Toyota Tacoma 2015-2018 Service Manual: ECU Power Source Circuit

Toyota Tacoma 2015-2018 Service Manual / Differential / Differential System(w/ Rear Differential Lock) / ECU Power Source Circuit

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.	INSPECT BATTERY

(a) Check the battery voltage.

Standard voltage:

11 to 14 V

CHECK OR REPLACE CHARGING SYSTEM OR BATTERY

2.	CHECK HARNESS AND CONNECTOR (+B AND IG TERMINAL)

(a) Turn the ignition switch off.

(b) Disconnect the 4 wheel drive control ECU connector.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
F13-21 (+B) - Body ground	Always	11 to 14 V
F12-4 (IG) - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

*a	Front view of wire harness connector (to 4 Wheel Drive Control ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR (+B OR IG CIRCUIT)

3.	CHECK HARNESS AND CONNECTOR (GND TERMINAL)

(a) Turn the ignition switch off.

(b) Disconnect the 4 wheel drive control ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F12-10 (GND) - Body ground	Always	Below 1 Ω

Text in Illustration

*a	Front view of wire harness connector (to 4 Wheel Drive Control ECU)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

4WD ECU Malfunction (P163B)

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