Glow plug problem?

SEAND35

MEMBER
2007 CHEVROLET SILVERADO
124,000 MILES

Origianaly had two codes one for glow plug one and this guy.
this is a 2500 HD with a duramax diesle engine. Checked for and found 12 volts at the air intake heater, replaced it with a new one erased the code and it just came back with only two key cycles and ten min run time. The glow plug control modual has been changed out as well with a new part. Is there a relay that controls this unit? I know the older ones had a set of relays working in paralel but I have found no fuse or relay for this newer model truck. Do you have a trouble flow chart for this diagnostic?

5 Replies

RIVERMIKERAT

MECHANIC
6,110 POSTS

Hello,

The P0540 OBD-II Trouble Code: Intake Air Heater "A" Circuit here is the wiring diagrams so you can see how the system works. There is a mega fuse on the right side of the fire wall 175 amp that heat up and melt the connections I would check there.

This guide can help

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (Below). Please let us know what happens.

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Sunday, December 4th, 2011 AT 4:27 AM

SEAND35

MEMBER
7 POSTS

Do you have a test for the intake air heater? What is the pin out for the plug? Also can you find the 175 amp fuse do you know where it is at?

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Sunday, December 4th, 2011 AT 4:57 AM

RIVERMIKERAT

MECHANIC
6,110 POSTS

Here is the mega fuse location please check the connections. Check out the diagrams (Below). Please let us know what you find.

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Sunday, December 4th, 2011 AT 5:42 AM

SEAND35

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7 POSTS

Thanks its just like you said the fuse was melted do to what so I get a new fuse holder and install it all fixed! Thanks for your help this site is the best!

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Sunday, December 4th, 2011 AT 7:25 AM

RIVERMIKERAT