Toyota CH-R Service Manual: Tire Pressure Monitor ECU Communication Stop (C2179/79)

Toyota CH-R Service Manual / Tire Pressure Monitoring / 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.
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It is necessary to perform initialization after registration of the transmitter IDs into the tire pressure warning ECU and receiver after the ECU and/or one of the valve and transmitters has been replaced.
If the main body ECU (multiplex network body ECU) is replaced, refer to Registration.*
*: w/ Smart Key System

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PROCEDURE

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

(a) Turn the ignition switch off.

(b) Disconnect the M23 tire pressure warning ECU and receiver connector.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
M23-5 (PRG) - F15-5 (PRG)	Always	Below 1 Ω
M23-5 (PRG) or F15-5 (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.

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3.	CHECK DTC OUTPUT

(a) Clear the DTCs.

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Chassis > Tire Pressure Monitor > Clear DTCs

(b) Turn the ignition switch off.

(d) Check for DTCs.

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Chassis > Tire Pressure Monitor > Trouble Codes

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. ...

Transmitter ID1 Error (C2141/41-C2145/45)

DESCRIPTION The tire pressure warning valve and transmitters that are installed in the tire and wheel assemblies measure the tire pressures. The measured values are transmitted to the tire pressu ...

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