Normal Operation and Fault Conditions

WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.

The ABS module uses an internal solid state switch to operate the hydraulic pump motor. The ABS module tests the hydraulic pump motor by activating it for 30 milliseconds. The ABS module monitors the voltage drop across the hydraulic pump motor while the pump motor is being activated. After 30 milliseconds have passed, the ABS module stops applying voltage to the pump motor and monitors the voltage the spinning hydraulic pump motor is generating and the voltage drop across the hydraulic pump motor solid state switch. If the monitored voltages are not within the specifications, the ABS module sets one or more DTCs.

PPT H ABS MODULE DTC FAULT TRIGGER CONDITIONS

DTC	Description	Fault Trigger Conditions
C0020:16	ABS Pump Motor Control: Circuit Voltage Below Threshold	Sets when the ABS module detects an under voltage condition at the pump motor voltage input.
C0020:17	ABS Pump Motor Control: Circuit Voltage Above Threshold	Sets when the ABS module detects more than 0.93 volt for longer than 3 seconds from the pump motor once the pump motor has been deactivated.
C0020:49	ABS Pump Motor Control: Internal Electronic Failure	Sets if the hydraulic pump motor actual state does not match the commanded state for 30 seconds; pump is running, pump is not running or pump motor relay shorted.