1. The new P/N should be the same but incremented by one change level (i.e. AB -> AC, etc).
2. The new GCU should be incremented in change level.
3. The PWM works like a commanded percentage. For example, you send a 50% duty cycle to the GCU. It would then send to the glow plugs a voltage of (50%)*Battery voltage (let's say 12V) = 6V.
4. The CY p/n should be on the side of the case. If not, then...good question because it should be.

I called the dealer today and they couldn't find the flash update for the glow plugs. When are they going to get the flash at the dealers? I don't want to have to pay $450 for a tune I don't need to get update for glow plugs.

_________________
2006 Black Jeep Liberty CRD Limited
K&N, Samco Hoses, Michelin 245/70-16 LTX A/T2, Fumoto F-102, V-Force Muffler, Mopar, Hitch, Trailer Wiring, Skid Plates, Slush Mats, Rear Shelf, Predator Stage 1, Transgo, ORM & CodeReader, Facet 40109 Pump
"IT'S A DIESEL THING, YOU WOULDN'T UNDERSTAND"
Certified Services Auto & Truck Repair

Looks as an answer of advocate on a court - no answer Ok. How is the correct level must be labeled ? (AC? AD? AJ? AK? ...)

There is no any CY p/n on GCU. Only p/n BOSCH 0 281 003 034.



Same here. Nobody knows about funtom update.

_________________
KJ crd Sport 2006, Stanadyne FM100 (2 micron), inline lift pump, turbo-timer, 245/70/16 Dueler 694 A/T Revo.

Sounds like Chrysler is wiping out the inside of the Cup on the Golf Course Green with TP. After working for years with products from companies like Bosch 0 281 003 034 would be the first generation 0 281 003 034A (or B,C) would be the updated/revised versions. Saying that 0 281 003 034 is the new one with no suffix letter is pure Male Bovine Excrement!
If we don't need the flash to make the new glow plugs work and Chrysler and does not have it, they should be straight forward and let on.
When VW went through all this crap with their PD TDIs it all ended where the new glow plugs would work with the old flash and old GPC, the rest of the PD TDIs with the flash started like crap in cold weather. Not saying we can do the same, but those who put the new glow plugs into their nonflashed original GPC into their PD TDIs start OK.
I stuck with Ceramics when I replaced mine for now and let others Beta test on their dime.

_________________
2006 Pearl Green CRD
Magnaflow 2 1/2" Cat Back
KJ Extra Leg Room Brackets, Carter Lift Pump, V6 Airbox, ORM
Fuel cooler, Oil Separator, Progard 7
Gauges EGT Boost Trans Temp Oil Pres, Michelin LXT AT2 245 70 R16
7,000# Draw Tight hitch, PML EX Deep Trans Pan
Centrifuge, SunCoast, Transgo, RAM TCM, InMotion Stage 2
Wife's 99 TDI VW Beetle

Round and Round without any results, come on guys.

When mopar64 said aa, ab, ac, I think he was referring to the part number and any changes would be to the next sequential letter. Origional is aa, 1st change would be ab and so on....
The new glow plugs while appearing different have the same number.
Welcome to Chrysler Dodge Jeep Daimler Fiat Jeep!
If you do not see that our society is crumbling, time to wake up. A lot of people are on the verge of snapping.
Not us here on Lost Jeeps though. We are cutting edge, well, ok, some here are dull edge, especially me.

Lucky me, I have Green Diesel Hot FLashes in both tcu and ecu. So when Chrysler, Dodge, Daimler Fiat Jeep does a tranny glow plug mod, well, here I am Dull Edge Bob, All Ready.
Put me in Coach, I don't smoke!!!

_________________
'06 Jeep Liberty Sport CRD with: GDE Hot Flash and Tranny Flash, ehm, Cummins fuel pump, 3" Magnaflow muff, Moog K3199's, Skids, 225-75-16 10 ply, OME springs, Euro T/C, Shift kit, Trans cooler w/thermal bypass, Bigboy bkt, Samco CAC, Brake controller, Trans temp gauge, Al's Upper Arms

I feel like I've just stumbled into the twilight zone. People are surprised all of a sudden that Chrysler dealer service departments know NOTHING about a flash for our vehicles? This is a shock to you? When have the dealers known ANYTHING on the first try about the CRD? Mopar corporate is no longer the company that manufactured the Jeep Liberty CRD for the North America Market. That was another company entirely, the current company bears ZERO responsibility or liability for support of those previous vehicles. Keep repeating that to yourself, and you will eventually understand why they don't give a rip about us.

They view the TINY amount of support and parts that they are offering as a "goodwill gesture" that will encourage you (the hapless consumer) to shell out megabucks AGAIN into their pocket buying another one of the shoddy offerings they plan to push from the new company. Those CRD engines and those KJ chassis coming from the plant in America, with the SAME PARTS as our CRD, but a different non-05/06 model year? They don't exist for us, so says Mopar Corporate. "Those vehicles are an illusion, a mirage. And how do you know about them anyway, as they aren't meant for the USA market? The internet is wrong, those can't possibly be the same parts, as they have a different part number! 12345AB is LOTS different from 12345ABX! See, pitiful consumer? The number is different, it can't fit your engine! Even if it could, it might make your engine create .000001% more carbon dioxide, and that would be terrible now wouldn't it? You are better off just looking over here at this brand new $50k Hemi GAS powered Ultra-suck that we are selling now, and trade in that marketing experiment you have. Trust me, I'm your car dealer."

Ok, sarcasm engine off.

As for the glow plugs, I'm at 100k right now, with no GP codes (knock wood) and I'm taking a wait-and-see approach to this. Has anyone tried the metal plugs WITHOUT updating the rest of the system? Not saying that our system is the same as in the VW, but I'm less than encouraged by Mopar's ability to NOT screw up the computer flashes. I'm glad that I have GDE, but don't we need Mopar to do the flash for the plugs? I'd possibly be willing to try the plugs without the flash... OUTSIDE of my engine. Yea, I'm not taking a chance that one of them explodes inside a cylinder and trashes my engine before I know for sure.

_________________
Proud supporting vendor of LOST Jeeps
TRAVELING CRD TECH. I come to you!
Need help? Just ask! I've taken it apart more than most.
Email jeep [at] maincomputer [dot] com - BOARD MESSAGING IS BROKEN
Over 225 CRDs currently driving with my valves, timing belt, rockers, or ARP Studs.
Bad noises = REALLY bad things.

OK, I just picked up my glow plug kit and the news is not good. From what I got from the parts manager is he had to demand that they ship the parts from being held at the depot until June. They are supposed to get a large supply before releasing them to the dealer. Is this going to be a recall or customer satisfaction he is unaware.

The new glow plugs are clearly marked 5V as the old ones are marked 7.0V. I matched the GCU with the old one and looks exactly the same on the front as the old one, part numbers and markings right down to the Made in Malaysia at the bottom. On the side of the old one is part number 56044671AA and date code with the year first 05-06-09. One the side of the new one is part number 56044671AC (it was crossed out for some reason unknown) and date code with the year first 10-09-26.

Right now I'm letting the engine cool off so I can check the voltage output from both old and new GCU. I doubt I will get the 5V from the new GCU but if I do I will install the new glow plugs.

_________________
2006 Black Jeep Liberty CRD Limited
K&N, Samco Hoses, Michelin 245/70-16 LTX A/T2, Fumoto F-102, V-Force Muffler, Mopar, Hitch, Trailer Wiring, Skid Plates, Slush Mats, Rear Shelf, Predator Stage 1, Transgo, ORM & CodeReader, Facet 40109 Pump
"IT'S A DIESEL THING, YOU WOULDN'T UNDERSTAND"
Certified Services Auto & Truck Repair

The current supplied to the plugs is a pulse that fires 12 volt pulses to approximate the desired voltage, so depending on your volt meter, you may or may not get a relevant reading.
Check out both GPC units and see if there is any difference.
With the bosch numbers being the same, I have my doubts.

