identification
• Diagnostic Trouble Code Identification
• Diagnostic Tests
  • Notes
  • Malfunction Indicator Light (Mil) Malfunction
    • Intermittent Symptom
    • 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
  • DTC P0108: Map Sensor Circuit High Voltage Input
  • 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 (ECT) Sensor Range/Performance Problem
  • DTC P0117: Engine Coolant Temperature (ECT) Sensor Low Voltage Input
  • DTC P0118: Engine Coolant Temperature (ECT) 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 Sensor Low Voltage
  • DTC P0132: Primary Ho2S-1 Sensor High Voltage
  • DTC P0133: Primary Ho2S-1 Sensor Slow Response
  • DTC P0135 Or DTC P0141: Ho2S Sensor Heater Circuit Malfunction
  • DTC P0137: Secondary Ho2S-2 Sensor Low Voltage
  • DTC P0138: Secondary Ho2S-2 Sensor High Voltage
  • DTC P0139: Secondary Ho2S-2 Sensor Slow Response
  • DTC P0171 & DTC P0172: Fuel Supply System (Too Lean Or Too Rich)
  • 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
    • Other Possible Causes
  • DTC P0301-P0304: Misfire In One Cylinder Detected
  • DTC P0325: Knock Sensor (KS) Circuit Malfunction
  • DTC P0335, DTC P0336, DTC P1361 & DTC P1362: CKP/TDC Sensor
  • DTC P0401: EGR Insufficient Flow
  • DTC P0420: Catalytic System Efficiency Below Threshold
  • DTC P0451: Fuel Tank Pressure (Ftp) Circuit Range/Performance Problem
  • DTC P0452: Fuel Tank Pressure (Ftp) Sensor Low Voltage
  • DTC P0453: Fuel Tank Pressure (Ftp) Sensor High Voltage
  • DTC P0500: Vehicle Speed Sensor (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) Lower Than Expected
  • DTC P1129: Manifold Absolute Pressure (Map) Higher Than Expected
  • DTC P1259: VTEC Pressure Switch & Solenoid Valve Circuit
  • DTC P1297: Electrical Load Detector (Eld) Low Voltage Input
  • DTC P1298: Electrical Load Detector (Eld) High Voltage Input
  • DTC P1359: Crankshaft Position/Top Dead Center (CKP/TDC) Sensor
  • DTC P1381 & DTC P1382: CYP Sensor
  • 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 (VSV) 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 (VSV) Test
    • Canister System Leak Test
  • DTC P1491: EGR System Malfunction
  • DTC P1498: EGR Valve Lift Sensor High Voltage
  • DTC P1508: Idle Air Control (IAC) Valve
  • DTC P1607: Pcm Internal Circuit
  • DTC P1655: SEAF/SEFA A/T Signal Line Failure