Toyota Tacoma (2015-2018) Service Manual: 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. |
|
- |
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
.gif)
) 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.
(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 | .gif) |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
.gif)
|
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.
(c) Turn the ignition switch to ON.
(d) Check for DTCs (See page ).
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:
Installation
INSTALLATION
CAUTION / NOTICE / HINT
HINT:
Use the same procedure for the RH side and LH side.
The following procedure is for the LH side.
PROCEDURE
1. INSTALL FRONT DOOR GLASS OUTER WEATHERSTRIP ASSEMBLY
(a) Engage the 5 claws to install the front door glass outer ...
On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY (for Vehicle not Involved
in Collision)
(a) Perform a diagnostic system check (See page
).
(b) With the lower No. 1 instrument panel airbag assembly ...
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
...