_________________
2006 Pearl Green CRD
Magnaflow 2 1/2" Cat Back
KJ Extra Leg Room Brackets, Carter Lift Pump, V6 Airbox, ORM
Fuel cooler, Oil Separator, Progard 7
Gauges EGT Boost Trans Temp Oil Pres, Michelin LXT AT2 245 70 R16
7,000# Draw Tight hitch, PML EX Deep Trans Pan
Centrifuge, SunCoast, Transgo, RAM TCM, InMotion Stage 2
Wife's 99 TDI VW Beetle

OK, I check both GCU and both put out the same voltage of less than 4V close to 3.5V when it settles. I don't know if the meter only reading half the voltage output but it is the same for both GCU. If the voltage is really 4V or below, it shouldn't damage the new glow plugs rated at 5V. If I'm only measuring half the voltage then there is an output of 7V that would burn the new glow plugs up. Can anybody verify the weather the voltage I measure is true reading or not?

_________________
2006 Black Jeep Liberty CRD Limited
K&N, Samco Hoses, Michelin 245/70-16 LTX A/T2, Fumoto F-102, V-Force Muffler, Mopar, Hitch, Trailer Wiring, Skid Plates, Slush Mats, Rear Shelf, Predator Stage 1, Transgo, ORM & CodeReader, Facet 40109 Pump
"IT'S A DIESEL THING, YOU WOULDN'T UNDERSTAND"
Certified Services Auto & Truck Repair

Know any one with oscilloscope? That is the only way to check the real Voltage output with the pulse signals.
Sounds like the GCUs are the same with the same voltage output as measured by the same volt meter.
If we had a test engine that was outside in the cold, the new glow plugs could be cycled on and off a few thousand times and see if they deteriorate with the current flash. With the metal shell over the heating element, even if it is ceramic; the debate as to weather or not the new glow plugs would fry may be academic.
Another test would be to put a metal glow plug into #1 or #4 location, use it as a test and see if it works with out the flash. With the metal jacket, it would be much less likely to crack the ceramic. If the jacket were tungsten over ceramic, it would be very tough and as the temp goes up the current would drop as the resistance goes up.

_________________
2006 Pearl Green CRD
Magnaflow 2 1/2" Cat Back
KJ Extra Leg Room Brackets, Carter Lift Pump, V6 Airbox, ORM
Fuel cooler, Oil Separator, Progard 7
Gauges EGT Boost Trans Temp Oil Pres, Michelin LXT AT2 245 70 R16
7,000# Draw Tight hitch, PML EX Deep Trans Pan
Centrifuge, SunCoast, Transgo, RAM TCM, InMotion Stage 2
Wife's 99 TDI VW Beetle

oscilloscope, you just woke me up.

The pulse voltage would of peaked at 7V and bottom out at 0V on an oscilloscope. Therefore since the voltmeter reads the average of peaks and valleys it would be about 3.5V. That explain my reading and if we were to hook up a 5V glow plug to it, we would let the smoke out of it.

_________________
2006 Black Jeep Liberty CRD Limited
K&N, Samco Hoses, Michelin 245/70-16 LTX A/T2, Fumoto F-102, V-Force Muffler, Mopar, Hitch, Trailer Wiring, Skid Plates, Slush Mats, Rear Shelf, Predator Stage 1, Transgo, ORM & CodeReader, Facet 40109 Pump
"IT'S A DIESEL THING, YOU WOULDN'T UNDERSTAND"
Certified Services Auto & Truck Repair

You need a true RMS voltmeter to correctly read the output.
Typical meters are calibrated for sinusoidal waves only.

You could plug an old glow plug into both GPUs and compare glow (ie. heat).

Short test on GP#1
GP 80041 (installed 30 Dec 2010 - ETC com in again 31 Dec 2010)
GCU CY p/n 56044671AC BOSCH p/n 0 281 003 034
PCM tune - latest according dealer info.
Temperature -10C
Cold engine: After key on - voltage 12v 3,5 sec, after that 3v 15 sec.
Engine t appr +10/20 C: After key on - 12v 1,5 sec, after that 3v 5 sec.

_________________
KJ crd Sport 2006, Stanadyne FM100 (2 micron), inline lift pump, turbo-timer, 245/70/16 Dueler 694 A/T Revo.

This is what I found online, we are both correct and incorrect for I don't know how pulse voltage and AC voltage relate to each other??

