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21-01-2023
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MonsterMoose
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Join Date: Apr 2005
Location: QLD
Age: 70
Posts: 8,889 What Jeep do I drive?: WK2
Likes: 4,423
Liked 3,945 Times in 2,329 Posts
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Quote:
Originally Posted by layback40
Do they have mechanical relays in the WK? The KJ uses power transistors & 5v GP's. I think Chrysler had all the geeky engineers in a group trying random ideas in the KJ. There is an OBD number for each GP.
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Never checked, just know this thing that looks like a relay on steroids is for the glow plugs.......... P0670 to P0676 are glow plugs .. the glow plugs run on 7v not 12v so the bible says.
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2015 WK2 CRD Laredo( ZG, WG 2.7 )
Your Never Too Old To Learn Something Stupid.
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21-01-2023
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Grumpy Old XJ Dsl Owner
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Join Date: Jan 2011
Location: Northern Victoria
Posts: 13,844 What Jeep do I drive?: XJ
Likes: 4,613
Liked 6,579 Times in 4,357 Posts
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Quote:
Originally Posted by drover
Never checked, just know this thing that looks like a relay on steroids is for the glow plugs.......... P0670 to P0676 are glow plugs .. the glow plugs run on 7v not 12v so the bible says.
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I think you may find that relay on steroids is full of electronics. No mechanical relay to be found. They use power transistors to switch the power on to each GP. It may even pulse 12v to get an average of 7v. Makes fault finding with a multimeter very hard.
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98&01XJVMs,06&07KJCRD's,No longer question authority,I annoy it.More effect,less effort.10000Club
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21-01-2023
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MonsterMoose
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Join Date: Apr 2005
Location: QLD
Age: 70
Posts: 8,889 What Jeep do I drive?: WK2
Likes: 4,423
Liked 3,945 Times in 2,329 Posts
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Quote:
Originally Posted by layback40
I think you may find that relay on steroids is full of electronics. No mechanical relay to be found. They use power transistors to switch the power on to each GP. It may even pulse 12v to get an average of 7v. Makes fault finding with a multimeter very hard.
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Going on the rest of the vehicle I would assume not mechanical at all, the WSM does detail resistance checking for the plugs both in situ and on bench but if no codes being thrown to me it points to further down the chain than the actual units............
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2015 WK2 CRD Laredo( ZG, WG 2.7 )
Your Never Too Old To Learn Something Stupid.
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04-07-2023
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Senior Newbie
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Join Date: Jul 2020
Posts: 59 What Jeep do I drive?: WK2
Likes: 20
Liked 17 Times in 10 Posts
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Just an update on the glow plug light issue. Had my car serviced at a Jeep dealership and asked about the glow plug light intermittently continuing to flash. A $90 diagnosis charge later, they tell me there is a fault code for the glow plug in cylinder 3 but they tested that glow plug and it seems fine. They also checked the wiring connections and they were fine.
After the service they said if I still get the glow plug light flashing it will require a more in depth diagnosis. However, I don't really trust the dealership's expertise. It will probably cost a lot for no real answers or replacing a lot of parts unnecessarily.
Any suggestions what could be the cause? It doesn't seem to affect the operation of engine.
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2013 (2014 MY) Grand Cherokee Diesel 8 speed
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04-07-2023
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MonsterMoose
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Join Date: Apr 2005
Location: QLD
Age: 70
Posts: 8,889 What Jeep do I drive?: WK2
Likes: 4,423
Liked 3,945 Times in 2,329 Posts
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MAP sensor may need a clean ............. maybe some injector cleaner put through the system, Moreys or Fuel Doctor could be just coked up a bit......... if all is running okay then Ostrich technique, ignore it ( It would drive me nuts actually) could always swap it for one of the other ones, if the fault changes spots then you know its the GP if it doesn't you know its a gremlin in the system..........
Once had a fault in a Ford, took a chance on it being the MAP sensor or something like that, went to a mates place as he had same model, once I had calmed him down and swapped the part mine ran good again and his played up, he was pale so I swapped it back and he had a smile then went to Repco for a new part and saved heaps of $$ compared to the genuine part which by the way came in the same plain box and label.
__________________
2015 WK2 CRD Laredo( ZG, WG 2.7 )
Your Never Too Old To Learn Something Stupid.
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04-07-2023
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Lowranger Shocker
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Join Date: Jun 2009
Location: yamba 2464 nsw
Posts: 1,594 What Jeep do I drive?: WH
Likes: 522
Liked 844 Times in 472 Posts
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Quote:
Originally Posted by chooke
Just an update on the glow plug light issue. Had my car serviced at a Jeep dealership and asked about the glow plug light intermittently continuing to flash. A $90 diagnosis charge later, they tell me there is a fault code for the glow plug in cylinder 3 but they tested that glow plug and it seems fine. They also checked the wiring connections and they were fine.
After the service they said if I still get the glow plug light flashing it will require a more in depth diagnosis. However, I don't really trust the dealership's expertise. It will probably cost a lot for no real answers or replacing a lot of parts unnecessarily.
Any suggestions what could be the cause? It doesn't seem to affect the operation of engine.
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My sons 2014 has had the glow plug symbol flashing on off now and again for
years.No crook glow plug code until just recently !
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04-07-2023
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CrawlerStar
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Join Date: Sep 2020
Posts: 481 What Jeep do I drive?: WK
Likes: 0
Liked 352 Times in 184 Posts
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It will be a faulty glow plug. Car will still run and drive but whilst it has outstanding code it will not do dof burns.
Mine said it was glow plug 4, changed that but the fault remained, changed number 5 plug and fixed it.
They are not easy to remove and very easy to snap as i found out.
My advice, just change the faulty one- if you can get it out !!
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