Open in CAN Main Bus Line: Procedure

1. Turn the engine switch off.
2. Measure the resistance according to the value(s) in the table below.
   Fig 1: Identifying DLC3 J21 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Value	Result
   J21-6 (CANH) -J21-14 (CANL)	Engine switch off	108 to 132 Ω	A
   J21-6 (CANH) - J21-14 (CANL)	Engine switch off	133 Ω or higher	B

   NOTE:

   When the measured value is 133 Ω or more and a CAN communication system DTC is output, there may be a fault besides disconnection of the DLC3 branch line. For that reason, troubleshooting should be performed again from "HOW TO PROCEED WITH TROUBLESHOOTING". Refer to HOW TO PROCEED WITH TROUBLESHOOTING  after repairing the trouble area.

B → REPAIR OR REPLACE DLC3 BRANCH LINE OR CONNECTOR (CANH, CANL) 

A: Go to next step 

1. Perform "CAN Bus Check" using the Techstream. Refer to DIAGNOSIS SYSTEM .

   Result

   Specified Condition	Proceed to
   "Engine" and "ECT" only are not displayed	A
   "Body/Gateway" only is not displayed	B
   Others	C

B → See step   4 

C → See step   7 

A: Go to next step 

1. Turn the engine switch off.
   Fig 2: Checking For Open In CAN BUS Main Wire (ECM - CAN LH J/C)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the ECM connector (A5).
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A5-25 (CANH) - A5-24 (CANL)	Engine switch off	108 to 132 Ω

NG → REPAIR OR REPLACE CAN BUS MAIN LINE OR CONNECTOR (ECM - CAN LH J/C) 

OK → REPLACE ECM 

1. Turn the engine switch off.
   Fig 3: Checking For Open In CAN BUS Main Wire (Gateway ECU - CAN LH J/C)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the gateway ECU connector (J76).
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J76-17 (CA1H) - J76-18 (CA1L)	Engine switch off	108 to 132 Ω

OK → REPLACE GATEWAY ECU 

NG: Go to next step 

1. Reconnect the gateway ECU connector (J76).

NEXT: Go to next step 

1. Disconnect the CAN main bus line connector (J84) from the CAN RH J/C B side (w/o earth terminal).
   Fig 4: Checking For Open In CAN BUS Main Wire (CAN RH J/C - Gateway ECU)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   NOTE:

   • Before disconnecting the connector, make a note of where it is connected.
   • Reconnect the connector to its original position.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J84-1 (CANH) - J84-2 (CANL)	Engine switch off	108 to 132 Ω

NG → REPAIR OR REPLACE CAN BUS MAIN LINE OR CONNECTOR (CAN RH J/C - GATEWAY ECU) 

OK → REPAIR OR REPLACE CAN BUS MAIN LINE OR CONNECTOR (CAN LH J/C - CAN RH J/C) 

1. Turn the engine switch off.
   Fig 5: Checking For Open In CAN BUS Main Wire (ECM - CAN LH J/C)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the ECM connector (A5).
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A5-25 (CANH) - A5-24 (CANL)	Engine switch off	108 to 132 Ω

OK → REPLACE ECM 

NG: Go to next step 

1. Reconnect the ECM connector (A5).

NEXT: Go to next step 

1. Disconnect the gateway ECU connector (J76).
   Fig 6: Checking For Open In CAN BUS Main Wire (Gateway ECU - CAN LH J/C)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J76-17 (CA1H) - J76-18 (CA1L)	Engine switch off	108 to 132 Ω

OK → REPLACE GATEWAY ECU 

NG: Go to next step 

1. Reconnect the gateway ECU connector (J76).

NEXT: Go to next step 

1. Disconnect the CAN main bus line connector (J84) from the CAN RH J/C B side (w/o earth terminal).
   Fig 7: Checking For Open In CAN BUS Main Wire (CAN RH J/C - Gateway ECU)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   NOTE:

   • Before disconnecting the connector, make a note of where it is connected.
   • Reconnect the connector to its original position.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Value
   J84-1 (CANH) - J84-2 (CANL)	Engine switch off	108 to 132 Ω

NG → REPAIR OR REPLACE CAN BUS MAIN LINE OR CONNECTOR (CAN RH J/C - GATEWAY ECU) 

OK: Go to next step 

1. Reconnect the CAN main bus line connector (J84) to the CAN RH J/C B side (w/o earth terminal).

NEXT: Go to next step 

1. Disconnect the CAN main bus line connector (J2) from the CAN LH J/C A side (w/ earth terminal).
   Fig 8: Checking For Open In CAN BUS Main Wire (ECM - CAN LH J/C)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J2-1 (CANH) - J2-2 (CANL)	Engine switch off	108 to 132 Ω

NG → REPAIR OR REPLACE CAN BUS MAIN LINE OR CONNECTOR (ECM - CAN LH J/C) 

OK → REPAIR OR REPLACE CAN BUS MAIN LINE OR CONNECTOR (CAN LH J/C - CAN RH J/C)