Power Assist System (Brush)

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for Brush Type Motor): C1552,C1554: PIG Power Supply Voltage Malfunction
C1554 - Power Supply Relay Failure

DESCRIPTION

When a problem occurs in the system, the power source relay circuit and the motor relay circuit are shut off to stop the power assist. The ECU must be replaced when there is a problem with the relays because the relays are built into the ECU.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
If the power steering ECU has been replaced with a new one, perform the assist map writing and the torque sensor zero point calibration Power Steering System (For Brush Type Motor).

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

PROCEDURE

1. READ VALUE USING TECHSTREAM

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch on (READY).

(d) Turn the Techstream on.

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

(f) Select the item "PIG power supply" in the Data List and read the value displayed on the Techstream.

EMPS

OK:

The normal condition value is displayed on the Techstream.

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

OK -- CHECK INTERMITTENT PROBLEMS

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

(a) Disconnect the connector from the power steering ECU.

(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 Removal