DTC U1117: Lost Communication with Accessory Gateway [12/2013 - 11/2016]: Procedure

Body Electrical > Gateway > Trouble Codes 

1. Reconfirm DTCs.

   HINT: 

   If DTC U1002 is output from Gateway of the network gateway ECU, this indicates a sub bus 2 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in sub bus 2.

   Result

   Result	Proceed to
   U1002 is not output from network gateway ECU (Techstream display: Gateway)	A
   U1002 is output from network gateway ECU (Techstream display: Gateway)	B

Result: 

B 

Refer to  DTC U1002: Lost Communication with Gateway Module (Network Gateway ECU) [12/2013 - 11/2015]   or  DTC U1002: Lost Communication with Gateway Module (Network Gateway ECU) [11/2015 - 11/2016]  

Result: 

A 

See step  2

1. Disconnect the cable from the negative (-) battery terminal.
2. Disconnect the F91 option connector (bus buffer ECU) connector.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Option Connector (Bus Buffer ECU))

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F91-6 (CAN+) - F91-2 (CAN-)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

Result: 

OK 

REPLACE DEALER-INSTALLED OPTION 

Result: 

NG 

REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (OPTION CONNECTOR (BUS BUFFER ECU))