Normal Operation

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

The voltage required for correct ABS operation is 10-18 volts. Fused battery voltage is supplied to the ABS module from battery junction box (BJB) fuse 6 (5A) along circuit SBB06 (BN/RD), BJB fuse 9 (50A) along circuit SBB09 (RD) and BJB fuse 18 (50A) along circuit SBB18 (YE/RD). Fused ignition voltage is supplied to the ABS module from smart junction box (SJB) fuse 34 (5A) along circuit CBP34 (VT/BN). Ground is provided along circuit GD113 (BK/YE) and circuit GD179 (BK/VT).

The ABS module has 4 circuits for voltage supply. One is for the pump motor, one is for the hydraulic control unit (HCU) valves and the last 2 are for the ABS module itself. If the ABS module voltage circuit is faulted (open, shorted, etc.), then the ABS module will use the HCU valve voltage input as a backup voltage supply. However, the valve circuit is not as clean as the ignition circuit and this causes interference in the ABS module and may result in incorrect ABS operation.

The ABS module has 2 separate grounds, one for the pump motor and one for the HCU valves. If one of the grounds is faulted (open, shorted, etc.) then the ABS module uses one ground for both items. However, using one ground circuit for both items causes interference in the system and may result in incorrect ABS operation.

DTC U2060 ECU Redundant Power Circuit Open - Anytime the ignition key is in the RUN position, if the ABS module detects an open or a short to ground on one of the voltage supply circuits, DTC U2060 will be set.
DTC U2062 ECU Redundant Ground Circuit Open - Anytime the ignition key is in the RUN position, if the ABS module detects an open on one of the ground circuits, DTC U2062 will be set.

This pinpoint test is intended to diagnose the following:

Fuse(s)
Wiring, terminals or connectors
ABS module