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Re: check engine light.
Unless you know the nuts and bolts of your truck, you are better off taking it to a garage, go through the yellow pages and get prices, I charge $20 to get the codes and turn off the light, others may charge more depending on the equipment they have.
I don't suggest jumping at the data link, if you are wrong your ecu is now toast, and that will cost you a lot more than a scanner hook up
What year is your truck, the pre-OBDII ford do not have the capability of storing a lot of the codes nor will they show live data that well.
What are the symptoms you are having?
a 6ya expert can help you resolve that issue over the phone in a minute or two.
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1 Locate the 16-pin data link connector. Connect the jump wire to terminals 4 and 9 of the connector. Turn the key to the "On" position without starting the engine.
2 Watch the "Check Engine" light. This light will begin to flash in specific patterns to indicate a 1- or 2-digit Diagnostic Trouble Code. The flashes will be long for the first digit, short for the second digit and blank if the digit is 0.
3 Record all the codes given. The "Check Engine" light will display the codes in sequence and then keep repeating them in order. Refer to your repair manual to check for the meaning of the codes.
in the engine compartment there is a small fuse box labeled ¨DLC¨ or ¨diagnostic¨ . Flip open the cap and on the inside of the cap is a chart of the terminals. use a paper clip or small jumper wire to jump terminals T and E1. then turn on the ignition switch to "on" but not start. The check engine light will start flashing codes. Example: two flashes, pause, three flashes = Code 23. the codes will repeat until you turn off the key or remove the jumper. Look up the codes online at a toyota forum or come back here with the codes and we'll tell you what they mean. Don't forget to remove the jumper before starting the engine.
Jump the >A+ B terminals and Watch Check Engine Light, it Will Flash Codes, First One will be Code 12 1 Flash> Pause then 2 Flashes. and if there are Not Any it will Keep Flashing Code 12. < Code 12 is a Confermation Code that Shows #1 that you are IN ECM CODE READ MODE, and It Also Conferms the "END" of Read Session.
This is not possible without an error code reader
Unless you have check engine or service engine light
Then you can hotwire the port for connecting scanner and it will flash the code to you using the check engine light on dash
But its quicker to use a reader. Different car models you can get to flash codes to you contact you car dealer to enquire about it.
The Check Engine light will light when the ECU stores a trouble code.
Counting the Flashes
To retrieve trouble codes, turn the ignition key to the "on" position with the engine OFF.
The Check engine light will flash many short blinks. The total number of blinks equals the code number. For example, flash,pause, flash,flash = code 12.If more than one code is stored, the Check engine light will flash the codes in sequence (lowest to highest) with a pause between each code. The codes will repeat until the key is turned to the OFF position.
Transaxle codes present
Diagnostic check only
Oxygen sensor circuit
Coolant sensor/high temperature
Coolant sensor/low temperature
PCM fault - pull-up resistor
6X signal fault (92-95 models)
Throttle position sensor-voltage high
Throttle position sensor-voltage low
IAT circuit low
VSS circuit-no signal
IAT circuit-Temp out of high range
Quad driver output fault
EGR system fault
MAP sensor - voltage out of range high
MAP sensor - voltage out of range low
IAC - rpm out of range
Ignition control circuit-open or shorted
Bypass circuit - shorted or open
IC control circuit grounded/bypass open
Knock sensor circuit shorted or open
O2 sensor indicates lean condition
O2 sensor indicates rich condition
Power steeringpressure circit(91 models)open or shorted
High idle indicates vacuum leak
PCM memory error
System voltage error
trans fluid temperature too high
Trans fluid temperature too low
A/C pressure sensor
ABS message fault
PCM internal communication fault
The problem you describe has NUMEROUS causes. Most common of these is a COIL is going bad. The RPM gauge gets its signal from the ignition coil/crank sensor circuit (could be either one OR could be the wiring between the engine control module (ECM) and the engine components. Does the Check Engine light come ON when this happens? Whenever the "Check Engine" light comes on, there is always a DTC (Diagnostic Trouble Code) stored in the ECM (Engine Control Module). You'll need an OBDII (On-Board-Diagnostics) scanner to retrieve any codes recorded/set in ECM. Once you do this and let us know what, if any codes are set, then we can go from there.
Yes you can use a piece of wire on the Diagnostic Link Connector and the Self Test Input connector.
The DLC may or maynot be labeled, but it is the top right position you connect to the STI to get the codes. Can be read with the Check Engine Light. I would suggest getting a service manual from a parts store to help with this diagnostic, it has the codes list.
Find the data link connector, w/ a paper clip, u have to jump terminals A and B, then turn key to on position, count check engine light for flashes. Count flashes to determine trouble codes. To see diagram of link connector w/ A and B terminal locations to jump, and list of codes, go to www.troublecodes.net/GM/