Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: IG1 Voltage Supply too High (C1417)

DESCRIPTION

If a malfunction is detected in the power supply circuit, the skid control ECU (brake actuator assembly) stores this DTC and the fail-safe function prohibits ABS operation.

This DTC is stored when the +BS terminal voltage deviates due to a malfunction in a power supply or charging system circuit such as the battery or alternator circuit, etc.

WIRING DIAGRAM

Refer to DTC C1241.

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CAUTION / NOTICE / HINT

NOTICE:

• When replacing the skid control ECU (brake actuator assembly), perform system variant learning and acceleration sensor zero point calibration.

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• Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

(a) Check the battery voltage.

Standard Voltage:

NG

CHECK OR REPLACE CHARGING SYSTEM COMPONENT OR BATTERY

OK

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector. OK: The connector is securely connected.

*a Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the A28 skid control ECU (brake actuator assembly) connector.

(c) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

OK

(a) Turn the engine switch off.

(b) Reconnect the A28 skid control ECU (brake actuator assembly) connector.

(c) Clear the DTCs.

(d) Turn the engine switch off.

(e) Start the engine.

(f) Perform a road test.

(g) Check if the same DTC is output.

A

USE SIMULATION METHOD TO CHECK

B

REPLACE BRAKE ACTUATOR ASSEMBLY