Flashing codes, DDEC

[Sam 4106]

We have a 1990 8V92TA DDEC II. Three miles into a trip the engine lost power, but stayed running, and the check engine light came on. After a minute or more the engine resumed power with a jolt, and the check engine light went out. Instead of fuses, the ECM is powered through self resetting circuit breakers. My thought is that something shorted out in the wiring to one side of the engine, tripping the breaker. Then when the breaker reset, the engine started running smoothly again. I don't have a DDR or Pro Link so is there any other way to flash the code to help find the problem? I am reluctant to try to take the bus to a shop because I may not get there, and have to be towed.

I have been having problems with fuel filter plugging from Bio-diesel blend so I changed filters again in the event that was the problem. But the check engine light had not come on in the past when I had plugged fuel filters, so I don't think that is the problem.

Any help will be greatly appreciated. Thanks, Sam

[moosemanusa]

Can you pull the codes by holding down the engine override switch (if equipped)..

I dont have a DDEC 2 book on me but they usually say how to pull codes without a DDDL or prolink (cant reset, only read however)

[Jon]

I don't think codes can be accessed in the same way on all coaches. I certainly would try what was suggested, but if that doesn't work it might be easier to borrow a reader than try to figure out how a non standard engine swap was set up. The original coach was never a DDEC coach so there is no telling how the folks that installed the 8V92 set it up to flash codes if any.

Early vintage DDEC coaches had the reader plug in the steer bay, and using a jumper between the H and M pins would flash the stop engine light so if you can find the reader plug that might work.

[chessie4905]

I don't know if this is any use, but here:

http://constructiontractors.tpub.com/TM-9-2320-364-20-1/0726280212.htm

and here:

http://www.wanderlodgeownersgroup.com/forums/archive/index.php?t-16967.html

[moosemanusa]

no bad.. just google ddec 2 flash codes and the other fourms have the pin outs to flash the codes..

cant attach the image here, its over 50kb lol

[Sam 4106]

Hi guys,

Thanks for the posts. I tried the engine override switch to flash the codes, without any results. In reading the Wanderlodge forum I learned that jumping the A and M pins on the reader plug the codes will flash the CEL. There is a reader plug in the front electrical compartment and under the dash. However, the one under the dash isn't wired correctly so I will have to fix that before I can get the codes. Whoever wired the bus for the engine change and the house system wasn't too competent as I have had to fix a lot of problems. So I've learned to check the wiring against the engine schematic. Hopefully tomorrow I can get the codes flashed.

Thanks for the help, Sam

[luvrbus]

There are 2 versions of the DDEC II made by 2 different manufactures depending on which you have you may need the OBD cable to read with a prolink it may be wired right

[Sam 4106]

Hi guys,

After correcting the wires in the reader plug under the dash, I was able to flash the codes by jumping the A and M pins. I got these codes.   22 Throttle Pos Sensor Lo Volt     55 Proprietory Comm Link     58 Cruise Ctrl Switches     61, 63, 64, 65, 66, 67 all  Inj Response Time Long.                                                                                                                                                          

Can anyone give me some advise as to where to look for the problem(s)? Thanks, Sam

[luvrbus]

Check the 5 volt power supply to the TPS Gary just went through a deal where his ECM dropped the 5v to the TPS,work on code 22

[stevet903]

http://www.wanderlodgeownersgroup.com/downloads/DDEC_III-IV/22_Flash_Code_22_TPS_Low.pdf

http://trucktractor6x4.tpub.com/TM-9-2320-363-20-1/css/TM-9-2320-363-20-1_332.htm

Check the grounds for the ECM. The power connector is the top center connector - the two center terminals are ground, and the outside two on either side are 12V.

[Sam 4106]

Hi guys,

I finally got around to doing some testing on the TPS and the cable to it from the ECM. The only questionable thing is the voltage at the TPS is 4.77' but within the parameters of 4.75 to 5.25. I started the engine after testing and it runs smoothly. I didn't drive it because I didn't want to lose all the cool air in my shop. I guess I'll have to wait for a cool morning and take it out to see how it does at all positions of the TPS. Is it necessary to get the codes cleared right away? I don't know of anyone locally that can clear them for me, or is there a way to clear them without a Pro Link or similar device?

Thanks everyone for your help.

[Scott & Heather]

Sam what's the latest on this?


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[Sam 4106]

Hi Scott,

I haven't made any further progress since I am dealing with some health issues first. My guess is that I will have to change the ECM again, but want to be sure before I spend the money. I'm thinking the low volts to the TPS is caused by a faulty ECM but I want to have a professional test the system. There are no local mechanics, that I know of, with that capability.

Thanks for your interest, Sam

[moosemanusa]

Plenty of places online (will be cheaper) where you can send the ECM, they troubleshoot it and rebuild if needed..