Question about 1999 Chevrolet Tahoe

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I have no start and no ground to injectors. 99 tahoe 5.7

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  • Chevrolet Master
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The PCM controls the ground to the injectors. Does the check engine light come on for a bulb check when the key is turned on? Check ECM fuses in underhood fuse/relay center. There is usually 2 10 amp fuses protecting the PCM circuitry.

Posted on Apr 25, 2015

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  • Chevrolet Master
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Like Paul said. You wont have ground until the PCM commands it. You can test the firing with a test light or noid light. Pull an injector plug, plug a noid light in(use a test light, you have to put a wire in one side and touch the other side with the probe). Crank the engine over. If the light flashes, the PCM is good. If not, check a couple more injector plugs. If still no flash. and you have good PCM fuses. Replace the PCM. Just a note. Pull the fuses and look at them, if good, put them back in and check firing again. Fuses get corroded too. By pulling them you make a better contact going back in. If you have a PCM relay, check it also. Best to swap it out with another.

Posted on Apr 25, 2015

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