The system is fully supported by serial communication from a number of manufactures with access to serial data and Dtc s The ECM is easily located by the side of the battery 55 pin.
To evaluate the injectors fully I suggest the following options 1 Oscilloscope 2 Inductive current clamp 3 Digital multi meter 4 Code reader 5 Exhaust gas analyser My choice would be the oscilloscope and the inductive current clamp Measuring the voltage path and the current during the opening period ensures complete knowledge of the circuit and how the injector is responding First measurement is the injector pulse time which should be 3 2 m s with a hot engine Next look at the inductive spike at the close of the injector this is critical and should peak at 57 64 volts You are going to have to use a good scope to clip it accurately I have given you enough clues in this direction Current flow is the most conclusive evidence 1 amp only please.
Using the DMM carefully note the resistance this will vary with temperature, at ambient temperature expect 14.5-15 ohms be critical (if you are looking for flexibility go to the gym). Faulty injectors usually have a lower ohmic value. The next option is serial interrogation but this method does not stand a cat in hell chance of premature or intransient injector error. I do not subscribe to changing all injectors only replacing faulty items after careful evaluation ensuring a durable repair...Access to the injector loom is ideal for all the above options without removal. Final choice of evaluation using a gas analyser my choice would be the Crypton 290. Although only a 4 gas unit offering no nox measurement it has a far superior filtration system and the sample pumping rate is twice that of the 295 five gas unit the gas bench is a superior andross unit utilising a mechanical chopper. Using the gas bench to assist in injector evaluation may not be that straightforward. Assuming the following normal figures.
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