HBB CHECK



CONTINUITY AND RESISTANCE TEST OF PUMP MOTOR


1.Disconnect the HBB connectors.

2.Measure the resistance between the terminals at the HBB.
Tester connection
Specified condition
Resistance value Ω (Reference value)
2 - 7
Continuity
10 or less
2 - 8
Continuity
Approx. 33
2 - 31
Continuity
Less than 2
4 - 6
Continuity
Approx. 33
4 - 32
Continuity
Approx. 33
6 - 7
Continuity
Less than 2
6 - 32
Continuity
Less than 2
7 - 32
Continuity
Less than 2
8 - 31
Continuity
Approx. 33
31 - 32
Continuity
10 or less

PRESSURE SWITCH (FOR PUMP CONTROL) CHECK


1.Depress the brake pedal repeatedly more than 40 times until the pedal depressing force feels heavy with the ignition switch at the "LOCK" (OFF) position to release the pressure of HBB power supply system.

2.Disconnect the HBB connector "A".
3.Measure the resistance between terminals No. 33 and No. 35 at the HBB connector "A".
Tester connection
Specified condition
Resistance value kΩ
33 - 35
Continuity
Approx. 1
4.If the resistance value exceeds the specified value, replace the HBB master cylinder and hydraulic unit assembly.
5.After connect the HBB connector "A", turn the ignition switch to the "ON" position to operate the pump motor. Then confirm that the pump motor is stopped.
6.After turn the ignition switch to the "LOCK" (OFF) position, disconnect the HBB connector "A". Then measure the resistance between terminals No. 33 and No. 35 at the HBB connector "A".
Tester connection
Specified condition
Resistance value Ω
33 - 35
Continuity
Less than 2
7.If the resistance value exceeds the specified value, replace the HBB master cylinder and hydraulic unit assembly.
8.Connect the HBB connector "A".
9.Erase HBB diagnosis codes (Refer to , ).

PRESSURE SWITCH (FOR LOW-PRESSURE WARNING) CHECK


1.Depress the brake pedal repeatedly more than 40 times until the pedal depressing force is felt heavy with the ignition switch at the "LOCK" (OFF) position to release the pressure of HBB power supply system.

2.Disconnect the HBB connector "B".
3.Measure the resistance between terminals No. 1 and No. 5 at the HBB connector "B".
Tester connection
Specified condition
Resistance value kΩ
1 - 5
Continuity
Approx. 5.7
4.If the resistance value exceeds the specified value, replace the HBB master cylinder and hydraulic unit assembly.
5.Next, turn the ignition switch to the "ON" position to operate the pump motor. Then confirm that the pump motor is stopped.
6.Measure the resistance between terminals No. 1 and No. 5 at the HBB connector "B".
Tester connection
Specified condition
Resistance value kΩ
1 - 5
Continuity
Approx. 1
7.If the resistance value exceeds the specified value, replace the HBB master cylinder and hydraulic unit assembly.
8.Connect the HBB connector "B".
9.Erase HBB diagnosis codes (Refer to , ).