Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: IG Power Supply Voltage (C1551)

DESCRIPTION

When a malfunction is detected in the power source circuit, the fail-safe function suspends power assist.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Return-to-normal Condition	Note
C1551	IG Power Supply Voltage	When the PIG power supply voltage is normal, the IG power supply voltage is 18.5 V or higher	Harness or connector Rack and pinion power steering gear assembly	EPS warning light: Comes on	The ECU judges the system has returned to normal	-

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

If the rack and pinion power steering gear assembly has been replaced, perform assist map writing and torque sensor zero point calibration.
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Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (BATTERY - RACK AND PINION POWER STEERING GEAR ASSEMBLY)

(a) Disconnect the C67 rack and pinion power steering gear assembly connector.

Front view of wire harness connector

(to Rack and Pinion Power Steering Gear Assembly)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
C67-4 (IG) - Body ground	Engine switch on (IG)	Below 18.5 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK FOR DTC

(a) Clear the DTCs.

Chassis > EMPS > Clear DTCs

(b) Check for DTCs.

Chassis > EMPS > Trouble Codes

Result	Proceed to
DTC is output.	A
DTC is not output.	B

REPLACE RACK AND PINION POWER STEERING GEAR ASSEMBLY

USE SIMULATION METHOD TO CHECK

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Sfi System: Internal Control Module Monitoring Processor Performance Watchdog/Safety MCU Failure (P060A47)
MONITOR DESCRIPTION The main CPU and sub CPU of the ECM perform data communication between each other. The main CPU monitors the communications and WDC pulses from the sub CPU. When the signal malfunctions below are detected, this DTC is stored. DTC No. Detection Item DTC Detection Condition Trouble ...

Toyota Avalon (XX50) 2019-2022 Owners Manual