Inspection Procedure

HINT:

Remove the hydraulic brake booster assembly before the inspection (See REMOVAL ).

1. CHECK CONNECTION OF PUMP MOTOR WIRE HARNESS 
   1. Using a screwdriver, remove the 2 plugs from the hydraulic brake booster assembly (See DISASSEMBLY ).
   2. Check the tightening torque of the 2 screws which tighten the wire harness connecting the hydraulic brake booster assembly and brake booster pump (See REASSEMBLY ).

      OK: The harness is tightened to the specific torque. 

      Torque: 2.9 N*m (30 kgf*cm, 26 in.*lbf) 

   NG: RETIGHTEN SCREWS 

   OK: Go to Next Step 

2. CHECK RESISTANCE OF PUMP MOTOR WIRE HARNESS 
   1. Using a screwdriver, remove the 2 screws and pull the wire harness from the hydraulic brake booster assembly.
   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION
      
      

      Tester Connection	Condition	Specified Condition
      Red wire terminal - Black wire terminal	Always	2 Ω

   NG: REPLACE BRAKE BOOSTER PUMP ASSEMBLY  (See DISASSEMBLY )

   Fig 1: Identifying Pump Motor Red And Black Wire

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to Next Step 

3. RECONFIRM DTC 
   1. Reassemble the hydraulic brake booster assembly (See REASSEMBLY ).
   2. Install the hydraulic brake booster assembly (See INSTALLATION ).
   3. Clear the DTC (See DTC CHECK/CLEAR  ).
   4. Check if the same DTC is output (See DTC CHECK/CLEAR  ).

      Result 

      RESULT REFERENCE
      
      

      Result	Proceed to
      DTC is output	A
      DTC is not output	B

   B: USE SIMULATION METHOD TO CHECK  (See HOW TO PROCEED WITH TROUBLESHOOTING )

   A: REPLACE MASTER CYLINDER SOLENOID  (See DISASSEMBLY )