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 > Smart Key System(for Entry Function, Gasoline Model): Dtc Check / Clear
DTC CHECK / CLEAR CHECK FOR DTC NOTICE: When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle ...

Toyota Avalon (XX50) 2019-2022 Owners Manual