P0381 Glow plug circuit malfunction????? - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 01-19-2007, 06:56 PM   #1 (permalink)
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P0381 Glow plug circuit malfunction?????

I have a 2002 Excursion with the 7.3. It has been having difficulty starting for a while. The engine will start and then immediately die. However, now it won't start at all. It turns over fine, but won't fire. I got a code of P0381. I checked the relay and the 2 small terminals have 12 V and the Large brown terminal has 12 V, but the Red terminal has none. What do I need to do? Is the relay bad? Is there something else I can do? thank you for any help you can offer.
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Old 01-19-2007, 07:25 PM   #2 (permalink)
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Re: P0381 Glow plug circuit malfunction?????

[ QUOTE ]
I have a 2002 Excursion with the 7.3. It has been having difficulty starting for a while. The engine will start and then immediately die. However, now it won't start at all. It turns over fine, but won't fire. I got a code of P0381. I checked the relay and the 2 small terminals have 12 V and the Large brown terminal has 12 V, but the Red terminal has none. What do I need to do? Is the relay bad? Is there something else I can do? thank you for any help you can offer.

[/ QUOTE ]I hear these are different than trucks , but I think you should have close to the same voltage on both of the large terminals would be my guess...
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Old 01-20-2007, 04:07 AM   #3 (permalink)
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Re: P0381 Glow plug circuit malfunction?????

P0381 is a malfunction with the glow plug indicator lamp circuit. Since this lamp is controlled by the PCM independantly of the glow plug relay, there is no sense in looking to the GPR to cure the code.

That's not to say that there may not be a glow plug concern but that wont result in a "starts then dies" kinda thing, either.

With the key on, battery voltage is supplied to one of the small terminals on the relay. As long as the PCM isn't grounding the relay (to turn it on), battery voltage will be seen at both small terminals. Once the PCM commands the GPR "on", slightly less than B+ will be seen at one small terminal and the other will be close to 0 volts.

For the large terminals.... As long as the relay isn't turned "on", B+ will be seen at one large terminal and 0 volts at the other. When the PCM commands the GPR on, we should see a little less than B+ at both terminals.

This is volt drop testing at it's most basic... it looks and sounds difficult but, in actuality, it is quite simple when we give it some thought. If we can grasp this concept, electrical testing becomes a snap.
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Old 01-20-2007, 10:08 AM   #4 (permalink)
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Re: P0381 Glow plug circuit malfunction?????

[ QUOTE ]
I checked the relay and the 2 small terminals have 12 V and the Large brown terminal has 12 V, but the Red terminal has none.

[/ QUOTE ]
You don't have a glow plug relay on that Excursion, They use a glow plug controller module that looks like
THIS SILVER BOX WITH FINS.
The relay your checking must be for the intake manifold air heater by the color of the wires your checking. A proper scan tool is needed to check this system. If your running a chip on your X thats not compatible with the California emissions you will get that code. When my X was setting this code I found the glow plugs staying on for 3 minutes, checked using a volt meter at the glow plug not the wait to start light, every time the key was turned to run both hot and cold, not good for the glow plugs. Getting a California emissions burn on the chip took care of the problem.
I hope Jody at DP Tuner can make his F5 chips work with this glow plug controller system as well as the PATS the Excursions use as this is in the near future for me.
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Old 01-20-2007, 12:38 PM   #5 (permalink)
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Re: P0381 Glow plug circuit malfunction?????

I've got a 2000 X 7.3 also....

There is a solid state GPR on top of your passenger side valve cover.

Mine went bad, and gave off a code [?]...

A couple of other guys experienced the same thing..TedExcursion did I think...about 2 years ago?

It didn't prevent me from driving however...

Ford garage wanted $225 for the relay, and another $100+ to install.

I bought the relay on line, for $125, and installed in 10 minutes

Everything was fine.. [img]/ubbthreads/images/graemlins/cool.gif[/img]
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