Toyota Tacoma (2015-2018) Service Manual: 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
| NG | .gif) |
CHECK OR REPLACE CHARGING SYSTEM OR BATTERY |
|
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|
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 |
|
*a |
Front view of wire harness connector (to 4 Wheel Drive Control ECU) |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR (+B AND IG CIRCUIT) |
|
|
3. |
CHECK HARNESS AND CONNECTOR (GND TERMINAL) |
(a) Turn the ignition switch off.
|
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
| OK | |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT) |
4WD Control Switch Circuit
WIRING DIAGRAM
PROCEDURE
1.
CONFIRM PROBLEM SYMPTOM
(a) Confirm the problem symptoms.
Result
Result
Proceed to
The 4WD ind ...
Other materials:
Diagnosis System
DIAGNOSIS SYSTEM
1. CHECK DLC3
(a) The vehicle ECUs use ISO 15765-4 communication protocol. The terminal arrangement
of the DLC3 complies with ISO 15031-3 and matches the ISO 15765-4 format.
Terminals No. (Symbols)
Terminal Description
Condition
Spe ...
System Diagram
SYSTEM DIAGRAM
Communication Table
Sender
Receiver
Signal
Communication Method
Power window regulator master switch assembly*1
Main Body ECU (Multiplex Network Body ECU)
Door control switch signal
...
Open in Stop Light Switch Circuit (C1425)
DESCRIPTION
The skid control ECU (master cylinder solenoid) inputs stop light switch signals
and the brake operation condition.
The skid control ECU (master cylinder solenoid) has an open detection circuit,
which outputs this DTC when detecting an open circuit in the stop light input line
or ...
