Inspection Procedure

WARNING: This page is about a different car, the 2006 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

CHECK BRAKE BOOSTER PRESSURE SWITCH (PL) RESISTANCE
1. Disconnect the A38 actuator connector.
2. With the ignition switch OFF, depress the brake pedal more than 40 times to decrease the accumulator pressure.
  HINT:
  
  When pressure in power supply system is released, reaction force becomes light.
3. Measure the resistance between terminals PL and PLG of the brake actuator.
  Standard resistance: 5.1 to 6.3 kΩ
  
  HINT:
  
  After inspection, connect the connector and clear the DTC.
NG: REPLACE BRAKE ACTUATOR

Fig 1: Identifying A38 Actuator Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: GO TO NEXT STEP
CHECK BRAKE BOOSTER PRESSURE SWITCH (RH) RESISTANCE
1. Disconnect the A37 actuator connector.
2. With the ignition switch OFF, depress the brake pedal more than 40 times to decrease the accumulator pressure.
  HINT:
  
  When pressure in power supply system is released, reaction force becomes light.
3. Measure the resistance between terminals PH and PHG of the brake actuator.
  Standard resistance: 0.9 to 1.1 kΩ
  
  HINT:
  
  After inspection, connect the connector and clear the DTC.
NG: REPLACE BRAKE ACTUATOR

Fig 2: Identifying A37 Actuator Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: GO TO NEXT STEP
CHECK WIRE HARNESS (SKID CONTROL ECU ASSEMBLY - BRAKE ACTUATOR)
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: REPLACE SKID CONTROL ECU ASSEMBLY