C1552

POWER STEERING: ELECTRONIC POWER STEERING SYSTEM: C1552,C1554: 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 FUSE (ECU-B, EPS FUSE)
(a) Check for continuity of the ECU-B and EPS fuses.
Standard resistance:
Below 1 Ohms
NG -- REPLACE FUSE
OK -- Continue to next step.
2. INSPECT ELECTRONIC POWER STEERING RELAY




(a) Remove the EPS relay from the engine room No. 1 R/B.
(b) Measure the resistance of the ESP relay.
Standard resistance:






NG -- REPLACE ELECTRONIC POWER STEERING RELAY
OK -- Continue to next step.
3. CHECK WIRE HARNESS (ELECTRONIC POWER STEERING RELAY - BATTERY)




(a) 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.
4. CHECK WIRE HARNESS (EPS RELAY - POWER STEERING ECU)




(a) Disconnect the A23 connector from the power steering ECU.
(b) Measure the resistance of the wire harness connector.
Standard resistance:





NOTICE:
If replacing the power steering ECU, 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