Toyota 4Runner: Transmitter ID not Registered (C2171/71)

Toyota 4Runner Service Manual / Suspension / Tire Pressure Monitoring / Tire Pressure Warning System / Transmitter ID not Registered (C2171/71)

DESCRIPTION

The ID of each tire pressure warning valve and transmitter is registered to the tire pressure warning ECU.

When the ECU detects that a transmitter ID code is not registered in the ECU, this DTC is stored.

DTC Code	Detection Condition	Trouble Area
C2171/71	A transmitter ID code is not registered (when an ID code is unregistered for 3 minutes or more).	Tire pressure warning ECU

CAUTION / NOTICE / HINT

NOTICE:

When replacing the tire pressure warning ECU, read the IDs stored in the old ECU using the Techstream and note them down before removal.
It is necessary to perform registration of the transmitter IDs into the tire pressure warning ECU after the ECU and/or the tire pressure warning valve and transmitter has been replaced (See page ).

PROCEDURE

1.	CONFIRM REGISTRATION CONDITION (REGISTERED ID CODES)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

(f) Check the values by referring to the table below.

Tire Pressure Monitor

Tester Display	Measurement Item/Display	Normal Condition	Diagnostic Note
Registered ID1 Code	Registered ID1 code/ min.: 0 max.: FFFFFFF*1	ID No. registered for transmitter ID1 displayed	-
Registered ID2 Code	Registered ID2 code/ min.: 0 max.: FFFFFFF*1	ID No. registered for transmitter ID2 displayed	-
Registered ID3 Code	Registered ID3 code/ min.: 0 max.: FFFFFFF*1	ID No. registered for transmitter ID3 displayed	-
Registered ID4 Code	Registered ID4 code/ min.: 0 max.: FFFFFFF*1	ID No. registered for transmitter ID4 displayed	-
Registered ID5 Code*2	Registered ID5 code/ min.: 0 max.: FFFFFFF*1	ID No. registered for transmitter ID5 displayed	-

HINT:

*1: Displayed only when the ID No. is not registered.
*2: w/ Spare Tire Pressure Warning Valve and Transmitter

Result

Result	Proceed to
1 or more transmitter ID codes are not registered	A
All transmitter ID codes are registered	B

GO TO STEP 3

2.	PERFORM REGISTRATION (TRANSMITTER ID)

(a) Register the transmitter IDs for all the wheels (See page ).

3.	CONFIRM TIRE INFLATION PRESSURE (DATA LIST)

END

REPLACE TIRE PRESSURE WARNING ECU

Transmitter ID not Received in Main Mode (C2126/26)

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DESCRIPTION The tire pressure warning ECU receives an engine speed signal from the ECM. This DTC is stored upon entering test mode and cleared when an engine speed signal of 1000 rpm is detected ...

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