Inspection Procedure

HINT:

When C1251/51, C1253/53, or C1254/54 is output together with C1256/56, inspect and repair the trouble area indicated by C1251/51, C1253/53, or C1254/54 first.

1. RECONFIRM DTC 
   1. Clear the DTC (See DTC CHECK/CLEAR  ).
   2. Turn the ignition switch off.
   3. Depress the brake pedal more than 20 times.
   4. Turn the ignition switch to the ON position.
   5. Wait for 99 seconds.
   6. Check if the same DTC is detected (See DTC CHECK/CLEAR  ).

   Result 

   RESULT TABLE
   
   

   Condition	Proceed to
   DTC is output	A
   DTC is not output	B

   HINT:

   Excessive brake pedal operation results in abnormal accumulator pressure consumption. This is normal.

   B: END 

   A: Go to Next Step 

2. CHECK HYDRAULIC CIRCUIT 
   1. Check the hydraulic circuit (See ON-VEHICLE INSPECTION ).

      OK: Hydraulic circuit is normal (No leakage). 

   NG: REPAIR HYDRAULIC CIRCUIT 

   OK: Go to Next Step 

3. READ VALUE OF INTELLIGENT TESTER (ACCUMULATOR PRESSURE SENSOR) 
   1. Connect the intelligent tester to the DLC3.
   2. Turn the ignition switch to the ON position and push the intelligent tester main switch ON.
   3. Select "DATA LIST" mode on the intelligent tester.
      DATA LIST
      
      

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      ACC PRESS SENS	Accumulator pressure sensor reading / min.: 0 V, max.: 5 V	3.58 to 5 V	If the value is constant regardless of pump operation, accumulator pressure sensor malfunction is suspected.

   4. Check that the accumulator's output value is normal.

      OK: Accumulator pressure sensor value is normal. 

   NG: REPLACE MASTER CYLINDER SOLENOID 

   OK: Go to Next Step 

4. RECONFIRM DTC 
   1. Clear the DTC (See DTC CHECK/CLEAR  ).
   2. Check if the same DTC is detected (See DTC CHECK/CLEAR  ).

   Result 

   RESULT TABLE
   
   

   Condition	Proceed to
   DTC is output	A
   DTC is not output	B

   B: END 

   A: REPLACE MASTER CYLINDER SOLENOID