Subaru Legacy BN/BS (2015-2019) Service Manual: Electrical specification

Subaru Legacy BN/BS (2015-2019) Service Manual / Power assisted system (power steering) (diagnostics) / Control module i o signal / Electrical specification

NOTE:

The terminal numbers of the power steering control module connectors are as indicated in the figure.

Content	Connector No.	Terminal No.	Input/output signal
Content	Connector No.	Terminal No.	Measured value and measuring conditions
Power supply (IG SW)	B450	5	Battery voltage is detected with the ignition switch ON when measuring between (B450) No. 5 — (B452) No. 2.
Main torque sensor	B450	2	The voltage changes when the steering is operated to the right or left with the ignition switch ON.
Sub torque sensor	B450	1	The voltage changes when the steering is operated to the right or left with the ignition switch ON.
Torque sensor power supply	B450	6	Approximately 5 V is detected with ignition switch ON.
Torque sensor ground	B450	7	0 V is constantly detected.
CAN communication	B450	9	Digital signal; can not be measured
CAN communication	B450	10	Digital signal; can not be measured
Power supply	B452	1	Battery voltage is constantly detected when measuring between 1 — 2.
Ground	B452	2

Wiring diagram

Refer to “Electric Power Steering System” in the wiring diagram. Electric Power Steering System ...

Diagnostic procedure with diagnostic trouble code (dtc)

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Other materials:

Dtc u0401 invalid data received from ecm/pcm "a"
NOTE:Refer to “LAN SYSTEM (DIAGNOSTICS)” for diagnostic procedure. Basic Diagnostic Procedure1. OUTLINE OF DIAGNOSIS (ENGINE TYPE FB)• Detect malfunction of CAN communication.• Judge as NG when data received from ECM is not normal.2. EXECUTION CONDITION (ENGINE TYPE FB)Secon ...