C1554

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: C1552, C1554: PIG Power Supply Voltage Malfunction

DESCRIPTION

When a problem occurs in the power steering system, the power source relay circuit is shut off to stop the power assist.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
If the steering column assembly or power steering ECU assembly has been replaced, perform rotation angle sensor value initialization and torque sensor zero point calibration Programming and Relearning.

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

PROCEDURE

1. READ VALUE USING TECHSTREAM (PIG POWER SUPPLY)

(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 (POWER STEERING ECU ASSEMBLY - AUXILIARY BATTERY AND BODY GROUND)

OK -- CHECK INTERMITTENT PROBLEMS How To Proceed With Troubleshooting

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

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

(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