Toyota 4Runner: Lost Communication with Gateway Module (Power Management2) (U1002)

Toyota 4Runner Service Manual / Power Source / Network / Networking / Can Communication System / Lost Communication with Gateway Module (Power Management2) (U1002)

DESCRIPTION

The power management control ECU stores this DTC when no signals can be received from the ECUs that are memorized as those 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 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 are memorized as those connected to the power management bus, the power management control ECU determines that a malfunction exists.
If 2 or more DTCs are output during the DTC check, one side of the CAN branch wire may be open (one side of the CANH [branch wire]/CANL [branch wire] of the ECU and/or sensor is open).

DTC Code	DTC Detection Condition	Trouble Area
U1002	Lost communication with the gateway module (Power Management2).	Power management bus circuit Air conditioning amplifier assembly branch wire or connector Power management control ECU main wire or connector ECM main wire or connector Air conditioning amplifier assembly Power management control ECU ECM No. 3 junction connector

HINT:

For vehicles with a smart key system only.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT:

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

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 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 (See page ).

2.	CHECK FOR 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:

Tester Connection	Switch Condition	Specified Condition	Resistance: Malfunction
F80-12 (CA3P) - F80-11 (CA3N)	Ignition switch off	54 to 69 Ω	Below 54 Ω: Short in line
F80-12 (CA3P) - F80-11 (CA3N)	Ignition switch off	54 to 69 Ω	Higher than 69 Ω: Open in CAN main bus line
F80-12 (CA3P) - F80-1 (AM22)	Ignition switch off	6 kΩ or higher	Below 6 kΩ: +B short
F80-11 (CA3N) - F80-1 (AM22)	Ignition switch off	6 kΩ or higher	Below 6 kΩ: +B short
F80-12 (CA3P) - F80-6 (GND)	Ignition switch off	200 Ω or higher	Below 200 Ω: Ground short
F80-11 (CA3N) - F80-6 (GND)	Ignition switch off	200 Ω or higher	Below 200 Ω: Ground short

Text in Illustration

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

Result

Proceed to

- Open in CAN main bus line

- Short in line

- +B short

- Ground short

GO TO STEP 9

GO TO STEP 18

3.	CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - ECM)

(a) Disconnect the F83 No. 3 junction connector connector.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
F83-1 (CANH) - F83-12 (CANL)	Ignition switch off	108 to 132 Ω

Text in Illustration

*a	Rear view of wire harness connector (to No. 3 Junction Connector)

GO TO STEP 5

4.	CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
F83-2 (CANH) - F83-13 (CANL)	Ignition switch off	108 to 132 Ω

Text in Illustration

*a	Rear view of wire harness connector (to No. 3 Junction Connector)

REPAIR OR REPLACE NO. 3 JUNCTION CONNECTOR

GO TO STEP 7

5.	CONNECT CONNECTOR

(a) Reconnect the F83 No. 3 junction connector connector.

6.	CHECK FOR OPEN IN CAN BUS MAIN WIRE (ECM - NO. 3 JUNCTION CONNECTOR)

(a) Disconnect the F50 ECM connector.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
F50-34 (CANP) - F50-33 (CANN)	Ignition switch off	108 to 132 Ω

Text in Illustration

*a	Rear view of wire harness connector (to ECM)

REPLACE ECM

REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (ECM - NO. 3 JUNCTION CONNECTOR)

7.	CONNECT CONNECTOR

(a) Reconnect the F83 No. 3 junction connector connector.

8.	CHECK FOR OPEN IN CAN BUS MAIN WIRE (POWER MANAGEMENT CONTROL ECU - NO. 3 JUNCTION CONNECTOR)

(a) Disconnect the F80 power management control ECU connector.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
F80-12 (CA3P) - F80-11 (CA3N)	Ignition switch off	108 to 132 Ω

Text in Illustration

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

REPLACE POWER MANAGEMENT CONTROL ECU

REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO POWER MANAGEMENT CONTROL ECU (POWER MANAGEMENT CONTROL ECU - NO. 3 JUNCTION CONNECTOR)

9.	CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the F83 No. 3 junction connector connector.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
F83-3 (CANH) - F83-14 (CANL)	Ignition switch off	200 Ω or higher
F83-3 (CANH) - F13-4 (CG)	Ignition switch off	200 Ω or higher
F83-14 (CANL) - F13-4 (CG)	Ignition switch off	200 Ω or higher
F83-3 (CANH) - F13-16 (BAT)	Ignition switch off	6 kΩ or higher
F83-14 (CANL) - F13-16 (BAT)	Ignition switch off	6 kΩ or higher

Text in Illustration

Rear view of wire harness connector

(to No. 3 Junction Connector)

