Engine/Transmission (1998.5 - 2002) 3 cyl igh Idle then threw codes

[Deadbus]

Good day, folks.

The other day it got cold enough for my truck to go into 3cyl high idle, and then very promptly threw 6 codes. 0237, 1475, 0112, 0122, 0236, and 1693. The truck ran fine, but would go into a 3cyl high idle at 60F. Then this weekend, the truck started to buck, so I limped it home and replaced the APPS. I also cleaned the MAP and IAT sensors. I calibrated it and it is still throwing four codes (0237, 0122, 0112 and 1693) and bucking after clearing the DTC's.

I stack a SMARTY with an EDGE Comp.

I'm lost, any help would be greatly appreciated.

Very respectfully,

Vince

 

[JR]

First things first, get rid of the programmers to eliminate the possibility. Edges in particular are prone to failure as they age so disconnect and return to stock.

 

[Deadbus]

Can do. I'll remove the programmers at lunch. I should add that the truck is fine with Cruise control engaged, but not when using the pedal.

 

[JR]

You've definitely got some strange codes there. All are low voltage except the 1475 "Aux 5 Volt Supply Voltage High Sensor supply voltage for ECM sensors is too high. "

I'd also check all battery pos. and ground cables and have your batteries load tested. Multiple sensor voltage codes can point towards a bad ECM but the basics have to be covered before condemning the big ticket items.

 

[SnoKing]

So, if you live in San Diego, I do not think your truck went into high idle or 3 cylinder idle. It takes a good over night cold soak at around 28 degrees for high idle and has be be really cold (they say 15) for three cylinder to kick in. I only saw 2 cylinder a few times in Easter Washington in the winter where the truck was parked over night at 6 degrees or so.

I think you have an APPS issue, if cruise which is electronic on 02 works fine, but the pedal does not. SNOKING

 

[Deadbus]

Ok, all programmers are removed and the truck returned to stock programming. Same codes. Checked the batteries, connections are tight and no corrosion. I'm stumped. It all started with the 3cyl high idle. Another symptom, when the pedal wants to work, it will verrrryyyy slowwwwllllyyy creep up (doesn't matter if floored or partial throttle).

@SNOKING, I live in Montana now. Forgot to update my location. It was in the upper 20's last week.

 

[SnoKing]

Upper 20's will not trigger 3 cylinder idle. I think you have something else happening. To get into 3 cylinder idle the truck fires up, sits 20-30 seconds, slowly ramps up to 1200 RPM, waits a bit and then goes into 3 cylinder idle. Where the owner then has to clean his/her shorts the first time it does it! I takes a lot of outdoor over night cold soak to do either stage! SNOKING

 

[JR]

If your positive the batteries are at proper voltage and charging properly then it sounds like the ECM is going south. Check the big connector on it to make sure its tight and clean. Anybody around you have the same truck you could swap ECMs with?

You completely removed the Edge from your truck?

 

[Deadbus]

@SNOKING, it did exactly what it is supposed to do except at a higher temperature. I have had my trucks (I own 2-2nd Gens and 1-3rd Gen) in -40F before and am very familiar with what 3cyl high idle is. It went into the high idle at around 28F and then cut out 3 cylinders. Right after the three cylinders cut out is when it went into 3cyl, is when it threw all the codes the codes for the IAT and MAP. I cleaned those and reinstalled (also checked the R values). The truck then started to go into 3-hi at around 60, and then the APPS went south.

@JR, all three plugs of the EDGE are disconnected and the respective factory plugs replaced.

Charging system is 14.1vDC at idle and no grid heaters cycling. I did get a P1291, when the IAT and MAP codes first came in. The grid heaters were definitely cycling. I'm on the bus with bad ECM now. GRRRRR.... Unfortunately, no one to swap with. I took it to the ******* this morning. Peaceful drive, half mile to get to 35mph.

 

[JR]

Where is *******?

The only thing I can suggest is finding someone with a DRB or a good Snap On and have them run a scan. It would be worth the diagnostics charge to me before shelling out money for an ECM.

 

[AH64ID]

Let it sit overnight and then plug in a scanner (UG, SGII, DRB, etc) and see what your temp readings are on the IAT/MAP. They should be ±5° of the coolant temp.

I bet you find an outlier that is causing your issues. If they are all correlating then it's likely the ECM, as mentioned.

 

[dknoch]

I had an ECM failure a few years ago where the ECM would not recognize a signal from the APPS. Had a code for the APPS and replaced it with no luck.

 

[Deadbus]

Where is *******?

The only thing I can suggest is finding someone with a DRB or a good Snap On and have them run a scan. It would be worth the diagnostics charge to me before shelling out money for an ECM.

Interesting, I wrote dealer and it got autocorrected to *******. They've had it for 5 days. I think it's time to go collect it and take it to cummins.

 

[Deadbus]

Solved

Quick update: ECM toasted and so is the EDGE. Not sure if the one caused the other, but both are replaced. Thank you again!

 

[dknoch]

Glad you are fixed, wish it would have been something cheaper.