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 DTC

Fig 1: Identifying Normal System & Malfunction Code Specifications Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

B: REPAIR CIRCUIT INDICATED BY OUTPUT DTC

A: Go to next step.
CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED
NG: CONNECT CONNECTOR TO ECU

OK: Go to next step.
INSPECT SKID CONTROL ECU TERMINAL VOLTAGE (IG1 TERMINAL)
WHEN USING HAND-HELD TESTER:
1. Connect the hand-held tester to the DLC3.
2. Start the engine.
3. Select the DATA LIST mode on the hand-held tester.
  
  Fig 2: IG Voltage Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Check the voltage condition output from the ECU displayed on the hand-held tester.
Standard:
1. "Normal" is displayed.
WHEN NOT USING HAND-HELD TESTER:
1. Disconnect the skid control ECU connector.
  
  Fig 3: Disconnecting Skid Control ECU Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch to the ON position.
3. Measure the voltage according to the value(s) in Fig 4 .
  Standard
  
  Fig 4: Measuring Voltage Between IG1 & GND1 Specifications Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: Go to next step.
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BODY GROUND)
1. Disconnect the skid control ECU connector S1.
  
  Fig 5: Disconnecting Skid Control ECU (GND1)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in Fig 6 .
  Standard
  
  Fig 6: Measuring Resistance Between GND1 & Body Ground Specifications Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: CHECK AND REPAIR HARNESS AND CONNECTOR (GND CIRCUIT)

OK: CHECK AND REPAIR HARNESS AND CONNECTOR (IG CIRCUIT)
INSPECT HARNESS AND CONNECTOR (SKID CONTROL ECU - COMBINATION METER)
1. Disconnect the skid control ECU connector S1 and combination meter connector C8.
  
  Fig 7: Disconnecting Skid Control ECU & Combination Meter
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in Fig 8 .
  Standard
  
  Fig 8: Measuring Resistance VSCW & Combination Meter Specifications Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in Fig 9 .
  Standard
  
  Fig 9: Measuring Resistance Between VSCW & Body Ground Specifications Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  NG: CHECK AND REPAIR HARNESS AND CONNECTOR
  
  OK: REPLACE BRAKE ACTUATOR ASSY (SEE REPLACEMENT )
  
  NOTE: When replacing the Brake Actuator assy, perform zero point calibration (see PRE-CHECK ).