Dtc C1552 Pig Power Supply Voltage Malfunction

Lexus IS250 IS220d GSE20 ALE20 - POWER STEERING

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT FUSE (EPS FUSE)

CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BATTERY)

CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BODY GROUND)

DTC C1552 PIG Power Supply Voltage Malfunction

DESCRIPTION

This circuit supplies power to drive the power steering motor.

DTC No.DTC Detection ConditionTrouble Area
C1552This DTC is detected when power source voltage drops or remains high.
EPS fuse
Wire harness
Power steering ECU assembly

WIRING DIAGRAM

Dtc C1552 Pig Power Supply Voltage Malfunction. POWER STEERING. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

1.INSPECT FUSE (EPS FUSE)

Remove the EPS fuse from the engine room relay block.

Check for continuity of the EPS fuses.

  • OK:
  • Continuity
NG
REPLACE FUSE
OK
2.CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BATTERY)
Dtc C1552 Pig Power Supply Voltage Malfunction. POWER STEERING. Lexus IS250 IS220d GSE20 ALE20

Disconnect the A31 connector from the power steering ECU assembly.

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

  • Standard voltage:
  • Tester ConnectionConditionSpecified Condition
    A31-4 (PIG) - Body groundAlways10 to 14 V
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
3.CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BODY GROUND)
Dtc C1552 Pig Power Supply Voltage Malfunction. POWER STEERING. Lexus IS250 IS220d GSE20 ALE20

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

  • Standard resistance:
  • Tester ConnectionConditionSpecified Condition
    A31-5 (PGND) - Body groundAlwaysBlow 1 Ω
  • NOTICE:
  • If replacing the power steering ECU assembly, initialize the rotation angle sensor value and calibrate the torque sensor zero point .
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE POWER STEERING ECU ASSEMBLY