Up to 08/2009

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: C1564,C1565: Lost Communication with WDD Signal of DC / DC Converter


DESCRIPTION

Based on the WDD signal (power steering converter assembly condition notification signal) from the power steering converter assembly, the power steering ECU processes and outputs signals. Based on the ASST signal (EPS demand signal) from the power steering ECU, the power steering converter assembly processes and outputs signals. As a fail-safe function, when the system is malfunctioning, power assistance is limited.





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

(a) Disconnect the F9 power steering ECU connector.





(b) Disconnect the F101 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.

2. CHECK HARNESS AND CONNECTOR (POWER STEERING CONVERTER POWER SUPPLY)

(a) 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. REPLACE POWER STEERING CONVERTER ASSEMBLY

(a) Replace the power steering converter assembly with a new or known good one. Removal.

NEXT -- Continue to next step.

4. CHECK FOR DTC

(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

Result





B -- REPLACE POWER STEERING ECU Removal

A -- END