TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: C2121-C2124,C2181-C2184; No Signal from Transmitter ID1; 2023 - 2024 MY RAV4 RAV4 HV [10/2022

Last Modified: 01-30-2024	6.11:8.1.0	Doc ID: RM10000000278X7
Model Year Start: 2023	Model: RAV4	Prod Date Range: [10/2022 - ]
Title: TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: C2121-C2124,C2181-C2184; No Signal from Transmitter ID1; 2023 - 2024 MY RAV4 RAV4 HV [10/2022 - ]

DTC

C2121

No Signal from Transmitter ID1

DTC

C2122

No Signal from Transmitter ID2

DTC

C2123

No Signal from Transmitter ID3

DTC

C2124

No Signal from Transmitter ID4

DTC

C2181

Transmitter ID1 not Received (Test Mode DTC)

DTC

C2182

Transmitter ID2 not Received (Test Mode DTC)

DTC

C2183

Transmitter ID3 not Received (Test Mode DTC)

DTC

C2184

Transmitter ID4 not Received (Test Mode DTC)

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 are stored.

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

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
C2121	No Signal from Transmitter ID1	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	No Signal from Transmitter ID2	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	No Signal from Transmitter ID3	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	No Signal from Transmitter ID4	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	-
C2181	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	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	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	Transmitter ID4 not Received (Test Mode DTC)	Test mode procedure is performed.	Tire pressure warning valve and transmitter Tire pressure warning ECU and receiver	-

DTC Detection Conditions: C2121

		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3
Diagnosis Condition	Tire pressure warning valve and transmitter is not in stop mode.	○	○	○
	Vehicle speed is more than 40 km/h (25 mph).	○	-	-
	No vehicle speed signal is received.	-	○	-
Malfunction Status	Any transmitter ID is not received from tire pressure warning valve and transmitters.	○	○	-
Malfunction Status	No transmitter ID is received from tire pressure warning valve and transmitters.	-	-	○
Detection Time		20 minutes or more	20 minutes or more	20 minutes or more
Number of Trips		-	-	-

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

DTC Detection Conditions: C2122

		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3
Diagnosis Condition	Tire pressure warning valve and transmitter is not in stop mode.	○	○	○
	Vehicle speed is more than 40 km/h (25 mph).	○	-	-
	No vehicle speed signal is received.	-	○	-
Malfunction Status	Any transmitter ID is not received from tire pressure warning valve and transmitters.	○	○	-
Malfunction Status	No transmitter ID is received from tire pressure warning valve and transmitters.	-	-	○
Detection Time		20 minutes or more	20 minutes or more	20 minutes or more
Number of Trips		-	-	-

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

DTC Detection Conditions: C2123

		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3
Diagnosis Condition	Tire pressure warning valve and transmitter is not in stop mode.	○	○	○
	Vehicle speed is more than 40 km/h (25 mph).	○	-	-
	No vehicle speed signal is received.	-	○	-
Malfunction Status	Any transmitter ID is not received from tire pressure warning valve and transmitters.	○	○	-
Malfunction Status	No transmitter ID is received from tire pressure warning valve and transmitters.	-	-	○
Detection Time		20 minutes or more	20 minutes or more	20 minutes or more
Number of Trips		-	-	-

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

DTC Detection Conditions: C2124

		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3
Diagnosis Condition	Tire pressure warning valve and transmitter is not in stop mode.	○	○	○
	Vehicle speed is more than 40 km/h (25 mph).	○	-	-
	No vehicle speed signal is received.	-	○	-
Malfunction Status	Any transmitter ID is not received from tire pressure warning valve and transmitters.	○	○	-
Malfunction Status	No transmitter ID is received from tire pressure warning valve and transmitters.	-	-	○
Detection Time		20 minutes or more	20 minutes or more	20 minutes or more
Number of Trips		-	-	-

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

NOTICE:

When DTCs C2121 to C2124 are set, DTC C2179 may be set simultaneously. In such cases, troubleshoot DTCs C2121 to C2124 first, then troubleshoot DTC C2179.
If the Techstream is used to display the Data List for 10 minutes or more, the tire pressure warning ECU stores DTCs C2121 to C2124. If these DTCs are stored, clear the DTCs using the Techstream.
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.

