Inspection Procedure
NOTE:
When replacing the skid control ECU or brake actuator assembly, perform initialization of linear solenoid valve and calibration (See
INITIALIZATION ).
HINT:
- When C1241/41, C1252/52 or C1253/53 is output together with C1256/57, inspect and repair the trouble areas indicated by C1241/41, C1252/52 or C1253/53 first.
- DTCs may be output if the accumulator pressure drops due to frequent braking (this is not a malfunction).
- PROBLEM CHECK
- Ask the customer if frequent braking is performed when the brake control warning light comes on.
OK
RESULT CHARTCondition Proceed To Frequent braking is performed A Frequent braking is not performed B HINT:
This DTC is output even if the accumulator pressure drops only temporarily due to frequent braking.
B: END
A: Go to next step
- INSPECT BRAKE ACTUATOR ASSEMBLY
- Disconnect the brake actuator assembly connector.
- Measure the resistance according to the value(s) in the table below.
Resistance
TESTER CONNECTION SPECIFIED CONDITION CHARTTester Connection Specified Condition 32 (BM2) - 1 (GND1) Below 10 Ω 31 (BM1) - 1 (GND1) Below 10 Ω 32 (BM2) - 31 (BM1) Below 1 Ω 1 (GND1) - 2 (GND2) Below 1 Ω 32 (BM2) - 3 (MTT) About 10 Ω 31 (BM1) - 3 (MTT) About 10 Ω Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE BRAKE ACTUATOR ASSEMBLY
OK: Go to next step
- READ VALUE OF INTELLIGENT TESTER (ACCUMULATOR PRESSURE SENSOR)
- Connect the intelligent tester to the DLC3.
- Turn the ignition switch on.
- Select the DATA LIST mode on the intelligent tester.
ABS/VSC/TRAC:
MEASUREMENT ITEM NORMAL CONDITION CHARTItem Measurement Item / Range (Display) Normal condition ACC PRESS SENS Accumulator pressure sensor / min.: 0 V, max.: 5 V Specified value: 3.2 to 4.0 V - Depress the brake pedal 4 or 5 times to operate the pump motor, and check the output value on the intelligent tester with the motor stopped (not braking).
OK: ACC pressure sensor's output voltage does not drop.
NG: REPLACE BRAKE ACTUATOR ASSEMBLY
OK: REPLACE SKID CONTROL ECU