Toyota 4Runner: Power Management Control ECU Communication Stop Mode

Toyota 4Runner Service Manual / Power Source / Network / Networking / Can Communication System / Power Management Control ECU Communication Stop Mode

DESCRIPTION

Detection Item	Symptom	Trouble Area
Power Management Control ECU Communication Stop Mode	Either condition is met: "Power Management1" is not displayed on the "CAN Bus Check" screen. "Power Management Control ECU Communication Stop Mode" in "DTC Combination Table" applies.	Power source or inside power management control ECU Power management control ECU branch wire or connector Power management control ECU

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 OPEN IN CAN BUS WIRE (POWER MANAGEMENT CONTROL ECU BRANCH WIRE)

(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
F80-14 (CA1H) - F80-13 (CA1L)	Ignition switch off	54 to 69 Ω

Text in Illustration

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

REPAIR OR REPLACE POWER MANAGEMENT CONTROL ECU BRANCH WIRE OR CONNECTOR (CA1H, CA1L)

3.	CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL 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 ).

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

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

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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