Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - ECM)
1. Disconnect the skid control ECU connector S1 and the ECM connector E6.
  
  Fig 1: Disconnecting Skid Control ECU Connector & ECM Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in Fig 2 .
  Standard
  
  Fig 2: Measuring Resistance Of NEO Specifications Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in Fig 3 .
  Standard
  
  Fig 3: Measuring Resistance Between NEO & Body Ground Specifications Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step.
INSPECT ECM TERMINAL VOLTAGE (NEO TERMINAL)
1. Reconnect the ECM connector E6 and the skid control ECU connector S1.
  
  Fig 4: Reconnecting ECM Connector & Skid Control ECU Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the signal waveform between terminal NEO (E6-17) of the ECM and body ground for the engine conditions below in Fig 5.
Standard:
1. Waveform similar to Fig 6 is output.
Fig 5: Checking Terminals Between NEO & Body Ground Specifications Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 6: Checking Signal Waveform Between Terminals NEO & Body Ground
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE ECM

OK: Go to next step.
RECONFIRM DTC
1. Clear the DTCs. (see PRE-CHECK )
2. Turn the ignition switch to the ON position.
3. Are the same DTCs recorded? (see PRE-CHECK )
NO: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (SEE PROBLEM SYMPTOMS TABLE )

YES: REPLACE BRAKE ACTUATOR ASSY (SEE REPLACEMENT )

NOTE: When replacing the Brake Actuator assy, perform zero point calibration (see PRE-CHECK ).