Introduction to On Board Diagnostics (II)

Fundamentals of PowertrainControl strategies & OBD IIDiagnosticsThrottle position Sensor (TPS) ( DTCs 120-124, 124, 220-229):229):TP sensor diagnostics are performed for deterioration of potentiometer tiometer operatedswitch A circuit characteristics. In case of switch A circuit malfunctionmfault code 120 is assigned. If the switch A circuit is indicating out of rangereading fault code 121 is assigned. If the switch A circuit is indicating very lowreading fault code 122 is assigned. If the switch A circuit is indicating very highreading fault code 123 is assigned. The expected value is estimated using air flowsensor reading and engine parameters. If the switch A circuit is indicatingintermittent faulty reading fault code 124 is assigned. For switch B circuit , faultcodes 220-224 224 are set for identical faults listed above. For switch C circuit cuit , faultcodes 225-229 229 are set for identical faults listed above.