C1377

BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C1377/43: Capacitor Malfunction

DTC C1377/43 - Capacitor Malfunction

DESCRIPTION

The brake control power supply assembly (capacitor) provides auxiliary power for brake control when an auxiliary battery (12 V) voltage drops.

WIRING DIAGRAM

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

PROCEDURE

1. CHECK FREEZE FRAME DATA
(a) Check the INF code from the Freeze Frame Data memorized when the DTC (C1337/43) is stored Freeze Frame Data.
Result:

C -- INSPECT BATTERY
B -- REPLACE BRAKE CONTROL POWER SUPPLY
A -- Continue to next step.
2. INSPECT FUSE (ABS NO.3 FUSE)

(a) Remove the ABS No.3 fuse from R/B No.4.
(b) Check the ABS No.3 fuse.
Resistance:
Below 1 Ohms (Continuity)
NG -- REPLACE FUSE
OK -- Continue to next step.
3. INSPECT BRAKE CONTROL POWER SUPPLY (+BC TERMINAL)

(a) Measure the voltage according to the value(s) in the table below.
HINT: Measure the voltage from the back side of the connector with the connector connected.

Voltage:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. INSPECT SKID CONTROL ECU (+BI1, +BI2 TERMINAL)

(a) Measure the voltage according to the value(s) in the table below.
HINT: Measure the voltage from the back side of the connector with the connector connected to the skid control ECU.

Voltage:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. INSPECT SKID CONTROL ECU (+BO1, +BO2 TERMINAL)

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
6. INSPECT BRAKE CONTROL POWER SUPPLY (CTY+, OUT1, OUT2 TERMINAL)

(a) Turn the ignition switch on.
(b) Measure the voltage according to the value(s) in the table below.
HINT: Measure the voltage from the back side of the connector with the connector connected.

Voltage:

OK -- REPLACE SKID CONTROL ECU
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
7. INSPECT BATTERY
(a) Check the battery voltage.
Voltage:
10 to 14 V
NG -- INSPECT CHARGING SYSTEM
OK -- Continue to next step.
8. INSPECT BRAKE CONTROL POWER SUPPLY (+BC TERMINAL)

(a) Measure the voltage according to the value(s) in the table below.
HINT: Measure the voltage from the back side of the connector with the connector connected.

Voltage:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE BRAKE CONTROL POWER SUPPLY