C1551

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: C1551: IG Power Supply Voltage Malfunction
C1551 - IG Power Supply Voltage Malfunction

DESCRIPTION

The power steering ECU determines the ignition switch to be ON or off through the IG power source circuit.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
* If the power steering ECU has been replaced with a new one, perform rotation angle sensor initialization and torque sensor zero point calibration Programming and Relearning.
* Inspection 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.

(f) Select the item "IG Power Supply" in the Data List and read the value displayed on the Techstream.

EMPS

OK:

Normal condition value is displayed on the Techstream.

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

OK -- REPLACE POWER STEERING ECU ASSEMBLY Removal

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

(a) Disconnect the C48 and A26 power steering ECU connectors.

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

Standard Voltage:

Text in Illustration

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POWER STEERING ECU ASSEMBLY Removal