It behaved perfectly until they needed to overtake or put the engine under load, which resulted in a stall. After a short interview, we had gathered some more information: that the vehicle would start and run from cold just fine. You’ve got to love certain customer’s comments. The customer’s descriptions on the job card read: “under load, wants to conk out”. We needed to confirm the fault to start with. The fault codes were “P2146: Injector 1 & 2 Power supply short to ground” and “P2146: Injector 3 & 4 Power supply short to ground”. I had the opportunity to try out some new testing methods when I was asked to take a look at a Nissan X-Trail with two fault codes that pointed to all four injectors. ![]() And even when you send them away it’s not always straight forward, with many diesel companies saying they can only really check spray patterns as they can’t load the injectors the way they would be when fitted to the vehicle. Something that crops up time and time again is how to test and diagnose piezo injectors without having to send them away. Electrical windings in the injector are checked with an oscilloscope and an ohms test. White Paper - Active Differential Probes Check spray pattern and reverse flow to check for contaminants. ![]()
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