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:

Inspection
INSPECTION PROCEDURE 1. INSPECT MAGNET STARTER SWITCH ASSEMBLY (a) Inspect the pull-in coil. (1) Measure the resistance according to the value(s) in the table below. Text in Illustration *a Terminal 50 *b ...

Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each sy ...

Disassembly
DISASSEMBLY PROCEDURE 1. REMOVE FRONT LOWER ARM BUSH NO. 1 (a) Using a hammer and chisel, raise the flange of the bush diagonally as shown in the illustration. (b) Using SST, remove the lower arm bush. SST: 09950-40011 09951-04010 09952-04010 09953-04020 09954-04010 ...

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