C1554

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for 2ZR-FE): C1552,C1554: PIG Power Supply Voltage Malfunction
C1554 - Power Supply Relay Failure

DESCRIPTION

When a problem occurs in the system, the power source relay circuit and the motor relay circuit are shut off to stop the power assist. The ECU must be replaced when there is a problem with the relays because the relays are built into the ECU.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
If the power steering ECU has been replaced with a new one, perform the assist map writing and the torque sensor zero point calibration Programming and Relearning.

PROCEDURE

1. INSPECT FUSE (EPS FUSE)

(a) Remove the EPS fuse from the engine room relay block.

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

Standard Resistance:





NG -- REPLACE FUSE
OK -- Continue to next step.

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

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





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

Standard Voltage:





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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POWER STEERING ECU Removal