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:
Child restraint systems
A child restraint system for a small child or baby must itself be properly
restrained on the seat with the lap portion of the lap/shoulder belt.
The laws of all 50 states of the U.S.A. and Canada now require the use of child
restraint systems.
Points to remember
Studies have shown that instal ...
Precaution
PRECAUTION
IGNITION SWITCH EXPRESSIONS
(a) 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)
Engine Swi ...
Starter Relay Circuit Short to Battery (P061512)
DESCRIPTION
While the engine is being cranked, positive battery voltage is applied to terminal
STA of the ECM. If the ECM detects the starter control (STA) signal while the vehicle
is being driven, it determines that there is a malfunction in the STA circuit. The
ECM then illuminates the MIL ...