Part 3

NETWORKING: CAN COMMUNICATION SYSTEM: U1002 (CAN MS BUS); Lost Communication with Gateway Module (Main body ECU); 2013 MY Corolla [07/2012 -]
U1002 (CAN MS BUS) - Lost Communication with Gateway Module (Main body ECU)

18. CHECK FOR SHORT TO +B IN CAN MS BUS WIRE (CAN NO. 3 JUNCTION CONNECTOR - MAIN BODY ECU)

(a) Disconnect the main body ECU connector from the main body ECU.

Text in Illustration

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

Text in Illustration

Standard Resistance:

NG -- REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 3 JUNCTION CONNECTOR - MAIN BODY ECU)

OK -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK (MAIN BODY ECU)

19. CHECK FOR SHORT TO +B IN CAN MS BUS WIRE (CAN NO. 3 JUNCTION CONNECTOR - COMBINATION METER)

(a) Disconnect the CAN No. 3 junction connector.

Text in Illustration

(b) Disconnect the combination meter connector.

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

Text in Illustration

Standard Resistance:

NG -- REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 3 JUNCTION CONNECTOR - COMBINATION METER)

OK -- REPLACE COMBINATION METER ASSEMBLY Removal

20. CHECK FOR SHORT TO GND IN CAN MS BUS WIRE (MAIN BODY ECU MAIN WIRE)

(a) Disconnect the CAN No. 3 junction connector.

Text in Illustration

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

Text in Illustration

Standard Resistance:

NG -- CHECK FOR SHORT TO GND IN CAN MS BUS WIRE (CAN NO. 3 JUNCTION CONNECTOR - MAIN BODY ECU)
OK -- Continue to next step.

21. CHECK FOR SHORT TO GND IN CAN MS BUS WIRE (COMBINATION METER MAIN WIRE)

(a) Disconnect the CAN No. 3 junction connector.

Text in Illustration

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

Text in Illustration

Standard Resistance:

NG -- CHECK FOR SHORT TO GND IN CAN MS BUS WIRE (CAN NO. 3 JUNCTION CONNECTOR - COMBINATION METER)
OK -- Continue to next step.

22. CHECK FOR SHORT TO GND IN CAN MS BUS WIRE (CAN NO. 3 JUNCTION CONNECTOR - CERTIFICATION ECU)

(a) Disconnect the certification ECU connector.

(b) Disconnect the CAN No. 3 junction connector.

Text in Illustration

Standard Resistance:

NG -- REPAIR OR REPLACE CAN MS BUS BRANCH WIRE OR CONNECTOR (CAN NO. 3 JUNCTION CONNECTOR - CERTIFICATION ECU)

OK -- REPLACE CERTIFICATION ECU

23. CHECK FOR SHORT TO GND IN CAN MS BUS WIRE (CAN NO. 3 JUNCTION CONNECTOR - COMBINATION METER)

(a) Disconnect the combination meter connector.

Text in Illustration

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

Text in Illustration

Standard Resistance:

NG -- REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 3 JUNCTION CONNECTOR - COMBINATION METER)

OK -- REPLACE COMBINATION METER ASSEMBLY Removal

24. CHECK FOR SHORT TO GND IN CAN MS BUS WIRE (CAN NO. 3 JUNCTION CONNECTOR - MAIN BODY ECU)

(a) Disconnect the main body ECU connector from the main body ECU.

Text in Illustration

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

Text in Illustration

Standard Resistance:

NG -- REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 3 JUNCTION CONNECTOR - MAIN BODY ECU)

OK -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK (MAIN BODY ECU)