Rear Reset Switch Closed

NAME OF CODE:
Rear Reset Switch Closed

SET CONDITION:
The following criteria be met for this code to be detected.
1. CAB not in the antilock pressure control mode.
2. Reset switch voltage low.
3. Criteria 1 and 2 satisfied for over 200 consecutive controller checks spaced 6 ms apart (1.0 second totals.

THEORY OPERATION:
The reset switch is designed to shuttle for either of two hydraulic trouble conditions.
1. Hydraulic pressure difference between the inlet and outlet of each conventional braking circuit through the hydraulic system (caused by an unacceptable restriction).
2. Hydraulic pressure built up in a low pressure accumulator by enough fluid leaking into it to push the accumulator piston full stroke to a hard stop and causing accumulator pressure to exceed 200 psi.

POSSIBLE CAUSES:
- Anything that keeps the reset switch voltage low when not in the antilock mode
- Isolation orifice blocked during conventional braking
- Dump seat leaking during conventional braking
- A solenoid valve energized when not in the antilock mode may indicate a defective CAB output
- Stuck reset switch
- Reset switch feedback circuit shorted to ground
- Reset switch feedback circuit open