U4 Verify Ignition Power to Antilock Brake Control Module

- Set up Rotunda 88 Digital Multimeter 105-00053 or equivalent to measure voltage between Pins 1 and 17.

- Key On.

- Is voltage measured greater than 9V?

YES -- Sufficient power to antilock brake control module is available. Go to U5.

NO -- Find and service cause of no or low voltage. Repeat PC4.