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Engine Controls - Self-Diagnostics Expand All (for easy ctrl-f) Collapse All Introduction Self-Diagnostic System Test Equipment Summary Diagnostic Trouble Code Definitions Diagnostic Circuit Check Diagnostic Tests DTC P0107: Map Sensor Circuit Low Voltage Input DTC P0108: Map Sensor Circuit High Voltage Input DTC P0112: IAT Sensor Circuit Low Voltage Input DTC P0113: IAT Sensor Circuit High Voltage Input DTC P0116: ECT Sensor Circuit 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: Primary Ho2S-1 Circuit Low Voltage DTC P0132: Primary Ho2S-1 Circuit High Voltage DTC P0133: Primary Ho2S-1 Slow Response DTC P0135 Or 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 Or P0172: Fuel System Is Too Lean Or Too Rich DTC P0300 Set With DTC P0301, P0302, P0303, P0304, P0305 Or P0306: Random Misfire DTC P0301, P0302, P0303, P0304, P0305, Or P0306: Misfire In One Cylinder DTC P0325: Knock Sensor (KS) Circuit Malfunction DTC P0335 Or P0336: CKP Sensor Malfunction DTC P0401: EGR System - Insufficient Flow Detected DTC P0420: Catalyst System - Efficiency Below Threshold DTC P0451: Fuel Tank Pressure Sensor Circuit Range/Performance 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 P0720: Countershaft Speed Sensor Circuit DTC P1106: Barometric Pressure (BARO) Sensor Range/Performance Problem DTC P1107 Or P1108: Problem In Barometric Pressure (BARO) Sensor Circuit DTC P1121: Throttle Position Lower Than Expected DTC P1122: Throttle Position Higher Than Expected DTC P1128: Manifold Absolute Pressure Lower Than Expected DTC P1129: Manifold Absolute Pressure Higher Than Expected DTC P1297: Low Voltage Electrical Load Detector (Eld) Circuit DTC P1298: High Voltage In Electrical Load Detector (Eld) Circuit DTC P1361 Or P1362: TDC1 Sensor Circuit, Or DTC P1366 Or P1367: TDC2 Sensor Circuit DTC P1456: EVAP Control System DTC P1457 EVAP Control System DTC P1486: Range/Performance Problem In Thermostat DTC P1491: Insufficient EGR Valve Lift DTC P1498: EGR Valve Lift Sensor Voltage High DTC P1519: Malfunction In IAC Valve Circuit DTC P1607: Pcm Internal Failure DTC P1676: Frame-To-Powertrain Torque Down Request (FPTDR) Signal Line Failure DTC P1678: Frame-To-Powertrain Torque Down Request (FPTDR) Signal Line Failure