TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: C2121-C2125,C2181-C2185; Transmitter ID 1 not Received (Main); 2023 - 2024 MY Camry [08/2022

Last Modified: 11-20-2023	6.11:8.1.0	Doc ID: RM1000000025DJ5
Model Year Start: 2023	Model: Camry	Prod Date Range: [08/2022 - ]
Title: TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: C2121-C2125,C2181-C2185; Transmitter ID 1 not Received (Main); 2023 - 2024 MY Camry [08/2022 - ]

DTC

C2121

Transmitter ID 1 not Received (Main)

DTC

C2122

Transmitter ID 2 not Received (Main)

DTC

C2123

Transmitter ID 3 not Received (Main)

DTC

C2124

Transmitter ID 4 not Received (Main)

DTC

C2125

Transmitter ID 5 not Received (Main)

DTC

C2181

Transmitter ID 1 not Received (for Test Diagnosis)

DTC

C2182

Transmitter ID 2 not Received (for Test Diagnosis)

DTC

C2183

Transmitter ID 3 not Received (for Test Diagnosis)

DTC

C2184

Transmitter ID 4 not Received (for Test Diagnosis)

DTC

C2185

Transmitter ID 5 not Received (for Test Diagnosis)

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 40 km/h (25 mph), or no transmitter ID is received from all of the tire pressure warning valve and transmitters for 20 minutes or more, DTCs from C2121 to C2124 (C2125: w/ Full Size Spare Tire) are stored.

DTCs C2121 to C2124 (C2125: w/ Full Size Spare Tire) can only be cleared by using the Techstream. DTCs C2181 to C2184 (C2185: w/ Full Size Spare Tire) can be cleared when the tire pressure warning valve and transmitter sends a forced transmission signal or test mode ends. DTCs C2181 to C2184 (C2185: w/ Full Size Spare Tire) are output only in test mode.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
C2121	Transmitter ID 1 not Received (Main)	Either of the following conditions (a) or (b) is met: (a) 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 40 km/h (25 mph) or no vehicle speed signal is received for 20 minutes or more. (b) When both conditions below are met: Tire pressure warning valve and transmitter is not in stop mode. No transmitter ID is received from tire pressure warning valve and transmitters for 20 minutes or more.	Tire pressure warning valve and transmitter Tire pressure warning ECU and receiver	-
C2122	Transmitter ID 2 not Received (Main)	Either of the following conditions (a) or (b) is met: (a) 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 40 km/h (25 mph) or no vehicle speed signal is received for 20 minutes or more. (b) When both conditions below are met: Tire pressure warning valve and transmitter is not in stop mode. No transmitter ID is received from tire pressure warning valve and transmitters for 20 minutes or more.	Tire pressure warning valve and transmitter Tire pressure warning ECU and receiver	-
C2123	Transmitter ID 3 not Received (Main)	Either of the following conditions (a) or (b) is met: (a) 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 40 km/h (25 mph) or no vehicle speed signal is received for 20 minutes or more. (b) When both conditions below are met: Tire pressure warning valve and transmitter is not in stop mode. No transmitter ID is received from tire pressure warning valve and transmitters for 20 minutes or more.	Tire pressure warning valve and transmitter Tire pressure warning ECU and receiver	-
C2124	Transmitter ID 4 not Received (Main)	Either of the following conditions (a) or (b) is met: (a) 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 40 km/h (25 mph) or no vehicle speed signal is received for 20 minutes or more. (b) When both conditions below are met: Tire pressure warning valve and transmitter is not in stop mode. No transmitter ID is received from tire pressure warning valve and transmitters for 20 minutes or more.	Tire pressure warning valve and transmitter Tire pressure warning ECU and receiver	-
C2125	Transmitter ID 5 not Received (Main)	Either of the following conditions (a) or (b) is met: (a) 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 40 km/h (25 mph) or no vehicle speed signal is received for 20 minutes or more. (b) When both conditions below are met: Tire pressure warning valve and transmitter is not in stop mode. No transmitter ID is received from tire pressure warning valve and transmitters for 20 minutes or more.	Tire pressure warning valve and transmitter Tire pressure warning ECU and receiver	w/ Full Size Spare Tire
C2181	Transmitter ID 1 not Received (for Test Diagnosis)	Test mode procedure is performed.	Tire pressure warning valve and transmitter Tire pressure warning ECU and receiver	-
C2182	Transmitter ID 2 not Received (for Test Diagnosis)	Test mode procedure is performed.	Tire pressure warning valve and transmitter Tire pressure warning ECU and receiver	-
C2183	Transmitter ID 3 not Received (for Test Diagnosis)	Test mode procedure is performed.	Tire pressure warning valve and transmitter Tire pressure warning ECU and receiver	-
C2184	Transmitter ID 4 not Received (for Test Diagnosis)	Test mode procedure is performed.	Tire pressure warning valve and transmitter Tire pressure warning ECU and receiver	-
C2185	Transmitter ID 5 not Received (for Test Diagnosis)	Test mode procedure is performed.	Tire pressure warning valve and transmitter Tire pressure warning ECU and receiver	w/ Full Size Spare Tire

