Up to 08/2009

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


DESCRIPTION

The power steering converter assembly steps down the HV battery voltage to approximately 46 V. This voltage is then supplied to the power steering ECU to operate the motors. As a fail-safe function, when the PIG power supply and power steering converter assembly are malfunctioning, power assistance is limited/stopped.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
- If the power steering ECU has been replaced with a new one, perform the 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 (MOTOR VOLTAGE)

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

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

(d) Turn the Techstream on.

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

(f) Select the item "Motor Voltage" 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 CONVERTER - BATTERY)

OK -- REPLACE POWER STEERING ECU Removal

2. CHECK HARNESS AND CONNECTOR (POWER STEERING CONVERTER - BATTERY)

(a) Disconnect the g8 power steering converter assembly connector.





(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 -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (POWER STEERING ECU - POWER STEERING CONVERTER AND BODY GROUND)

(a) Disconnect the F10 power steering ECU connector.





(b) Disconnect the F100 power steering converter assembly connector.

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

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (POWER STEERING CONVERTER - BATTERY)

(a) Disconnect F101 power steering converter assembly connector.





(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 CONVERTER ASSEMBLY Removal