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Re: 99 2.2 no fire on #2 cylinder
All the injectors get their voltage supplied via the common source pink wire from Fuse 10 (20A) in the UEC. Splices are in the injector harness/loom to distribute this 12V power. The individual injectors are grounded in sequence by the PCM, terminals A2 (Cyl 3), A7 (Cyl 4), B10 (Cyl 1), and B11 (Cyl 2).
For reference, it IS safe to intermittently ground the grounded side of the injector to test their function without fear of damaging the PCM, since the PCM switched these lines to ground as part of normal operation.
If you ground B11 does the injector fire? If you connect a test light across +12V and B11 does is flicker while the engine is running? It may be that the PCM sinking output transistor is damaged or has poor connection internally or at the header connectors - Unseating and reseating the connector can help wipe them clean.
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