Diesel Data: Automotive Repair

Power Steering ECU Communication Stop Mode








CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: Power Steering ECU Communication Stop Mode

Power Steering ECU Communication Stop Mode

DESCRIPTION





HINT: "EPS" refers to the circuit that includes the power steering ECU.

WIRING DIAGRAM





INSPECTION PROCEDURE
NOTICE:
- Turn the power switch off before measuring the resistances of CAN bus main wires and CAN bus branch wires.
- After the power switch is turned off, check that the key reminder warning system and lighting system are not operating.
- Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power switch, any other switches, or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.
HINT: Operating the power switch, any other switches, or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

PROCEDURE

1. CHECK OPEN IN CAN BUS WIRE (POWER STEERING ECU BRANCH WIRE)
(a) Turn the power switch off.
(b) Disconnect power steering ECU connector A66.




(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE POWER STEERING ECU BRANCH WIRE OR CONNECTOR (CANH, CANL)
OK -- Continue to next step.
2. CHECK WIRE HARNESS (IG, PGND)




(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:






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