8V92 shutdown & multiple codes

[oldmansax]

First, engine has run perfectly until now. About 2 hours into this trip, the check engine light came on. Then went off. Then stated intermittently coming on during acceleration. Would go off when I reduced acceleration. Stopped at a rest area and looked things over. Everything was fine and the engine runs fine. Temp is about 190 with fan on. Cycles 190 to 195 with it off. Oil temp around 215. Pressure 15 at idle and 60 at speed. Boost, Pyro, fuel filter, power all fine. Voltage stays 12.8 to 14.2. No unusual smoke or sounds. Got to my stop for the night and checked codes using the Check Engine switch. I think I may have miss read some but these for sure:

13- Low Coolant 3 seconds
16-Low coolant sensor reading high
22- Throttle position too low?
32- Oil temp high for 7 seconds
45- Low oil pressure

43- Low coolant for 7 seconds
46- Low battery voltage

I'm thinking bad electrical connection somewhere? I haven't done anything to coach since last trip except replace a tail light bulb and change oil/filter in generator. I cleaned all the battery terminals about 4 months ago and have made 2 trips since then. They didn't look bad. Just preventive maintenance.


What ever happened started all at once and affects a lot of things so ECU Connections maybe?

I need to make this go away in the morning if at all possible.

Opinions/suggestions?

TOM

Edit: Corrected spelling in title. J. Wyatt

[Dieselbird01]

Hi Tom,

Just to gather more data, did you check the coolant level after it cooled down?

Note: that a dirty or stained coolant sight glass can make it difficult to confirm the coolant level.

[schamp]

Grounds grounds grounds! To many various codes makes me think that. My first place to look would be at the, ecm, what are you DDEC 111 or lV. My 1990 has a DDEC 2 and it has 3 power auto resetting breakers.

If you knew someone with an extra to plug in and test that would help to at least eliminate the ECM.

[Dieselbird01]

Originally Posted by schamp

Grounds grounds grounds! To many various codes makes me think that. My first place to look would be at the, ecm, what are you DDEC 111 or lV. My 1990 has a DDEC 2 and it has 3 power auto resetting breakers.

If you knew someone with an extra to plug in and test that would help to at least eliminate the ECM.

Seeing a bunch of codes doesn't necessarily indicate that they are active codes. Historical codes are displayed until they are cleared with a DDEC reader.

(Note: there is an exception... codes can be cleared on a DDEC I by removing power from the DDEC)

[oldmansax]

John, thanks for fixing title!

I did check coolant level and it's full. My glass is about 1/2 clear but I am aware of that problem.

I am thinking grounds too. Going to start checking connections this morning.

I know old codes stay for a while but the check engine never came on until yesterday.

I'm not in the middle of nowhere but on the outskirts. No code readers within 100 miles that I know about. That's on my purchase list.

This is a '95 8V92 so I thought it was DDEC 2? I thought DDEC 3 started in '96.

Changed plans to stay where I am today. Don't want to be stranded on the side of the road.

TOM

[oldmansax]

First I found out I do have DDEC 3 by reading this thread:
https://www.wanderlodgeownersgroup.c...ad.php?t=43217

I cleaned the major ground connections this morning, Bats to frame to starter. Bats to ground bar. Ground bar to isolation post on frame rail and all the smaller connections on it. Pulled the ECU connections on the driver side and sprayed them with electrical cleaner. They looked perfect when I pulled them. Pulled the one small connector on passenger side and sprayed also. It looked perfect too. Can't pull the large connector on that side because a shield connected to the thermostat housing is in the way. I tried slacking the bolts that hold it but they're not moving and I don't want to wring them off here.

Anyway, I fired her up and NO CHECK ENGINE LIGHT!! YAY! It could come back when I leave tomorrow but I'm hoping all is well. I did discover I failed to put my Proto 1/4" socket set back when I took it out of the bus. I know I should buy another one but I have had this one for 60 years and it just fits my hand...... I should just keep it on in the bus and buy one for the shop.

