Power Management2

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 sub bus 12.

* When the power management control ECU receives a response signal from the ECUs connected to sub bus 12, the power management control ECU recognizes and memorizes that the ECU is connected to sub bus 12. Based on this memorized data, the power management control ECU monitors for malfunctions in the ECUs connected to sub bus 12 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 sub bus 12, the power management control ECU determines that a malfunction exists.

HINT
This diagnosis procedure is for when DTC U1002 is output by the power management control ECU (Techstream display: PM2 Gateway).

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
* Before measuring the resistance of the CAN bus, turn the power switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
* After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Service Precautions.
* Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output How to Proceed With Troubleshooting.
* After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
* DTC check procedure: Turn the power switch on (IG) and wait at least 20 seconds.
* After the repair, perform CAN Bus Check and check that all the ECUs and sensors connected to the CAN communication system are displayed Diagnosis System.

HINT
* Operating the power 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 SUB BUS 12

(a) Disconnect the cable from the negative (-) auxiliary battery terminal.

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

Standard Resistance:

Text in Illustration

HINT
When the value is as specified, clear and recheck for DTCs. When no DTCs are output, check for malfunctions such as damage or improper connection of the relevant connectors.

Result:

B -- CHECK FOR OPEN IN SUB BUS 12 LINES (POWER MANAGEMENT CONTROL ECU)

C -- CHECK FOR SHORT IN SUB BUS 12 LINES (POWER MANAGEMENT CONTROL ECU)

D -- CHECK FOR SHORT IN SUB BUS 12 LINE (POWER MANAGEMENT CONTROL ECU)

A -- REPLACE POWER MANAGEMENT CONTROL ECU Removal

2. CHECK FOR OPEN IN SUB BUS 12 LINES (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

NG -- CHECK FOR OPEN IN SUB BUS 12 LINES (CAN NO. 5 J/C - CAN NO. 1 J/C)

OK -- REPLACE POWER MANAGEMENT CONTROL ECU Removal

3. CHECK FOR OPEN IN SUB BUS 12 LINES (CAN NO. 5 J/C - CAN NO. 1 J/C)

(a) Reconnect the power management control ECU connector.

(b) Disconnect the wire harness connector from the CAN No. 5 junction connector (instrument panel connector holder left side).

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

Standard Resistance:

Text in Illustration

NG -- CHECK FOR OPEN IN SUB BUS 12 LINES (CAN NO. 1 J/C - CAN NO. 5 J/C)
OK -- Continue to next step.

4. CHECK FOR OPEN IN SUB BUS 12 LINES (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)

(a) Reconnect the wire harness connector to the CAN No. 5 junction connector (instrument panel connector holder left side).

(b) Disconnect the wire harness connector from the CAN No. 5 junction connector (instrument panel connector holder right side).

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

Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)

OK -- REPLACE CAN NO. 5 JUNCTION CONNECTOR

5. CHECK FOR OPEN IN SUB BUS 12 LINES (CAN NO. 1 J/C - CAN NO. 5 J/C)

(a) Reconnect the wire harness connector to the CAN No. 5 junction connector (instrument panel connector holder left side).

(b) Disconnect the wire harness connector from the CAN No. 1 junction connector (instrument panel wire side).

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

Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 1 J/C - CAN NO. 5 J/C)
OK -- Continue to next step.

6. CHECK FOR OPEN IN SUB BUS 12 LINES (CAN NO. 1 J/C - ECM)

(a) Reconnect the wire harness connector to the CAN No. 1 junction connector (instrument panel wire side).

(b) Disconnect the wire harness connector from the CAN No. 1 junction connector (engine room main wire side).

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

Standard Resistance:

Text in Illustration

NG -- CHECK FOR OPEN IN SUB BUS 12 LINES (ECM)

OK -- REPLACE CAN NO. 1 JUNCTION CONNECTOR

7. CHECK FOR OPEN IN SUB BUS 12 LINES (ECM)

(a) Reconnect the wire harness connector to the CAN No. 1 junction connector (engine room main wire side).

(b) Disconnect the ECM connector.

Text in Illustration

NG -- REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 1 J/C - ECM)

OK -- REPLACE ECM Removal

8. CHECK FOR SHORT IN SUB BUS 12 LINES (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

NG -- CHECK FOR SHORT IN SUB BUS 12 LINES (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)

OK -- REPLACE POWER MANAGEMENT CONTROL ECU Removal

9. CHECK FOR SHORT IN SUB BUS 12 LINES (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)

(a) Reconnect the power management control ECU connector.

