Mechanics

HI,I HAVE A LX470.THE ABS LIGHT AND THE BRAKE WARNING LIGHT HAVE COME ON AND THERE IS A CONTINOUS BEEPING.DIAGNOSTIC CODE WAS C1256(ACCUMULATOR LOW PRESSURE SWITCH MALFUNCTION).THE BRAKE BOOSTER PUMP DOES NOT SEEM TO BE WORKING (NO SOUND WITH I

2002 Lexus LX 470 • 30,000 miles

The car had other problems before. Like the passenger side windshield area used to leak water on to the ecu and other relays and the car would start by itself.(Its a right hand drive vehicle). Now that has stopped.


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A.senna
March 15, 2012.



Have the computer scanned for code/s-start here


Rasmataz
Mar 15, 2012.
Code is c1256(accumulator low pressure malfunction)


Tiny
A.senna
Mar 16, 2012.
Did you recently had brake job? Your possibilities here could be the accumulator, ABS motor, or the pressure switch.


Rasmataz
Mar 16, 2012.
Yes I have changed the brake pads recently. Where is the accumulator located?


Tiny
A.senna
Mar 17, 2012.
The accumulator is within the hydraulic brake booster-

Did you bleed the brake if so its probably not done right also have you tried erasing the code with a scantool

BLEEDING BRAKE SYSTEM
CAUTION: Wash off brake fluid immediately if it comes into contact with a painted surface.

NOTE: If any work is done on brake system or if air in brake lines is suspected, bleed air from system. When bleeding, keep amount of fluid in reservoir between Min. And Max. Use only SAE J1703 or FMVSS No. 116 DOT 3 brake fluid.

NOTE: If hydraulic brake booster has been disassembled, or if reservoir becomes empty, bleed hydraulic brake booster. See HYDRAULIC BRAKE BOOSTER.

BRAKE LINE
Fill reservoir with brake fluid.
Connect a vinyl tube to bleeder screw on brake caliper and place other end in a clear jar.
Depress brake pedal several times, then loosen bleeder screw with pedal held down.
When fluid stops coming out, tighten the bleeder screw to specification. See TORQUE SPECIFICATIONS.
Release brake pedal. Repeat steps 3 and 4 until all air in fluid has been bled out.
Repeat procedure to bleed air out of brake line for each wheel.
HYDRAULIC BRAKE BOOSTER
With Hand-held Tester
Turn ignition switch off and depress brake pedal more than 40 times. When pressure in power supply system is released, reaction force becomes light and stroke becomes longer.
Turn ignition switch on and check that pump stops after 30-40 seconds. If pump does not stop, repeat 1.
With ignition switch on, bleed right and left front brake calipers and then right and left rear. See BRAKE LINE.
Turn ignition switch off. Connect LEXUS hand-held tester to (DLC3). See Fig. 2.
Turn ignition switch on and select "AIR BLEEDING" on hand-held tester.
Select "FR LINE", depress brake pedal and hold it to bleed right front brake caliper. Repeat until there are no more air bubbles in fluid.
Select "FL LINE", depress brake pedal and hold it to bleed left front brake caliper. Repeat until there are no more air bubbles in fluid.
Select "RR LINE" and repeat procedure for right rear brake caliper and "LR LINE" for left rear.
Clear DTC. See CLEARING CODES under SELF-DIAGNOSTIC SYSTEM.


Rasmataz
Mar 17, 2012.
Bled the brakes. Light has gone out. Thank you


Tiny
A.senna
Mar 17, 2012.
Your welcome


Rasmataz
Mar 17, 2012.