C1378

BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C1378/44: Capacitor Communication Malfunction

DTC C1378/44 - Capacitor Communication Malfunction

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE
NOTE: When replacing the skid control ECU, perform initialization of linear solenoid valve and calibration Programming and Relearning.

PROCEDURE

1. INSPECT BRAKE CONTROL POWER SUPPLY

(a) Disconnect the U27 power supply connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 OR GND CIRCUIT)
OK -- Continue to next step.
2. CHECK WIRE HARNESS (SKID CONTROL ECU - BRAKE CONTROL POWER SUPPLY)

(a) Disconnect the A13 ECU connector.
(b) Disconnect the U27 power supply connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. RECONFIRM DTC
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Turn the power switch ON (IG).
(c) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
HINT: Reinstall the sensor, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

Result

B -- CHECK FREEZE FRAME DATA
A -- END
4. CHECK FREEZE FRAME DATA
(a) Check the information code from the Freeze Frame Data memorized when the DTC (C1378/44) is stored Freeze Frame Data.

Result

B -- REPLACE BRAKE CONTROL POWER SUPPLY
A -- REPLACE SKID CONTROL ECU