Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLEXUS2006RX 400H AWD V6-3.3L (3MZ-FE) HYBRIDREPAIR AND DIAGNOSISBRAKES AND TRACTION CONTROLANTILOCK BRAKES / TRACTION CONTROL SYSTEMSELECTRONIC BRAKE CONTROL MODULETESTING AND INSPECTION
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) Hybrid
Electronic Brake Control Module: Testing and Inspection
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) HybridSECTION Testing and Inspection
TERMINALS OF ECU
1. CHECK BATTERY VOLTAGE
a. Measure the battery voltage.
Voltage: 10 to 14 V
2. SKID CONTROL ECU ASSEMBLY INSPECTION
a. Measure the voltage between each terminal or between each terminal and the body ground.
b. Connect the intelligent tester to the DCL3, and check the communication condition with the skid control ECU.
c. Using an oscilloscope, check that the pulse generates between each terminal or between each terminal and the body ground.
NOTICE:
^ Inspection should be performed from the back of the connector with the connector connected to the skid control ECU.
^ The voltage between the terminals of the brake actuator assembly may become 0 V due to the fail safe function when the ECB warning light comes on (malfunctioning).
HINT: Inspect the ECU from the wire harness side while the connector is connected.
d. Waveform 1
NOTICE: Normal waveform is output only when BS 1 and 2 voltages are normal (10 to 14 V).
HINT:
^ While driving at approximately 12 mph (20 km/h).
^ 5 V/DIV, 200 ms/DIV.
^ Brake pedal depressed.
e. Waveform 2
NOTICE: Normal waveform is output only when BS 1 and 2 voltages are normal (10 to 14 V).
HINT:
^ While driving at approximately 12 mph (20 km/h).
^ 5 V/DIV, 200 ms/DIV.
^ Brake pedal depressed -> released
f. Waveform 3
NOTICE: As the vehicle speed (tire rotating speed) becomes faster, the cycle becomes shorter and the output voltage larger.
HINT:
^ 1 V/DIV, 2 ms/DIV.
^ While driving at approximately 18 mph (30 km/h).
g. Waveform 4
NOTICE: As the vehicle speed (tire rotating speed) becomes faster, the cycle becomes shorter.
HINT:
^ 5 V/DIV, 50 ms/DIV.
^ While driving at approximately 12 mph (20 km/h).
h. Waveform 5
HINT:
^ 5 V/DIV, 200 ms/DIV.
^ IG switch ON
i. Waveform 6
HINT:
^ 5 V/DIV, 100ms/DIV.
^ IG switch ON
j. Waveform 7
NOTICE: As the vehicle speed (tire rotating speed) becomes faster, the cycle becomes shorter.
HINT:
^ 1 V/DIV, 2 ms/DIV.
^ While driving at approximately 12 mph (20 km/h).
1. CHECK BATTERY VOLTAGE
a. Measure the battery voltage.
Voltage: 10 to 14 V
2. SKID CONTROL ECU ASSEMBLY INSPECTION
a. Measure the voltage between each terminal or between each terminal and the body ground.
b. Connect the intelligent tester to the DCL3, and check the communication condition with the skid control ECU.
c. Using an oscilloscope, check that the pulse generates between each terminal or between each terminal and the body ground.
NOTICE:
^ Inspection should be performed from the back of the connector with the connector connected to the skid control ECU.
^ The voltage between the terminals of the brake actuator assembly may become 0 V due to the fail safe function when the ECB warning light comes on (malfunctioning).
HINT: Inspect the ECU from the wire harness side while the connector is connected.
SKID CONTROL ECU:
SKID CONTROL ECU:
SKID CONTROL ECU:
SKID CONTROL ECU:
SKID CONTROL ECU:
Waveform 1:
d. Waveform 1
NOTICE: Normal waveform is output only when BS 1 and 2 voltages are normal (10 to 14 V).
HINT:
^ While driving at approximately 12 mph (20 km/h).
^ 5 V/DIV, 200 ms/DIV.
^ Brake pedal depressed.
Waveform 2:
e. Waveform 2
NOTICE: Normal waveform is output only when BS 1 and 2 voltages are normal (10 to 14 V).
HINT:
^ While driving at approximately 12 mph (20 km/h).
^ 5 V/DIV, 200 ms/DIV.
^ Brake pedal depressed -> released
Waveform 3:
f. Waveform 3
NOTICE: As the vehicle speed (tire rotating speed) becomes faster, the cycle becomes shorter and the output voltage larger.
HINT:
^ 1 V/DIV, 2 ms/DIV.
^ While driving at approximately 18 mph (30 km/h).
Waveform 4:
g. Waveform 4
NOTICE: As the vehicle speed (tire rotating speed) becomes faster, the cycle becomes shorter.
HINT:
^ 5 V/DIV, 50 ms/DIV.
^ While driving at approximately 12 mph (20 km/h).
Waveform 5:
h. Waveform 5
HINT:
^ 5 V/DIV, 200 ms/DIV.
^ IG switch ON
Waveform 6:
i. Waveform 6
HINT:
^ 5 V/DIV, 100ms/DIV.
^ IG switch ON
Waveform 7:
j. Waveform 7
NOTICE: As the vehicle speed (tire rotating speed) becomes faster, the cycle becomes shorter.
HINT:
^ 1 V/DIV, 2 ms/DIV.
^ While driving at approximately 12 mph (20 km/h).
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.