Toyota Venza: Lost Communication with Gateway Module (Power Management2) (U1002)

Toyota Venza Service Manual / Networking / Can Communication System / Lost Communication with Gateway Module (Power Management2) (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 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.

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 power management bus.	Open or short in power management bus main wire or connector Open or short in power management bus branch wire or connector Power management control ECU ECM Air conditioning amplifier CAN No. 1 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 BUS WIRE

(a) Turn the ignition switch off.

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

Text in Illustration

*1	Component with harness connected (Power Management Control ECU)

Standard Resistance:

Tester Connection	Condition	Specified Condition	Result
D43-12 (CA3P) - D43-11 (CA3N)	Ignition switch off	54 to 69 Ω	Below 54 Ω: Short circuit between bus wires
D43-12 (CA3P) - D43-11 (CA3N)	Ignition switch off	54 to 69 Ω	70 Ω or higher: Open circuit in a main bus wire
D43-12 (CA3P) - D43-6 (GND)	Ignition switch off	200 Ω or higher	Below 200 Ω: CANH ground short
D43-11 (CA3N) - D43-6 (GND)	Ignition switch off	200 Ω or higher	Below 200 Ω: CANL ground short

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

Standard Resistance:

Tester Connection	Condition	Specified Condition	Result
D43-12 (CA3P) - D43-1 (AM22)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short
D43-11 (CA3N) - D43-1 (AM22)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short

Tester Connection

Condition

Specified Condition

Result

D43-12 (CA3P) - D43-1 (AM22)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Below 6 kΩ:

CANH +B short

D43-11 (CA3N) - D43-1 (AM22)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Below 6 kΩ:

CANL +B short

Result	Proceed to
OK	A
Open circuit in CAN main bus wire	B
Short circuit between bus wires	C
Ground short +B short	D

REPLACE POWER MANAGEMENT CONTROL ECU

GO TO STEP 5

GO TO STEP 9

2.	CHECK FOR OPEN IN CAN BUS WIRE (POWER MANAGEMENT CONTROL ECU)

(a) Disconnect the power management control ECU connector.

Text in Illustration

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D43-12 (CA3P) - D43-11 (CA3N)	Ignition switch off	108 to 132 Ω

REPLACE POWER MANAGEMENT CONTROL ECU

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

Front view of wire harness connector

(to ECM)

for 1AR-FE

for 2GR-FE

Standard Resistance:

Tester Connection	Condition	Specified Condition
A49-12 (CANP) - A49-4 (CANN)*1	Ignition switch off	108 to 132 Ω
A41-8 (CANP) - A41-9 (CANN)*2	Ignition switch off	108 to 132 Ω

*1: for 1AR-FE

*2: for 2GR-FE

Result	Proceed to
OK (for 1AR-FE)	A
OK (for 2GR-FE)	B
NG	C

REPLACE ECM

4.	CHECK FOR OPEN IN CAN BUS WIRE (CAN NO. 1 J/C MAIN WIRE)

(a) Reconnect the ECM connector.

(b) Disconnect the CAN No. 1 junction connector (D56).

Text in Illustration

*1	Front view of wire harness connector (to CAN No. 1 Junction Connector)
*2	to Power Management Control ECU
*3	to ECM
*4	to Air Conditioning Amplifier

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D56-4 (CANH) - D56-15 (CANL)	Ignition switch off	108 to 132 Ω
D56-3 (CANH) - D56-14 (CANL)	Ignition switch off	200 Ω or higher
A44-8 (CANH) - A44-19 (CANL)	Ignition switch off	108 to 132 Ω

Result	Proceed to
OK	A
NG (to ECM main wire)	B
NG (to Power management ECU main wire)	C

REPLACE CAN NO. 1 J/C

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

REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 1 J/C - POWER MANAGEMENT CONTROL ECU)

5.	CHECK FOR SHORT IN CAN BUS WIRE (POWER MANAGEMENT CONTROL ECU)

(a) Disconnect the power management control ECU connector.

Text in Illustration

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D43-12 (CA3P) - D43-11 (CA3N)	Ignition switch off	108 to 132 Ω

REPLACE POWER MANAGEMENT CONTROL ECU

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

Front view of wire harness connector

(to ECM)

for 1AR-FE

for 2GR-FE

Standard Resistance:

Tester Connection	Condition	Specified Condition
A49-12 (CANP) - A49-4 (CANN)*1	Ignition switch off	108 to 132 Ω
A41-8 (CANP) - A41-9 (CANN)*2	Ignition switch off	108 to 132 Ω

*1: for 1AR-FE

*2: for 2GR-FE

Result	Proceed to
OK (for 1AR-FE)	A
OK (for 2GR-FE)	B
NG	C

REPLACE ECM

7.	CHECK FOR SHORT IN CAN BUS MAIN WIRE (CAN NO. 1 J/C MAIN WIRE)

(a) Reconnect the ECM connector.

(b) Disconnect the CAN No. 1 junction connector (D56).

