I was recently asked to look at a Hyundai santa fe displaying an abs fault, the customer reported abs +esp warning lamps on with pre-heat lamp flashing also. Upon reading the error codes in abs and engine management modules one code was retrieved from each, abs module displayed C1702 (variant coding error)and engine management P1593 (four wheel drive recognition) It appeared that the two modules concerned were unable to establish variant of vehicle i.e. two wheel drive or four wheel drive upon initialisation, in the case of the pcm this is achieved by the grounding of pin 65 on the module and communication with the transfer case module. I had noticed earlier that the differential lock warning lamp was inoperative …

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With the recent heat wave we have had the expected influx of customers with air conditioning faults, it is usually a case of refilling or top up of  refrigerant to rectify the problem but this case was different.  This Citroen climate control had not functioned for around 18 months and after the customer spending over £250 on unnecessary repairs at another garage the fault still remained. I started with a diagnostic interrogation of all modules that influence the ac, bsi, climate control, and pcm, numerous error codes were read so i  began with a fault clear broadcast. After studying live data in various modules i established refrigerant pressure was ok and that the various control circuits were functional. However i …

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