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 (+) lead to terminal BM1 or BM2 and the battery negative (-) 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 9 .
2. OK: Go to next step.
Check for short circuit (to B+) in harness and connector between BM1 or BM2 of hydraulic brake booster and ABS motor 1 relay or ABS motor 2 relay (See HOW TO USE THE DIAGNOSTIC TABLE AND INSPECTION ).
1. NG: Repair or replace harness or connector.
2. OK: Go to next step.
Check for short circuit (to B+) in harness and connector between MT of hydraulic brake booster and skid control ECU (See HOW TO USE THE DIAGNOSTIC TABLE AND INSPECTION ).
1. NG: Repair or replace harness or connector.
2. OK: Go to next step.
Check pressure switch (PH).
In case of using the hand-held tester:

PREPARATION:
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON and push the hand-held tester main switch ON.
3. Select the DATA LIST mode on the hand-held tester.
CHECK:

Depress the brake pedal more than 40 times with the ignition switch OFF, then turn the ignition switch ON and check the pressure switch (PH) condition.

HINT:

When pressure in the power supply system is released, reaction force becomes light and stroke becomes longer.

OK:

"OFF" turns to "ON".

HINT:

OFF: Low pressure

ON: High pressure

In case of not using the hand-held tester:

PREPARATION:
1. Disconnect the connector (5P) from the hydraulic brake booster.
2. With the ignition switch OFF, depress the brake pedal more than 40 times to decrease the accumulator pressure.
HINT:

When pressure in the power supply system is released, reaction force becomes light and stroke becomes longer.

CHECK:

Measure resistance between terminals PH and PHG of the hydraulic brake booster connector.

OK:

Resistance: 1.0 kΩ

PREPARATION:
1. Connect the connector (5P) to the hydraulic brake booster.
2. Disconnect the connector (5P) after the ignition switch is turned ON and the pump motor is stopped.
  CHECK:
  
  Measure resistance between terminals PH and PHG of the hydraulic brake booster connector.
  
  OK:
  
  Resistance: 0 Ω
  
  HINT:
  
  After inspection, connect the connector and clear the DTC (See PRE-CHECK ).
  
  Fig 2: Measuring Resistance Between Terminals PH & PHG Of Hydraulic Brake Booster Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Replace hydraulic brake booster assembly.
2. OK: Go to next step.
Check pressure switch (PL).
In case of using hand-held tester:

PREPARATION:
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON and push the hand-held tester main switch ON.
3. Select the DATA LIST mode on the hand-held tester.
CHECK:

Depress the brake pedal more than 40 times with the ignition switch OFF, then turn the ignition switch ON and check the pressure switch (PH) condition.

HINT:

When pressure in the power supply system is released, reaction force becomes light and stroke becomes longer.

OK:

"OFF" turns to "ON".

HINT:

OFF: Low pressure

ON: High pressure

In case of not using the hand-held tester:

PREPARATION:
1. Disconnect the connector (8P) from the hydraulic brake booster.
2. With the ignition switch OFF, depress the brake pedal more than 40 times to decrease the accumulator pressure.
HINT:

When pressure in the power supply system is released, reaction force becomes light and stroke becomes longer.

CHECK:

Measure resistance between terminals PL and PLG of the hydraulic brake booster connector.

OK:

Resistance: 5.7 kΩ

PREPARATION:
1. Connect the connector (8P) to the hydraulic brake booster.
2. Disconnect the connector (8P) after the ignition switch is turned ON and the pump motor is stopped.
  CHECK:
  
  Measure resistance between terminals PL and PLG of the hydraulic brake booster connector.
  
  OK:
  
  Resistance: 1.0 kΩ
  
  Fig 3: Measuring Resistance Between Terminals PL & PLG Of Hydraulic Brake Booster Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT:
  
  After inspection, connect the connector and clear the DTC (See PRE-CHECK ).
1. NG: Replace hydraulic brake booster assembly.
2. OK: Go to next step.
Check for short circuit (to B+) in harness and connector between pressure switch and skid control ECU (See HOW TO USE THE DIAGNOSTIC TABLE AND INSPECTION ).
1. NG: Repair or replace harness or connector.
2. OK: Go to next step.

Check ABS motor 1 relay and ABS motor 2 relay.

PREPARATION:

Remove the ABS motor 1 relay and ABS motor 2 relay from the engine room J/B.

CHECK:

Check continuity between the motor relay terminals listed in TERMINALS NO AND CONTINUITY .

OK:

TERMINALS NO AND CONTINUITY

Terminals 3 and 4

Continuity (Reference value ⁽¹⁾)

Terminals 1 and 2

Open

⁽¹⁾	ABS motor 1 relay: 54 Ω: ABS motor 2 relay: 62 Ω

*1: ABS motor 1 relay: 54 Ω

ABS motor 2 relay: 62 Ω

Fig 4: Checking Continuity Between Motor Relay Terminals

CHECK:

Apply battery positive voltage between terminals 3 and 4.
Check continuity between terminals.
OK:
TERMINALS NO AND CONTINUITY

Terminals 1 and 2 Continuity

NG: Replace ABS motor 1 relay or ABS motor 2 relay.
OK: Go to next step.

Check for short circuit in harness and connector between ABS motor 1 relay or ABS motor 2 relay 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.