Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Tire Pressure Monitor ECU Communication Stop (C2179/79)

Toyota Tacoma 2015-2018 Service Manual / Tire And Wheel / Tire Pressure Warning System / Tire Pressure Monitor ECU Communication Stop (C2179/79)

DESCRIPTION

The main body ECU (multiplex network body ECU) sends signals to the tire pressure warning ECU and receiver via a direct line.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

C2179/79

Tire Pressure Monitor ECU Communication Stop

Communication between the main body ECU (multiplex network body ECU) and tire pressure warning ECU and receiver is interrupted for 10 seconds or more.

  • Main body ECU (Multiplex network body ECU)
  • Wire harness or connector
  • Tire pressure warning ECU and receiver

-

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the tire pressure warning ECU and receiver, read the transmitter IDs stored in the old ECU using the Techstream and write them down before removal.
  • It is necessary to perform initialization (See page ) of the transmitter IDs into the tire ) after registration (See page pressure warning ECU and receiver after the ECU has been replaced. ) of the transmitter IDs into the tire pressure warning ECU and receiver after the ECU has been replaced.
  • If the main body ECU (multiplex network body ECU) is replaced, refer to Registration (See page *: w/ Smart Key System ).*

    *: w/ Smart Key System

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECUAND RECEIVER - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the T14*1, T25*2, T24*3 tire pressure warning ECU and receiver connector.

(b) Disconnect the M6 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

T14-5 (PRG) - M6-5 (PRG)*1

T25-5 (PRG) - M6-5 (PRG)*2

T24-5 (PRG) - M6-5 (PRG)*3

Always

Below 1 Ω

T14-5 (PRG) or M6-5 (PRG) - Body ground*1

T25-5 (PRG) or M6-5 (PRG) - Body ground*2

T24-5 (PRG) or M6-5 (PRG) - Body ground*3

Always

10 kΩ or higher

  • *1: w/o Wireless Door Lock System
  • *2: w/o Smart Key System with Wireless Door Lock System
  • *3: w/ Smart Key System
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

(a) Replace the tire pressure warning ECU and receiver (See page ).

NEXT

3.

CHECK DTC OUTPUT

(a) Clear the DTCs (See page (b) Turn the ignition switch off. ).

(b) Turn the ignition switch off.

(c) Turn the ignition switch to ON.

(d) Check for DTCs (See page OK: ).

OK:

DTC C2179/79 is not output.

OK

END

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Initialization not Completed (C2177/77)
DESCRIPTION Initialization is necessary if one of the following occurs: The tire pressure warning ECU and receiver is replaced. A tire pressure warning valve and transmitter is replaced. ...

Initialization Switch (for Test Mode DTC) (C2198/98)
DESCRIPTION During test mode, when the tire pressure warning reset switch is on, the tire pressure warning light comes on and when the tire pressure warning reset switch is off, the tire pressure ...

Other materials:

On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT REAR AIRBAG SENSOR (for Vehicle not Involved in Collision) (a) Perform a diagnostic system check (See page ). 2. INSPECT REAR AIRBAG SENSOR (for Vehicle Involved in Collision and Airbag has not Deployed) (a) Perform a diagnostic system check (See p ...

Driver Side Door Entry Unlock Function does not Operate
DESCRIPTION If the entry unlock function does not operate for the driver door only, but the entry lock function operates, the request code is being transmitted properly from the driver door. In this case, there may be a problem related to the touch sensor (connection between the certification ...

Precaution
PRECAUTION 1. EXPRESSIONS OF IGNITION SWITCH HINT: The type of ignition switch used on this model differs according to the specifications of the vehicle. The expressions listed in the table below are used in this section. Expression Ignition Switch (Position) ...

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