DTC C1391/69: Accumulator Leak Malfunction [08/2013 - ]: Procedure

1. Check that there are no fluid leaks in the brake lines between the brake actuator (brake booster with master cylinder assembly) and the wheel cylinders.
2. Check that the brakes are not dragging.

   OK

   There are no fluid leaks or dragging.

NG → REPAIR OR REPLACE APPLICABLE PART 

OK: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2013 - ] .
2. Turn the power switch on (READY).
3. Check if the same DTC is output. Refer to DTC CHECK / CLEAR [08/2013 - ] .

   Result

   Result	Proceed to
   DTC C1391/69 is output.	A
   DTC C1391/69 is not output.	B

B → See step   6 

A: Go to next step 

1. Turn the power switch off.
2. Connect the Techstream to the DLC3.
3. Turn the power switch on (IG).
4. Select the Active Test on the Techstream. Refer to DATA LIST / ACTIVE TEST [08/2013 - ] .

   HINT: 

   The Active Test can be performed when the following conditions are met.

   • ABS main relay is on.
   • Shift lever is in P.
   • Parking brake is applied.
   • Vehicle speed is 0 km/h (0 mph).
   ABS/VSC/TRAC
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   ECB* Solenoid (SMC/SRC/SCC)	Switching solenoid valve (SMC/SRC/SCC)	Solenoid ON/OFF	Operation sound of solenoid (clicking sound) can be heard

   *: Electronically Controlled Brake System

5. Perform the Active Test of the solenoid using the Techstream.
6. Select the Data List on the Techstream. Refer to DATA LIST / ACTIVE TEST [08/2013 - ] .
   ABS/VSC/TRAC
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Wheel Cylinder Pressure Sensor	Wheel cylinder pressure sensor / Min.: 0.00 V, Max.: 5.00 V	When brake pedal released: 0.10 to 0.90 V	Reading increases when brake pedal is depressed

7. Check that the output value of the wheel cylinder pressure sensor does not increase.

   OK

   The output value of the wheel cylinder pressure sensor does not increase.

   HINT: 

   If the output value increases, there may be brake fluid leaks in the brake actuator (brake booster with master cylinder assembly).

   Result

   Result	Proceed to
   The output value of the wheel cylinder pressure sensor increases.	A
   The output values of the wheel cylinder pressure sensor does not increase.	B

B → See step   5 

A: Go to next step 

1. Replace the brake actuator (brake booster with master cylinder assembly). Refer to REMOVAL [08/2013 - ] .

NEXT → See step   5