AIM:
1) To test injectors
2) To test cable integrity
3) To test ballast resistor pack
Parts Required
1) Screwdrivers
2) Digital Voltmeter
3) Good quality cable set for meter
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2) Pull off the injector plug and connect the volmeter between the injector plug terminal 2 and ground
3) Turn on the ignition ensuring that any immobilser is deactivated. The DVM should show battery voltage
4) If there is no display disconnect the 5 pin plug for the fuel injector ballast resistor. Connect the DVM between terminal 3 and ground. You should see battery voltage coming from the DME. If no voltage is present, this means theres is a break between the DME and the connector. If there is voltage here but not at the injector lead then the ballast resistor pack is faulty.
5) Now this is where it goes wierd ! The manual says (and I know now for good reason) to remove ALL plugs off the injectors, However,as the 4th one, is buried under the fuel pipes and not that easy to get to I decided not to. (As I know my injectors are fine!) The idea is you should measure 6 ohms, between the 5 pin ballast resistor plug and terminal 2. The enclosed "test" sheet shows the various results (on injector pin's 1 & 2 with "3" injector plugs out) and what resistance I measured on the round connector depending on what injector I was testing. NOW if you pull all the plugs out pls update me with your own results and on what pins.
6) And finally put your meter across the 2 pins of the actual injector and you should read 2-3 Ohms.
7) In true Haynes style "re-fitting is reverse of removal !" i.e. reassemble all the bits back.