Question about 1991 Ford F150
You have a problem with your Rear Antilock Brake System (RABS) Your system outputs flash codes and all that is needed to retrieve the cods is a jumper wire.
Locate the RABS diagnostic connector. It is located in the main wiring harness on the driver's side just rearward of where the wiring harness goes through the firewall. (See the attached illustration) It is a single pin connector and has a black wire with an orange stripe. To get the codes, ground this wire with a jumper wire momentarily with the ignition in the "RUN" position. Watch the RABS warning light. It will start flashing.
To read the code, count the flashes. The code consists of several short flashes and ends with a long flash. Count the long flash as part of the code. For instance, if there are 4 short flashes and 1 long flash, then the code is 5. It is recommended that you read the code several times to make sure you are reading it correctly. The code will repeat itself until the ignition switch is turned off.
The trouble codes are as follows:
Code 1 (This is not a valid code)
Code 2 (open isolate circuit)
Code 3 ( open dump circuit)
Code 4 (closed valve switch or open dump valve)
Code 5 (system dumps too many times)
Code 6 (speed sensor signal rapidly cuts in and out)
Code 7 (no isolate valve self-test)
Code 8 (no dump valve self-test)
Code 9 (High sensor resistance)
Code 10 (Low sensor resistance)
Code 11 (stoplight switch circuit)
Code 12 (fluid level switch closed during a stop)
Code 13 (speed sensor check)
Code 14 (program check)
Code 15 (memory failure)
Posted on Jan 16, 2011
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Posted on Jan 02, 2017
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