cOMPUTER WIRING AND LOCATIONS

[t-town]

Bought a 94 Bronco , Computer does not work , per shop,,, When starting the truck will not idel right away it dies and the 2nd time you start it it will run by it self but rough. Shifting is fun, at low ecelaration it shifts into 2nd and 3rd right away. Give it half troutle or more and it will wined out and put you in the back seat. I do not know locations of componets and would like to know if anyone can steer me in the right location to find a manuel that will have location and trouble shooting for the computer and motor componets. haynes is lame, it showes you nothing of locations for the computer.Truck has open conecters and may be missing some componets.

 

[Justshootme84]

Here's a link to Miesk5's Homepage, with tons of links to the tech info that may help you. welcome to bronco zone, JSM84

http://home.comcast.net/~miesk5/

 

[miesk5]

Here's a link to Miesk5's Homepage, with tons of links to the tech info that may help you. welcome to bronco zone, JSM84
http://home.comcast.net/~miesk5/

Thanks R!

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T-Town,

Here is da location..behind driver's side kick panel, above parking brake

Location pic in 87-96 Source: by Ryan M

Did the shop tell you if they checked for diagnostic troubles codes (DTC's)?

What components are missing?

Some could cause DTCs and the problems you are having. The shop should have told you this.

In my broncolinks.com site some of the componets are broken down into a few categories;

Ignition, Electircal & Fuel, as well as Transmission: Auto (such as E4OD) & Manual

In Electrical, I listed most under Sensor -nearly all have a Location Link; others may have a pic of where it is located.

FYI;

"Fail Code" conditions or "Limp Mode" happens when the vehicle computer recognizes a problem in it's logic. When an expected signal value from a sensor is sent to the computer and is not within the computer's programmed specifications, "secondary" programs are activated by the computer to strive to protect the transmission from damage the improper sensor signal might cause to occur.

In other words, the computer is always expecting certain signal values from certain sensors i.e. the temperature sensor, the speed sensor, the throttle position sensor, etc. As long as these signals are what it would normally expect for the conditions and is normal based on all the other signals it is receiving from other sensors, it acts normally and accordingly.

If the computer, all of a sudden, receives some crazy signal from one of the sensors that is out of the normal range expected from this sensor, it will go to "emergency" or "secondary" measures.

These emergency measures vary depending on the severity of the defective signal. All this is preprogrammed into the computer's logic by the manufacturer. The manufacturer has decided that as long as a certain parameter of a particular signal is sent from a sensor to the computer, all is well. The manufacturer decided that if this signal is higher than their highest parameter or lower than their lowest parameter, something is wrong with that sensor and the computer should make someone aware of the situation and take action to try to "save" the vehicle systems or powertrain.

Perhaps the computer will simply cause the "check engine" light to come on. The signal variation wasn't severe or critical to cause any mechanical failures but the vehicle's operator is made aware that he or she should have the vehicle checked out electronically to see if a minor sensor has broken down or is starting to send the odd irratic signal. This type of condition is commonly referred to as a "soft code". Normal functions are not affected but if the repair is not made, performance or fuel efficiencies might suffer. Perhaps the sensor only malfunctioned one time and all other times was fine. This might be an early warning of a sensor that is beginning to fail or has a loose connector or connection.

Other times the signal needed to perform operations normally is so far out of specification that the computer has no choice but to go into survival mode. With transmissions, the computer will cause the internal tranny fluid line pressure to default to high to protect clutches and bands. The transmission also turns off the shift solenoids to cause the unit to default to a single gear, usually second or third. All normal instructions to control line pressure are overridden so a hazardous "slipping condition" cannot occur easily. This theoretically is so that the vehicle's driver can get the damaged vehicle to the next town for repairs. This condition is commonly called "Limp Mode" for this reason. You limp to the next town in second or third gear only, at full line pressure so the tranny guts won't slip on your trip in.

By the way, interestingly and just as a side note, if the cable harness going to your transmission was ever to become detached, severed or damaged, your transmission would also go to "limp mode".

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This will take some time... Can you snap some pics of where the missing components are; or list them here? Also include pics of the connector & its pins or sockets view.

 

[BroncoJoe19]

Geeze Miesk5,

Your posts are so complete! You da man!

I was gonna just post pull codes and let us know what you get! /emoticons/[email protected] 2x" width="20" height="20" />

How to pull diagnostic codes

I've visited a couple of other forums, and IMO by far, people get more hand holding and specific, and accurate help here than at the other forums I have visited.

"I love this bar" hehehe... a little reference to Toby Keith.

 

[Justshootme84]

great info ,Miesk5 , that's why I just posted a link to your web page. T-town, i believe you can find a link there or else in the tech articles forum here at BZ where you can order a Ford shop manual on CD, might be a vendor or two on e-bay for those as well. Maybe miesk5 can elaborate/ JSM84

Look here:

http://broncozone.com/forums/index.php?showtopic=6458

 

[vincendebbie]

If you need a PCM or any other computer related equipment let me know. I have a 94 that I am pulling the motor out of and will be parting out the rest. --Vince