Front view of DLC3

GO TO STEP 12

10.	CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - ECM)

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
F83-1 (CANH) - F83-12 (CANL)	Ignition switch off	108 to 132 Ω
F83-1 (CANH) - F13-4 (CG)	Ignition switch off	200 Ω or higher
F83-12 (CANL) - F13-4 (CG)	Ignition switch off	200 Ω or higher
F83-1 (CANH) - F13-16 (BAT)	Ignition switch off	6 kΩ or higher
F83-12 (CANL) - F13-16 (BAT)	Ignition switch off	6 kΩ or higher

Text in Illustration

Rear view of wire harness connector

(to No. 3 Junction Connector)

Front view of DLC3

GO TO STEP 14

11.	CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
F83-2 (CANH) - F83-13 (CANL)	Ignition switch off	108 to 132 Ω
F83-2 (CANH) - F13-4 (CG)	Ignition switch off	200 Ω or higher
F83-13 (CANL) - F13-4 (CG)	Ignition switch off	200 Ω or higher
F83-2 (CANH) - F13-16 (BAT)	Ignition switch off	6 kΩ or higher
F83-13 (CANL) - F13-16 (BAT)	Ignition switch off	6 kΩ or higher

Text in Illustration

Rear view of wire harness connector

(to No. 3 Junction Connector)

Front view of DLC3

REPAIR OR REPLACE NO. 3 JUNCTION CONNECTOR

GO TO STEP 16

12.	CONNECT CONNECTOR

(a) Reconnect the F83 No. 3 junction connector connector.

13.	CHECK FOR SHORT IN CAN BUS WIRES (AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the F42 air conditioning amplifier assembly connector.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
F42-11 (CANH) - F42-12 (CANL)	Ignition switch off	54 to 69 Ω
F42-11 (CANH) - F13-4 (CG)	Ignition switch off	200 Ω or higher
F42-12 (CANL) - F13-4 (CG)	Ignition switch off	200 Ω or higher
F42-11 (CANH) - F13-16 (BAT)	Ignition switch off	6 kΩ or higher
F42-12 (CANL) - F13-16 (BAT)	Ignition switch off	6 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Air Conditioning Amplifier Assembly)

Front view of DLC3

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPAIR OR REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY BRANCH WIRE OR CONNECTOR (CANH, CANL)

14.	CONNECT CONNECTOR

(a) Reconnect the F83 No. 3 junction connector connector.

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

(a) Disconnect the F50 ECM connector.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
F50-34 (CANP) - F50-33 (CANN)	Ignition switch off	108 to 132 Ω
F50-34 (CANP) - F13-4 (CG)	Ignition switch off	200 Ω or higher
F50-33 (CANN) - F13-4 (CG)	Ignition switch off	200 Ω or higher
F50-34 (CANP) - F13-16 (BAT)	Ignition switch off	6 kΩ or higher
F50-33 (CANN) - F13-16 (BAT)	Ignition switch off	6 kΩ or higher

Text in Illustration

Rear view of wire harness connector

(to ECM)

Front view of DLC3

REPLACE ECM

REPAIR OR REPLACE ECM MAIN WIRE OR CONNECTOR (CANP, CANN)

16.	CONNECT CONNECTOR

(a) Reconnect the F83 No. 3 junction connector connector.

17.	CHECK FOR SHORT IN CAN BUS WIRES (POWER MANAGEMENT CONTROL ECU)

(a) Disconnect the F80 power management control ECU connector.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
F80-12 (CA3P) - F80-11 (CA3N)	Ignition switch off	108 to 132 Ω
F80-12 (CA3P) - F13-4 (CG)	Ignition switch off	200 Ω or higher
F80-11 (CA3N) - F13-4 (CG)	Ignition switch off	200 Ω or higher
F80-12 (CA3P) - F13-16 (BAT)	Ignition switch off	6 kΩ or higher
F80-11 (CA3N) - F13-16 (BAT)	Ignition switch off	6 kΩ or higher

Text in Illustration

Rear view of wire harness connector

(to Power Management Control ECU)

Front view of DLC3

REPLACE POWER MANAGEMENT CONTROL ECU

REPAIR OR REPLACE POWER MANAGEMENT CONTROL ECU MAIN WIRE OR CONNECTOR (CA3P, CA3N)

18.	CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY AND 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 (See page ).

(b) Disconnect the F80 power management control ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F80-5 (GND2) - Body ground	Always	Below 1 Ω
F80-6 (GND) - Body ground	Always	Below 1 Ω

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
F80-1 (AM22) - Body ground	Always	11 to 14 V
F80-2 (AM21) - Body ground	Always	11 to 14 V

Text in Illustration

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

REPLACE POWER MANAGEMENT CONTROL ECU

REPAIR OR REPLACE HARNESS OR CONNECTOR

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