1, 2 and 3 Digit Codes: 11

Fault Code 11 Diagnosis Chart:

Replenishing Valve Circuit:

VALVE OPERATION
The replenishing valve directs pressurized brake fluid from the booster servo (hydraulic) circuit to the master cylinder. This prevents excessive pedal travel when anti-lock mode is engaged and during hard braking without anti-lock control. The replenishing valve also prevents a low or soft pedal if air is present in the hydraulic system.

Attached to the replenishing valve is a feedback switch (Sw) which is closed to ground when the valve is not activated. The feedback switch opens when the replenishing valve is engaged.

CIRCUIT OPERATION
The replenishing valve circuit receives power through the valve relay. The valve relay, which is included as part of the sensor block assembly, is engaged at key-on and remains engaged throughout the ignition cycle. The replenishing valve line (at the Anti-lock Brake Control Module (ABM) should have battery voltage present at all times.

The replenishing valve feedback line is held at 5 volts by the ABCM. When the replenishing valve is not engaged, the feedback line is grounded by the feedback switch (Sw).

The replenishing valve is engaged under the following two conditions:
(1) When braking hard without anti-lock control. This causes the booster piston travel switch S2b to open during normal braking. See "Fault Codes 13, 14 & 15" for booster piston travel switches operation.
(2) Whenever anti-lock mode is entered.

The ABCM engages the replenishing valve by grounding pin 30 at the controller. When the replenishing valve is engaged, the feedback switch (Sw) opens and the feedback switch line voltage is raised to 5 volts.

FAILURE CONDITIONS
Fault Code 11 will set anytime that the commanded replenishing valve position and the valve position indicated by the feedback line do not agree. The feedback line (pin 33) should be at ground whenever the valve is not engaged. With the valve engaged, the feedback line should be at 5 volts.