Well this sucks!

CGman · **Posted:** Sat Apr 06, 2013 9:24 pm

Just getting the Jeep put back together after the skid plate and fumoto valve install and now she's refusing to start! :banghead:

Plenty of battery, just not firing at all, here's the codes showing:

P0047 – boost actuator short circuit to ground
P0091 – fuel inlet metering unit short circuit to ground
P1251 – vac on/off solenoid short to ground
P2120 – accel pedel 1 plausibility and source
P2295 – PCV, rail pressure control valve, short to ground

There was one old post where their Jeep sat for a week and didn't want to start, any ideas?

ATXKJ · **Posted:** Sun Apr 07, 2013 7:33 am

Well - most of your codes say short to ground - I'd be looking for a wire that's cut/damaged and the work just cleaned up/wiggled a connection.

since it is an 06 - one of the issues was that they had moved the fuel head to accomidate the ESC pump - and it rubs a wiring bundle there.

that's where I'd start looking.

the other common 'no start' is the actuator linkage on the key switch - but it normally doesn't have codes.

CGman · **Posted:** Mon Apr 08, 2013 11:34 pm

Well, checked wire harness from ECM to engine, can't find anything but a very small nick in the overbraid material behind the fuel filter.

Also swapped ASD relay with another, that didn't help.

Un-did the ORM (reinstalled the plug) and now I have a P2141 code showing.

Would a fuel system problem cause all of these messages? (I had maybe 1/8 tank of fuel, BTW)

Has anyone ever had an ECM go bad?

Any strange security cutoffs that would disable the fuel system that would not reset with the normal key?

racertracer · **Posted:** Tue Apr 09, 2013 3:55 am

Try resetting it, reboot the system. Remove the battery terminal and leave it sitting for 5 minutes or more, then re-attach.

Auberon · **Posted:** Tue Apr 09, 2013 4:42 am

x2
Just keep in mind before you go looking at ECU replacement - ECU is pretty robust. That one is way down the list of to do's.
I hope you don't mind these suggestions from across the world.
I'd start here:
Keep in mind:
One thing that can cause a non-start (over that post re starter etc) is the cam position sensor - it is a Hall effect device and lets you keep on trucking until you stop. A code may not have been pending. Easy electrical check at the basic level....you can use a scope but a DMM will do for a field test. It is on LHS rocker cover at the rear.
It is a Hall effect sensor that lets you run until a switch off. Then it will deny run after switch off.
I know its not directly linked to those codes.

Good question re fuel but the 1/8 tank should still provide it.
To check:
If you can bleed it - it will at least not be fuel as it will pull through for a kick over and a short run.
This will also let you determine if air in the fuel head is a contributing factor.

All of those codes are grouped around fuel and air metering.
It could be directing the "to ground" as if there is no signal many sensors go to 0V of the 5V rail.
It would also suggest a check of the state of the MAP and MAF....logic predicates that these could induce the type of codes to show if you are getting no data from them.

These are the two primary sensors (I know there is more to check but I aim at a starting "zone") linked to those codes that can be easily checked for function just by cleaning.
That's all I can suggest for now with just that little bit of info from across the world.

Good luck.

Billwill · **Posted:** Tue Apr 09, 2013 7:15 am

I agree with Auberon.....the ECMs are pretty robust. Worth disconnecting the battery and re-plugging the connectors on the ECM though.

Did you remove the mounting bracket that holds the fuel filter in place?....behind that bracket is where wires could be chaffed through.

Try adding some fuel and make sure the fuel head is well primed and has no air in it.

Try jumpering out pins 30 and 87 of the ASD relay and see what happens...I had a bad wiring issue in that area causing a no-start situation but it did have the SKIS light on solid at the time.

CGman · **Posted:** Tue Apr 09, 2013 2:53 pm

will the engine start with the FCV failed in the closed position?

how long is too long to crank the engine to clear out possible air in fuel lines

CGman · **Posted:** Wed Apr 10, 2013 1:43 pm

Is it just me or have there been at least 3 people with CRDs that crank but won't start on here lately? Two had code readers and one did not.

The consensus is to check fuel filter/air in lines or wiring problem, but that doesn't account for the similiar codes shown by both my CRD and jinstall. :?:

What was the final fix in his case? Looked like ECU replacement if I read correctly.

ATXKJ · **Posted:** Wed Apr 10, 2013 9:07 pm

Jinstall's problem was a clueless dealership and he didn't have enough time to work on it....

it intermittently died and then ran perfectly - dealership could not reproduce the problem

he traded it in.

(FYI - there are a lot of folks who sign up for LOST because of the CRD troubleshooting - if things are running fine - they don't log in - so problems reported are not representative of any larger group - just the nature of LOST)

CGman · **Posted:** Sun Apr 14, 2013 11:37 pm

Well, I'm waving the white flag and sending the ECU to GDE to see if Keith thinks it's fried.

Tonight's work:

- Remove and replace TCM with GDE tune - 35 minutes

- Remove top two and bottom rear ECU fasteners - 10 minutes

- Remove fwd bottom ECU fastener and remove ECU from sidewall - 1 HOUR! :dizzy:

- If I ever meet the guy that designed and put that wire harness there I'm going to give him a piece of my mind! :furious:

flman · **Posted:** Mon Apr 15, 2013 7:00 am

Did you have it on ramps to do the skid plate? My sport did not want to start after I replaced the engine mounts, and it was air in fuel. I put the shop vac exhaust into the fuel filler neck to pressurize the system and opened the bleeder till it was clear, then it started fine. You did say you had 1/8 of a tank, which says it would be very easy to lose prime if the front was higher then the back?

CGman · **Posted:** Mon Apr 15, 2013 1:17 pm

it was up and level most of the time, but it was nose high for awhile...thanks for the advice

Well this sucks!

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