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Home >> Lincoln >> 2018 >> MKZ Select, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1493 (Anti-Lock Brake System (Abs) And Stability Control (Except Electric)) >> Diagnosis And Testing >> Anti-Lock Brake System (ABS) and Stability Control >> Pinpoint Tests >> Pinpoint Test A : U3003:13, U3003:16, U300E:13 >> Notes

Pinpoint Test A : U3003:13, U3003:16, U300E:13: Notes

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Refer to Vehicle Dynamic Systems for schematic and connector information.

Normal Operation and Fault Conditions 

The ABS module, hydraulic pump and solenoid valves require an operating voltage that is between 10 and 17 volts. The ABS module receives this voltage from the BJB. The ABS module has a single ground circuit located in the engine compartment wiring harness. Excessive resistance or an open in one or more of these circuits, a discharged battery or a inoperative charging system results in the ABS module setting a DTC.

Internally to the ABS module, the ignition voltage supply circuit is used as a redundant back up for the battery voltage supply circuit in case the battery voltage supply circuit is interrupted. If the battery voltage supply circuit is interrupted, the ABS module immediately shuts off and does not enter the power latch mode. The module uses the power latch mode to write certain parameters (such as learned offsets numbers) to non-volatile memory. At the beginning of each ignition cycle, a counter value is increased by 1 after a specified vehicle speed has been reached and a specified time has elapsed. When the ABS module enters the power latch mode, this counter is reset to 0.

DTC Fault Trigger Conditions 

DTC Description Fault Trigger Conditions
U3003:16 Battery Voltage: Circuit Voltage Below Threshold This DTC sets in continuous memory and on-demand if the voltage supplied to the ABS module falls below 10 volts.
U3003:13 Battery Voltage: Circuit Open This DTC sets in continuous memory and on-demand if the power latch mode counter reaches a predetermined number.
U300E:13 Ignition Input On: Circuit Open This DTC sets in continuous memory if the power mode message from the BCM indicates the ignition is ON, but the ignition voltage supplied to the ABS module is missing.

Possible Causes 

Visual Inspection and Diagnostic Pre-checks 

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