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2006 dodge ram 5.7. P0300 misfire and a p0174 1/2. Lean code
- gerber
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- Tyler
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5 years 7 months ago #37419
by Tyler
Replied by Tyler on topic 2006 dodge ram 5.7. P0300 misfire and a p0174 1/2. Lean code
Either your new pump is junk, or you have some kind of voltage drop in the pump circuit. 
If you have an amp probe, you can measure pump current to check for a voltage drop concern. Otherwise, you'll need to get to the pump connector.
You can do direct voltage measurements with the pump plugged in (if possible), or unplug the connector and substitute a heavy load. Two headlamp bulbs would work. If you have power and ground, your new pump is bad. If you find the bulbs won't light brightly, or you find excessive voltage drop, pursue the offending circuit.
If you have an amp probe, you can measure pump current to check for a voltage drop concern. Otherwise, you'll need to get to the pump connector.You can do direct voltage measurements with the pump plugged in (if possible), or unplug the connector and substitute a heavy load. Two headlamp bulbs would work. If you have power and ground, your new pump is bad. If you find the bulbs won't light brightly, or you find excessive voltage drop, pursue the offending circuit.
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- gerber
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5 years 7 months ago - 5 years 7 months ago #37421
by gerber
Replied by gerber on topic 2006 dodge ram 5.7. P0300 misfire and a p0174 1/2. Lean code
Do yo think the throttle body has to do something with this problem. Because i see voltage drop app 2 and i know this voltage drop is not right first picture is without press the pedal. And secound picture is at wot.
Last edit: 5 years 7 months ago by gerber.
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- gerber
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5 years 7 months ago #37423
by gerber
Replied by gerber on topic 2006 dodge ram 5.7. P0300 misfire and a p0174 1/2. Lean code
And yes idid check the current with the old fuel pump. And the new fuel pump
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- Tyler
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5 years 7 months ago #37424
by Tyler
Replied by Tyler on topic 2006 dodge ram 5.7. P0300 misfire and a p0174 1/2. Lean code
You only see the dropouts on APP 2, right? I'm pretty sure you're looking at a PCM circuit fault detection strategy. It's intentional, weird as it sounds. The PCM will pulse APP 2 to ground and look for the same pulsing in APP 1. It's there to check for shorts between the two circuits.
If you were to scope the same circuit, you'd see the pulsing to ground is actually far more frequent. It only looks that way on the scanner because of it's limited data rate.
So the short answer is, no. :silly: Normal condition.
It's intentional, weird as it sounds. The PCM will pulse APP 2 to ground and look for the same pulsing in APP 1. It's there to check for shorts between the two circuits.If you were to scope the same circuit, you'd see the pulsing to ground is actually far more frequent. It only looks that way on the scanner because of it's limited data rate.
So the short answer is, no. :silly: Normal condition.
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5 years 7 months ago #37425
by Tyler
Replied by Tyler on topic 2006 dodge ram 5.7. P0300 misfire and a p0174 1/2. Lean code
I can't see the scale on your scope capture. 
Looks good from what I can see. If it's in the 7-10 amp range and stays there during a WOT snap, you're done. Pump time (again).
Looks good from what I can see. If it's in the 7-10 amp range and stays there during a WOT snap, you're done. Pump time (again). Please Log in or Create an account to join the conversation.
- gerber
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- Tyler
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- gerber
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5 years 7 months ago #37432
by gerber
Replied by gerber on topic 2006 dodge ram 5.7. P0300 misfire and a p0174 1/2. Lean code
Its a new assembly .
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- Tyler
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5 years 7 months ago #37434
by Tyler
Replied by Tyler on topic 2006 dodge ram 5.7. P0300 misfire and a p0174 1/2. Lean code
Look at you with your yellow Snappy 18V. 
If you want confirmation of weak/bad pumps, you can also deadhead the pump by installing a pressure gauge directly into the fuel line. With the pump running, the pressure should exceed 100 PSI. You can also do this at the pump itself. If it won't go that high, the pump is junk.
If you want confirmation of weak/bad pumps, you can also deadhead the pump by installing a pressure gauge directly into the fuel line. With the pump running, the pressure should exceed 100 PSI. You can also do this at the pump itself. If it won't go that high, the pump is junk.
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5 years 7 months ago #37439
by gerber
Replied by gerber on topic 2006 dodge ram 5.7. P0300 misfire and a p0174 1/2. Lean code
I think i find the problem look at the picture. Some one boosted the line qnd twist.
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- gerber
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- Tyler
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5 years 7 months ago #37447
by Tyler
I think you're onto something. Had the pump been changed before you got to it?
Replied by Tyler on topic 2006 dodge ram 5.7. P0300 misfire and a p0174 1/2. Lean code
gerber wrote: I think i find the problem look at the picture. Some one boosted the line qnd twist.
I think you're onto something.
Had the pump been changed before you got to it? Please Log in or Create an account to join the conversation.
- gerber
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5 years 7 months ago #37466
by gerber
Yes some work on it before me. That was the problem
Replied by gerber on topic 2006 dodge ram 5.7. P0300 misfire and a p0174 1/2. Lean code
Tyler wrote:
gerber wrote: I think i find the problem look at the picture. Some one boosted the line qnd twist.
I think you're onto something.
Yes some work on it before me. That was the problem
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- gerber
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