Inspection Procedure

HINT:

• Check the condition of each related circuit connector before troubleshooting (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
• When C1774 is output, inspect and repair the trouble areas indicated by C1774 first (See DTC C1774 LOW BATTERY POSITIVE VOLTAGE  ).

1. CHECK DTC 
   1. Check if any speed sensor DTCs (Brake control system trouble code: C0200/31, C0205/32, C0210/33, C0215/34, C1235/35, C1236/36, C1238/38, C1239/39) or a CAN communication DTC (U0122/67) is output together with DTC C1776 (See DTC CHECK/CLEAR  , BC-54 (2GR-FSE) and BC-296 (1UR-FSE)).

      Result 

      DTC RESULT REFERENCE
      
      

      Result	Proceed to
      Only DTC C1776 is output	A
      Speed sensor DTC is output (Brake control system trouble code)	B
      CAN communication DTC is output	C

   B : REPAIR CIRCUIT INDICATED BY OUTPUT CODE 

   C : REPAIR CIRCUIT INDICATED BY OUTPUT CODE 

   A : Go to Next Step 

2. READ VALUE OF TECHSTREAM 
   1. Connect Techstream to DLC3.
   2. Start the engine and turn the Techstream main switch on.
   3. Select "DATA LIST" mode on Techstream (See DATA LIST/ACTIVE TEST  ).

      DATA LIST (EMS): 

      DATA LIST REFERENCE
      
      

      Item	Measurement Item/Range (Display)	Normal Condition	Diagnostic Note
      VEHICLE SPD	Vehicle speed reading/min.: 0 km/h (0 mph), max: 255 km/h (158 mph)	Actual wheel speed	Speed indicated on speedometer

   4. Check that there is no difference between the speed value output from the skid control ECU displayed on Techstream and the speed value displayed on the speedometer when driving the vehicle.

      OK: The speed value output from the skid control ECU displayed on Techstream is the same as the actual vehicle speed. 

   NG : CHECK BRAKE CONTROL SYSTEM (SPEED SENSOR SIGNAL) 

   OK : Go to Next Step 

3. RECONFIRM DTC 
   1. Clear the DTC (See FAIL-SAFE CHART  ).
   2. Perform a road test.
   3. Check if the same DTC is recorded (See FAIL-SAFE CHART  ).

      Result 

      DTC RESULT REFERENCE
      
      

      Result	Proceed to
      DTC is output	A
      DTC is not output (When troubleshooting accordance with the PROBLEM SYMPTOMS TABLE)	B
      DTC is not output	C

   B : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

   C : END 

   A : REPLACE ABSORBER CONTROL ECU