Toyota Tacoma manuals

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

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

NG

CHECK OR REPLACE CHARGING SYSTEM OR BATTERY

OK

2.

CHECK HARNESS AND CONNECTOR (+B AND IG TERMINAL)

(a) Turn the ignition switch off.

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

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

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)

NG

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

OK

3.

CHECK HARNESS AND CONNECTOR (GND TERMINAL)

(a) Turn the ignition switch off.

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

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

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)

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

4WD ECU Malfunction (P163B)
DESCRIPTION This DTC is output when a malfunction is detected in the 4 wheel drive control ECU internal circuit. DTC No. Detection Item DTC Detection Condition ...

Lock Switch Circuit
WIRING DIAGRAM PROCEDURE 1. CHECK REAR DIFFERENTIAL LOCK INDICATOR LIGHT (a) Turn the ignition switch to ON. (b) for 4WD: Finish switching to L4. (c) Check the ...

Other materials:

Inspection
INSPECTION PROCEDURE 1. INSPECT REAR NO. 2 POWER WINDOW REGULATOR SWITCH ASSEMBLY *a Component without harness connected (Rear No. 2 Power Window Regulator Switch Assembly) *b Pull (Close) *c Push (Open) ...

Disassembly
DISASSEMBLY PROCEDURE 1. REMOVE PRESSURE RELIEF VALVE (a) Remove the pressure relief valve and O-ring. 2. REMOVE MAGNET CLUTCH ASSEMBLY (a) Secure the cooler compressor assembly in a vise between aluminum plates. (b) Using SST, hold the magnet clutch hub. SST: 09985-00260 (c) Remove the ...

Transfer Shift Motor Limit Switch Circuit (P17AC)
DESCRIPTION When the transfer switches modes, the TL1, TL2 and TL3 terminals of the limit switch are in one of the ON/OFF combinations listed in the table below. Terminal When 2WD Switching between 2WD and H4 When H4 Switching between H4 and ...

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