DD28 DTC 64 Check Pump Motor Pressure Capability

- Turn ignition switch OFF.

Anti-Lock Control Module:

- Disconnect anti-lock brake wiring plug from anti-lock brake control module.

Breakout Box:

- Connect EEC-IV Breakout Box 014-00322 with Anti-Lock Test Adapter T90P-50-ALA or equivalent to the anti-lock brake wiring plug harness.

- Jumper pins 15, 34 and 60.

- Apply and hold brake pedal.

- Turn ignition switch to RUN.

- Does brake pedal rise?

YES -- Reverify DTC 64.

NO -- Replace pump motor.