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

except 12.3 inch TFT Display Type:

for 12.3 inch TFT Display Type:

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 10

2.	CONFIRM OUTPUT DTC

(a) Check the stored DTC.

Result	Proceed to
Any DTCs from C2121 to C2124 are output (C2181 to C2184 when in Test Mode)	A
All DTCs from C2121 to C2124 are output (C2181 to C2184 when in Test Mode)	B

GO TO STEP 5

3.	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.
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.
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.
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.

HINT:

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

DTC No.	Detection Item	Data List
C2121	No Signal from Transmitter ID1	ID1 Tire Position
C2181	Transmitter ID 1 not Received (for Test Diagnosis)	ID1 Tire Position
C2122	No Signal from Transmitter ID2	ID2 Tire Position
C2182	Transmitter ID 2 not Received (for Test Diagnosis)	ID2 Tire Position
C2123	No Signal from Transmitter ID3	ID3 Tire Position
C2183	Transmitter ID 3 not Received (for Test Diagnosis)	ID3 Tire Position
C2124	No Signal from Transmitter ID4	ID4 Tire Position
C2184	Transmitter ID 4 not Received (for Test Diagnosis)	ID4 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

4.	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*	ID No. registered for transmitter ID1 displayed	-
Registered ID 2 Code	Registered ID2 code	min.: 0 max.: FFFFFFF*	ID No. registered for transmitter ID2 displayed	-
Registered ID 3 Code	Registered ID3 code	min.: 0 max.: FFFFFFF*	ID No. registered for transmitter ID3 displayed	-
Registered ID 4 Code	Registered ID4 code	min.: 0 max.: FFFFFFF*	ID No. registered for transmitter ID4 displayed	-

HINT:

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

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

DTC No.	Detection Item	Data List
C2121	No Signal from Transmitter ID1	Registered ID 1 code
C2181	Transmitter ID 1 not Received (for Test Diagnosis)	Registered ID 1 code
C2122	No Signal from Transmitter ID2	Registered ID 2 code
C2182	Transmitter ID 2 not Received (for Test Diagnosis)	Registered ID 2 code
C2123	No Signal from Transmitter ID3	Registered ID 3 code
C2183	Transmitter ID 3 not Received (for Test Diagnosis)	Registered ID 3 code
C2124	No Signal from Transmitter ID4	Registered ID 4 code
C2184	Transmitter ID 4 not Received (for Test Diagnosis)	Registered ID 4 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

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

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

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

*A	for Type C	-	-
*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 7

5.	TEST MODE INSPECTION (C2181 to C2184)

(a) Perform a test mode inspection and perform Transmitter Data Reception Check (C2181 to C2184).

Click here

END

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

6.	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*	ID No. registered for transmitter ID1 displayed	-
Registered ID 2 Code	Registered ID2 code	min.: 0 max.: FFFFFFF*	ID No. registered for transmitter ID2 displayed	-
Registered ID 3 Code	Registered ID3 code	min.: 0 max.: FFFFFFF*	ID No. registered for transmitter ID3 displayed	-
Registered ID 4 Code	Registered ID4 code	min.: 0 max.: FFFFFFF*	ID No. registered for transmitter ID4 displayed	-

HINT:

*: Displayed only when the ID No. is not registered.
The wheel position cannot be determined from ID1 through ID4 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

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

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

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

*A	for Type C	-	-
*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

7.	REGISTRATION OF TRANSMITTER ID

(a) Perform registration.

Click here

8.	PERFORM INITIALIZATION

(a) Perform initialization.

Click here

CLEAR DTC

(a) Clear the DTCs.

Chassis > Tire Pressure Monitor > Clear DTCs

END

10.

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.