Toyota Tacoma (2015-2018) Service Manual: No Signal from Transmitter ID1 (C2121/21-C2124/24,C2181/81-C2184/84)

Toyota Tacoma (2015-2018) Service Manual / Tire And Wheel / Tire Pressure Warning System / No Signal from Transmitter ID1 (C2121/21-C2124/24,C2181/81-C2184/84)

DESCRIPTION

The tire pressure warning valve and transmitters that are installed in the tire and wheel assemblies measure the tire pressure of each wheel. The measured values are transmitted to the tire pressure warning ECU and receiver in the vehicle as radio waves. The ECU compares the measured tire pressure values with the tire pressure threshold. When the measured tire pressure value is less than this threshold, the warning light in the combination meter assembly illuminates.

The tire pressure warning valve and transmitters constantly send radio waves to the tire pressure warning ECU and receiver.

Under the conditions below, the tire pressure warning ECU and receiver is unable to receive the signals from the tire pressure warning valve and transmitters, and a DTC is stored.

Facilities or devices that use similar radio frequencies are located in the vicinity of the vehicle.
Devices using similar radio frequencies are used in the vehicle.
The ID of a tire pressure warning valve and transmitter is mistyped during registration.
A tire, wheel and/or transmitter from a different vehicle is installed.

HINT:

When no transmitter ID is received from a tire pressure warning valve and transmitter for 20 minutes or more while the vehicle speed is more than 37 km/h (23 mph), a DTC from C2121/21 to C2124/24 is stored.

DTCs C2121/21 to C2124/24 can only be cleared by using the Techstream. DTCs C2181/81 to C2184/84 can be cleared when the tire pressure warning valve and transmitter sends a forced transmission signal or test mode ends. DTCs C2181/81 to C2184/84 are output only in test mode.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
C2121/21	No Signal from Transmitter ID1	When all conditions below are met: Tire pressure warning valve and transmitter is not in stop mode. Any transmitter ID is not received from tire pressure warning valve and transmitters. Vehicle speed is more than 37 km/h (23 mph) or no vehicle speed signal is received for 20 minutes or more.	Tire pressure warning valve and transmitter Tire pressure warning ECU and receiver	-
C2122/22	No Signal from Transmitter ID2	When all conditions below are met: Tire pressure warning valve and transmitter is not in stop mode. Any transmitter ID is not received from tire pressure warning valve and transmitters. Vehicle speed is more than 37 km/h (23 mph) or no vehicle speed signal is received for 20 minutes or more.	Tire pressure warning valve and transmitter Tire pressure warning ECU and receiver	-
C2123/23	No Signal from Transmitter ID3	When all conditions below are met: Tire pressure warning valve and transmitter is not in stop mode. Any transmitter ID is not received from tire pressure warning valve and transmitters. Vehicle speed is more than 37 km/h (23 mph) or no vehicle speed signal is received for 20 minutes or more.	Tire pressure warning valve and transmitter Tire pressure warning ECU and receiver	-
C2124/24	No Signal from Transmitter ID4	When all conditions below are met: Tire pressure warning valve and transmitter is not in stop mode. Any transmitter ID is not received from tire pressure warning valve and transmitters. Vehicle speed is more than 37 km/h (23 mph) or no vehicle speed signal is received for 20 minutes or more.	Tire pressure warning valve and transmitter Tire pressure warning ECU and receiver	-
C2181/81	Transmitter ID1 not Received (Test Mode DTC)	Test mode procedure is performed.	Tire pressure warning valve and transmitter Tire pressure warning ECU and receiver	-
C2182/82	Transmitter ID2 not Received (Test Mode DTC)	Test mode procedure is performed.	Tire pressure warning valve and transmitter Tire pressure warning ECU and receiver	-
C2183/83	Transmitter ID3 not Received (Test Mode DTC)	Test mode procedure is performed.	Tire pressure warning valve and transmitter Tire pressure warning ECU and receiver	-
C2184/84	Transmitter ID4 not Received (Test Mode DTC)	Test mode procedure is performed.	Tire pressure warning valve and transmitter Tire pressure warning ECU and receiver	-

NOTICE:

When DTCs C2121/21 to C2124/24 are stored, DTC C2179/79 may be stored simultaneously. In such cases, troubleshoot DTCs C2121/21 to C2124/24 first, then troubleshoot DTC C2179/79.