Well, we will see what happens tomorrow.

TOM

[Dieselbird01]

Originally Posted by Dieselbird01

Seeing a bunch of codes doesn't necessarily indicate that they are active codes. Historical codes are displayed until they are cleared with a DDEC reader.

(Note: there is an exception... codes can be cleared on a DDEC I by removing power from the DDEC)

Originally Posted by oldmansax

First I found out I do have DDEC 3 by reading this thread:
https://www.wanderlodgeownersgroup.c...ad.php?t=43217

I cleaned the major ground connections this morning, Bats to frame to starter. Bats to ground bar. Ground bar to isolation post on frame rail and all the smaller connections on it. Pulled the ECU connections on the driver side and sprayed them with electrical cleaner. They looked perfect when I pulled them. Pulled the one small connector on passenger side and sprayed also. It looked perfect too. Can't pull the large connector on that side because a shield connected to the thermostat housing is in the way. I tried slacking the bolts that hold it but they're not moving and I don't want to wring them off here.

Anyway, I fired her up and NO CHECK ENGINE LIGHT!! YAY! It could come back when I leave tomorrow but I'm hoping all is well. I did discover I failed to put my Proto 1/4" socket set back when I took it out of the bus. I know I should buy another one but I have had this one for 60 years and it just fits my hand...... I should just keep it on in the bus and buy one for the shop.

Well, we will see what happens tomorrow.

TOM

Hi Tom,

Having a DDEC III appears to change interpreting the codes.

GENERAL DIAGNOSTIC INFORMATION

As a bulb and system check, the Check Engine Light (CEl) and Stop Engine Light (SEl) will come on for five seconds when the ignition switch is first turned on. If the unit is programmed for the cruise control feature, the "Cruise Active" light (if equipped) will also turn on for five seconds.

If the CEl comes on during vehicle operation, it indicates the self diagnostic system has detected a fault.

When the diagnostic request switch is held, the diagnostic system will flash the yellow or red light located on the dash of the vehicle. The light will be flashing the code(s) indicating the problem areas. If the SEl comes on during vehicle operation, it indicates the DDEC System has detected a potential engine damaging condition. The engine should be shut down immediately and checked for the problem.

Active codes will be flashed on the SEl in numerical flash code order. If there are no active codes, a code 25 will be flashed.

Inactive codes will be flashed on the CEl in most recent to least recent order. If there are no inactive codes, a Code 25 will be flashed.

[1984Lodge]

I recently just did a repair for a DDEC issue and I believe it was the cannon plug that supplied power to the ECM. One of the pins was not locking into place. I was able to get the check engine light to go out but the customer reported some issues still with the light flickering still so I am going to have to do some more work on it. I did not have the pin tool for the cannon plugs so I was limited on what I could do. I am going to try to move the pin and plug to a different spot on the plug and see if that makes things better, if that does not work I am going to bypass the cannon plug.

[Alever]

The DDEC ECM is mounted on rubber isolator bushings to keep the case from being grounded. You could be getting some issues if that is grounding in some way. Easy to check with a meter from ECM case to ground with a meter.

[oldmansax]

We moved about 30 miles today. CEL stayed off for about 15 miles, then started going on/off, then stayed on. I don't have time to research this much right now but cursory searches indicate the sensor could be failing when it gets hot. Some people say the connector can be shorted to give the ECU a false reading until the sensor is replaced. Has anyone ever done that? The last thing I need now is to burn up the ECM. Coach still runs fine with no problems showing on the gauges or in operation. The first code that shows up is 13- low coolant. I have verified the coolant is not low by removing the radiator cap & looking while the light is on. I know, "Don't do that it's dangerous" Yes it is but it can be done. I ordered a new sensor anyway.

I did see a reference to a Coolant Sensor Module but I don't think that was on the 92 series, Just the 60 series.

Ideas/suggestions/opinions?


On another note, the leveling system now works great! Thanks to me fooling with it, "and a little help from my friends!" Randy & Max!


Thanks!

TOM