NOTICE:

w/ ID Switching Function:
(Main) is displayed on the DTC screen for the DTCs even when the 2nd set of tires is selected.
When DTCs C2121 to C2124 (C2125: w/ Full Size Spare Tire) are set, DTC C2179 may be set simultaneously. In such cases, troubleshoot DTCs C2121 to C2124 (C2125: w/ Full Size Spare Tire) first, then troubleshoot DTC C2179.
w/o Full Size Spare Tire:
If any DTC from C2121 to C2124 is output, clear the DTCs or drive the vehicle at 40 km/h (25 mph) for 1 minute or more after repairing the malfunctions.
w/ Full Size Spare Tire:
If any DTC from C2121 to C2125 is output, clear the DTCs after repairing the malfunctions.

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 or tire pressure warning valve and transmitter, read the transmitter IDs and number of the transmitters (4 or 5) 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 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.

HINT:

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

Result	Proceed to
There is no device or facility that uses electrical waves of approximately the same frequency in the vicinity of the vehicle or inside the vehicle.	A
There is a device or facility that uses electrical waves of approximately the same frequency in the vicinity of the vehicle or inside the vehicle.	B

GO TO STEP 12

2.	CONFIRM OUTPUT DTC

(a) Check the stored DTC.

Result	Proceed to
Any DTCs from C2121 to C2124 (C2125: w/ Full Size Spare Tire) are output (C2181 to C2184 (C2185: w/ Full Size Spare Tire) when in Test Mode)	A
All DTCs from C2121 to C2124 (C2125: w/ Full Size Spare Tire) are output (C2181 to C2184 (C2185: w/ Full Size Spare Tire) when in Test Mode)	B

GO TO STEP 7

3.	CONFIRM MODEL

(a) Choose the model to be inspected.

Result	Proceed to
w/ Tire Inflation Pressure Display Function	A
w/o Tire Inflation Pressure Display Function	B

GO TO STEP 5

4.	IDENTIFY TRANSMITTER CORRESPONDING TO DTC (TIRE POSITION)

(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) Display the "ID Tire Position" value for each wheel using the Techstream.

(g) Refer to the following chart and check the wheel position of the DTC and transmitter match.

Chassis > Tire Pressure Monitor > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
ID 1 Tire Position	ID1 Tire Position	No Information or FL or FR or RL or RR or Spare or Judging	ID1 tire position is displayed	If no tire position information is stored, "No Information" will be displayed. w/ Tire Inflation Pressure Display Function
ID 2 Tire Position	ID2 Tire Position	No Information or FL or FR or RL or RR or Spare or Judging	ID2 tire position is displayed	If no tire position information is stored, "No Information" will be displayed. w/ Tire Inflation Pressure Display Function
ID 3 Tire Position	ID3 Tire Position	No Information or FL or FR or RL or RR or Spare or Judging	ID3 tire position is displayed	If no tire position information is stored, "No Information" will be displayed. w/ Tire Inflation Pressure Display Function
ID 4 Tire Position	ID4 Tire Position	No Information or FL or FR or RL or RR or Spare or Judging	ID4 tire position is displayed	If no tire position information is stored, "No Information" will be displayed. w/ Tire Inflation Pressure Display Function
ID 5 Tire Position	ID5 Tire Position	No Information or FL or FR or RL or RR or Spare or Judging	ID5 tire position is displayed	If no tire position information is stored, "No Information" will be displayed. w/ Tire Inflation Pressure Display Function *1

HINT:

*1: w/ Full Size Spare Tire

Refer to the following chart for the Data List items that correspond to the DTCs.

DTC No.	Detection Item	Data List
*1: w/ Full Size Spare Tire
C2121	Transmitter ID 1 not Received (Main)	ID1 Tire Position
C2181	Transmitter ID 1 not Received (for Test Diagnosis)	ID1 Tire Position
C2122	Transmitter ID 2 not Received (Main)	ID2 Tire Position
C2182	Transmitter ID 2 not Received (for Test Diagnosis)	ID2 Tire Position
C2123	Transmitter ID 3 not Received (Main)	ID3 Tire Position
C2183	Transmitter ID 3 not Received (for Test Diagnosis)	ID3 Tire Position
C2124	Transmitter ID 4 not Received (Main)	ID4 Tire Position
C2184	Transmitter ID 4 not Received (for Test Diagnosis)	ID4 Tire Position
C2125*1	Transmitter ID 5 not Received (Main)	ID5 Tire Position
C2185*1	Transmitter ID 5 not Received (for Test Diagnosis)	ID5 Tire Position

Chassis > Tire Pressure Monitor > Data List

Tester Display
ID 1 Tire Position
ID 2 Tire Position
ID 3 Tire Position
ID 4 Tire Position
ID 5 Tire Position

GO TO STEP 6

5.	IDENTIFY TRANSMITTER CORRESPONDING TO DTC (TIRE POSITION)

(a) Set the tire pressure to the specified value.

