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NGK Spark Plugs (UK) Ltd has a full time staff of Technical, Sales and Support Personnel at its Head Office in Hemel Hempstead as well as an external Sales Team covering all parts of the UK. For postal enquiries our Head Office addess is:
NGK Spark Plug (UK) Ltd,
Maylands Avenue
Hemel Hempstead
Herts, HP2 4SD
Telephone: 01442 281000
Fax: 01442 281001
Some U5 category coils have a two-pin primary connector (example: U5001). In this case the diagnosis is the same as with classic single coils of the U1 category. See there for details.
Some coils of the U5 category are equipped with integrated ignition controllers (example: U5011). Therefore, in this case the primary resistance cannot be measured. On the “Signal1” (Trig) connector only the “switch” signal coming from the engine control module can be measured.
Measurement of secondary resistance
Note: Some ignition coils contain diodes to suppress undesired sparks. If diodes are installed, resistance measuring is not possible.
Example
This is the wiring diagram of a VW Sharan 2.8, engine code AYL. It uses coil type U5011.
The resistance of the primary coil cannot be measured due to the integrated ignition module. The resistance of the secondary circuit can be measured in between Pin2(GND) and the high voltage output.
