DTC Code | DTC Name |
---|---|
U1002 | Lost Communication with Gateway Module (Power Management1) |
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 11.
When the power management control ECU receives a response signal from the ECUs connected to sub bus 11, the power management control ECU recognizes and memorizes that the ECU is connected to sub bus 11. Based on this memorized data, the power management control ECU monitors for malfunctions in the ECUs connected to sub bus 11 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 11, the power management control ECU determines that a malfunction exists.
DTC No. | DTC Detection Condition | Trouble Area |
---|---|---|
U1002 | Power management control ECU cannot receive signals from all ECUs that have been memorized as those connected to sub bus 11. |
|
*1: w/ Pre-crash Safety System
*2: w/ Intelligent Parking Assist System
*3: w/ Lane Departure Alert System
Tech Tips
This diagnosis procedure is for when DTC U1002 is output by the power management control ECU (GTS display: PM1 Gateway).
WIRING DIAGRAM
CAUTION / NOTICE / HINT
Note
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 or any 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 Click here.
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 Click here.
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), wait at least 20 seconds, and then drive the vehicle at a speed of 50 km/h (31 mph) or more at least 1.72 seconds.
After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed Click here.
Tech Tips
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.
Connectors that connect to the CAN junction connector can be distinguished by the color of their CAN bus lines. When the connectors have been disconnected from the CAN junction connector, reconnecting the connectors to non-original positions on the CAN junction connector does not affect system performance. However, it is preferred to reconnect the connectors to their original positions to avoid negative effects on the wiring such as tension on the wire harnesses, and to make future maintenance easier.
PROCEDURE
CHECK SUB BUS 11
Disconnect the cable from the negative (-) auxiliary battery terminal.
*a | Component with harness connected (Power Management Control ECU) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Result | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
|
B |
CHECK FOR OPEN IN SUB BUS 11 MAIN LINES (POWER MANAGEMENT CONTROL ECU) Click here |
C |
CHECK FOR SHORT IN SUB BUS 11 LINES (POWER MANAGEMENT CONTROL ECU) Click here |
D |
CHECK FOR SHORT IN SUB BUS 11 BUS LINE (POWER MANAGEMENT CONTROL ECU) Click here |
A |
CHECK FOR DTC OUTPUT
Reconnect the cable to the negative (-) auxiliary battery terminal.
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Clear the DTCs.
Turn the power switch off.
Turn the power switch on (IG).
Check for DTCs.
Result | ||||||
---|---|---|---|---|---|---|
|
A |
REPLACE POWER MANAGEMENT CONTROL ECU Click here |
B |
SYMPTOM SIMULATION Click here |
CHECK FOR OPEN IN SUB BUS 11 MAIN LINES (POWER MANAGEMENT CONTROL ECU)
*a | Rear view of wire harness connector (to Power Management Control ECU) |
Disconnect the L5 power management control ECU connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
OK |
REPLACE POWER MANAGEMENT CONTROL ECU Click here |
NG |
CHECK CHECK FOR OPEN IN SUB BUS 11 MAIN LINES (CAN NO. 1 JUNCTION TERMINAL)
Reconnect the L5 power management control ECU connector.
*a | Rear view of wire harness connector (to CAN No. 1 Junction Terminal) |
Disconnect the L180 CAN No. 1 junction terminal.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
OK |
REPLACE CAN NO. 1 JUNCTION TERMINAL |
NG |
CHECK FOR OPEN IN SUB BUS 11 MAIN LINES (CAN NO. 4 JUNCTION CONNECTOR)
Reconnect the L180 CAN No. 1 junction terminal.
*a | Rear view of wire harness connector (to CAN No. 4 Junction Connector) |
*b | to Power Management Control ECU |
*c | to CAN No. 1 Junction Terminal |
Disconnect the L181 and L184 CAN No. 4 junction connectors.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Code | Color (CANH Side) | Color (CANL Side) | Connected to |
---|---|---|---|
L184 | B | G | Power management control ECU |
L181 | B | Y | CAN No. 1 junction terminal |
Note
Before disconnecting the connector, make a note of where it is connected.
Reconnect the connector to its original position.
