Toyota Tundra 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.	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 after registration of the transmitter IDs into the tire pressure warning ECU and receiver after the ECU has been replaced.

PROCEDURE

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

(a) Disconnect the P21 tire pressure warning ECU and receiver connector.

(b) Disconnect the J165 main body ECU (multiplex network body ECU) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
P21-5 (PRG) - J165-5 (PRG)	Always	Below 1 Ω
P21-5 (PRG) or J165-5 (PRG) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

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

Click here

3.	CHECK DTC OUTPUT

(a) Clear the DTCs.

Click here

(b) Turn the ignition switch off.

(d) Check for DTCs.

Click here

OK:

DTC C2179/79 is not output.

END

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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Toyota Tundra Owners Manual