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

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 ) after registration (See page ) 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

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.

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 ground1 T25-5 (PRG) or M6-5 (PRG) - Body ground2 T24-5 (PRG) or M6-5 (PRG) - Body ground*3	Always	10 kΩ or higher

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

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

3.	CHECK DTC OUTPUT

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

(b) Turn the ignition switch off.

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

OK:

DTC C2179/79 is not output.

END

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:

USB Audio System Recognition/Play Error
DESCRIPTION When a USB device or "iPod" is connected to the USB jack of the No. 1 stereo jack adapter assembly, it must have playable files. The device must also communicate with and be recognized by the radio and display receiver assembly. This diagnosis procedure is for when a dev ...

Combination Meter ECU Communication Stop Mode
DESCRIPTION Detection Item Symptom Trouble Area Combination Meter ECU Communication Stop Mode Either condition is met: Communication stop for "Combination Meter" is indicated on the "Communication Bus Ch ...

Removal
REMOVAL CAUTION / NOTICE / HINT Text in Illustration *a Object Exceeding Weight Limit of Transmission Jack Be sure to perform this procedure with several people as the rear differential carrier assembly is very heavy. Be sure to follow the procedure ...