Toyota Venza: Lost Communication with Gateway Module (Power Management1) (U1002)

Toyota Venza Service Manual / Networking / Can Communication System / Lost Communication with Gateway Module (Power Management1) (U1002)

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.

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 the CAN No. 2 bus.	Open or short in CAN No. 2 bus main wire or connector Open or short in CAN No. 2 bus branch wire or connector AFS ECU Clearance warning ECU assembly Power management control ECU CAN No. 3 junction connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

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:

Tester Connection	Condition	Specified Condition	Result
D69-1 (CANH) - D69-2 (CANL)	Ignition switch off	54 to 69 Ω	Below 54 Ω: Short circuit between bus lines
D69-1 (CANH) - D69-2 (CANL)	Ignition switch off	54 to 69 Ω	70 Ω or higher: Open circuit in a main bus line
D69-1 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Below 200 Ω: CANH ground short
D69-2 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Below 200 Ω: CANL ground short

Text in Illustration

Component with harness connected

(CAN No. 3 Junction Connector)

Earth Terminal

DLC3

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

Standard Resistance:

Tester Connection	Condition	Specified Condition	Result
D69-1 (CANH) - D1-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short
D69-2 (CANL) - D1-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short

Tester Connection

Condition

Specified Condition

Result

D69-1 (CANH) - D1-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Below 6 kΩ:

CANH +B short

D69-2 (CANL) - D1-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Below 6 kΩ:

CANL +B short

Result	Proceed to
OK	A
Open in CAN main bus line	B
Short circuit between bus lines Ground short +B short	C

REPLACE POWER MANAGEMENT CONTROL ECU

GO TO STEP 4

2.	CHECK FOR OPEN IN CAN NO. 2 BUS MAIN WIRE (CAN NO. 3 J/C)

(a) Disconnect the CAN No. 3 junction connector (D69).

Text in Illustration

*1	Rear view of wire harness connector (to CAN No. 3 Junction Connector)
*2	Earth Terminal
*3	Red
*4	White

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D69-1 (CANH) - D69-2 (CANL)	Ignition switch off	108 to 132 Ω

REPLACE CAN NO. 3 J/C

3.	CHECK FOR OPEN IN CAN NO. 2 BUS MAIN WIRE (POWER MANAGEMENT CONTROL ECU)

(a) Reconnect the CAN No. 3 junction connector (D69).

(b) Disconnect the power management control ECU connector (D43).

Text in Illustration

*1	Rear view of wire harness connector (to Power Management Control ECU)

Standard Resistance:

Tester Connection	Condition	Specified Condition
D43-26 (CA2H) - D43-25 (CA2L)	Ignition switch off	108 to 132 Ω

REPLACE POWER MANAGEMENT CONTROL ECU

REPAIR OR REPLACE CAN NO. 2 BUS MAIN WIRE OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - CAN NO. 3 J/C)

4.	CHECK FOR SHORT IN CAN NO. 2 BUS WIRE (CAN NO. 3 J/C)

(a) Disconnect the CAN No. 3 junction connector (D69).

Text in Illustration

*1	Rear view of wire harness connector (to CAN No. 3 Junction Connector)
*2	Earth Terminal
*3	DLC3
*4	Red
*5	White

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

Standard Resistance:

Tester Connection	Condition	Specified Condition	Purpose
D69-1 (CANH) - D69-2 (CANL)	Ignition switch off	108 to 132 Ω	Inspection for open or short circuit between bus line
D69-1 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Inspection for CANH ground short
D69-2 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Inspection for CANL ground short
D69-1 (CANH) - D1-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANH +B short
D69-2 (CANL) - D1-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANL +B short

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.

GO TO STEP 9

5.	CHECK FOR SHORT IN CAN NO. 2 BUS WIRE (AFS ECU)

(a) Reconnect the CAN No. 3 junction connector (D69).

(b) Disconnect the AFS ECU connector.

Text in Illustration

*1	Front view of wire harness connector (to AFS ECU)
*2	DLC3

Standard Resistance:

Tester Connection	Condition	Specified Condition	Purpose
D44-12 (CANH) - D44-13 (CANL)	Ignition switch off	54 to 69 Ω	Inspection for open or short circuit between bus line
D44-12 (CANH) - D44-22 (E1)	Ignition switch off	200 Ω or higher	Inspection for CANH ground short
D44-13 (CANL) - D44-22 (E1)	Ignition switch off	200 Ω or higher	Inspection for CANL ground short
D44-12 (CANH) - D1-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANH +B short
D44-13 (CANL) - D1-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANL +B short

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.

