Lost Communication with Gateway Module (Power Management2)
NETWORKING: CAN COMMUNICATION SYSTEM: U1002: Lost Communication with Gateway Module (Power Management2)
U1002 - Lost Communication with Gateway Module (Power Management2)
DESCRIPTION
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. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.
NEXT -- Continue to next step.
2. CHECK CAN BUS WIRE (MAIN WIRE FOR DISCONNECTION, BUS LINE FOR SHORT CIRCUIT)
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
Result
C -- CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY AND BODY GROUND)
B -- CHECK FOR SHORT IN CAN BUS MAIN WIRES (NO. 3 JUNCTION CONNECTOR - ECM)
A -- Continue to next step.
3. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - ECM)
(a) Disconnect the D127 No. 3 junction connector connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- CONNECT CONNECTOR
OK -- Continue to next step.
4. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)
(a) Disconnect the D127 No. 3 junction connector connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- CONNECT CONNECTOR
OK -- REPAIR OR REPLACE NO. 3 JUNCTION CONNECTOR
5. CONNECT CONNECTOR
(a) Reconnect the D127 No. 3 junction connector.
NEXT -- Continue to next step.
6. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - ECM)
(a) Disconnect the A39 ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - ECM)
OK -- REPLACE ECM Removal
7. CONNECT CONNECTOR
(a) Reconnect the D127 No. 3 junction connector.
NEXT -- Continue to next step.
8. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)
(a) Disconnect the D89 power management control 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 MAIN WIRE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)
OK -- REPLACE POWER MANAGEMENT CONTROL ECU Removal
9. CHECK FOR SHORT IN CAN BUS MAIN WIRES (NO. 3 JUNCTION CONNECTOR - ECM)
(a) Disconnect the D127 No. 3 junction connector connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- CONNECT CONNECTOR
OK -- Continue to next step.
10. CHECK FOR SHORT IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)
(a) Disconnect the D127 No. 3 junction connector connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- CONNECT CONNECTOR
OK -- Continue to next step.
11. CHECK FOR SHORT IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER)
(a) Disconnect the D127 No. 3 junction connector connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- CONNECT CONNECTOR
OK -- REPAIR OR REPLACE NO. 3 JUNCTION CONNECTOR
12. CONNECT CONNECTOR
(a) Reconnect the D127 No. 3 junction connector.
NEXT -- Continue to next step.
13. CHECK FOR SHORT IN CAN BUS MAIN WIRE (ECM)
(a) Disconnect the A39 ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - ECM)
OK -- REPLACE ECM Removal
14. CONNECT CONNECTOR
(a) Reconnect the D127 No. 3 CAN junction connector.
NEXT -- Continue to next step.
15. CHECK FOR SHORT IN CAN BUS MAIN WIRE (POWER MANAGEMENT CONTROL ECU)
(a) Disconnect the D89 power management control 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 MAIN WIRE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)
OK -- REPLACE POWER MANAGEMENT CONTROL ECU Removal
16. CONNECT CONNECTOR
(a) Reconnect the D127 No. 3 junction connector.
NEXT -- Continue to next step.
17. CHECK FOR SHORT IN CAN BUS WIRE (AIR CONDITIONING AMPLIFIER)
(a) Disconnect the D75 air conditioning amplifier.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER)
OK -- REPLACE AIR CONDITIONING AMPLIFIER
18. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY AND BODY GROUND)
(a) Connect the cable to the negative (-) battery terminal.
NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.
(b) Disconnect the D89 power management control ECU.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE POWER MANAGEMENT CONTROL ECU Removal