DTC C1452 Accumulator Low Pressure

DESCRIPTION

DTC Code	DTC Detection Condition	Trouble Area
C1452	After braking, the fluid pressure inside the accumulator is less than the threshold within 3.2 seconds.	Hydraulic circuit Master cylinder solenoid (Accumulator pressure sensor)

After replacing the master cylinder solenoid, perform zero point calibration ().

1.CUSTOMER PROBLEM ANALYSIS

Check with the customer to determine if frequent braking has been performed.

NEXT

2.RECONFIRM DTC

Clear the DTC ().

Turn the ignition switch off.

Depress the brake pedal more than 40 times.

Turn the ignition switch to ON.

Wait for 99 seconds.

Check if the same DTC is output ().

Result
Result	Proceed to
DTC is output	A
Frequent braking was not performed and DTC is not output	B
Frequent braking was performed and DTC is not output	C

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

CHECK FOR INTERMITTENT PROBLEMS ()

END

A

3.CHECK HYDRAULIC CIRCUIT

Check the hydraulic circuit ().

REPAIR HYDRAULIC CIRCUIT

OK

4.READ VALUE USING GTS (ACCUMULATOR SENSOR)

Connect the GTS to the DLC3.

Turn the ignition switch to ON.

Turn the GTS on.

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

ABS/VSC/TRC
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Accumulator Sensor	Accumulator pressure sensor reading/ Min.: 0.00 V, Max.: 5.00 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.

REPLACE MASTER CYLINDER SOLENOID ()

A

5.RECONFIRM DTC

Clear the DTCs ().

Check if the same DTC is output ().

REPLACE MASTER CYLINDER SOLENOID ()

CHECK FOR INTERMITTENT PROBLEMS ()