DTC U1117: Lost Communication with Accessory Gateway [06/2014 - 10/2016]: 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
   DTC U1002 is not output from network gateway ECU (Techstream display: Gateway)	A
   DTC U1002 is output from network gateway ECU (Techstream display: Gateway)	B

Result: 

B 

GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC. Refer to  DTC U1002: Lost Communication with Gateway Module (Network Gateway ECU) [06/2014 - 10/2016] 

Result: 

A 

See step  2

1. Disconnect the cable from the negative (-) battery terminal.
2. Disconnect the K102 option connector (bus buffer ECU) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K102-4 (CAN+) - K102-8 (CAN-)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

   Result

   Result
   OK
   NG

Result: 

NG 

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

Result: 

OK 

See step  3

1. 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
   K102-7 (RGN1) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

2. Reconnect the cable to the negative (-) battery terminal.
3. Measure the voltage 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 Voltage

   Tester Connection	Condition	Specified Condition
   K102-1 (R+B) - Body ground	Always	11 to 14 V

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE DEALER-INSTALLED OPTION 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)