Text in Illustration

*1	Front view of wire harness connector (to CAN No. 1 Junction Connector)
*2	to Power Management Control ECU
*3	to ECM
*4	to Air Conditioning Amplifier

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D56-4 (CANH) - D56-15 (CANL)	Ignition switch off	108 to 132 Ω
D56-3 (CANH) - D56-14 (CANL)	Ignition switch off	200 Ω or higher
A44-8 (CANH) - A44-19 (CANL)	Ignition switch off	108 to 132 Ω

Result	Proceed to
OK	A
NG (to ECM main wire)	B
NG (to Power management ECU main wire)	C
NG (to Air conditioning amplifier branch wire)	D

REPLACE CAN NO. 1 J/C

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

REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 1 J/C - POWER MANAGEMENT CONTROL ECU)

8.	CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 1 J/C - AIR CONDITIONING AMPLIFIER)

(a) Disconnect the air conditioning amplifier connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D56-3 (CANH) - D56-14 (CANL)	Ignition switch off	1 MΩ or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 1 Junction Connector)

to Air Conditioning Amplifier

REPLACE AIR CONDITIONING AMPLIFIER

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - 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

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition	Purpose
D43-12 (CA3P) - D43-6 (GND)	Ignition switch off	200 Ω or higher	Inspection for CANH ground short
D43-11 (CA3N) - D43-6 (GND)	Ignition switch off	200 Ω or higher	Inspection for CANL ground short
D43-12 (CA3P) - D43-1 (AM22)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANH +B short
D43-11 (CA3N) - 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 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.

REPLACE POWER MANAGEMENT CONTROL ECU

10.	CHECK FOR SHORT IN CAN BUS WIRES (ECM)

(a) for 1AR-FE

(1) Disconnect the ECM connectors.

Text in Illustration

*1	Front view of wire harness connector (to ECM)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition	Purpose
A49-12 (CANP) - B58-104 (E1)	Ignition switch off	200 Ω or higher	Inspection for CANH ground short
A49-4 (CANN) - B58-104 (E1)	Ignition switch off	200 Ω or higher	Inspection for CANL ground short
A49-12 (CANP) - A49-20 (BATT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANH +B short
A49-4 (CANN) - A49-20 (BATT)	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 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.

(b) for 2GR-FE

(1) Disconnect the ECM connectors.

Text in Illustration

*1	Front view of wire harness connector (to ECM)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition	Purpose
A41-8 (CANP) - B39-81 (E1)	Ignition switch off	200 Ω or higher	Inspection for CANH ground short
A41-9 (CANN) - B39-81 (E1)	Ignition switch off	200 Ω or higher	Inspection for CANL ground short
A41-8 (CANP) - A41-1 (BATT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANH +B short
A41-9 (CANN) - A41-1 (BATT)	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 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	Proceed to
OK (for 1AR-FE)	A
OK (for 2GR-FE)	B
NG	C

REPLACE ECM

11.	CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 1 J/C MAIN WIRE)

(a) Disconnect the CAN No. 1 junction connector (D56).

(b) Disconnect the CAN No. 1 junction connector (A44).

Text in Illustration

*1	Front view of wire harness connector (to CAN No. 1 Junction Connector)
*2	to Power Management Control ECU
*3	to ECM
*4	to Air Conditioning Amplifier
*5	DLC3

Standard Resistance:

Tester Connection	Condition	Specified Condition	Purpose	Connected to
D56-4 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Inspection for CANH ground short	Power management control ECU
D56-15 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Inspection for CANL ground short
D56-4 (CANH) - D1-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANH +B short
D56-15 (CANL) - D1-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANL +B short
D56-3 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Inspection for CANH ground short	Air conditioning amplifier
D56-14 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Inspection for CANL ground short
D56-3 (CANH) - D1-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANH +B short
D56-14 (CANL) - D1-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANL +B short
A44-8 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Inspection for CANH ground short	ECM
A44-19 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Inspection for CANL ground short
A44-8 (CANH) - D1-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANH +B short
A44-19 (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 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	Proceed to
OK	A
NG (to ECM main wire)	B
NG (to Power management control ECU main wire)	C
NG (to Air conditioning amplifier branch wire)	D

REPLACE CAN NO. 1 J/C

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

REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 1 J/C - POWER MANAGEMENT CONTROL ECU)

12.	CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 1 J/C - AIR CONDITIONING AMPLIFIER)

(a) Disconnect the air conditioning amplifier connector.

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

Text in Illustration

Front view of wire harness connector

(to CAN No. 1 Junction Connector)

to Air Conditioning Amplifier

DLC3

Standard Resistance:

Tester Connection	Condition	Specified Condition	Purpose
D56-3 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Inspection for CANH ground short
D56-14 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Inspection for CANL ground short
D56-3 (CANH) - D1-16 (BAT)	Cable disconnected from negative (-) battery terminal	6 kΩ or higher	Inspection for CANH +B short
D56-14 (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 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.

REPLACE AIR CONDITIONING AMPLIFIER

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - AIR CONDITIONING AMPLIFIER)

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