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96 Dodge Ram van 3.9 PCM issue

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Old 12-11-2021, 12:31 PM
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Default 96 Dodge Ram van 3.9 PCM issue

Well, happy holidays and safe season for you all. I need to verify my findings with you guys on the this PCM issue. Too many codes (misfired) all related to the injectors; with a DMM I checked the wire of each injector: 4 of them with between 16.1 to 16.3 ohms and 2 with between 1.1 to 1.5 ohms. The volts reading is 13.6. Five of the injector had pulse, but one of them does not have a pulse, the green stayed on,(ground output) while the others ones pulsated. All these tests are done directly from the PCM connector (B) which is the white connector. The crankshaft position sensor is good.
Do I have a bad driver on injector # 2?.
Thank you and GOD BLESS
 
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Old 12-11-2021, 07:32 PM
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Were the 1.1 and 1.5 ohms the readings when testing the injectors? If so, those are certainly bad.
 
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Old 12-11-2021, 09:01 PM
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Yes; what the ohms values should be?. 16 ohms as the others.
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Old 12-11-2021, 09:13 PM
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I think 12 to 16 is acceptable.

That said, my general practice has always been, if one is bad, replace it, if two are bad, replace them ALL. They all live in the exact same environment.... so, if you have more than one failing, you can bet the others likely aren't far behind.
 
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Old 12-11-2021, 09:22 PM
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I am confuse, are you talking about the injectors, they are new, the ohms measurements are from the wires, coming out from the PCM, as I expiained on the original post. Is the PCM bad due to not pulse on injector 1?
thank you
 
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Old 12-12-2021, 10:47 AM
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How are you measuring resistance? Is it JUST the wire you are testing? Or is the injector also in the circuit?
 
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Old 12-12-2021, 02:45 PM
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Yes: measuring resistant: just the wire and then with the injectors in the circuit. Five came with 16.8 and 1 with 17.1. I did repair 3 wires and tested for continuity which turned out good.
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Old 12-12-2021, 05:27 PM
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The wires I would expect to have little or no resistance, (at least, not on that short of a run.) with the injectors inline as well, you should see consistent numbers across all of them. (within an ohm or two, I should think) If that's the case, then you are likely OK on that.
 
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Old 12-17-2021, 07:31 PM
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The PCM was bad, injector #2 driver. Did a search online found a YouTube video, which showed how to test the PCM for voltage drop and found a -11 on the ground side
Cavity C: B12pin which is the ground for the injector connector #2.
 



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