Part 2
NETWORKING: CAN COMMUNICATION SYSTEM: U1002: Lost Communication with Gateway Module (Power Management1)
U1002 - Lost Communication with Gateway Module (Power Management1) Continued
16. CHECK FOR SHORT IN CAN NO. 2 BUS WIRE (CAN NO. 4 J/C - AFS ECU)
(a) Disconnect the 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 NO. 2 BUS BRANCH WIRE OR CONNECTOR (CAN NO. 4 J/C - AFS ECU)
OK -- Continue to next step.
17. CHECK FOR SHORT IN CAN NO. 2 BUS WIRE (CAN NO. 4 J/C - DRIVING SUPPORT ECU)
(a) Disconnect the driving support 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 NO. 2 BUS BRANCH WIRE OR CONNECTOR (CAN NO. 4 J/C - DRIVING SUPPORT ECU)
OK -- Continue to next step.
18. CHECK FOR SHORT IN CAN NO. 2 BUS WIRE (CAN NO. 4 J/C)
(a) Reconnect the CAN No. 4 junction connector.
(b) Measure the resistance according to the value(s) in the table below.
NOTICE:
The resistance must be measured after the main wire connected ECU and junction connector are reconnected.
Standard Resistance:
Text in Illustration
NG -- REPLACE CAN NO. 4 JUNCTION CONNECTOR
OK -- Continue to next step.
19. CHECK FOR SHORT IN CAN NO. 2 BUS WIRE (ECUS)
(a) Connect the probes of an ohmmeter to terminals 34 (CA2H) and 35 (CA2L) of the power management control ECU.
Text in Illustration
(b) While observing the resistance value shown on the tester, reconnect the each ECU connector until the resistance becomes abnormal (Below 54 Ohms).
(c) Replace the ECU that caused the total resistance to drop below 54 Ohms when it was reconnected.
HINT
If the resistance becomes abnormal when an ECU connector is reconnected, there may be a short in the ECU.
NEXT -- REPLACE CORRESPONDING ECU
20. CHECK FOR SHORT IN CAN NO. 2 BUS WIRE (CAN J/C NO. 5)
HINT
- The connectors connected to the CAN junction connectors can be distinguished according to the color of the communication bus wires.
- Reconnecting the connectors to non-specified positions on the CAN junction connectors does not affect system operation. However, it is preferred to reconnect the connectors to their original positions to avoid negative effects on the wiring such as tension on the wiring harnesses, and to make future maintenance easier.
(a) Reconnect the CAN No. 4 junction connector.
(b) Disconnect the CAN bus main wire connector from the CAN No. 5 junction connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN NO. 2 BUS MAIN WIRE OR CONNECTOR (CAN NO. 4 J/C - CAN NO. 5 J/C)
OK -- REPLACE CAN NO. 5 JUNCTION CONNECTOR
21. CHECK FOR SHORT IN CAN NO. 2 BUS WIRE (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
HINT
It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check CAN Bus Wire inspection.
Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN Bus Wire inspection.
NG -- CHECK FOR SHORT IN CAN NO. 2 BUS WIRE (CAN J/C NO. 3 MAIN WIRE)
OK -- REPLACE POWER MANAGEMENT CONTROL ECU Removal
22. CHECK FOR SHORT IN CAN NO. 2 BUS WIRE (CAN J/C NO. 3 MAIN WIRE)
(a) Reconnect the power management control ECU connector.
(b) Disconnect the CAN No. 3 junction connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
HINT
It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check CAN Bus Wire inspection.
Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN Bus Wire inspection.
Result:
C -- REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 3 J/C - POWER MANAGEMENT CONTROL ECU)
B -- CHECK FOR SHORT IN CAN NO. 2 BUS WIRE (CAN J/C NO. 4 MAIN WIRE)
A -- Continue to next step.
23. CHECK FOR SHORT IN CAN NO. 2 BUS WIRE (CAN J/C NO. 3 BRANCH WIRE)
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
HINT
It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check CAN Bus Wire inspection.
Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN Bus Wire inspection.
NG -- CHECK FOR SHORT IN CAN NO. 2 BUS WIRE (ECUS)
OK -- REPLACE CAN NO. 3 JUNCTION CONNECTOR
24. CHECK FOR SHORT IN CAN NO. 2 BUS WIRE (CAN J/C NO. 4 MAIN WIRE)
(a) Disconnect the CAN No. 4 junction connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
HINT
It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check CAN Bus Wire inspection.
Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN Bus Wire inspection.
Result:
C -- CHECK FOR SHORT IN CAN NO. 2 BUS WIRE (CAN J/C NO. 5)
B -- REPAIR OR REPLACE CAN NO. 2 BUS MAIN WIRE OR CONNECTOR (CAN NO. 3 J/C - CAN NO. 4 J/C)
A -- Continue to next step.
25. CHECK FOR SHORT IN CAN NO. 2 BUS WIRE (CAN J/C NO. 4 BRANCH WIRE)
(a) Disconnect the CAN No. 4 junction connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
HINT
It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check CAN Bus Wire inspection.
Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN Bus Wire inspection.
NG -- CHECK FOR SHORT IN CAN NO. 2 BUS WIRE (ECUS)
OK -- REPLACE CAN NO. 4 JUNCTION CONNECTOR
26. CHECK FOR SHORT IN CAN NO. 2 BUS WIRE (CAN J/C NO. 5)
HINT
- The connectors connected to the CAN junction connectors can be distinguished according to the color of the communication bus wires.
- Reconnecting the connectors to non-specified positions on the CAN junction connectors does not affect system operation. However, it is preferred to reconnect the connectors to their original positions to avoid negative effects on the wiring such as tension on the wiring harnesses, and to make future maintenance easier.
(a) Disconnect the CAN No. 5 junction connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN NO. 2 BUS MAIN WIRE OR CONNECTOR (CAN NO. 4 J/C - CAN NO. 5 J/C)
OK -- REPLACE CAN NO. 5 JUNCTION CONNECTOR
27. CHECK FOR SHORT IN CAN NO. 2 BUS WIRE (ECUS)
(a) Reconnect the connector for the bus wire that is shorted to +B or GND to the CAN junction connector (the connector that caused the bus wire resistance to change to 6 kOhms or higher (for +B short) or 200 Ohms or higher (for ground short) when it was disconnected).
(b) Disconnect the ECU or sensor connected to the CAN bus wire that is shorted to +B or GND.
HINT
If the ECU or sensor has multiple connectors, disconnect the connector that includes the CAN bus wires. To determine the ECU or sensor that is connected to the shorted bus wire, refer to the terminals of ECU tables CAN Communication System.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
HINT
If the resistance becomes normal when the connector is disconnected from the ECU, there may be a short in the ECU.
NG -- REPAIR OR REPLACE CAN NO. 2 BUS BRANCH WIRE OR CONNECTOR
OK -- REPLACE CORRESPONDING ECU