ABS Pump Failure? - 94 Ford Explorer XLT 4WD

[HKAWolf]

94 Ford Explorer XLT 4WD - Mileage 118K
No major repairs. Minor repairs: (1) water pump, 75K; (2) heater relay switch, 105K

Three weeks ago, my Explorer had check engine light come on. Multiple error codes from all different components that could not be read using EEC-IV hub under the hood, but manually extracted with self-test mode off utilizing blinking "check engine" light -- long story short... replaced ECU with remanufactured Ford computer and no problems with ECU or electrical system since (runs better than when new).

Now, one week later yellow ABS warning light on intermittently (ABS light comes on when cranked, then off, then on when in motion - i.e. no software issue) only in late afternoon and never in morning and may go 4-5 days with no ABS light on at all. I have checked fuses, connections, grounds, master cylinder fluid level -- all normal.

Checked ABS codes at a trusted mechanic shop: only one code (63) ABS Pump/Motor Failure, not wheel speed sensor as I suspected.

Question:
Is this possible or even probable? Could it be a bad relay? I do not want to spend $1000 to replace ABS Pump/Motor assembly on a vehicle worth $1500, and, if necessary, I will probably continue to drive it without ABS working and forego the expense. Please help me with this...

No one other than mechanic replacing ECU has performed any work on this vehicle and, to my knowledge, it has not had any energy surge (i.e. lightning). I'm clueless regarding why this has happened.

[way2old]

The relay is a good possibility. It is easier to test it and replace than the pump motor. If the relay is starting to get weak, it could cause the problem.