Part 4

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

16. CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 1 J/C)

(a) Reconnect the instrument panel wire and engine room main wire to the CAN No. 1 junction connector.

(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 line connected ECUs (ECM and combination meter assembly), CAN No. 1 junction connector, CAN No. 2 junction connector and CAN No. 3 junction connector are reconnected.
* The resistance must be measured after the CAN No. 1 junction connector branch line connected ECU are disconnected.

NG -- REPLACE CAN NO. 1 JUNCTION CONNECTOR
OK -- Continue to next step.

17. CHECK FOR SHORT IN CONNECTED COMPONENT (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

18. CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 3 J/C - CAN NO. 2 J/C)

(a) Reconnect the wire harness connector to the CAN No. 2 junction connector rear side.

(b) Disconnect the instrument panel wire from the CAN No. 3 junction connector.

Text in Illustration

NG -- REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 2 J/C - CAN NO. 3 J/C)
OK -- Continue to next step.

19. CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 3 J/C - COMBINATION METER ASSEMBLY)

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

Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 3 J/C - COMBINATION METER ASSEMBLY)
OK -- Continue to next step.

20. CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 3 J/C - POWER MANAGEMENT CONTROL ECU)

(a) Disconnect the power management 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 BRANCH LINE OR CONNECTOR (CAN NO. 3 J/C - POWER MANAGEMENT CONTROL ECU)
OK -- Continue to next step.

21. CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 3 J/C - TRANSMISSION CONTROL ECU ASSEMBLY)

(a) Disconnect the transmission control ECU assembly connector.

(b) Disconnect the engine room main wire from the CAN No. 3 junction connector.

Text in Illustration

NG -- REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (CAN NO. 3 J/C - TRANSMISSION CONTROL ECU ASSEMBLY)
OK -- Continue to next step.

22. CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 3 J/C)

(a) Reconnect the instrument panel wire and engine room main wire to the CAN No. 3 junction connector.

(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 line connected ECUs (ECM and combination meter assembly), CAN No. 1 junction connector, CAN No. 2 junction connector and CAN No. 3 junction connector are reconnected.
* The resistance must be measured after the CAN No. 3 junction connector branch line connected ECU are disconnected.

NG -- REPLACE CAN NO. 3 JUNCTION CONNECTOR
OK -- Continue to next step.

23. CHECK FOR SHORT IN CONNECTED COMPONENT (ECU, SENSOR)

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

Text in Illustration