C1552

POWER STEERING: 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

PROCEDURE

1. CHECK POWER STEERING ECU (PIG TERMINAL)

(a) Disconnect the A44 ECU connector.





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

Standard voltage:





NOTICE:
If replacing the power steering ECU, initialize the rotation angle sensor value and calibrate the torque sensor zero point Power Steering System.

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 n2 power steering converter connector.





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

Standard voltage:





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 A44 power steering ECU connector.





(b) Disconnect the n3 power steering converter connector.

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

Standard resistance:





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

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

(a) Disconnect the n1 power steering converter connector.





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

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POWER STEERING CONVERTER ASSEMBLY Removal