1993 Trouble Codes

[homebuilder]

How do I read trouble codes for a 1993 Bronco? There does not seem to be a computer input.

Thanks.

 

[miesk5]

yo!

Self Test & Connector Location & pics, Bronco & Ford BEST PROCESS WITH DIAGRAMS! Source: by Ryan M (Fireguy50)

post codes here when you run the test.

 

[homebuilder]

How do I read trouble codes for a 1993 Bronco? There does not seem to be a computer input.
Thanks.

I have 1 KOEO code = 122 or TPS circuit below min. 0.6 volts.

The engine problem I have is high idle of 1500 rpm in park, but a good idle of 1000 rpm right after shifting to drive.

The Bronco is a 5.8 liter.

Should I replace the Throttle Position Sensor?

Thanks.

 

[miesk5]

I have 1 KOEO code = 122 or TPS circuit below min. 0.6 volts.
The engine problem I have is high idle of 1500 rpm in park, but a good idle of 1000 rpm right after shifting to drive.

The Bronco is a 5.8 liter.

Should I replace the Throttle Position Sensor?

Thanks.

yo!

The following is a list of vehicle symptoms which have been associated with the TPS, but can also be related to other vehicle components.

Check engine light

Stalls/quits

Hesitation/stumble

Fast idle

So 122 = a cleanng of TPS, ck the connector and it's blades, etc.

Throttle Position Sensor(TPS) Test in a 92 (loosen the 2 Phillips screws until voltage is less than 1.0 volts @ idle (.97 volts) Source: by Richard C (Bigric, Money Pit) at SuperMotors.net

Throttle Position Sensor (TPS) DTC Codes 122 through 125 Troubleshooting & Possible Causes;

"The TPS is located at the end of the throttle shaft on the throttle body. Using the TPS voltage signal the EEC determines fuel delivery based on throttle position. A bad TPS can be the cause of bad idle, which is caused by the injector pulse fluctuating. Some loss in performance can also be expected.

Codes 122 through 125 are present when the EEC detects a TPS problem.

Sensor Safe carb cleaner or TB cleaner can be used to clean the sensor. If the problem persist replace it"

Throttle Position Sensor(TPS) Function & Diagnosis TSB 94-26-4 by Ford for 93-95 Source: by miesk5 (Al M)) at comcast.net

Read the VOLTMETER section - "MANY VOLTMETERS WILL AUTOMATICALLY CHANGE RANGES WHEN MEASURING TPS OUTPUT FROM IDLE TO WOT. WHEN A VOLTMETER IS USED TO MEASURE TPS OUTPUT FROM IDLE TO WOT, THE METER SCALES OR CHANGES RANGES AUTOMATICALLY. THERE MAY BE AN ERRONEOUS METER DISPLAY UNTIL THE VOLTMETER HAS LOCKED TO THE APPROPRIATE VOLTAGE READING. THE ERRONEOUS METER DISPLAY DOES NOT REPRESENT A DEFECTIVE TPS.

NOTE: IT IS RECOMMENDED THAT THE "RANGE LOCK" FEATURE ON MANY METERS BE SET FOR CHECKING TPS VOLTAGE.

Use the 0.00 range to measure TPS voltage.

If your voltmeter does not change ranges automatically and the meter is set to millivolt scale when reading full range voltages, the meter display may not indicate a valid value. This can be misinterpreted as an open circuit or suspect TPS. Ensure the meter is set to volts for measuring full range voltage levels.

CAPS are Ford's, not mine...lol

 

[homebuilder]

I replaced the TPS and all was good. Idle was perfect in park and drive. Drove the truck a few miles, and Check Engine again.

Did a test, got KOEO = 111 (system pass) and CM = 322. Reset the computer, and test drove.

Did another test and got only KOEO = 123 and CM = 123 (TPS again, this time voltage exceeding 4.5 volts).

I am stumped. High idle is back in park.

Thanks in advance for any advice.

--Kevin

 

[miesk5]

I replaced the TPS and all was good. Idle was perfect in park and drive. Drove the truck a few miles, and Check Engine again.
Did a test, got KOEO = 111 (system pass) and CM = 322. Reset the computer, and test drove.

Did another test and got only KOEO = 123 and CM = 123 (TPS again, this time voltage exceeding 4.5 volts).

I am stumped. High idle is back in park.

Thanks in advance for any advice.

--Kevin

ok K,

This is in that TSB;

TPS circuit concern when accompanied by Codes 122 or 123.

BP sensor low see Testing below

TPS circuit concern when accompanied by Codes 122 or 123.

BP sensor high.

These codes are designed to set while in the part throttle drive mode, and often the MIL light flashes on and off until the condition is gone. In some cases, it is difficult to repeat the codes in a test drive since the PCM requires a long drive time to calculate the error in the system. At other times, it may be difficult to repeat because the condition that set the code may be intermittent. Pinpoint Test G of the PC/ED Manual will guide you to the root cause.

Causes of EEC Codes 122: TPS sensor circuit voltage above maximum.

Causes of EEC codes 123: TPS sensor circuit voltage below minimum.

Harness damage.

Connector damage or water in connector.

Defective TPS, open or short.

Check VREF for correct output. VREF - Vehicle Reference Voltage

Testing the TPS in the vehicle electrical circuit:

The TPS is supplied with a 5.0 volt reference signal. As the TPS senses throttle plate rotation, the output voltage changes to a value in the range of 0.4 volts to 4.8 volts depending on vehicle application. A voltmeter, New Generation Star Tester (NGS) or Service Bay Diagnostics System (SBDS) is the recommended test equipment for checking the TPS output.

The reason SBDS or NGS are the preferred tools is that they allow TPS voltage monitoring without disturbing the connector. Many conditions can be caused by loose, dirty, oxidized, or poor connections that may correct themselves for a short time if the connector is disturbed during testing. This can mislead technicians into replacing a TPS that is okay, and the true cause, a bad connection, may return at some future time.

Sensor, Throttle Position (TPS) Testing & Operational Description & Parameters (click on Sensors) Source: by Ryan M (Fireguy50) at fordfuelinjection.com

esp. "...All of the following items will affect the TPS: