Up to 08/2009
NETWORKING: CAN COMMUNICATION SYSTEM: U1002: Lost Communication with Gateway Module (Power Management2)
U1002 - Lost Communication with Gateway Module (Power Management2)
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 power management bus.
* When the power management control ECU receives a response signal from the ECUs connected to the power management bus, the power management control ECU recognizes and memorizes that the ECU is connected to the power management bus. Based on this memorized data, the power management control ECU monitors for malfunctions in the ECUs connected to the power management 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 power management bus, the power management control ECU determines that a malfunction exists.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
* Turn the engine switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.
* Turn the engine switch off before inspecting CAN bus wires for a ground short.
* After the engine 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 engine 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 engine 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 BUS WIRE
(a) Turn the engine switch off.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(c) Disconnect the cable from the negative (-) battery terminal.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
Result:
D -- CHECK FOR SHORT IN CAN BUS WIRES (POWER MANAGEMENT CONTROL ECU)
C -- CHECK FOR SHORT IN CAN MS BUS WIRE (POWER MANAGEMENT CONTROL ECU)
B -- CHECK FOR OPEN IN CAN BUS WIRE (POWER MANAGEMENT CONTROL ECU)
A -- REPLACE POWER MANAGEMENT CONTROL ECU Removal
2. CHECK FOR OPEN IN CAN BUS WIRE (POWER MANAGEMENT CONTROL ECU)
(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:
NG -- CHECK FOR OPEN IN CAN BUS WIRE (ECM)
OK -- REPLACE POWER MANAGEMENT CONTROL ECU Removal
3. CHECK FOR OPEN IN CAN BUS WIRE (ECM)
(a) Reconnect the power management control ECU connector.
(b) Disconnect the ECM connector.
Text in Illustration
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- CHECK FOR OPEN IN CAN BUS WIRE (CAN NO. 7 J/C MAIN WIRE)
OK -- REPLACE ECM Removal
4. CHECK FOR OPEN IN CAN BUS WIRE (CAN NO. 7 J/C MAIN WIRE)
(a) Reconnect the ECM connector.
(b) Disconnect the CAN No. 7 junction connector.
Text in Illustration
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Result:
C -- REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 7 J/C - POWER MANAGEMENT CONTROL ECU)
B -- REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 7 J/C - ECM)
A -- REPLACE CAN NO. 7 JUNCTION CONNECTOR
5. CHECK FOR SHORT IN CAN MS BUS WIRE (POWER MANAGEMENT CONTROL ECU)
(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:
NG -- CHECK FOR SHORT IN CAN BUS WIRES (ECM)
OK -- REPLACE POWER MANAGEMENT CONTROL ECU Removal
6. CHECK FOR SHORT IN CAN BUS WIRES (ECM)
(a) Reconnect the power management control ECU connector.
(b) Disconnect the ECM connector.
Text in Illustration
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- CHECK FOR SHORT IN CAN MS BUS MAIN WIRE (CAN NO. 7 J/C MAIN WIRE)
OK -- REPLACE ECM Removal
7. CHECK FOR SHORT IN CAN MS BUS MAIN WIRE (CAN NO. 7 J/C MAIN WIRE)
(a) Reconnect the ECM connector.
(b) Disconnect the CAN No. 7 junction connector.
Text in Illustration
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Result:
C -- REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 7 J/C - POWER MANAGEMENT CONTROL ECU)
B -- REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 7 J/C - ECM)
A -- Continue to next step.
8. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 7 J/C - A/C ECU)
(a) Disconnect the air conditioning amplifier connector.
(b) Disconnect the CAN No. 7 junction connector.
Text in Illustration
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 7 J/C - A/C ECU)
OK -- REPLACE AIR CONDITIONING AMPLIFIER
9. CHECK FOR SHORT IN CAN BUS WIRES (POWER MANAGEMENT CONTROL ECU)
(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 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 BUS WIRES (ECM)
OK -- REPLACE POWER MANAGEMENT CONTROL ECU Removal
10. CHECK FOR SHORT IN CAN BUS WIRES (ECM)
(a) Disconnect the ECM connectors.
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 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 BUS WIRES (CAN NO. 7 J/C MAIN WIRE)
OK -- REPLACE ECM Removal
11. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 7 J/C MAIN WIRE)
(a) Disconnect the CAN No. 7 junction 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 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. 7 J/C - POWER MANAGEMENT CONTROL ECU)
B -- REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 7 J/C - ECM)
A -- Continue to next step.
12. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 7 J/C - A/C ECU)
(a) Disconnect the air conditioning amplifier connector.
(b) Measure the resistance according to the value(s) in the table below.
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 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 -- REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 7 J/C - A/C ECU)
OK -- REPLACE AIR CONDITIONING AMPLIFIER