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5v ref

  • Ernrod
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10 Apr 2019 14:12 #28553 by Ernrod
5v ref was created by Ernrod
2002 dodge ram 1500 5.9l:
I have a no-start; no com. at data link; replaced cam and crank sensor; I have good ground; 5v ref. Is 5.2 volts; all fuses and replays are working; I only have 1 power source at transmission relay (pin 30), I checked for second voltage supply to relay with key on and cranking engine but no second voltage supply to relay.
I did find transmission range sensor (park/neutral) bare wire rapped are another bare wire.
Any suggestions?
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10 Apr 2019 15:22 #28555 by chief eaglebear
Replied by chief eaglebear on topic 5v ref
is there power at dlc

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10 Apr 2019 15:46 #28556 by Ernrod
Replied by Ernrod on topic 5v ref
Yes

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10 Apr 2019 16:10 #28557 by Ernrod
Replied by Ernrod on topic 5v ref
I have no fuel pressure and no spark

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10 Apr 2019 16:13 #28558 by Ernrod
Replied by Ernrod on topic 5v ref
Is 5v ref. Ok at 5.2 volts?

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10 Apr 2019 16:22 #28559 by Ernrod
Replied by Ernrod on topic 5v ref
Also, the truck will crank and not crank at times

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11 Apr 2019 12:36 - 11 Apr 2019 12:43 #28570 by John Curtis
Replied by John Curtis on topic 5v ref
You may have a bad ground or an open circuit if your fuse that controls the PCM/ECM is not blown. I would check for blown fuses first since that's the easiest thing to notice though I don't think that is going to be your problem.


Being that you have an intermittent crank/no crank... the PCM shouldn't have anything to do with that. That being said, that would be my starting point for diagnosing the problem.

Check your grounds at the fuse box. Maybe swap the relay even though you checked it and also check the voltage in the relay sockets. Then focus on the starter circuit. Check for power on fuse #14. Focus your attention between the ignition switch and the starter motor.

I wouldn't go any further until you are getting crank every time your turn your key.
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11 Apr 2019 13:23 #28572 by chief eaglebear
Replied by chief eaglebear on topic 5v ref
maybe monitor crank signal at computer the fact that it is intermittent might be an ignition switch but with no fuel pressure and no spark leads me to believe your crank signal is cutting out somehow I would go through crank and cam circuits thouroughly make sure signal is getting to computer also we must determine what module is in charge during cranking and which one is in charge during run

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11 Apr 2019 22:20 #28605 by Monde
Replied by Monde on topic 5v ref

Ernrod wrote: 2002 dodge ram 1500 5.9l:
I have a no-start; no com. at data link; replaced cam and crank sensor; I have good ground; 5v ref. Is 5.2 volts; all fuses and replays are working; I only have 1 power source at transmission relay (pin 30), I checked for second voltage supply to relay with key on and cranking engine but no second voltage supply to relay.
I did find transmission range sensor (park/neutral) bare wire rapped are another bare wire.
Any suggestions?


As you may know, If the pcm does not receive the signal from the transmission range sensor, it will not ground the starter relay. Did you fix the bare wire issue?

Vouloir, c'est pouvoir.

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12 Apr 2019 00:06 #28608 by Ernrod
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I separated the 2 wires that were touching but I still don't get a signal to the switch wire, brown yellow wire

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12 Apr 2019 00:09 #28609 by Ernrod
Replied by Ernrod on topic 5v ref
Looks like those 2 wires have been touching for some time. I'm thinking those wires may have shorted the signal from the pcm (Brown/yellow). Or caused a open somewhere

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12 Apr 2019 00:13 #28610 by Ernrod
Replied by Ernrod on topic 5v ref
If the transmission range sensor sends a signal to pick would that be sent through the brown/yellow wire?

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12 Apr 2019 00:15 #28611 by Ernrod
Replied by Ernrod on topic 5v ref
I'm assuming the transmission range sensor is bad, because I get no signal during cranking

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13 Apr 2019 19:58 #28662 by Monde
Replied by Monde on topic 5v ref

Ernrod wrote: If the transmission range sensor sends a signal to pick would that be sent through the brown/yellow wire?


Yes, the br/yel wire is the signal wire. Do you have 2 power at the starter relay with key on or cranking?

Vouloir, c'est pouvoir.

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13 Apr 2019 22:17 #28669 by Ernrod
Replied by Ernrod on topic 5v ref
Yes, I have the 2 powers at starter relay

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13 Apr 2019 22:18 #28670 by Ernrod
Replied by Ernrod on topic 5v ref
Should I have 2 powers at transmission relay?

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13 Apr 2019 22:23 #28671 by Ernrod
Replied by Ernrod on topic 5v ref
What shouldould be my ground measurement at the pcm? It has 2 ground wires

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