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2001 dodge ram 2500 van 318 /v8 2W /RWD

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19 Mar 2020 06:25 #38435 by frankiedon450
2001 dodge ram 2500 van 318 /v8 2W /RWD was created by frankiedon450
HI, 2001 DODGE RAM 2500 VAN 318/ V8 : DOES ANYONE KNOW WHY THE LDP HAS A WIRE, WT/BLUE TO THE ALTERNATOR AND EXACTLY WHAT PART THE CONNECTION PLAYS WITH THE LDP? IS IT THE MAIN PWR FEED TO THE LDP? AND IF I DO A SHORT TO GROUND TEST ON THE ORANGE WIRE DO I DO IT WITH THE LDP CONNECTED OR DISCONNECTED. I AM PURSUING A PROBLEM IN THE LDP CIRCUIT BECAUSE, NEITHER MY EVAP NOR CAT. MONITORS WOULD RUN NO MATTER HOW MANY TIMES I DO THE DRIVE CYCLE. THANK YOU. FRANK. [MY CAPITALS ARE JUST FOR EASIER READING]

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19 Mar 2020 09:47 - 19 Mar 2020 09:53 #38440 by John Curtis
Replied by John Curtis on topic 2001 dodge ram 2500 van 318 /v8 2W /RWD
Is it 1494 or 1495??

Flowchart below for 1494.

Thinking out loud always helps me in the process.
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Last edit: 19 Mar 2020 09:53 by John Curtis.

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19 Mar 2020 09:52 #38441 by John Curtis
Replied by John Curtis on topic 2001 dodge ram 2500 van 318 /v8 2W /RWD
Here’s a flow chart for 1495

Thinking out loud always helps me in the process.
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The following user(s) said Thank You: Noah, frankiedon450

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20 Mar 2020 04:29 #38476 by frankiedon450
Replied by frankiedon450 on topic 2001 dodge ram 2500 van 318 /v8 2W /RWD
Hi John. Thanks for your response and the info. The code is p1494 although I did not know that the scanner had a code all this time. The only tests that I can do are volts and ohm and short to ground. I have a VOM but my scanner doesn't have bi-directional. What I would like to know is; is it normal for the 3wires on the LDP to have alternator voltage at the same time? Voltage is only there when the engine is running. If it has voltage, what could be wrong? The LDP is new. I'm not in the US, the van is old, and I have to order the parts, so I decided to replace the parts before they go bad. Thanks for your help, Frank

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20 Mar 2020 09:18 - 20 Mar 2020 09:22 #38477 by John Curtis
Replied by John Curtis on topic 2001 dodge ram 2500 van 318 /v8 2W /RWD
White and dark blue is gen source/alternator power.

White/Dark green has to be a ground in order to complete the circuit.


Here is a test. Disconnect the LDP and see if the orange wire still has battery voltage. Test lead on battery ground and and the other on the orange wire pin. If it does have alt voltage then you have a wiring problem.

You can do the same for the dark green wire. It should not have alt voltage with the LDP unplugged. If it doesn’t read anything, turn your meter down to 1v or 200mv if it can go that low and see what it reads. Sensor ground should not read above 100mv.

The important factor here is testing them while they’re NOT plugged in.

Thinking out loud always helps me in the process.
Last edit: 20 Mar 2020 09:22 by John Curtis.

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20 Mar 2020 14:51 #38493 by frankiedon450
Replied by frankiedon450 on topic 2001 dodge ram 2500 van 318 /v8 2W /RWD
ok John I did those tests you suggested: ENGINE RUNNING/ ORANGE WIRE .026 V.025V .043V IT WAS CHANGING / ITS A RANGING METER
WT/GREEN 0.05V
WT/BLUE 13.7V

ENGINE NOT RUNNING WT/DG WIRE 0.03
ORANGE WIRE 0.00 0.01

NOW MOVING THE DMM TO mv : WT/GREEN 174.5 mv IGN OFF / IGN ON 11.0 mv
engine running 47.2mv. If I got the tests correct then the ground is way above the 100mv but I can't remember straight off what that is suppose to mean. bad ground? maybe ?

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20 Mar 2020 16:30 #38497 by frankiedon450
Replied by frankiedon450 on topic 2001 dodge ram 2500 van 318 /v8 2W /RWD
Hi John. All of your responses are going to my wife's e-mail. Is there any way that you can send them to 'This email address is being protected from spambots. You need JavaScript enabled to view it.' which is mine. Thank you, Frank

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