Toyota 4Runner manuals

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

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

DESCRIPTION

  • The main body ECU (multiplex network body ECU) stores this DTC when no signals can be received from the ECUs that are memorized as those connected to the CAN MS bus.
  • When the main body ECU (multiplex network body ECU) receives a response signal from the ECUs connected to the CAN MS bus, the main body ECU (multiplex network body ECU) recognizes and memorizes that the ECU is connected to the CAN MS bus. Based on this memorized data, the main body ECU (multiplex network body ECU) monitors for malfunctions in the ECUs connected to the CAN MS bus when communicating with those ECUs. If the main body ECU (multiplex network body ECU) cannot receive response signals from the ECUs that are memorized as those connected to the CAN MS bus, the main body ECU (multiplex network body 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.

  • MS bus circuit
  • Front power seat switch LH branch wire or connector
  • Main body ECU (multiplex network body ECU) main wire or connector
  • Combination meter assembly main wire or connector
  • Front power seat switch LH
  • Main body ECU (multiplex network body ECU)
  • Combination meter assembly
  • No. 2 junction connector

HINT:

  • For vehicles with seat position memory 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 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 (See page ).

NEXT

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

F10-9 (CANP) - F10-10 (CANN)

Ignition switch off

54 to 69 Ω

Below 54 Ω: Short in line

Higher than 69 Ω: Open in CAN main bus line

F10-9 (CANP) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

Below 6 kΩ: +B short

F10-10 (CANN) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

Below 6 kΩ: +B short

F10-9 (CANP) - F13-4 (CG)

Ignition switch off

200 Ω or higher

Below 200 Ω: Ground short

F10-10 (CANN) - F13-4 (CG)

Ignition switch off

200 Ω or higher

Below 200 Ω: Ground short

Text in Illustration

*a

Component with harness connected

(Main Body ECU (Multiplex Network Body ECU))

*b

Front view of DLC3

Result

Result

Proceed to

NG

- Open in CAN main bus line

A

NG

- Short in line

- +B short

- Ground short

B

OK

C



B

GO TO STEP 9


C

GO TO STEP 18


A

3.

CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 2 JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)

(a) Disconnect the F93 No. 2 junction connector connector.


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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

F93-2 (MSCH) - F93-13 (MSCL)

Ignition switch off

108 to 132 Ω

Text in Illustration

*a

Rear view of wire harness connector

(to No. 2 Junction Connector)


NG

GO TO STEP 5


OK

4.

CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 2 JUNCTION CONNECTOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

F93-1 (CANP) - F93-12 (CANN)

Ignition switch off

108 to 132 Ω

Text in Illustration

*a

Rear view of wire harness connector

(to No. 2 Junction Connector)



OK

REPAIR OR REPLACE NO. 2 JUNCTION CONNECTOR


NG

GO TO STEP 7

5.

CONNECT CONNECTOR

(a) Reconnect the F93 No. 2 junction connector connector.


NEXT

6.

CHECK FOR OPEN IN CAN BUS MAIN WIRE (COMBINATION METER ASSEMBLY - NO. 2 JUNCTION CONNECTOR)

(a) Disconnect the F14 combination meter assembly connector.


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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

F14-23 (MSCH) - F14-24 (MSCL)

Ignition switch off

108 to 132 Ω

Text in Illustration

*a

Front view of wire harness connector

(to Combination Meter Assembly)


OK

REPLACE COMBINATION METER ASSEMBLY


NG

REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO (COMBINATION METER ASSEMBLY - NO. 2 JUNCTION CONNECTOR)

7.

CONNECT CONNECTOR

(a) Reconnect the F93 No. 2 junction connector connector.


NEXT

8.

CHECK FOR OPEN IN CAN BUS MAIN WIRE (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - NO. 2 JUNCTION CONNECTOR)

(a) Disconnect the F10 main body ECU (multiplex network body ECU) connector.


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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

F10-9 (CANP) - F10-10 (CANN)

Ignition switch off

108 to 132 Ω

Text in Illustration

*a

Rear view of wire harness connector

(to Main Body ECU (Multiplex Network Body ECU))


OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


NG

REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - NO. 2 JUNCTION CONNECTOR)

9.

CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - FRONT POWER SEAT SWITCH LH)

(a) Disconnect the F93 No. 2 junction connector connector.


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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

F93-3 (CANP) - F93-14 (CANN)

Ignition switch off

200 Ω or higher

F93-3 (CANP) - F13-4 (CG)

Ignition switch off

200 Ω or higher

F93-14 (CANN) - F13-4 (CG)

Ignition switch off

200 Ω or higher

F93-3 (CANP) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

F93-14 (CANN) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

Text in Illustration

*a

Rear view of wire harness connector

(to No. 2 Junction Connector)

*b

Front view of DLC3


NG

GO TO STEP 12


OK

10.

CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

F93-2 (MSCH) - F93-13 (MSCL)

Ignition switch off

108 to 132 Ω

F93-2 (MSCH) - F13-4 (CG)

Ignition switch off

200 Ω or higher

F93-13 (MSCL) - F13-4 (CG)

Ignition switch off

200 Ω or higher

F93-2 (MSCH) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

F93-13 (MSCL) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

Text in Illustration

*a

Rear view of wire harness connector

(to No. 2 Junction Connector)

*b

Front view of DLC3



NG

GO TO STEP 14


OK

11.

CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

F93-1 (CANP) - F93-12 (CANN)

Ignition switch off

108 to 132 Ω

F93-1 (CANP) - F13-4 (CG)

Ignition switch off

200 Ω or higher

F93-12 (CANN) - F13-4 (CG)

Ignition switch off

200 Ω or higher

F93-1 (CANP) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

F93-12 (CANN) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

Text in Illustration

*a

Rear view of wire harness connector

(to No. 2 Junction Connector)

*b

Front view of DLC3



OK

REPAIR OR REPLACE NO. 2 JUNCTION CONNECTOR


NG

GO TO STEP 16

12.

CONNECT CONNECTOR

(a) Reconnect the F93 No. 2 junction connector connector.


NEXT

13.

CHECK FOR SHORT IN CAN BUS WIRES (FRONT POWER SEAT SWITCH LH)

(a) Disconnect the b19 front power seat switch LH connector.


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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

b19-8 (CANP) - b19-7 (CANN)

Ignition switch off

54 to 69 Ω

b19-8 (CANP) - F13-4 (CG)

Ignition switch off

200 Ω or higher

b19-7 (CANN) - F13-4 (CG)

Ignition switch off

200 Ω or higher

b19-8 (CANP) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

b19-7 (CANN) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

Text in Illustration

*a

Rear view of wire harness connector

(to Front Power Seat Switch LH)

*b

Front view of DLC3


OK

REPLACE FRONT POWER SEAT SWITCH LH


NG

REPAIR OR REPLACE FRONT POWER SEAT SWITCH LH CAN BRANCH WIRE OR CONNECTOR (CANP, CANN)

14.

CONNECT CONNECTOR

(a) Reconnect the F93 No. 2 junction connector connector.


NEXT

15.

CHECK FOR SHORT IN CAN BUS WIRES (COMBINATION METER ASSEMBLY)

(a) Disconnect the F14 combination meter assembly connector.


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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

F14-23 (MSCH) - F14-24 (MSCL)

Ignition switch off

108 to 132 Ω

F14-23 (MSCH) - F13-4 (CG)

Ignition switch off

200 Ω or higher

F14-24 (MSCL) - F13-4 (CG)

Ignition switch off

200 Ω or higher

F14-23 (MSCH) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

F14-24 (MSCL) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

Text in Illustration

*a

Front view of wire harness connector

(to Combination Meter Assembly)

*b

Front view of DLC3


OK

REPLACE COMBINATION METER ASSEMBLY


NG

REPAIR OR REPLACE COMBINATION METER ASSEMBLY CAN MAIN WIRE OR CONNECTOR (MSCH, MSCL)

16.

CONNECT CONNECTOR

(a) Reconnect the F93 No. 2 junction connector connector.


NEXT

17.

CHECK FOR SHORT IN CAN BUS WIRES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the F10 main body ECU (multiplex network body ECU) connector.


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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

F10-9 (CANP) - F10-10 (CANN)

Ignition switch off

108 to 132 Ω

F10-9 (CANP) - F13-4 (CG)

Ignition switch off

200 Ω or higher

F10-10 (CANN) - F13-4 (CG)

Ignition switch off

200 Ω or higher

F10-9 (CANP) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

F10-10 (CANN) - F13-16 (BAT)

Ignition switch off

6 kΩ or higher

Text in Illustration

*a

Rear view of wire harness connector

(to Main Body ECU (Multiplex Network Body ECU))

*b

Front view of DLC3


OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


NG

REPAIR OR REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) MAIN WIRE OR CONNECTOR (CANP, CANN)

18.

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - BATTERY AND GROUND)

(a) Remove the main body ECU (multiplex network body ECU) (See page ).


(b) Reconnect the driver side junction block assembly connectors.

(c) 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 ).


Text in Illustration

*a

Rear view of wire harness connector

(to Main Body ECU (Multiplex Network Body ECU))

*b

Front view of wire harness connector

(to Main Body ECU (Multiplex Network Body ECU))

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F10-3 (GND2) - Body ground

Always

Below 1 Ω

A-11 (GND1) - Body ground

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A-30 (BECU) - Body ground

Always

11 to 14 V

A-31 (ALTB) - Body ground

Always

11 to 14 V

A-29 (ACC) - Body ground

Ignition switch ACC

11 to 14 V

A-32 (IG) - Body ground

Ignition switch ON

11 to 14 V


OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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