Part 2

NETWORKING: CAN COMMUNICATION SYSTEM: Check CAN Bus Lines for Short Circuit
- Check CAN Bus Lines for Short Circuit

10. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 1 J/C - NAVIGATION ECU)

HINT
For vehicles without the navigation system, go to the next step.

(a) Disconnect the display and navigation module display (Navigation ECU) connector.

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

Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - NAVIGATION ECU)
OK -- Continue to next step.

11. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 1 J/C)

(a) Reconnect the wire harness connector to the CAN No. 1 junction connector upper side and lower side.

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

Standard Resistance:

Text in Illustration

NOTICE:
* The resistance must be measured after the main wire connected ECUs (hybrid vehicle control ECU and combination meter), CAN No. 1 junction connector, junction connector LH and RH are reconnected.
* The resistance must be measured after the CAN No. 1 junction connector branch wire connected ECU and sensor connectors are disconnected.
NG -- REPLACE CAN NO. 1 JUNCTION CONNECTOR
OK -- Continue to next step.

12. CHECK FOR SHORT IN CAN BUS WIRES (ECU, SENSOR)

(a) Connect the probes of an ohmmeter to terminals 6 (CANH) and 14 (CANL) of the DLC3.

Text in Illustration

(b) While observing the resistance value shown on the ohmmeter, reconnect each ECU and sensor connector until the resistance becomes abnormal (Below 54 Ohms).

HINT
If the resistance becomes abnormal when an ECU connector is reconnected, there may be a short in the ECU.

NEXT -- REPLACE CORRESPONDING ECU OR SENSOR

13. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 1 J/C - CAN J/C LH)

(a) Reconnect the wire harness connector to the CAN No. 1 junction connector upper side.

(b) Disconnect the instrument panel wire from the CAN junction connector LH.

Text in Illustration

NG -- REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 1 J/C - CAN J/C LH)
OK -- Continue to next step.

14. CHECK FOR SHORT IN CAN BUS WIRES (CAN J/C LH - HYBRID VEHICLE CONTROL ECU)

(a) Disconnect the engine room main wire from the CAN junction connector LH.

Text in Illustration

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

Standard Resistance:

NG -- REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN J/C LH - HYBRID VEHICLE CONTROL ECU)
OK -- Continue to next step.

15. CHECK FOR SHORT IN CAN BUS WIRES (CAN J/C LH - SKID CONTROL ECU)

(a) Disconnect the brake booster with master cylinder (skid control ECU) connector.

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

Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN J/C LH - SKID CONTROL ECU)
OK -- Continue to next step.

16. CHECK FOR SHORT IN CAN BUS WIRES (CAN J/C LH - MAIN BODY ECU)

(a) Disconnect the multiplex network body ECU (main body ECU) connector.

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

Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN J/C LH - MAIN BODY ECU)
OK -- Continue to next step.

17. CHECK FOR SHORT IN CAN BUS WIRES (CAN J/C LH)

(a) Reconnect the instrument panel wire and engine room main wire to the CAN junction connector LH.

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

Standard Resistance:

Text in Illustration

NOTICE:
* The resistance must be measured after the main wire connected ECUs (hybrid vehicle control ECU and combination meter), CAN No. 1 junction connector, junction connector LH and RH are reconnected.
* The resistance must be measured after the junction connector LH branch wire connected ECU are disconnected.
NG -- REPLACE CAN JUNCTION CONNECTOR LH
OK -- Continue to next step.

18. CHECK FOR SHORT IN CAN BUS WIRES (ECU, SENSOR)

(a) Connect the probes of an ohmmeter to terminals 6 (CANH) and 14 (CANL) of the DLC3.

Text in Illustration

(b) While observing the resistance value shown on the ohmmeter, reconnect each ECU and sensor connector until the resistance becomes abnormal (Below 54 Ohms).

HINT
If the resistance becomes abnormal when an ECU connector is reconnected, there may be a short in the ECU.

NEXT -- REPLACE CORRESPONDING ECU OR SENSOR

19. CHECK FOR SHORT IN CAN BUS WIRES (CAN J/C RH - CAN NO. 1 J/C, COMBINATION METER)

(a) Reconnect the wire harness connector to the CAN No. 1 junction connector upper side and lower side.

(b) Disconnect the instrument panel wire from the CAN junction connector RH.

Text in Illustration

Result:

C -- REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN J/C RH - COMBINATION METER)

B -- REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 1 J/C - CAN J/C RH)
A -- Continue to next step.

20. CHECK FOR SHORT IN CAN BUS WIRES (CAN J/C RH - TRANSMISSION CONTROL ECU)

(a) Disconnect the transmission control ECU connector.

(b) Disconnect the engine room main wire from the CAN junction connector RH.

Text in Illustration

NG -- REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN J/C RH - TRANSMISSION CONTROL ECU)
OK -- Continue to next step.

21. CHECK FOR SHORT IN CAN BUS WIRES (CAN J/C RH - AFS ECU)

(a) Disconnect the headlight swivel ECU (AFS ECU) connector.

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

Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN J/C RH - AFS ECU)
OK -- Continue to next step.

22. CHECK FOR SHORT IN CAN BUS WIRES (CAN J/C RH)

(a) Reconnect the instrument panel wire and engine room main wire to the CAN junction connector RH.

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

Standard Resistance:

Text in Illustration

NOTICE:
* The resistance must be measured after the main wire connected ECUs (hybrid vehicle control ECU and combination meter), CAN No. 1 junction connector, junction connector LH and RH are reconnected.
* The resistance must be measured after the junction connector RH branch wire connected ECU are disconnected.
NG -- REPLACE CAN JUNCATION CONNECTOR RH
OK -- Continue to next step.

23. CHECK FOR SHORT IN CAN BUS WIRES (ECU, SENSOR)

(a) Connect the probes of an ohmmeter to terminals 6 (CANH) and 14 (CANL) of the DLC3.

Text in Illustration