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Ok, since you have replaced half of the injectors you should Ohm the rest of them with Ohm-Meter..a good reading is around 14.5 Ohms... If its way out, replace that injector...
Code 27 Injector control circuit
Injector output driver does not respond properly to the control signal.
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And you said that you have checked the injectore and replaced the PCM... Was it a new PCM?
Well if the Injectors are within spec, and wiring is good.. It will have to be PCM.. Why was PCM the first time?
Welcome to JustAnswer, my name is XXXXX XXXXX I'm here to help get your problem resolved. Ask follow up questions, thanks. Considering PCM has been replaced and injectors have been tested it sounds like a wiring problem between pcm and injectors. Use a LED testlight to see if each injector has good ground pulse..Whatever one doesnt have ground pulse test wiring between that injector and PCM for shorted/open circuits..If good replace pcm..If shorted or open run new wires or replace harness. Check the splice A-142, at the rear of the wiring harness that runs next to the valve cover, for poor connection on injector feeds..Here is a wire diagram to help with testing and troubleshooting instructions for injector 2..troubleshooting will be the same for each injector just on diffferent wires. Let me know if you have questions, thanks.