Inspection Procedure

NOTE: When replacing the master cylinder solenoid, perform zero point calibration (See CALIBRATION ).

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.

RECONFIRM DTC

Clear the DTC (See DTC CHECK/CLEAR ).
Turn the engine switch off.
Depress the brake pedal more than 20 times.
Turn the engine switch on (IG).
Wait for 99 seconds.
Check if the same DTC is output (See DTC CHECK/CLEAR ).

Result

RESULT REFERENCE

Result	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: USE SIMULATION METHOD TO CHECK (See HOW TO PROCEED WITH TROUBLESHOOTING )

A: Go to next step

CHECK HYDRAULIC CIRCUIT
1. Check the hydraulic circuit (See SYSTEM DIAGRAM ).
OK: Hydraulic circuit is normal (No leakage).

NG: REPAIR HYDRAULIC CIRCUIT (See SYSTEM DIAGRAM )

OK: Go to next step

READ VALUE USING TECHSTREAM (ACCUMULATOR SENSOR)

Connect the Techstream to the DLC3.
Turn the engine switch on (IG) and turn the Techstream on.

Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.

ABS/VSC/TRAC

DATA LIST

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

Check that the accumulator output value is normal.
OK: Accumulator pressure sensor value is normal.

NG: REPLACE MASTER CYLINDER SOLENOID (See DISASSEMBLY )

OK: Go to next step

RECONFIRM DTC

Clear the DTC (See DTC CHECK/CLEAR ).
Check if the same DTC is output (See DTC CHECK/CLEAR ).

Result

RESULT REFERENCE

Result	Proceed to
DTC is output.	A
DTC is not output.	B

B: USE SIMULATION METHOD TO CHECK (See HOW TO PROCEED WITH TROUBLESHOOTING )

A: REPLACE MASTER CYLINDER SOLENOID (See DISASSEMBLY )