Click here

(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.

Chassis > Tire Pressure Monitor > Data List

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
ID 5 Tire Inflation Pressure	ID5 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 2

HINT:

*1: It may take a few minutes until the values are displayed.
*2: w/ Full Size Spare Tire

Chassis > Tire Pressure Monitor > Data List

Tester Display
ID 1 Tire Inflation Pressure
ID 2 Tire Inflation Pressure
ID 3 Tire Inflation Pressure
ID 4 Tire Inflation Pressure
ID 5 Tire Inflation Pressure

(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.

(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.

6.	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) Refer to the following chart and record the tire pressure warning valve and transmitter ID of the output DTC.

Chassis > Tire Pressure Monitor > Data List

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	-
Registered ID 5 Code	Registered ID5 code	min.: 0 max.: FFFFFFF*1	ID No. registered for transmitter ID5 displayed	*2

HINT:

*1: Displayed only when the ID No. is not registered.
*2: w/ Full Size Spare Tire

Refer to the following chart for the Data List items that correspond to the DTCs.

DTC No.	Detection Item	Data List
*2: w/ Full Size Spare Tire
C2121	Transmitter ID 1 not Received (Main)	Registered ID 1 code
C2181	Transmitter ID 1 not Received (for Test Diagnosis)	Registered ID 1 code
C2122	Transmitter ID 2 not Received (Main)	Registered ID 2 code
C2182	Transmitter ID 2 not Received (for Test Diagnosis)	Registered ID 2 code
C2123	Transmitter ID 3 not Received (Main)	Registered ID 3 code
C2183	Transmitter ID 3 not Received (for Test Diagnosis)	Registered ID 3 code
C2124	Transmitter ID 4 not Received (Main)	Registered ID 4 code
C2184	Transmitter ID 4 not Received (for Test Diagnosis)	Registered ID 4 code
C2125*2	Transmitter ID 5 not Received (Main)	Registered ID 5 code
C2185*2	Transmitter ID 5 not Received (for Test Diagnosis)	Registered ID 5 code

Chassis > Tire Pressure Monitor > Data List

Tester Display
Registered ID 1 Code
Registered ID 2 Code
Registered ID 3 Code
Registered ID 4 Code
Registered ID 5 Code

(g) Disassemble the tire indicated in the output DTC and check the tire pressure warning valve and transmitter ID.

*A	for Type A	*B	for Type B
*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	Proceed to
Match	A
Do not match	B

REPLACE CORRESPONDING TIRE PRESSURE WARNING VALVE AND TRANSMITTER

GO TO STEP 9

7.	TEST MODE INSPECTION (C2181 to C2184 (C2185: w/ Full Size Spare Tire))

(a) Perform a test mode inspection and perform Transmitter Data Reception Check (C2181 to C2184 (C2185: w/ Full Size Spare Tire)).

Click here

END

Explain to the customer that there is a high possibility that a DTC was output due to temporary electrical wave interference.

8.	CHECK TIRE PRESSURE WARNING VALVE AND TRANSMITTER

(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) Refer to the following chart and record all of the tire pressure warning valve and transmitter IDs.

Chassis > Tire Pressure Monitor > Data List

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	-
Registered ID 5 Code	Registered ID5 code	min.: 0 max.: FFFFFFF*1	ID No. registered for transmitter ID5 displayed	*2

HINT:

*1: Displayed only when the ID No. is not registered.
*2: w/ Full Size Spare Tire
The wheel position cannot be determined from ID1 through ID5 on the Data List.

Chassis > Tire Pressure Monitor > Data List

Tester Display
Registered ID 1 Code
Registered ID 2 Code
Registered ID 3 Code
Registered ID 4 Code
Registered ID 5 Code

(g) Disassemble all of the tires and check the tire pressure warning valve and transmitter IDs.

*A	for Type A	*B	for Type B
*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	Proceed to
Match	A
Do not match	B

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

9.	REGISTRATION OF TRANSMITTER ID

(a) Perform registration.

Click here

10.	PERFORM INITIALIZATION

(a) Perform initialization.

Click here

11.

CLEAR DTC

(a) Clear the DTCs.

Chassis > Tire Pressure Monitor > Clear DTCs

END

12.

CLEAR DTC

(a) Clear the DTCs.

Chassis > Tire Pressure Monitor > Clear DTCs

END

Explain to the customer that there is a high possibility that a device (located near or inside the vehicle) or facility using electrical waves of approximately the same frequency is causing electrical wave interference.