Inspection Procedure

1. Disconnect the skid control ECU connector.
2. Turn the ignition switch to ON.
3. Ground terminal HDCW of the skid control ECU.
4. Check the A-TRAC indicator light.

   OK 

   A-TRAC INDICATOR LIGHT OPERATION REFERENCE
   
   

   HDCW - GND Condition	Illumination Condition
   Connecting	ON
   Disconnecting	OFF

   Fig 1: Identifying Skid Control ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step 2 

OK: REPLACE MASTER CYLINDER SOLENOID  (See DISASSEMBLY )

1. Disconnect the skid control ECU connector.
Fig 2: Identifying Skid Control ECU Connector And Combination Meter Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the combination meter connector.
3. Measure the resistance.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   A4-33 (HDCW) - E14-9 (ATRA)	Below 1 Ω
   A4-33 (HDCW) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Check the combination meter system (See TERMINALS OF ECU ).

   OK: 

   Combination meter is normal. 

NG: REPLACE COMBINATION METER ASSEMBLY  (See REMOVAL )

OK: CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT PROBLEMS  )