ABS with Ebd System: Other Scion tC I

PRECAUTION

Note. When disconnecting the battery terminal, initialize the following system after the terminal is reconnecting.

ABS WITH EBD SYSTEM REFERENCE

1. When there is a malfunction in the contact point of the terminals or installation problems with parts, removing and installing of the suspected problem parts may return the system to the normal condition either completely or temporarily.
2. In order to determine the malfunctioning area, be sure to check the conditions at the time the malfunction occurred, such as by DTC output and the freeze frame data output, and record it before disconnecting each connector or removing and installing parts.
3. Since the ABS with EBD system may be influenced by a malfunction in the other systems, be sure to check for DTCs in the other systems.
4. Be sure to remove and install the brake actuator and each sensor with the ignition switch off unless specified in the inspection procedure.
5. When removing and installing the brake actuator and each sensor, be sure to check that the normal display is output in the test mode inspection and the DTC output inspection after installing all the parts.

Scheme 90

Scheme 91

FREEZE FRAME DATA OF ABS

1. FREEZE FRAME DATA HINT: Whenever a DTC is detected or the ABS operates, the skid control ECU stores the current vehicle (sensor) state as freeze frame data. The skid control ECU stores the number of times (maximum: 31) the ignition switch has been turned from off to the ON position since the last time the ABS was activated. However, if the vehicle was stopped or at a low speed (4.3 mph (7 km/h) or less), or if a DTC is detected, the skid control ECU will not count the number since then. Freeze frame data at the time the ABS operates: The skid control ECU stores and updates data whenever the ABS system operates. When the ECU stores data at the time a DTC is detected, the data stored when the ABS operated is erased. Freeze frame data at the time a DTC is detected: When the skid control ECU stores data at the time a DTC is detected, no updates will be performed until the data is cleared (SEE «DTC CHECK/CLEAR»(ref-224755-S01853767152006031100000) ). Connect the hand-held tester to the DLC3. Turn the ignition switch to the ON position. From the display on the tester, select the "FREEZE FRAME DATA". FREEZE FRAME DATA Hand-held tester display Measurement Item Reference Value* VEHICLE SPD Vehicle speed min.: 0, max.: 326.4 km/h STOP LIGHT SW Stop light switch signal Stop light switch ON: ON, OFF: OFF # IG ON Numbers of operations of ignition switch ON after memorizing freeze frame data 0 to 31 SYSTEM System status ABS activated: ABS, NO SYS, FAIL SAFE TROUBLE CODE Freeze DTC min.: 0, max.: 255 SPD GRADE Vehicle speed grade min.: -1.869, max.: 1.869 # CODES Number of trouble code min.: 0, max.: 255

FAIL-SAFE CHART

1. FAIL SAFE OPERATION If there is a problem with sensor signals or actuator systems, the skid control ECU prohibits power supply to the brake actuator and prohibits ABS control. The ABS control will be prohibited, but EBD control continues as much as possible. If EBD control is impossible, the brake warning light comes on to warn the driver. ABS AND EBD SYSTEM SYMPTOM Malfunction Symptom ABS system ABS control prohibited EBD system ABS & EBD control prohibited HINT: If the ABS system encounters a malfunction, the brake system will operate normally without ABS control.

ABS WARNING LIGHT CIRCUIT (REMAINS ON)

When reading DTCs by SST (CHECK WIRE), if the ABS warning light remains on, troubleshoot by following the inspection flow.