Can't get DRV8434S to fault on OL

I have the DRV8434S working great with a stepper motor, using the Arduino driver. The only problem I have is detecting a disconnected motor. I cannot get the OL bit on the FAULT register to set when the motor is disconnected. I have tried:

    sd->setReg(DRV8434SRegAddr::CTRL4,0x38);  // Enable the Open Load (OL) Fault bit
   uint8_t fault_status_byte = sd->readFault();  // fetch the fault register
    Serial.print ("     FAULT Status byte "); Serial.println(fault_status_byte,HEX);

The byte printed is always zero.
Driving the motor 20 steps (no microstepping) does not help.
Suggestions?

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