Check CAN Communication Connection [11/2023 - ]: Procedure

1. Connect the GTS to the DLC3 of another vehicle.
2. Turn the ignition switch to ON.
3. Turn the GTS on.
4. Check that the GTS and ECUs can communicate with the ignition switch ON.

   HINT: 

   • ECUs and sensors are not displayed on the "Communication Bus Check" screen when the GTS cannot communicate with the vehicle.
   • If communication between the GTS and ECUs is not possible, either the GTS or vehicle has a malfunction.
   • If communication between the GTS and ECUs is still not possible even when the GTS is connected to another vehicle, the GTS has a malfunction. Perform the self tests described in the GTS operator's manual. (The GTS may be malfunctioning or its battery may be discharged.)

   Result

   Result	Proceed to
   OK (Communication between the GTS and the vehicle is not possible but communication is possible when connected to another vehicle.)	A
   NG (Communication is not possible between the GTS and the vehicle, nor between the GTS and another vehicle.)	B

Result: 

B 

REFER TO GTS OPERATOR'S MANUAL 

Result: 

A 

See step  2

1. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   H56-16 (BAT) - Body ground	Always	11 to 14 V

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1

   DLC3

2. Disconnect the cable from the negative (-) battery terminal.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H56-4 (CG) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (DLC3 POWER SOURCE CIRCUIT) 

Result: 

OK 

See step  3

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1

   DLC3

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H56-6 (CANH) - H56-14 (CANL)	Cable disconnected from negative (-) battery terminal	Below 70 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  7

Result: 

OK 

See step  4

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1

   DLC3

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H56-6 (CANH) - H56-14 (CANL)	Cable disconnected from negative (-) battery terminal	54 Ω or higher
   H56-6 (CANH) - H56-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
   H56-14 (CANL) - H56-4 (CG)
   H56-6 (CANH) - H56-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher
   H56-14 (CANL) - H56-16 (BAT)

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  6

Result: 

OK 

See step  5

1. Disconnect the H143 central gateway ECU (network gateway ECU) connector.
2. 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 Central Gateway ECU (Network Gateway ECU))

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H143-22 (GND) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

3. Reconnect the cable to the negative (-) battery terminal.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   H143-1 (BATT) - Body ground	Always	11 to 14 V
   H143-2 (ACC) - Body ground	Ignition switch ACC	11 to 14 V
   H143-19 (IGP) - Body ground	Ignition switch ON	11 to 14 V
   H143-20 (IGR) - Body ground	Ignition switch ON	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) 

Refer to REMOVAL [11/2023 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

1. Disconnect the H143 central gateway ECU (network gateway ECU) connector.
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	DLC3	-	-
   *a	Front view of wire harness connector (to Central Gateway ECU (Network Gateway ECU))	-	-

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H143-16 (CA6H) - H143-17 (CA6L)	Cable disconnected from negative (-) battery terminal	1 MΩ or higher
   H143-16 (CA6H) - H56-4 (CG)	Cable disconnected from negative (-) battery terminal	200 Ω or higher
   H143-17 (CA6L) - H56-4 (CG)
   H143-16 (CA6H) - H56-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher
   H143-17 (CA6L) - H56-16 (BAT)

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) 

Refer to REMOVAL [11/2023 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (DLC3 - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) 

1. Disconnect the H143 central gateway ECU (network gateway ECU) connector.
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	DLC3	-	-
   *a	Front view of wire harness connector (to Central Gateway ECU (Network Gateway ECU))	-	-

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H143-16 (CA6H) - H56-6 (CANH)	Cable disconnected from negative (-) battery terminal	Below 1 Ω
   H143-17 (CA6L) - H56-14 (CANL)

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) 

Refer to REMOVAL [11/2023 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - DLC3)