Toyota 4Runner manuals

Toyota 4Runner: Main Body ECU Communication Stop Mode

DESCRIPTION

Detection Item

Symptom

Trouble Area

Main Body ECU Communication Stop Mode

Either condition is met:

  • "Main Body" is not displayed on the "CAN Bus Check" screen.
  • "Main Body ECU Communication Stop Mode" in "DTC Combination Table" applies.
  • Power source or inside main body ECU (multiplex network body ECU)
  • Main body ECU (multiplex network body ECU) branch wire or connector
  • Main body ECU (multiplex network body ECU)

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 ).



NEXT

2.

CHECK FOR OPEN IN CAN BUS WIRE (MAIN BODY ECU BRANCH WIRE)

(a) Disconnect the F9 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

F9-14 (CANH) - F9-13 (CANL)

Ignition switch off

54 to 69 Ω

Text in Illustration

*a

Rear view of wire harness connector

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


NG

REPAIR OR REPLACE MAIN BODY ECU BRANCH WIRE OR CONNECTOR (CANH, CANL)


OK

3.

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY AND BODY 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 ).


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])

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


(c) 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

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A-32 (IG) - Body ground

Ignition switch ON

11 to 14 V

A-31 (ALTB) - Body ground

Always

11 to 14 V

A-30 (BECU) - Body ground

Always

11 to 14 V

A-29 (ACC) - Body ground

Ignition switch ACC

11 to 14 V


OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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