C1554

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

DTC C1552 - PIG Power Supply Voltage Malfunction

DTC C1554 - Power Supply Relay Failure

DESCRIPTION

This circuit supplies power to drive the power steering motor.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT FUSES (ECU-B, EPS FUSE)
(a) Check for continuity of the ECU-B and EPS fuses.
OK:
Continuity
NG -- REPLACE FUSE
OK -- Continue to next step.

2. INSPECT ELECTRIC POWER STEERING RELAY




(a) Remove the EPS relay from the engine room R/B No.1.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- REPLACE ELECTRIC POWER STEERING RELAY
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (EPS RELAY - BATTERY)




(a) Measure the voltage according to the value(s) in the table below.
Voltage:






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

4. CHECK HARNESS AND CONNECTOR (EPS RELAY - POWER STEERING ECU ASSEMBLY)




(a) Disconnect the A23 connector from the power steering ECU assembly.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:





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

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE POWER STEERING ECU ASSEMBLY