When there is a problem starting or driving a vehicle, two of the most important checks involve the ignition and the fuel systems. The questions most mechanics attempt to answer first, "is there spark-" and "is there fuel-" will often lead to solving most basic problems. For ignition system diagnosis and testing, please refer to the information on engine electrical components and ignition systems found earlier in this guide. If the ignition system checks out (there is spark), then you must determine if the fuel system is operating properly (is there fuel-).
The CIS-E Motronic system features built-in diagnostic circuitry. If the system experiences unusual values the system will set a code(s) for later access by specialized diagnostic equipment. An OBD-II scanner may be used to scan for fault codes.