C1551

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: C1551; IG Power Supply Voltage Malfunction; 2013 MY FR-S [03/2012 -]
C1551 - IG Power Supply Voltage Malfunction

DESCRIPTION

The power steering ECU assembly determines whether the ignition switch status is ON or off through the IG power supply circuit.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
* If the power steering ECU assembly is replaced with a new one, perform rotation angle sensor initialization and torque sensor zero point calibration Programming and Relearning.
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. READ VALUE USING TECHSTREAM (IG POWER SUPPLY)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / EMPS / Data List.

EMPS

OK:

The normal condition value is displayed the Techstream.

NG -- CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BATTERY/BODY GROUND)

OK -- REPLACE POWER STEERING ECU ASSEMBLY Removal

2. CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BATTERY/BODY GROUND)

(a) Disconnect the A14 and A15 power steering ECU assembly connectors.

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

Standard Voltage:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POWER STEERING ECU ASSEMBLY Removal