HINT:

It is necessary to perform the following procedure to identify the tire pressure warning valve and transmitter that is malfunctioning because it cannot be identified by the output DTC.

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 ) after registration (See page ) of the transmitter IDs into the tire pressure warning ECU and receiver if the ECU and/or one of the valve and transmitters has been replaced.

PROCEDURE

1.	CHECK FREQUENCY RECEIVING CONDITION

(a) Check that the following conditions are not met:

(1) Facilities or devices that use similar radio frequencies are located in the vicinity of the vehicle.

HINT:

If the vehicle is located in an area such as the one described above, the tire pressure warning light may illuminate after blinking for 1 minute due to interfering radio frequencies.

(2) Devices using similar radio frequencies are used in the vehicle.

OK:

Facilities or devices that use similar radio frequencies are not located in the vicinity of the vehicle.

HINT:

Radio wave transmissions may be interrupted due to the surroundings or devices installed by the user.

CHECK IF ANY DEVICE IS INSTALLED BY USER

2.	IDENTIFY TRANSMITTER CORRESPONDING TO DTC

(a) Set the tire pressure to the specified value (See page (b) Turn the ignition switch off. ).

(b) Turn the ignition switch off.

(d) Turn the ignition switch to ON.

(e) Turn the Techstream on.

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

(g) Display the "ID Tire Inflation Pressure" value for each wheel using the Techstream.

(h) Rapidly reduce the tire pressure for each wheel at least 40 kPa (0.4 kg/cm2, 5.8 psi) within 30 seconds. If the "ID Tire Inflation Pressure" value displayed on the Techstream does not change, the tire pressure warning valve and transmitter corresponding to the unchanged "ID Tire Inflation Pressure" value was the cause of the output DTC.

HINT:

Identify the malfunctioning tire pressure warning valve and transmitter by repeatedly decreasing the tire pressure for each tire.
Record which "ID Tire Inflation Pressure" value corresponds to each tire.

Tire Pressure Monitor

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
ID 1 Tire Inflation Pressure	ID1 tire inflation pressure/ min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (Gauge) / 0 kPa (0 kgf/cm2, 0 psi) max.: Absolute pressure (abs) / 480 kPa (4.9 kgf/cm2, 70 psi), Relative pressure (Gauge) / 380 kPa (3.9 kgf/ cm2, 55 psi)	Actual tire inflation pressure	If N/A is displayed, data has not been received.*1
ID 2 Tire Inflation Pressure	ID2 tire inflation pressure/ min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (Gauge) / 0 kPa (0 kgf/cm2, 0 psi) max.: Absolute pressure (abs) / 480 kPa (4.9 kgf/cm2, 70 psi), Relative pressure (Gauge) / 380 kPa (3.9 kgf/ cm2, 55 psi)	Actual tire inflation pressure	If N/A is displayed, data has not been received.*1
ID 3 Tire Inflation Pressure	ID3 tire inflation pressure/ min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (Gauge)/ 0 kPa (0 kgf/cm2, 0 psi) max.: Absolute pressure (abs) / 480 kPa (4.9 kgf/cm2, 70 psi), Relative pressure (Gauge) / 380 kPa (3.9 kgf/ cm2, 55 psi)	Actual tire inflation pressure	If N/A is displayed, data has not been received.*1
ID 4 Tire Inflation Pressure	ID4 tire inflation pressure/ min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (Gauge) / 0 kPa (0 kgf/cm2, 0 psi) max.: Absolute pressure (abs) / 480 kPa (4.9 kgf/cm2, 70 psi), Relative pressure (Gauge) / 380 kPa (3.9 kgf/ cm2, 55 psi)	Actual tire inflation pressure	If N/A is displayed, data has not been received.*1

HINT:

*1: It may take a few minutes until the values are displayed.

(i) Check the Data List.

NOTICE:

It may take a few minutes until the values are displayed.
When an "ID Tire Inflation Pressure" value has not changed, reset the tire pressure to the appropriate specified value and rotate the tire 90 to 270 degrees. Then rapidly release the tire pressure and recheck the value.
Record the transmitter IDs and positions of transmitters that are normal.

(j) After confirming that the "ID Tire Inflation Pressure" value for one tire has changed, repeat this procedure one by one. Identify the transmitter that corresponds to the DTC.

Result

Result	Proceed to
One or more transmitter is abnormal.	A
All transmitters are normal.	B

END

3.	CHECK TRANSMITTER ID

(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/Range	Normal Condition	Diagnostic Note
Registered ID 1 Code	Registered ID1 code/ min.: 0 max.: FFFFFFF*1	ID No. registered for transmitter ID1 displayed	-
Registered ID 2 Code	Registered ID2 code/ min.: 0 max.: FFFFFFF*1	ID No. registered for transmitter ID2 displayed	-
Registered ID 3 Code	Registered ID3 code/ min.: 0 max.: FFFFFFF*1	ID No. registered for transmitter ID3 displayed	-
Registered ID 4 Code	Registered ID4 code/ min.: 0 max.: FFFFFFF*1	ID No. registered for transmitter ID4 displayed	-

HINT:

*1: Displayed only when the ID No. is not registered.

(g) Check the ID number on the identified transmitter by removing it from the tire and wheel.

Text in Illustration

*1	Tire Pressure Warning Valve and Transmitter	-	-
*a	Transmitter ID (7-digit Number)	-	-

(h) Confirm that the ID number on the transmitter and recorded transmitter ID match.

Result

Result	Proceed to
Match	A
Do not match	B

GO TO STEP 5

4.	REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER

(a) Replace the tire pressure warning valve and transmitter (See page ).

5.	REGISTRATION OF TRANSMITTER ID

(a) Perform registration (See page ).

6.	PERFORM INITIALIZATION

(a) Perform initialization (See page ).

7.	CONFIRM TIRE INFLATION PRESSURE (DATA LIST)

(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/Range	Normal Condition	Diagnostic Note
ID 1 Tire Inflation Pressure	ID1 tire inflation pressure/ min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (Gauge) / 0 kPa (0 kgf/cm2, 0 psi) max.: Absolute pressure (abs) / 480 kPa (4.9 kgf/cm2, 70 psi), Relative pressure (Gauge) / 380 kPa (3.9 kgf/ cm2, 55 psi)	Actual tire inflation pressure	If N/A is displayed, data has not been received.*1
ID 2 Tire Inflation Pressure	ID2 tire inflation pressure/ min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (Gauge) / 0 kPa (0 kgf/cm2, 0 psi) max.: Absolute pressure (abs) / 480 kPa (4.9 kgf/cm2, 70 psi), Relative pressure (Gauge) / 380 kPa (3.9 kgf/ cm2, 55 psi)	Actual tire inflation pressure	If N/A is displayed, data has not been received.*1
ID 3 Tire Inflation Pressure	ID3 tire inflation pressure/ min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (Gauge) / 0 kPa (0 kgf/cm2, 0 psi) max.: Absolute pressure (abs) / 480 kPa (4.9 kgf/cm2, 70 psi), Relative pressure (Gauge) / 380 kPa (3.9 kgf/ cm2, 55 psi)	Actual tire inflation pressure	If N/A is displayed, data has not been received.*1
ID 4 Tire Inflation Pressure	ID4 tire inflation pressure/ min.: Absolute pressure (abs) / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure (Gauge) / 0 kPa (0 kgf/cm2, 0 psi) max.: Absolute pressure (abs) / 480 kPa (4.9 kgf/cm2, 70 psi), Relative pressure (Gauge) / 380 kPa (3.9 kgf/ cm2, 55 psi)	Actual tire inflation pressure	If N/A is displayed, data has not been received.*1

HINT:

*1: It may take a few minutes until the values are displayed.
When an "ID Tire Inflation Pressure" value has not changed, reset the tire pressure to the appropriate specified value and rotate the tire 90 to 270 degrees. Then rapidly release the tire pressure and recheck the value.

Result

Result	Proceed to
Tire pressure values are not displayed.	A
All tire pressure readings are equal to specified values.	B

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

END

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