Result | ||||||||
---|---|---|---|---|---|---|---|---|
|
A |
REPLACE CAN NO. 4 JUNCTION CONNECTOR |
B |
REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CAN NO. 4 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU) |
C |
REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CAN NO. 4 JUNCTION CONNECTOR - CAN NO. 1 JUNCTION TERMINAL) |
CHECK FOR SHORT IN SUB BUS 11 LINES (POWER MANAGEMENT CONTROL ECU)
*a | Rear view of wire harness connector (to Power Management Control ECU) |
Disconnect the L5 power management control ECU connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
OK |
REPLACE POWER MANAGEMENT CONTROL ECU Click here |
NG |
CHECK FOR SHORT IN SUB BUS 11 LINES (POWER MANAGEMENT CONTROL ECU - CAN NO. 4 JUNCTION CONNECTOR)
Reconnect the L5 power management control ECU connector.
*a | Rear view of wire harness connector (to CAN No. 4 Junction Connector) |
*b | to Power Management Control ECU |
Disconnect the L184 CAN No. 4 junction connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||
---|---|---|---|---|---|---|---|---|
|
Code | Color (CANH Side) | Color (CANL Side) | Connected to |
---|---|---|---|
L184 | B | G | Power management control ECU |
Note
Before disconnecting the connector, make a note of where it is connected.
Reconnect the connector to its original position.
NG |
REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CAN NO. 4 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU) |
OK |
CHECK FOR SHORT IN SUB BUS 11 LINES (BRANCH LINE)
Reconnect the L184 CAN No. 4 junction connector.
*a | Component with harness connector (CAN No. 4 Junction Connector) |
Connect the probes of an ohmmeter to terminals 1 (CANH) and 2 (CANL) of the power management control ECU main line harness connector.
While observing the resistance value shown on the ohmmeter, disconnect branch line connectors (L182, L183 and L185) from the CAN No. 4 junction connector until the resistance becomes normal (between 54 and 69 Ω).
*a | CAN No. 4 Junction Connector | - | - |
CAN No. 4 Junction Connector Side | Code | Color (CANH Side) | Color (CANL Side) |
---|---|---|---|
CAN main bus line (bus line connecting CAN No. 4 junction connector and CAN No. 1 junction terminal) | L181 | B | Y |
Driving support ECU assembly*1 | L182 | B | R |
Parking assist ECU*2 | L183 | B | L |
CAN main bus line (bus line connecting power management control ECU and CAN No. 1 junction terminal) | L184 | B | G |
Lane departure warning camera*3 | L185 | B | W |
*1: w/ Pre-crash Safety System
*2: w/ Intelligent Parking Assist System
*3: w/ Lane Departure Alert System
CAUTION:
Do not reconnect the disconnected connectors until this inspection is complete because there may be a short in 2 or more branch lines.
Result | ||||||
---|---|---|---|---|---|---|
|
When there is a short in one or more of the branch lines:
Reconnect all of the connectors to the CAN junction connector, except for the one that was disconnected last (the short-circuited bus line). Check that the resistance shown on the tester is normal (between 54 and 69 Ω) to confirm that there is a short in the one branch line only.
Tech Tips
Connectors that connect to the CAN junction connector can be distinguished by the color of their CAN bus lines.
Reconnecting the connectors to non-original positions on the CAN junction connector does not affect system performance. However, it is preferred to reconnect the connectors to their original positions to avoid negative effects on the wire such as tension on the wire harnesses, and to make future maintenance easier.
B |
CHECK FOR SHORT IN SUB BUS 11 LINES (ECU, SENSOR) Click here |
A |
CHECK FOR SHORT IN SUB BUS 11 LINES (CAN NO. 4 JUNCTION CONNECTOR)
Disconnect the L181 CAN No. 4 junction connector.
*a | Component with harness connector (CAN No. 4 Junction Connector) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Note
Before disconnecting the connector, make a note of where it is connected.
Reconnect the connector to its original position.
NG |
REPLACE CAN NO. 4 JUNCTION CONNECTOR |
OK |
CHECK FOR SHORT IN SUB BUS 11 LINES (CAN NO. 1 JUNCTION TERMINAL)
Reconnect the L181 CAN No. 4 junction connector.
*a | Rear view of wire harness connector (to CAN No. 1 Junction Terminal) |
Disconnect the L180 CAN No. 1 junction terminal.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
OK |
REPLACE CAN NO. 1 JUNCTION TERMINAL |
NG |
REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CAN NO. 4 JUNCTION CONNECTOR - CAN NO. 1 JUNCTION TERMINAL) |
CHECK FOR SHORT IN SUB BUS 11 LINES (ECU, SENSOR)
Reconnect the connector for the short-circuited branch line to the CAN junction connector (the connector that caused the bus line resistance to become normal (between 54 and 69 Ω) when it was disconnected).
Disconnect the connector that includes terminals CANH and CANL from the ECU to which the short-circuited branch line is connected Click here.
