POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: C1551; IG Power Supply Voltage; 2019 MY RAV4 RAV4 HV [11/2018

Last Modified: 06-02-2026	6.11:8.1.0	Doc ID: RM100000001ERXA
Model Year Start: 2019	Model: RAV4	Prod Date Range: [11/2018 - 02/2019]
Title: POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: C1551; IG Power Supply Voltage; 2019 MY RAV4 RAV4 HV [11/2018 - 02/2019]

DTC

C1551

IG Power Supply Voltage

DESCRIPTION

When a problem occurs in the power source circuit, the fail-safe function works to stop the 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 Stop and start system (w/ Stop and Start System)	EPS warning light: Comes on	The ECU judges the system has returned to normal	-

NOTICE:

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

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

(a) Disconnect the C54 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.

Tester Connection	Condition	Specified Condition
C54-4 (IG) - Body ground	Ignition switch ON	Below 18.5 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK FOR DTC

(a) Clear the DTCs.

(b) Check for DTCs.

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