RMS Voltage:
RMS voltage is absolutely the most common way to measure/quantify AC voltage. It is also the most useful. Because AC voltage is constantly changing and is at or near the highest and lowest points in the cycle for only a tiny fraction of the cycle, the peak voltage is not a good way to determine how much work can be done by an AC power source (e.g. your amplifier, a wall outlet in your house...). DC voltage is constant. Its voltage level can be plugged directly into the formulas for power (on the Ohm's law page) and you will get an accurate image of its ability to do work. RMS voltage will give you the same ability to predict how much work will be done by an AC voltage. The RMS voltage of a pure‡ sine wave is approximately .707*peak voltage. If you read voltage with a voltmeter you are generally given the RMS voltage of the wave form. Some meters display an 'average' voltage which is very close to RMS. When reading voltage with a voltmeter, the display indicates the RMS or average voltage not the peak or peak-peak voltage.

_________________
2006 Black Jeep Liberty CRD Limited
K&N, Samco Hoses, Michelin 245/70-16 LTX A/T2, Fumoto F-102, V-Force Muffler, Mopar, Hitch, Trailer Wiring, Skid Plates, Slush Mats, Rear Shelf, Predator Stage 1, Transgo, ORM & CodeReader, Facet 40109 Pump
"IT'S A DIESEL THING, YOU WOULDN'T UNDERSTAND"
Certified Services Auto & Truck Repair

ha, sorry for this but would a TRUE RMS meter be accurate or not?

I have a guy/buddy (has his own shop) that had been dealing with my liberty and its wiring bull when it screws up a few times now. He has all the equipment and is really into the drivablility stuff I asked him to take a look at it and he said he is going to check into it for me. He has heard of the CRD glow plug problems already (to my surprise). Have not heard back from him yet. I'll let you know.

_________________
-05 Dark Khaki Limited CRD. GDE ECO tune. In-tank lift pump, Transgo doo doo kit, B&M trans cooler, replaced trans solenoid pack and filters, Newer Michelin tires, Timing belt with all related parts replaced at 110,000miles.

the glow plugs are going to be driven by a PWM ( Pulse Width Modulation) , it is still DC and not a/c you would need a Oscope to see it

_________________
05 liberty CRD Limited - suncoast TC , GDE Turbo , GDE TCM Tune 2gen OEM filter head, stant 195 tsat, Autoandart Window Fix, New TB kit ~190k (Geordi)
06 Liberty CRD Limited - stant 195 tstat Autoandart Window Fix, 2gen OEM filter head, New TB kit ~180k (Geordi), GDE Turbo, GDE TCM ECO tune

Reading glow plug temperature is still a viable option. I wonder if a non-contact temperature gun could do this.

x2...

Cycle both types of plugs out of the engine with an IR thermometer... if the metal one gets significantly hotter it would seem valid to me that it needs less voltage. That's about as sciencey as I'm willing to make it

_________________
Former CRD owner... now I just sit around and stare at the wall.

I have all kinds of thermocouples at work, you would think it would be more accurate with a contact thermocouple rather than inferred. BUT I don't have any old plugs and I wouldn't want to screw up the super hard to get new one's! so I guess I'm out ha.

_________________
-05 Dark Khaki Limited CRD. GDE ECO tune. In-tank lift pump, Transgo doo doo kit, B&M trans cooler, replaced trans solenoid pack and filters, Newer Michelin tires, Timing belt with all related parts replaced at 110,000miles.

The old glow plug is 7V and the new is 5V and will burn up.
I gave up and put one of the old glow plug back in. Thank You Fiat. Fix It Again Tony

_________________
2006 Black Jeep Liberty CRD Limited
K&N, Samco Hoses, Michelin 245/70-16 LTX A/T2, Fumoto F-102, V-Force Muffler, Mopar, Hitch, Trailer Wiring, Skid Plates, Slush Mats, Rear Shelf, Predator Stage 1, Transgo, ORM & CodeReader, Facet 40109 Pump
"IT'S A DIESEL THING, YOU WOULDN'T UNDERSTAND"
Certified Services Auto & Truck Repair