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:

Data List / Active Test
DATA LIST / ACTIVE TEST 1. DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals ...

Diagnosis System
DIAGNOSIS SYSTEM 1. DESCRIPTION The 4 wheel drive control ECU records DTCs when the ECU detects a malfunction in the ECU itself or in system circuits. The DTCs can be read through the DLC3 of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions ...

Disposal
DISPOSAL CAUTION / NOTICE / HINT CAUTION: Before performing pre-disposal deployment of any SRS part, review and closely follow all applicable environmental and hazardous material regulations. Predisposal deployment may be considered hazardous material treatment. PROCEDURE 1. PRECAUTION ...

© 2011-2021 Copyright www.ttguide.net