Lost Communication between VGRS and EPS - Variable Gear Ratio Steering System

STEERING COLUMN: VARIABLE GEAR RATIO STEERING SYSTEM: C1597/57: Lost Communication between VGRS and EPS

DTC C1597/57 - Lost Communication between VGRS and EPS

DESCRIPTION

The steering control ECU receives signals from the power steering ECU via local CAN communication.
If the steering control ECU cannot receive signals from the power steering ECU correctly via local CAN communication, it will store DTC C1597/57.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK WIRE HARNESS





(a) Disconnect the connectors from the steering control ECU and the power steering ECU.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- Continue to next step.
2. REPLACE POWER STEERING ECU
(a) Replace the power steering ECU.
(b) Connect the connectors to the steering control ECU and the power steering ECU.
(c) Check for DTCs in the steering control ECU Variable Gear Ratio Steering System.
OK:
DTC C1597/57 is not output.
NG -- REPLACE STEERING CONTROL ECU
OK -- END