C1552

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


DESCRIPTION

The power steering converter assembly boosts the PIG power supply battery voltage from 12 V 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 stops.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK CONNECTORS

(a) Check the connection of the power steering ECU connector.

(b) Visually inspect the terminals of the power steering ECU connector.

Result:





B -- CONNECT CONNECTORS CORRECTLY

C -- REPLACE POWER STEERING ECU Removal
A -- Continue to next step.

2. 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 (CONVERTER - BATTERY AND ECU)

OK -- REPLACE POWER STEERING ECU Removal

3. CHECK HARNESS AND CONNECTOR (CONVERTER - BATTERY AND ECU)

(a) Disconnect the A47 converter connector.





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

Standard voltage:





(c) Disconnect the A44 ECU connector.





(d) Disconnect the A46 converter connector.

(e) 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 (CONVERTER - BATTERY)

(a) Disconnect the A46 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