Solenoid Circuit Open

NAME OF CODE:
LF Solenoid Circuit Open
RF Solenoid Circuit Open
LR Solenoid Circuit Open
RR Solenoid Circuit Open

WHEN MONITORED:
Anytime the system relay is energized, system relay output voltage must be above 9 volts and below 20 volts. The static solenoid test is conducted only when not in Anti-lock Brake System (ABS) cycling. It runs once each 630 ms. The dynamic solenoid test is run every minute when not in ABS cycling, and every 620 ms when in cycling. Each solenoid is tested separately at 5 ms intervals, with a complete test taking 20 ms to complete.

SET CONDITION:
The modulator is a group of four solenoid valves controlled by the Controller, Anti-lock Brake (CAB) to modulate brake pressure during ABS control. One solenoid valve controls each wheel. Solenoid power is supplied through the CAB's internal solenoid drivers. The CAB receives power for the solenoids from the system relay located in the relay box. The CAB monitors each driver circuit when it is off and will store a trouble code if the solenoid voltage is above 2 volts during a static test or above a calculated threshold referenced to the system relay output voltage during a dynamic test.

POSSIBLE CAUSES:
- Open decay solenoid control circuit
- Open decay solenoid coil
- Failed solenoid driver
- Loose or corroded connector terminals
- Decay solenoid control circuit shorted to B(+)
- High resistance in the decay solenoid circuit