Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001C0X8
Model Year Start: 2019 Model: GR Corolla Prod Date Range: [06/2018 - 09/2019]
Title: POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for Gasoline Model (for Hatchback)): C1551; IG Power Supply Voltage; 2019 - 2020 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 09/2019]

DTC

C1551

IG Power Supply Voltage

DESCRIPTION

The power steering ECU with motor assembly distinguishes the engine switch status as on (IG) or off through the IG power source circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Return-to-normal Condition

Note

C1551

IG Power Supply Voltage

Open or short in IG power source circuit with engine switch on (IG)
  • EPS-IG1 fuse
  • IG power source circuit
  • Power steering ECU with motor assembly

EPS warning light: Comes on

The ECU judges the system has returned to normal or the engine switch is turned on (IG) again

-

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • If the power steering ECU with motor assembly has been replaced, perform assist map writing and torque sensor zero point calibration.

    Click here 2019 - 2020 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 09/2019]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for Gasoline Model (for Hatchback)): CALIBRATION

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

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (BATTERY - POWER STEERING ECU WITH MOTOR ASSEMBLY)

(a) Disconnect the I42 and I21 power steering ECU assembly connectors.

*a

Front view of wire harness connector

(to Power Steering ECU with Motor Assembly)

-

-

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

I21-1 (IG) - Body ground

Engine switch on (IG)

8 to 16 V

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I42-2 (PGND) - Body ground

Always

Below 1 Ω
OK

REPLACE POWER STEERING ECU WITH MOTOR ASSEMBLY 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; POWER ASSIST SYSTEMS: POWER STEERING ECU: REMOVAL 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER ASSIST SYSTEMS: POWER STEERING ECU: REMOVAL 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2019]; POWER ASSIST SYSTEMS: POWER STEERING ECU: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR