Can Communication System (For Sedan) Check Can Bus Line For Short To +B

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CAN BUS LINE FOR SHORT TO +B (DLC3 BRANCH WIRE)

CONNECT CONNECTOR

CHECK CAN BUS LINE FOR SHORT TO +B (P-CAN J/C SIDE)

CHECK CAN BUS LINE FOR SHORT TO +B (P-CAN J/C - POWER STEERING ECU)

CHECK CAN BUS LINE FOR SHORT TO +B (P-CAN J/C - MAIN BODY ECU)

CHECK CAN BUS LINE FOR SHORT TO +B (P-CAN J/C - YAW RATE SENSOR)

CHECK CAN BUS LINE FOR SHORT TO +B (P-CAN J/C - COMBINATION METER ECU)

CHECK CAN BUS LINE FOR SHORT TO +B (POWER STEERING ECU MAIN WIRE)

CHECK CAN BUS LINE FOR SHORT TO +B (MAIN BODY ECU BRANCH WIRE)

CHECK CAN BUS LINE FOR SHORT TO +B (YAW RATE SENSOR BRANCH WIRE)

CHECK CAN BUS LINE FOR SHORT TO +B (COMBINATION METER ECU BRANCH WIRE)

CONNECT CONNECTOR

CHECK CAN BUS LINE FOR SHORT TO +B (D-CAN J/C - ECM)

CHECK CAN BUS LINE FOR SHORT TO +B (D-CAN J/C - BRAKE ACTUATOR (SKID CONTROL ECU))

CHECK CAN BUS LINE FOR SHORT TO +B (D-CAN J/C - ABS AND TRACTION ACTUATOR (SKID CONTROL ECU))

CHECK CAN BUS LINE FOR SHORT TO +B (D-CAN J/C - STEERING SENSOR)

CHECK CAN BUS LINE FOR SHORT TO +B (D-CAN J/C - AIR CONDITIONING AMPLIFIER)

CHECK CAN BUS LINE FOR SHORT TO +B (D-CAN J/C - CENTER AIRBAG SENSOR ASSEMBLY)

CHECK CAN BUS LINE FOR SHORT TO +B (ECM MAIN WIRE)

CHECK CAN BUS LINE FOR SHORT TO +B (BRAKE ACTUATOR (SKID CONTROL ECU) BRANCH WIRE)

CHECK CAN BUS LINE FOR SHORT TO +B (ABS AND TRACTION ACTUATOR (SKID CONTROL ECU) BRANCH WIRE)

CHECK CAN BUS LINE FOR SHORT TO +B (STEERING SENSOR BRANCH WIRE)

CHECK CAN BUS LINE FOR SHORT TO +B (AIR CONDITIONING AMPLIFIER BRANCH WIRE)

CHECK CAN BUS LINE FOR SHORT TO +B (CENTER AIRBAG SENSOR ASSEMBLY BRANCH WIRE)

CAN COMMUNICATION SYSTEM (for Sedan) - Check CAN Bus Line for Short to +B

DESCRIPTION

There may be a short circuit between the CAN bus line and +B when no resistance exists between terminals 6 (CANH) and 16 (BAT) or terminals 14 (CANL) and 16 (BAT) of the DLC3.

Symptom	Trouble Area
No resistance exists between terminals 6 (CANH) and 16 (BAT) or 14 (CANL) and 16 (BAT) of the DLC3.	Short to +B Brake actuator (skid control ECU)*1 ABS and traction actuator (skid control ECU)*2 Power steering ECU Steering sensor*2 Yaw rate sensor*2 ECM Center airbag sensor assembly Air conditioning amplifier*3 Combination meter ECU Main body ECU

1. *1: w/ ABS
   
2. *2: w/ VSC
   
3. *3: w/ Air Conditioning or PTC Heater
   

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

1. Turn the ignition switch off before measuring the resistances of the CAN main wire and the CAN branch wire.
   
2. After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.
   
3. Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If doors need to be opened in order to check connectors, open the doors and leave them open.
   

HINT:

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

1.CHECK CAN BUS LINE FOR SHORT TO +B (DLC3 BRANCH WIRE)

1. Turn the ignition switch off.
   

2. Disconnect the D41 D-CAN junction connector.
   

   Text in Illustration

   *1	Rear view of wire harness connector (to D-CAN Junction Connector)

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D15-6 (CANH) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher
   D15-14 (CANL) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *1

   DLC3

NG	REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3 (CAN-H, CAN-L)

OK

2.CONNECT CONNECTOR

1. Reconnect the D-CAN junction connector.
   

NEXT

3.CHECK CAN BUS LINE FOR SHORT TO +B (P-CAN J/C SIDE)

1. Turn the ignition switch off.
   

2. Disconnect the D42 P-CAN junction connector.
   

   Text in Illustration

   *1	Rear view of wire harness connector (to P-CAN Junction Connector)

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D15-6 (CANH) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher
   D15-14 (CANL) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *1

   DLC3

NG	Go to step 12

OK

4.CHECK CAN BUS LINE FOR SHORT TO +B (P-CAN J/C - POWER STEERING ECU)

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

   HINT:

   The resistance must be measured after the D42 P-CAN junction connector is disconnected.

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D42-4 (EPS) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher
   D42-15 (EPS) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *1	Rear view of wire harness connector (to P-CAN Junction Connector)
   *2	DLC3

NG	Go to step 8

OK

5.CHECK CAN BUS LINE FOR SHORT TO +B (P-CAN J/C - MAIN BODY ECU)

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

   HINT:

   The resistance must be measured after the D42 P-CAN junction connector is disconnected.

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D42-5 (J/B) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher
   D42-16 (J/B) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *1	Rear view of wire harness connector (to P-CAN Junction Connector)
   *2	DLC3

NG	Go to step 9

OK

6.CHECK CAN BUS LINE FOR SHORT TO +B (P-CAN J/C - YAW RATE SENSOR)

HINT:

For vehicles without VSC, go to step 7.

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

   HINT:

   The resistance must be measured after the D42 P-CAN junction connector is disconnected.

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D42-2 (YAW) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher
   D42-13 (YAW) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *1	Rear view of wire harness connector (to P-CAN Junction Connector)
   *2	DLC3

NG	Go to step 10

OK

7.CHECK CAN BUS LINE FOR SHORT TO +B (P-CAN J/C - COMBINATION METER ECU)

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

   HINT:

   The resistance must be measured after the D42 P-CAN junction connector is disconnected.

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D42-7 (MET) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher
   D42-18 (MET) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *1	Rear view of wire harness connector (to P-CAN Junction Connector)
   *2	DLC3

NG	Go to step 11

OK
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (P-CAN J/C - D-CAN J/C (CAN-H, CAN-L))

8.CHECK CAN BUS LINE FOR SHORT TO +B (POWER STEERING ECU MAIN WIRE)

1. Disconnect the D31 power steering ECU connector.
   

   Text in Illustration

   *1	Rear view of wire harness connector (to Power Steering ECU)

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

   HINT:

   The resistance must be measured after the D42 P-CAN junction connector is disconnected.

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D42-4 (EPS) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher
   D42-15 (EPS) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *1	Rear view of wire harness connector (to P-CAN Junction Connector)
   *2	DLC3

NG	REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO POWER STEERING ECU (CAN-H, CAN-L)

OK
REPLACE POWER STEERING ECU (YARIS_NCP93 RM000001EEX046X.html)

9.CHECK CAN BUS LINE FOR SHORT TO +B (MAIN BODY ECU BRANCH WIRE)

1. Disconnect the D33 main body ECU connector.
   

   Text in Illustration

   *1	Rear view of wire harness connector (to Main Body ECU)

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

   HINT:

   The resistance must be measured after the D42 P-CAN junction connector is disconnected.

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D42-5 (J/B) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher
   D42-16 (J/B) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *1	Rear view of wire harness connector (to P-CAN Junction Connector)
   *2	DLC3

NG	REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO MAIN BODY ECU (CAN-H, CAN-L)

OK
REPLACE MAIN BODY ECU

10.CHECK CAN BUS LINE FOR SHORT TO +B (YAW RATE SENSOR BRANCH WIRE)

1. Disconnect the D81 yaw rate sensor connector.
   

   Text in Illustration

   *1	Front view of wire harness connector (to Yaw Rate Sensor)

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

   HINT:

   The resistance must be measured after the D42 P-CAN junction connector is disconnected.

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D42-2 (YAW) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher
   D42-13 (YAW) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *1	Rear view of wire harness connector (to P-CAN Junction Connector)
   *2	DLC3

NG	REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO YAW RATE SENSOR (CAN-H, CAN-L)

OK
REPLACE YAW RATE SENSOR (YARIS_NCP93 RM000001BYV012X.html)

11.CHECK CAN BUS LINE FOR SHORT TO +B (COMBINATION METER ECU BRANCH WIRE)

1. Disconnect the D1 Combination meter ECU connector.
   

   Text in Illustration

   *1	Front view of wire harness connector (to Combination Meter ECU)

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

   HINT:

   The resistance must be measured after the D42 P-CAN junction connector is disconnected.

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D42-7 (MET) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher
   D42-18 (MET) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *1	Rear view of wire harness connector (to P-CAN Junction Connector)
   *2	DLC3

NG	REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO COMBINATION METER ECU (CAN-H, CAN-L)

OK
REPLACE COMBINATION METER ECU (YARIS_NCP93 RM000000IN001JX.html)

12.CONNECT CONNECTOR

1. Reconnect the P-CAN junction connector.
   

NEXT

13.CHECK CAN BUS LINE FOR SHORT TO +B (D-CAN J/C - ECM)

1. Disconnect the D41 D-CAN junction connector.
   

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D41-4 (EFI) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher
   D41-15 (EFI) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *1	Rear view of wire harness connector (to D-CAN Junction Connector)
   *2	DLC3

NG	Go to step 19

OK

14.CHECK CAN BUS LINE FOR SHORT TO +B (D-CAN J/C - BRAKE ACTUATOR (SKID CONTROL ECU))

HINT:

For vehicles without ABS, go to step 15.

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

   HINT:

   The resistance must be measured after the D41 D-CAN junction connector is disconnected.

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D41-1 (ABS) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher
   D41-12 (ABS) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *1	Rear view of wire harness connector (to D-CAN Junction Connector)
   *2	DLC3

NG	Go to step 20

OK

15.CHECK CAN BUS LINE FOR SHORT TO +B (D-CAN J/C - ABS AND TRACTION ACTUATOR (SKID CONTROL ECU))

HINT:

For vehicles without VSC, go to step 17.

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

   HINT:

   The resistance must be measured after the D41 D-CAN junction connector is disconnected.

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D41-1 (ABS) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher
   D41-12 (ABS) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *1	Rear view of wire harness connector (to D-CAN Junction Connector)
   *2	DLC3

NG	Go to step 21

OK

16.CHECK CAN BUS LINE FOR SHORT TO +B (D-CAN J/C - STEERING SENSOR)

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

   HINT:

   The resistance must be measured after the D41 D-CAN junction connector is disconnected.

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D41-2 (STR) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher
   D41-13 (STR) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *1	Rear view of wire harness connector (to D-CAN Junction Connector)
   *2	DLC3

NG	Go to step 22

OK

17.CHECK CAN BUS LINE FOR SHORT TO +B (D-CAN J/C - AIR CONDITIONING AMPLIFIER)

HINT:

For vehicles without air conditioning or PTC heater, go to step 18.

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

   HINT:

   The resistance must be measured after the D41 D-CAN junction connector is disconnected.

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D41-6 (A/C) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher
   D41-17 (A/C) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *1	Rear view of wire harness connector (to D-CAN Junction Connector)
   *2	DLC3

NG	Go to step 23

OK

18.CHECK CAN BUS LINE FOR SHORT TO +B (D-CAN J/C - CENTER AIRBAG SENSOR ASSEMBLY)

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

   HINT:

   The resistance must be measured after the D41 D-CAN junction connector is disconnected.

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D41-8 (A/B) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher
   D41-19 (A/B) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *1	Rear view of wire harness connector (to D-CAN Junction Connector)
   *2	DLC3

NG	Go to step 24

OK
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (D-CAN J/C - P-CAN J/C)

19.CHECK CAN BUS LINE FOR SHORT TO +B (ECM MAIN WIRE)

1. Disconnect the A21 ECM connector.
   

   Text in Illustration

   *1	Front view of wire harness connector (to ECM)

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

   HINT:

   The resistance must be measured after the D41 D-CAN junction connector is disconnected.

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D41-4 (EFI) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher
   D41-15 (EFI) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *1	Rear view of wire harness connector (to D-CAN Junction Connector)
   *2	DLC3

NG	REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (CAN-H, CAN-L)

OK
REPLACE ECM (YARIS_NCP93 RM000001CN002AX.html)

20.CHECK CAN BUS LINE FOR SHORT TO +B (BRAKE ACTUATOR (SKID CONTROL ECU) BRANCH WIRE)

1. Disconnect the A15 brake actuator (skid control ECU) connector.
   

   Text in Illustration

   *1	Front view of wire harness connector (to Brake Actuator (Skid Control ECU))

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

   HINT:

   The resistance must be measured after the D41 D-CAN junction connector is disconnected.

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D41-1 (ABS) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher
   D41-12 (ABS) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *1	Rear view of wire harness connector (to D-CAN Junction Connector)
   *2	DLC3

NG	REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO BRAKE ACTUATOR (SKID CONTROL ECU) (CAN-H, CAN-L)

OK
REPLACE BRAKE ACTUATOR (SKID CONTROL ECU) (YARIS_NCP93 RM000001BXP02FX.html)

21.CHECK CAN BUS LINE FOR SHORT TO +B (ABS AND TRACTION ACTUATOR (SKID CONTROL ECU) BRANCH WIRE)

1. Disconnect the A30 ABS and traction actuator (skid control ECU) connector.
   

   Text in Illustration

   *1	Front view of wire harness connector (to ABS and Traction Actuator (Skid Control ECU))

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

   HINT:

   The resistance must be measured after the D41 D-CAN junction connector is disconnected.

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D41-1 (ABS) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher
   D41-12 (ABS) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *1	Rear view of wire harness connector (to D-CAN Junction Connector)
   *2	DLC3

NG	REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO ABS AND TRACTION ACTUATOR (SKID CONTROL ECU) (CAN-H, CAN-L)

OK
REPLACE ABS AND TRACTION ACTUATOR (SKID CONTROL ECU) (YARIS_NCP93 RM000001BXP02FX.html)

22.CHECK CAN BUS LINE FOR SHORT TO +B (STEERING SENSOR BRANCH WIRE)

1. Disconnect the D80 steering sensor connector.
   

   Text in Illustration

   *1	Front view of wire harness connector (to Steering Sensor)

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

   HINT:

   The resistance must be measured after the D41 D-CAN junction connector is disconnected.

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D41-2 (STR) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher
   D41-13 (STR) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *1	Rear view of wire harness connector (to D-CAN Junction Connector)
   *2	DLC3

NG	REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO STEERING SENSOR (CAN-H, CAN-L)

OK
REPLACE STEERING SENSOR (YARIS_NCP93 RM0000033DP00JX.html)

23.CHECK CAN BUS LINE FOR SHORT TO +B (AIR CONDITIONING AMPLIFIER BRANCH WIRE)

1. Disconnect the E8 air conditioning amplifier connector.
   

   Text in Illustration

   *1	Front view of wire harness connector (to Air Conditioning Amplifier)

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

   HINT:

   The resistance must be measured after the D41 D-CAN junction connector is disconnected.

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D41-6 (A/C) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher
   D41-17 (A/C) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *1	Rear view of wire harness connector (to D-CAN Junction Connector)
   *2	DLC3

NG	REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO AIR CONDITIONING AMPLIFIER (CAN-H, CAN-L)

OK
REPLACE AIR CONDITIONING AMPLIFIER (YARIS_NCP93 RM000001HO100MX.html)

24.CHECK CAN BUS LINE FOR SHORT TO +B (CENTER AIRBAG SENSOR ASSEMBLY BRANCH WIRE)

1. Disconnect the D16 center airbag sensor assembly connector.
   

   Text in Illustration

   *1	Rear view of wire harness connector (to Center Airbag Sensor Assembly)

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

   HINT:

   The resistance must be measured after the D41 D-CAN junction connector is disconnected.

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   D41-8 (A/B) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher
   D41-19 (A/B) - D15-16 (BAT)	Ignition switch off	6 kΩ or higher

   Text in Illustration

   *1	Rear view of wire harness connector (to D-CAN Junction Connector)
   *2	DLC3

NG	REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO CENTER AIRBAG SENSOR ASSEMBLY (CAN-H, CAN-L)

OK
REPLACE CENTER AIRBAG SENSOR ASSEMBLY (YARIS_NCP93 RM000000V6U021X.html)