Lost Communication With Gateway Module (Power Management1)
NETWORKING: CAN COMMUNICATION SYSTEM: U1002,U0182: Lost Communication with Gateway Module (Power Management1)
DTC U1002 - Lost Communication with Gateway Module (Power Management1)
DTC U0182 - Lost Communication with AFS ECU
DESCRIPTION
- The power management control 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 No. 2 bus.
- When the power management control ECU receives a response signal from the ECUs connected to the CAN No. 2 bus, the power management control ECU recognizes and memorizes that the ECU is connected to the CAN No. 2 bus. Based on this memorized data, the power management control ECU monitors for malfunctions in the ECUs connected to the CAN No. 2 bus when communicating with those ECUs. If the power management control ECU cannot receive response signals from the ECUs that have been memorized as those connected to the CAN No. 2 bus, the power management control 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 NO. 2 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:
C -- CHECK FOR OPEN IN CAN NO. 2 BUS MAIN WIRE
B -- CHECK FOR OPEN IN CAN NO. 2 BUS MAIN WIRE
A -- Continue to next step.
2. CHECK FOR CAN NO. 2 BUS BRANCH WIRE (AFS ECU)
(a) Disconnect the AFS 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 NO. 2 BUS BRANCH WIRE OR CONNECTOR (AFS ECU)
OK -- Continue to next step.
3. CHECK WIRE HARNESS (AFS 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 -- Continue to next step.
4. REPLACE AFS ECU
(a) Replace the AFS ECU Removal.
NEXT -- Continue to next step.
5. RECONFIRM DTC OUTPUT
(a) Clear DTCs.
(b) Recheck for the DTC.
Result:
B -- REPLACE POWER MANAGEMENT CONTROL ECU
A -- END
6. CHECK FOR OPEN IN CAN NO. 2 BUS MAIN WIRE
(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 -- CHECK FOR OPEN IN CAN NO. 2 BUS MAIN WIRE
OK -- REPLACE POWER MANAGEMENT CONTROL ECU
7. CHECK FOR OPEN IN CAN NO. 2 BUS MAIN WIRE
(a) Reconnect the power management control ECU connector.
(b) Disconnect the CAN No. 3 junction connector (D69).
Text in Illustration
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE CAN NO. 2 BUS MAIN WIRE OR CONNECTOR
OK -- REPLACE JUNCTION CONNECTOR (CAN NO. 3 JUNCTION CONNECTOR)
8. CHECK FOR SHORT IN CAN NO. 2 BUS WIRE
(a) Disconnect the power management control ECU connector.
Text in Illustration
(b) 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 No. 2 Bus Wire inspection.
Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN No. 2 Bus Wire inspection.
NG -- CHECK FOR SHORT IN CAN NO. 2 BUS WIRE
OK -- REPLACE POWER MANAGEMENT CONTROL ECU
9. CHECK FOR SHORT IN CAN NO. 2 BUS WIRE
(a) Reconnect the power management control ECU connector.
(b) Disconnect the CAN No. 3 junction connector (D69).
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 No. 2 Bus Wire inspection.
Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN No. 2 Bus Wire inspection.
NG -- CHECK FOR SHORT IN CAN NO. 2 BUS WIRE
OK -- REPLACE JUNCTION CONNECTOR (CAN NO. 3 JUNCTION CONNECTOR)
10. CHECK FOR SHORT IN CAN NO. 2 BUS WIRE
(a) Reconnect the CAN No. 3 junction connector (D69).
(b) Disconnect the AFS ECU connector.
Text in Illustration
(c) Measure the resistance of the wire harness side connectors.
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 No. 2 Bus Wire inspection.
Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN No. 2 Bus Wire inspection.
NG -- CHECK FOR SHORT IN CAN NO. 2 BUS WIRE
OK -- REPLACE AFS ECU
11. CHECK FOR SHORT IN CAN NO. 2 BUS WIRE
(a) Disconnect the CAN No. 3 junction connector (D70).
Text in Illustration
(b) Measure the resistance of the wire harness side connectors.
Text in Illustration
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 No. 2 Bus Wire inspection.
Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN No. 2 Bus Wire inspection.
NG -- REPAIR OR REPLACE CAN NO. 2 BUS BRANCH WIRE OR CONNECTOR (AFS ECU)
OK -- REPLACE JUNCTION CONNECTOR (CAN NO. 3 JUNCTION CONNECTOR)