Symptom: OBD light alarm on the instrument, the engine idling instability.
    Check the analysis: the use of fault diagnosis instrument V.A.G1552 detection and found no trouble-free storage, the engine idling speed between 500 ~ 900r / min irregular fluctuations. Read data stream (01-08-014) no fire records, 01-08-001 oxygen sensor adjustment value is also within the normal range, check the main sensor data is not found abnormal. Through the above checks, the author's intuition is the intake system has a leak or cylinder pressure problems, but the relevant parts of the inspection and measurement of cylinder pressure after the author ruled out this possibility.
    Taking into account the car is a new car, the possibility of a mechanical failure is small, then decided to first check whether there is damage to electrical components caused by the possibility of failure. (01-08-55), the steering pressure switch signal is found to be -12 in the third zone data. This is an abnormal value. The normal value should not be less than -2. This signal is abnormal. There is a phenomenon of starting or turning off.
    Will be turned to the pressure switch harness plug unplugged, the engine idling immediately running smoothly, thus determining the cause of the fault is turned to the pressure switch caused by the wrong signal.
    Troubleshooting: replace the steering pressure switch, test troubleshooting.
    Review Summary: Bora car steering pressure switch signal can be read from the 01-08-055 data stream, Polaris GP sedan before the car can read out the "1" or "0" of a switch signal, and Polaris GP data Flow to the pressure switch signal can be directly read the specific value.