*a | Component with harness connector (Power Management Control ECU) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Tech Tips
If the resistance changes to normal when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.
OK |
REPLACE CORRESPONDING ECU OR SENSOR |
NG |
REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH LINES OR CONNECTOR |
CHECK FOR SHORT IN SUB BUS 11 BUS LINE (POWER MANAGEMENT CONTROL ECU)
*a | Rear view of wire harness connector (to Power Management Control ECU) |
Disconnect the L5 power management control ECU connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Tech Tips
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 11 inspection.
Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 11 inspection.
OK |
REPLACE POWER MANAGEMENT CONTROL ECU Click here |
NG |
CHECK FOR SHORT IN SUB BUS 11 LINE (CAN NO. 4 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)
*a | Rear view of wire harness connector (to CAN No. 4 Junction Connector) |
*b | to Power Management Control ECU |
Disconnect the L184 CAN No. 4 junction connector.
Note
Before disconnecting the connector, make a note of where it is connected.
Reconnect the connector to its original position.
*a | Rear view of wire harness connector (to Power Management Control ECU) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Tech Tips
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 11 inspection.
Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 11 inspection.
NG |
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 4 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU) |
OK |
CHECK FOR SHORT IN SUB BUS 11 LINE (BRANCH LINE)
Reconnect the L184 CAN No. 4 junction connector.
*a | Rear view of wire harness connector (to Power Management Control ECU) |
Connect the probes of an ohmmeter to terminals CANH or CANL and GND (E1) or +B (AM22) of the power management control ECU.
Tech Tips
It is only necessary to perform the inspection for the result (short circuit) that was obtained in the Check Sub Bus 11 Line inspection.
Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 11 inspection.
While observing the resistance value shown on the ohmmeter, disconnect branch line connectors (L182, L183 and L185) from the CAN No. 4 junction connector until the resistance becomes normal (6 kΩ or higher (for +B short) or 200 Ω or higher (for ground short)).
*a | CAN No. 4 Junction Connector | - | - |
CAN No. 4 Junction Connector Side | Code | Color (CANH Side) | Color (CANL Side) |
---|---|---|---|
CAN main bus line (bus line connecting CAN No. 4 junction connector and CAN No. 1 junction terminal) | L181 | B | Y |
Driving support ECU assembly*1 | L182 | B | R |
Parking assist ECU*2 | L183 | B | L |
CAN main bus line (bus line connecting power management control ECU and CAN No. 1 junction terminal) | L184 | B | G |
Lane departure warning camera*3 | L185 | B | W |
*1: w/ Pre-crash Safety System
*2: w/ Intelligent Parking Assist System
*3: w/ Lane Departure Alert System
Result | ||||||||
---|---|---|---|---|---|---|---|---|
|
B |
CHECK FOR SHORT IN SUB BUS 11 LINE (ECU, SENSOR) Click here |
A |
CHECK FOR SHORT IN SUB BUS 11 LINE (CAN NO. 4 JUNCTION CONNECTOR)
Disconnect the L181 CAN No. 4 junction connector.
*a | Rear view of wire harness connector (to Power Management Control ECU) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Tech Tips
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 11 inspection.
Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 11 inspection.
NG |
REPLACE CAN NO. 4 JUNCTION CONNECTOR |
OK |
CHECK FOR SHORT IN SUB BUS 11 LINE (CAN NO. 1 JUNCTION TERMINAL)
Reconnect the L181 CAN No. 4 junction connector.
Disconnect the L180 CAN No. 1 junction terminal.
*a | Rear view of wire harness connector (to Power Management Control ECU) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Tech Tips
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 11 inspection.
Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 11 inspection.
OK |
REPLACE CAN NO. 1 JUNCTION TERMINAL |
NG |
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 4 JUNCTION CONNECTOR - CAN NO. 1 JUNCTION TERMINAL) |
CHECK FOR SHORT IN SUB BUS 11 LINE (ECU, SENSOR)
Reconnect the connector for the bus line that is shorted to +B or GND to the CAN junction connector (the connector that caused the bus line resistance to change to 6 kΩ or higher (for +B short) or 200 Ω or higher (for ground short) when it was disconnected).
Disconnect the connector that includes terminals CANH and CANL from the ECU to which the bus line shorted to +B or GND is connected Click here.
*a | Rear view of wire harness connector (to Power Management Control ECU) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Tech Tips
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 11 inspection.
Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 11 inspection.
OK |
REPLACE CORRESPONDING ECU OR SENSOR |
NG |
REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH LINE OR CONNECTOR |