Code 51 means you have to
retrieve the real code from the computer.
Ignition switch should be on with engine off.
Locate the black RABS II diagnostic connector.
Disconnect the two halves.
Attach a jumper wire to the black with orange stripe wire side of
the diagnostic connector. Ground the jumper wire ground for a few seconds.
ABS lamp should start flashing.
Count the flashes. For example, three short flashes
followed by one long flash indicates diagnostic trouble Code 4. The
code will continue to repeat itself until the key is turned off. A code of 16 means normal
system operation.
The
last step of the system test always includes clearing the Keep Alive
Memory (KAM).
To do this, simply turn off the ignition while the
diagnostic connector halves are separated
Then
diagnostic connector should be re-assembled.
After getting the real code, then we can look it up and see what the 51 was trying to tell us to look for.
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