Is there a glow plug pid for scangauge. My voltage has been finicky lately and I'd like to know if I can monitor if my glow plugs are cycling when they shouldn't be.

 

Here is all I have for glow plugs.

Glow Plug Coil Time (Seconds)
TXD: 07E0221450
RXF: 046205140650
RXD: 3010
MTH: 000100080000
NAM: GPT

Glow Plug Light On
TXD: 07E0221667
RXF: 046225160667
RXD: 3201
MTH: 000100010000
NAM: GPL

Glow Plug Lamp On Time (Seconds)
TXD: 07E0221451
RXF: 046205140651
RXD: 3010
MTH: 000100080000
NAM: GPT

A single failed plug will normally set a CEL and a code. I've read a single plug code for #8 (some say #2) will sometimes be a bad glow plug control module.

 

I have a bad #2, no CEL. Now I have a bad #4 and #7 as well, changed module... still broke. Going after the harness and plugs next. I may put the old one back in and see if #7 clears, it coded with the new module.

 

Ok I don't have any cel but my charging voltage is sometimes erratic so I'm curious if the glow plugs are coming on when they shouldn't. If I watch the first pid you listed do you think I'll see a response from that of they were to come on sometime after completely warmed up? Would I be looking at a bad glow plug module or relay if this is indeed happening?

 

It would be worth a shot. You would see a timer reset if the PCM was commanding it to light them back up but if something is shorting or the GPCM is bad you might NOT see the timer come on.

Glow plug on time is dependent on oil temperature and altitude. The GPCM will
command the glow plugs on for 1 to 120 seconds. The GPCM does not operate
if the oil temperature is above 55C (131F)
Glow plug to ground 0.1~2 Ohms
Glow plug connector to GPCM connector Less that 5 Ohms

 

Normally, the WTS light in the dash lights up if the glow plugs are commanded on, if the PCM commands it. If the PCM is reset, it normally commands the WTS light as well.

Check it with the PID. Only way to know for sure.

 

Ok that's what I'll do. I've never seen the gp light come on after running but I'll check that pid
So i had my alternator tested couple days ago and results were good. No wild spikes in voltage. Guy ran it up to 190 amps and it still was charging at 12v. At 160-170 amps still charging right around 14.v. this was after it ran on the tester for 2 30 minute sessions. I feel confident my alternator isn't the problem.
Now I'm wondering if my scangauge is sketchy. I just got torque pro now just waiting on my obd dongle.

 

You won't see the little squiggly light come back on once the truck is running, however depending on temp, they(glow plugs) are still on. All that light does is tell you go ahead and try to start, after it goes out. One way to know for sure is get the PID for the glow plugs programmed, then look at the voltage right after it's running. You will probably not see much over 12V during the cycling, but once the plugs go off the voltage should jump back up to 13.5+......and at the same time the glow plug PID will go to zero.
My PID is the letters GPT, and the second it hits 0, the volts jump right back up to normal.

 

You could have had a loose alternator connection as well.

 

Nut, my truck does exactly what you described except sometimes it can't stay over 12v while the gp's are on right after start up. My main concern is that I often see these stupid swings in charging voltage after warm. Low 12v's to just over 15v.
I was unaware that the gp's could cycle anything under 131f. Maybe that's what is happening but it doesn't explain why I am seeing over 15v from time to time. On the tester we tried to induce it to have the swing by running amperage up high and then dumping it but the regulator seemed to control it just fine.

 

I wouldn't worry about the V's whilst the glow plugs are on, it's a big strain on the charging system and normal to have readings like that.

It is still possible the alternator is wigging out, a bench test of a few minutes might not equate to real world driving, although you would think it would perhaps do something under severe load as you described.

 

Well like I said it was on the machine running for 2 30 minute intervals and performed flawlessly.
One of my batteries is down 100 cca from spec so I'm curious if there is a bad cell giving my alternator fits.
All of this started since the temps have been averaging in the 20s.
Running torque pro may reveal my scangauge is bad but I'm gonna run the gp pid too

 

Can I put those values for the glow plug pid inn torque pro? I don't see glow plug monitoring in torque pro as a pre loaded pid.
So in just the first test drive with torque pro it seems my voltage is more stable than what my scangauge was showing. Gonna be watching it though for a while.
Is there a process to speed up the refresh rate of torque pro to real time?

 

So i looked at adding the gp pid for the timer into torque pro but it said to be certain to not make a mistake or damage could be done to ecu or something to that effect. So has anyone put the gp timer pid into torque pro before without issues? Just gave me a little concern when i saw that warning.
Also, I think my scangauge II is faulty. So i had been seeing voltage irregularities on it for a while which prompted me to get torque pro. Since watching voltage on it the voltage has been more stable and less erratic. I still get an occasional dip into high 12v range after gp initially go off while warming up but for the most part it's very stable around 13.8 to 14.1. I've never seen any voltage near 15v like my scangauge would periodically show.
So i want to monitor the gp on torque pro to determine if that's why I see the low voltage during warm up so any help with putting the pid on torque pro would help.
Now what to do with the scangauge. Anyone had any luck warrantying theirs?

 

It's possible your ScangaugeII is more accurate. The sample rate could be more or faster compared to the Torque app is through the Bluetooth.
There are settings for it on both.