No, all CA emissions with a relay have a shunt. That's how the PCM monitors current draw on each bank. A module monitors each glow plug individually and will set a glow plug specific code if one fails.

 

Sorry, I mistyped Module for Monitor.

 

Ca emissions? What does that mean? Looks like my Ex was manufactured in Louisville, Kentucky.

 

CA = California, as opposed to 49 state or Federal.

 

I get that Ca means California but are you saying my Ex is a California Excursion? Did Ford make California specific Excursions? I am confused. Because when I came here in 2012 it was the first time this truck had been in California.

 

The SuperDuty 7.3L TRUCKS (F-series) came in both Fed and CA emissions versions, depending on where it was sold originally. The EXCURSION was only offered as a CA emissions compliant model, regardless of original sale location.
I would imagine this was due to a much lower sales volume of the Excursion vs the F-series, as it was not economically feasibly to offer the 2 versions. On the other hand, the F-series was sold in huge numbers, including many commercial / heavy duty applications that would have been emissions exempt anyway.

Also, a number of other states have required CA emissions equipment for years. (NY, NJ, MA for instance). Unfortunately this is a symptom of the CA ultra-liberal, tree-hugging, wussy disease spreading and infecting the rest of the country. CA is such a huge market, that manufacturers bow to its rules/regulations, and then stick the rest of us with them for production cost and commonality reasons. Its kind the same way TX and its backwards religious based educational standards end up dumbing down textbooks for the whole country and filling them with religious half-truths and fantasy, in favor of actual scientific fact.

 

Why do you say his PCM isn't looking for one?

If a previous owner has replaced the GPCM that came on all 7.3L PSD Excursions without changing the PCM, then why wouldn't his PCM be looking for a module instead of a relay?

There were no 1999 MY Excursions ever made that were sold to the public.

I do know (thanks to Fat Diesel and Duck Fan) that California prepped F250/350 series trucks that came with the GPR (before Ford started using the GPCM) does have to have that shunt in order to keep the SES from activating.

Yes, but if you have a regular guy that you have used for years, and he knows his stuff, he won't care.

Oooo, I didn't even think of that! The OP can compare the hood sticker with the valve cover sticker to see if they match.

It did.

No 7.3L powered Excursion came with a catalytic converter.

They were all configured that way. Only the gassers and the 6.0's got the catalytic converter.

Not in Cali. CHP actually look for people trying to do this. I'm not saying it can't be done and is being done, just saying Cali actively looks for people doing this.

All PSD Excursions ever made (including the 6.0's) were all 50 state legal.

Please ease up on the name calling. I use People Republik too, but the state is far from scummy.

Only the F-series trucks had a difference where the 7.3L PSD powered rigs are concerned.

If you remember my previous post from earlier...

 

Wow Stewart, that a bunch 'o stuff. Yes, I remember you said that no Ex was made for California but I thought we all decided that NO Ex can have a GPR??? I think Pikachu said there were some 1999 and 2000 models that did and mine is a 2000 so could it be that it always had a GPR? I sent back the GPCM.

 

Because that code is specific to a relay w/shunt equipped vehicle.

Not all Excursions came with a module. Some had a relay. Also, if the GPCM had been removed and replaced with a relay, there would be a different DTC for failure to communicate with GPCM.

You're correct. I should have specified that as a production date reference.

 

So, what you are saying, if I might paraphrase Pikachu, is my Ex is likely factory and I have something bad on the right side of my engine whether it's one or more glow plugs, or any of the other miscellaneous items you mentioned? So is there a straightforward way for us to narrow down the problem on our own? My husband and I are willing to do the work, just don't have the expertise. Also, curious whether you buy into some people's belief that the PCM will throw a code if it senses a non-OEM glow plug?

 

Bank 2 is the left (driver) side of the engine, and yes, that's the side that's causing the code. You should start by pulling the outer wiring connector off the valve cover gasket and using an ohm meter to check the resistance of the glow plugs. In the socket on the valve cover gasket, there will be 9 pins. The front 2 and rear 2 are for the glow plugs. Check resistance from each of those 4 pins to ground. They will typically be about 2.0 ohms.

No, I don't believe just using non-OEM glow plugs will cause a DTC. I wouldn't use non-OEM glow plugs however, due to the fact that I've seen too many (particularly Autolite) glow plugs swell up and cause problems with removal, sometimes involving removing a cylinder head to take care of it.

 

Sorry Pik, I had forgotten about this thread until I read a similar GPCM thread just a few minutes ago.

I guess Ford might have made a ******* version for direct sales to government entities (anything is possible, I guess), but if they did, it had to be the first set of Excursions that rolled off the line.

The info from Ford has always been all 7.3L powered Excursions were 50 state legal and came with GPCM's.

Yeah, this mistake of mine was caused when my brain did not engage when I read the posted DTC by the OP, and mistakenly associated it with the P0683 no communication code for the GPCM.

Stewart

 

Interesting Stewart. But mine does appear to be original and I have no idea about it's life before me. Now we just have to relocate those youtubes on how to troubleshoot the issue. I really hate the idea of having to take it to someone but I may have to.

 

Hmm, I do habitually speed read when I scan threads and posts, but I thought Pik had you squared away on how to solve your problem, no?

Stewart

 

Yes sort of:
Bank 2 is the left (driver) side of the engine, and yes, that's the side that's causing the code. You should start by pulling the outer wiring connector off the valve cover gasket and using an ohm meter to check the resistance of the glow plugs. In the socket on the valve cover gasket, there will be 9 pins. The front 2 and rear 2 are for the glow plugs. Check resistance from each of those 4 pins to ground. They will typically be about 2.0 ohms.