Lost Communication With Gateway Module (MS Bus)
NETWORKING: CAN COMMUNICATION SYSTEM: U1002,U0230: Lost Communication with Gateway Module (MS Bus)
DTC U1002 - Lost Communication with Gateway Module (MS Bus)
DTC U0230 - Lost Communication with Rear Gate Module
DESCRIPTION
- The main body ECU will store this DTC when no signals can be received from the ECUs that have been memorized as those that are connected to the CAN MS bus.
- When the main body ECU receives a response signal from the ECUs connected to the CAN MS bus, the main body ECU recognizes and memorizes that the ECU is connected to the CAN MS bus. Based on this memorized data, the main body ECU monitors for malfunctions in the ECUs connected to the CAN MS bus when communicating with those ECUs. If the main body ECU cannot receive response signals from the ECUs that have been memorized as those connected to the CAN MS bus, the main body ECU determines that a malfunction exists.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
- Turn the ignition switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.
- Turn the ignition switch off before inspecting CAN bus wires for a ground short.
- After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.
- 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 any doors need to be opened in order to check connectors, open the doors and leave them open.
HINT:
- Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
- Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.
PROCEDURE
1. CHECK CAN MS BUS WIRE
(a) Turn the ignition switch off.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
(c) Disconnect the cable from the negative (-) battery terminal.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Result:
D -- CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 4 JUNCTION CONNECTOR)
C -- CHECK FOR OPEN IN CAN MS BUS WIRE (CAN NO. 4 JUNCTION CONNECTOR)
B -- CHECK CAN MS BUS BRANCH WIRE (BACK DOOR CLOSER ECU)
A -- Continue to next step.
2. CHECK CAN MS BUS BRANCH WIRE (POWER BACK DOOR ECU)
(a) Disconnect the power back door ECU connector.
Text in Illustration
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE CAN MS BUS BRANCH WIRE OR CONNECTOR (POWER BACK DOOR ECU)
OK -- Continue to next step.
3. CHECK WIRE HARNESS (POWER BACK DOOR ECU POWER SOURCE CIRCUIT)
(a) Reconnect the cable to the negative (-) battery terminal.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MULTIPLEX NETWORK DOOR ECU (POWER BACK DOOR ECU)
4. CHECK CAN MS BUS BRANCH WIRE (BACK DOOR CLOSER ECU)
(a) Disconnect the back door closer ECU connector.
Text in Illustration
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE CAN MS BUS BRANCH WIRE OR CONNECTOR (BACK DOOR CLOSER ECU)
OK -- Continue to next step.
5. CHECK WIRE HARNESS (BACK DOOR CLOSER ECU POWER SOURCE CIRCUIT)
(a) Reconnect the cable to the negative (-) battery terminal.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MULTIPLEX NETWORK DOOR ECU (BACK DOOR CLOSER ECU)
6. CHECK FOR OPEN IN CAN MS BUS WIRE (CAN NO. 4 JUNCTION CONNECTOR)
(a) Disconnect the CAN No. 4 junction connector (L27).
Text in Illustration
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- CHECK FOR OPEN IN CAN MS BUS MAIN WIRE (MAIN BODY ECU)
OK -- REPLACE CAN NO. 4 JUNCTION CONNECTOR
7. CHECK FOR OPEN IN CAN MS BUS MAIN WIRE (MAIN BODY ECU)
(a) Reconnect the CAN No. 4 junction connector (L27).
(b) Disconnect the main body ECU connector (D48).
Text in Illustration
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR
OK -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK (MAIN BODY ECU)
8. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 4 JUNCTION CONNECTOR)
(a) Turn the ignition switch off.
(b) Disconnect the CAN No. 4 junction connector (L27).
Text in Illustration
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
HINT: It is only necessary to perform the inspection in the above table for the result (open or short circuit) that was obtained in the Check CAN MS Bus Wire inspection.
Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN MS Bus Wire inspection.
Result:
C -- CHECK FOR SHORT IN CAN MS BUS WIRES (BACK DOOR CLOSER ECU)
B -- CHECK FOR SHORT IN CAN MS BUS WIRES (POWER BACK DOOR ECU)
A -- Continue to next step.
9. CHECK FOR SHORT IN CAN MS BUS WIRES (MAIN BODY ECU)
(a) Reconnect the CAN No. 4 junction connector (L27).
(b) Disconnect the main body ECU connector (D48).
Text in Illustration
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
HINT: It is only necessary to perform the inspection in the above table for the result (open or short circuit) that was obtained in the Check CAN MS Bus Wire inspection.
Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN MS Bus Wire inspection.
NG -- REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR
OK -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK (MAIN BODY ECU)
10. CHECK FOR SHORT IN CAN MS BUS WIRES (POWER BACK DOOR ECU)
(a) Reconnect the CAN No. 4 junction connector (L27).
(b) Disconnect the power back door ECU connector.
Text in Illustration
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
HINT: It is only necessary to perform the inspection in the above table for the result (open or short circuit) that was obtained in the Check CAN MS Bus Wire inspection.
Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN MS Bus Wire inspection.
NG -- CHECK FOR CAN MS BUS BRANCH WIRE (POWER BACK DOOR ECU)
OK -- REPLACE MULTIPLEX NETWORK DOOR ECU (POWER BACK DOOR ECU)
11. CHECK FOR CAN MS BUS BRANCH WIRE (POWER BACK DOOR ECU)
(a) Disconnect the CAN No. 4 junction connector (L28).
Text in Illustration
(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 (open or short circuit) that was obtained in the Check CAN MS Bus Wire inspection.
Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN MS Bus Wire inspection.
NG -- REPAIR OR REPLACE CAN MS BUS BRANCH WIRE OR CONNECTOR (POWER BACK DOOR ECU)
OK -- REPLACE CAN NO. 4 JUNCTION CONNECTOR
12. CHECK FOR SHORT IN CAN MS BUS WIRES (BACK DOOR CLOSER ECU)
(a) Reconnect the CAN No. 4 junction connector (L27).
(b) Disconnect the back door closer ECU connector.
Text in Illustration
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
HINT: It is only necessary to perform the inspection in the above table for the result (open or short circuit) that was obtained in the Check CAN MS Bus Wire inspection.
Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN MS Bus Wire inspection.
NG -- CHECK FOR CAN MS BUS BRANCH WIRE (BACK DOOR CLOSER ECU)
OK -- REPLACE MULTIPLEX NETWORK DOOR ECU (BACK DOOR CLOSER ECU)
13. CHECK FOR CAN MS BUS BRANCH WIRE (BACK DOOR CLOSER ECU)
(a) Disconnect the CAN No. 4 junction connector (L29).
Text in Illustration
(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 (open or short circuit) that was obtained in the Check CAN MS Bus Wire inspection.
Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN MS Bus Wire inspection.
NG -- REPAIR OR REPLACE CAN MS BUS BRANCH WIRE OR CONNECTOR (BACK DOOR CLOSER ECU)
OK -- REPLACE CAN NO. 4 JUNCTION CONNECTOR