Pre-Collision System

PRE-COLLISION: PRE-COLLISION SYSTEM:

DTC U0122 - Lost Communication with Vehicle Dynamics Control Module

DESCRIPTION

The seat belt control ECU receives signals from the skid control ECU and gateway ECU and center airbag sensor assembly and distance control ECU via CAN communication system.
The distance control ECU receives signals from the ECM via CAN communication system.

HINT: When two or more DTCs starting with "U" are output simultaneously, inspect the connectors and wire harness of each ECU.

INSPECTION PROCEDURE

PROCEDURE

1. CONFIRM MODEL
Result:

B -- CHECK OPEN IN CAN BUS WIRE (SKID CONTROL ECU BRANCH LINE)
A -- Continue to next step.
2. CHECK OPEN IN CAN BUS WIRE (SKID CONTROL ECU BRANCH LINE)
(a) Turn the engine switch off.
(b) Disconnect the skid control ECU connector (J77).

NG -- REPAIR OR REPLACE SKID CONTROL ECU BRANCH WIRE OR CONNECTOR (CAN-H, CAN-L)
OK -- Continue to next step.
3. CHECK WIRE HARNESS (IG1, GND1)
(a) Disconnect the skid control ECU connectors (J78) and (A35).

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

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE SKID CONTROL ECU
4. CHECK OPEN IN CAN BUS WIRE (SKID CONTROL ECU BRANCH LINE)
(a) Turn the engine switch off.
(b) Disconnect the skid control ECU connector (A14).

NG -- REPAIR OR REPLACE SKID CONTROL ECU BRANCH WIRE OR CONNECTOR (CAN-H, CAN-L)
OK -- Continue to next step.
5. CHECK WIRE HARNESS (IG1, GND1)

(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 SKID CONTROL ECU (BRAKE ACTUATOR)