54A-DTC U1190 No receive fault detect signal

DTC U1190 No receive fault detect signal

caution

If DTC U1190 is set in the BSW-ECU (master), always diagnose the CAN bus line.
Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.

OPERATION

The BSW-ECU (master) communicates with the ETACS-ECU via the gateway-ECU and CAN bus lines.

DIAGNOSTIC FUNCTION AND TROUBLE JUDGMENT

When the BSW-ECU (master) cannot receive any fault detect signal from the ETACS-ECU within 5 seconds after the ignition switch is turned on, the ECU sets DTC U1190.

TROUBLESHOOTING HINTS

Malfunction of the ETACS-ECU
Malfunction of the BSW-ECU (master)

DIAGNOSIS

1. Using scan tool (M.U.T.-IIISE), diagnose the CAN bus line.

2. Check if DTC U1190 is set in the gateway-ECU.

3. Check whether the DTC is set again.