I have a 92 bronco with a 5.0 that is a 96 motor. It runs great but won't pass emissions. I got the codes read and it came back with 7 different codes.

CYL: 8
DTC: 412
DTC: 311
DTC: 332
DTC: 538
DTC: 536
DTC: 632

I would like to know what they mean and what the fixes might be. Thanks

 

A 96 engine in a 92... were the electronics from the 92 retained when the engine was installed?

Code 412 - RPM control could not be maintained during KOER high-rpm test.

Code 311 - Thermactor system inoperative during KOER.

Code 332 - Insufficient EGR flow detected.

Code 538 - Technician failed to perform "goose test during KOER.

Code 536 - Brake On/Off switch (BOO) open or shorted to negative (ground).

Code 632 - Technician failed to disengage and re-engage overdrive during KOER.

So, Codes 536, 538, and 632 are things that didn't get done while the KOER test was being performed. The "goose test" requires the technician to increase the engine RPM to 2000 and maintain it for 10 seconds. This gets done immediately AFTER the first SINGLE FLASH of the CEL. You have ten seconds to perform the goose test, turn the overdrive off and back on, and step on the brake pedal and release it. Failing to get any of these things done will trigger corresponding Codes. This DOES NOT negate the test results. It does mean that certain dynamic changes cannot be tested by the ECM that would normally be done during the KOER test.

Code 412 is one of the Codes that will trigger as a result of the goose test not being performed as the ECM is unable test engine RPM control at the high-end because the RPM's never reached the 2000 rpm minimum for the test.

Code 311 is indicative of several possible failures but the first thing to check is vacuum to the TAB and TAD solenoids along with the vacuum to the EGR valve and the diverter valve behind the passenger side cylinder head.

When you add Code 332 to the previous Code you have to ask yourself if the smog pump is indeed pumping air and/or if the diverter valve is working or getting vacuum as it is supposed to and when it is supposed to. (This is controlled by the TAB & TAD solenoids so don't just go running an arbitrary vacuum line to the diverter). Do make certain all vacuum lines are intact. IF all vacuum lines are intact and the Code still rears its ugly head, there is a slightly tedious method of testing the TAB and TAD solenoids that I can walk through with you.

Of all the Codes listed, 311 and 332 are the two you should truly concern yourself with. The rest are a direct result of the "goose", overdrive lockout, and brake tests not being performed during the KOER test.

This might help in determining future Code meanings. Your truck obviously produces three-digit Codes and not two-digit Codes.

Hope this helps. If you need more detailed troubleshooting for the specific devices I've mentioned here, just say the word.

GS92

 

i pulled codes 725,386,and 321 on my 94 bronco.can anyone tell me what they mean? The truck has no low end power,sluggish on inclines.....

 

Ford OBD-II Trouble Codes

http://www.check-engine-light.com/trouble-codes
Hopefully this will help someone in the future.

 

Lets hope so or he's got some work to do.

 

thank you sooo much

 

You are quite welcome. The poster above me ^^ greystreak 92 I have never met or corresponded with, but it is obvious he knows what he is talking about. I am just a backyard mechanic who keeps my own vehicles running with some help when needed from a friend of mine who is an ASE certified mechanic with over 40 years experience. If it has a carb,points and condensor I can diagnose and repair it. If it is OBD I sometimes need some help. You can get all the help you need on here if you are polite and ask the right people, such as greystreak.