(b) Disconnect the wire harness connector from the CAN No. 5 junction connector (instrument panel connector holder right side).

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

Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)
OK -- Continue to next step.

10. CHECK FOR SHORT IN SUB BUS 12 LINES (CAN NO. 5 J/C)

(a) Disconnect the wire harness connector from the CAN No. 5 junction connector (instrument panel connector holder left side).

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

Standard Resistance:

Text in Illustration

Result:

B -- CHECK FOR SHORT IN SUB BUS 12 LINES (CAN NO. 1 J/C - CAN NO. 5 J/C)

C -- CHECK FOR SHORT IN SUB BUS 12 LINES (ECUS)

A -- REPLACE CAN NO. 5 JUNCTION CONNECTOR

11. CHECK FOR SHORT IN SUB BUS 12 LINES (CAN NO. 1 J/C - CAN NO. 5 J/C)

(a) Disconnect the wire harness connector from the CAN No. 1 junction connector (instrument panel wire side).

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

Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 1 J/C - CAN NO. 5 J/C)
OK -- Continue to next step.

12. CHECK FOR SHORT IN SUB BUS 12 LINES (CAN NO. 1 J/C)

(a) Disconnect the wire harness connector from the CAN No. 1 junction connector (engine room main wire side).

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

Standard Resistance:

Text in Illustration

NG -- CHECK FOR SHORT IN SUB BUS 12 LINES (ECUS)

OK -- REPLACE CAN NO. 1 JUNCTION CONNECTOR

13. CHECK FOR SHORT IN SUB BUS 12 LINES (ECUS)

(a) Reconnect all wire harness connectors (CAN junction connector 1 and CAN junction connector 5).

(b) Disconnect the connector that includes terminals CANH and CANL from the ECU (or sensor) to which the short circuited branch line is connected 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 (between 54 and 69 Ohms) when the connector is disconnected from the ECU (or sensor), there may be a short in the ECU (or sensor).
* If the resistance does not become normal (between 54 and 69 Ohms) when the connector is disconnected from the ECU (or sensor), repair or replace the short circuited branch line or connector.

NG -- REPAIR OR REPLACE CORRESPONDING ECU WIRE

OK -- REPLACE CORRESPONDING ECU

14. CHECK FOR SHORT IN SUB BUS 12 LINE (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 Sub Bus 12 inspection.
* Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 12 inspection.

NG -- CHECK FOR SHORT IN SUB BUS 12 LINE (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)

OK -- REPLACE POWER MANAGEMENT CONTROL ECU Removal

15. CHECK FOR SHORT IN SUB BUS 12 LINE (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)

(a) Disconnect the wire harness connector from the CAN No. 5 junction connector (instrument panel connector holder right side).

(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 Sub Bus 12 inspection.
* Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 12 inspection.

NG -- REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)
OK -- Continue to next step.

16. CHECK FOR SHORT IN SUB BUS 12 LINE (CAN NO. 5 J/C)

(a) Disconnect the wire harness connector from the CAN No. 5 junction connector (instrument panel connector holder left side).

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

Standard Resistance:

Text in Illustration

Result:

HINT
* It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 12 inspection.
* Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 12 inspection.

B -- CHECK FOR SHORT IN SUB BUS 12 LINE (CAN NO. 1 J/C - CAN NO. 5 J/C)

C -- CHECK SUB BUS 12 LINE (ECU)

A -- REPLACE CAN NO. 5 JUNCTION CONNECTOR

17. CHECK FOR SHORT IN SUB BUS 12 LINE (CAN NO. 1 J/C - CAN NO. 5 J/C)

(a) Disconnect the wire harness connector from the CAN No. 1 junction connector (instrument panel wire side).

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

Standard Resistance:

NG -- REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 1 J/C - CAN NO. 5 J/C)
OK -- Continue to next step.

18. CHECK SHORT IN SUB BUS 12 LINE (CAN NO. 1 J/C)

(a) Disconnect the wire harness connector from the CAN No. 1 junction connector (engine room main wire side).

(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 Sub Bus 12 inspection.
* Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check Sub Bus 12 inspection.

NG -- CHECK SUB BUS 12 LINE (ECU)

OK -- REPLACE CAN NO. 1 JUNCTION CONNECTOR

19. CHECK SUB BUS 12 LINE (ECU)

(a) Disconnect the connector that includes terminals CANH and CANL from the ECU to which the bus line shorted to +B or shorted to GND is connected.

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

Standard Resistance:

Text in Illustration