REPLACE AFS ECU

6.	CHECK CAN NO. 2 BUS BRANCH WIRE (AFS ECU)

(a) Disconnect the CAN No. 3 junction connector (D70).

Text in Illustration

*1	Rear view of wire harness connector (to CAN No. 3 Junction Connector)
*2	Earth Terminal
*3	Yellow
*4	White

(b) Measure the resistance of the wire harness side connectors.

Text in Illustration

*1	Front view of wire harness connector (to AFS ECU)
*2	DLC3

Standard Resistance:

Tester Connection	Condition	Specified Condition	Purpose
D44-12 (CANH) - D44-13 (CANL)	Ignition switch off	1 MΩ or higher	Inspection for open or short circuit between bus line
D44-12 (CANH) - D44-22 (E1)	Ignition switch off	200 Ω or higher	Inspection for CANH ground short
D44-13 (CANL) - D44-22 (E1)	Ignition switch off	200 Ω or higher	Inspection for CANL ground short
D44-12 (CANH) - D1-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANH +B short
D44-13 (CANL) - D1-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANL +B short

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.

REPAIR OR REPLACE CAN NO. 2 BUS BRANCH WIRE OR CONNECTOR (AFS ECU - CAN NO. 3 J/C)

7.	CHECK FOR SHORT IN CAN NO. 2 BUS WIRE (CLEARANCE WARNING ECU ASSEMBLY)

(a) Disconnect the clearance warning ECU assembly connector.

Text in Illustration

*1	Front view of wire harness connector (to Clearance Warning ECU Assembly)
*2	DLC3

(b) Measure the resistance of the wire harness side connectors.

Standard Resistance:

Tester Connection	Condition	Specified Condition	Purpose
D79-17 (R1) - D79-18 (R2)	Ignition switch off	54 to 69 Ω	Inspection for open or short circuit between bus line
D79-17 (R1) - D79-30 (E)	Ignition switch off	200 Ω or higher	Inspection for CANH ground short
D79-18 (R2) - D79-30 (E)	Ignition switch off	200 Ω or higher	Inspection for CANL ground short
D79-17 (R1) - D1-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANH +B short
D79-18 (R2) - D1-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANL +B short

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.

REPLACE CLEARANCE WARNING ECU ASSEMBLY

8.	CHECK CAN NO. 2 BUS BRANCH WIRE (CLEARANCE WARNING ECU ASSEMBLY)

(a) Disconnect the CAN No. 3 junction connector (D81).

Text in Illustration

*1	Rear view of wire harness connector (to CAN No. 3 Junction Connector)
*2	Earth Terminal
*3	Red
*4	White

(b) Measure the resistance of the wire harness side connectors.

Text in Illustration

*1	Front view of wire harness connector (to Clearance Warning ECU Assembly)
*2	DLC3

Standard Resistance:

Tester Connection	Condition	Specified Condition	Purpose
D79-17 (R1) - D79-18 (R2)	Ignition switch off	1 MΩ or higher	Inspection for open or short circuit between bus line
D79-17 (R1) - D79-30 (E)	Ignition switch off	200 Ω or higher	Inspection for CANH ground short
D79-18 (R2) - D79-30 (E)	Ignition switch off	200 Ω or higher	Inspection for CANL ground short
D79-17 (R1) - D1-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANH +B short
D79-18 (R2) - D1-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANL +B short

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.

REPLACE CAN NO. 3 J/C

REPAIR OR REPLACE CAN NO. 2 BUS BRANCH WIRE OR CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - CAN NO. 3 J/C)

9.	CHECK FOR SHORT IN CAN NO. 2 BUS WIRE (POWER MANAGEMENT CONTROL ECU)

(a) Reconnect the CAN No. 3 junction connector (D69).

(b) Disconnect the power management control ECU connector.

Text in Illustration

*1	Rear view of wire harness connector (to Power Management Control ECU)

Standard Resistance:

Tester Connection	Condition	Specified Condition	Purpose
D43-26 (CA2H) - D43-25 (CA2L)	Ignition switch off	108 to 132 Ω	Inspection for open or short circuit between bus line
D43-26 (CA2H) - D43-6 (GND)	Ignition switch off	200 Ω or higher	Inspection for CANH ground short
D43-25 (CA2L) - D43-6 (GND)	Ignition switch off	200 Ω or higher	Inspection for CANL ground short
D43-26 (CA2H) - D43-1 (AM22)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANH +B short
D43-25 (CA2L) - D43-1 (AM22)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANL +B short

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.

REPLACE POWER MANAGEMENT CONTROL ECU

REPAIR OR REPLACE CAN NO. 2 BUS MAIN WIRE OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - CAN NO. 3 J/C)

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