Inspection Procedure

WARNING: This page is about a different car, the 2005 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

Check operation of hydraulic brake booster pump motor.
PREPARATION:

Disconnect the 2 connectors from the hydraulic brake booster.

CHECK:

Connect the battery positive (c) lead to terminal BM1 or BM2 and the battery negative (c) lead to terminal EM1 or EM2 of the hydraulic brake booster (pump motor) connector.

OK:

The operation sound of the pump motor should be heard.

Fig 1: Checking Operation Of Hydraulic Brake Booster Pump Motor
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Go to step 4 .
2. OK: Go to next step.
Check hydraulic brake booster resistance.
PREPARATION:

Disconnect the 2 connectors from the hydraulic brake booster.

CHECK:

Check resistance between terminals MT+ and MT-, BM1 and MT, BM2 and MT, EM1 and MT+, EM2 and MT+ of the hydraulic brake booster connector.

OK:

30 to 36 Ω

Fig 2: Checking Resistance Between Terminals Of Hydraulic Brake Booster Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Replace the hydraulic brake booster assembly.
2. OK: Go to next step.
Check for open circuit in harness and connector between hydraulic brake booster (MT+, MT-) and skid control ECU (See HOW TO USE THE DIAGNOSTIC TABLE AND INSPECTION ).
1. NG: Repair or replace harness or connector.
2. OK: Check and replace skid control ECU.
Check for open or short circuit in harness and connector between hydraulic brake booster and skid control ECU (See HOW TO USE THE DIAGNOSTIC TABLE AND INSPECTION ).
1. NG: Replace wire harness.
2. OK: Go to next step.
Check hydraulic brake booster pump motor (See INSPECTION ).
1. NG: Replace hydraulic brake booster pump motor.
2. OK: Replace hydraulic brake booster.