Toyota 4Runner: No Signal from Transmitter ID1 in Main Mode (C2121/21-C2125/25,C2181/81-C2185/85)

Toyota 4Runner Service Manual / Suspension / Tire Pressure Monitoring / Tire Pressure Warning System / No Signal from Transmitter ID1 in Main Mode (C2121/21-C2125/25,C2181/81-C2185/85)

DESCRIPTION

The tire pressure warning valve and transmitters that are installed in the tire and wheel assemblies measure the tire pressure of the tires. The measured values are transmitted to the tire pressure warning antenna and receiver on the body as radio waves and then sent to the tire pressure warning ECU. 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 turns on.

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

Under the conditions below, the tire pressure warning antenna and receiver is unable to receive the signals from the tire pressure warning valves 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/transmitter from a different vehicle is installed.

HINT:

These DTCs are stored when no signals are received for 20 minutes or more and a vehicle speed of 8 km/h (5 mph) or more is detected for a total of 20 minutes.

DTCs C2121/21 to C2124/24 or C2125/25* can only be cleared by using the Techstream. DTCs C2181/81 to C2184/84 or C2185/85* can be cleared when the transmitter in the tire pressure warning valve and transmitter sends a forced transmission signal or test mode ends. DTCs C2181/81 to C2184/84 or C2185/85* are output only in test mode.

*: w/ Spare Tire Pressure Warning Valve and Transmitter

DTC Code	DTC Detection Condition	Trouble Area
C2121/21 C2122/22 C2123/23 C2124/24 C2125/25*	All conditions are met: The tire pressure warning valve and transmitter is not in stop mode. A signal is not received from the tire pressure warning valve and transmitter for 20 minutes or more. The vehicle speed is more than 8 km/h (5 mph) for a total of 20 minutes.	Tire pressure warning valve and transmitter Tire pressure warning antenna and receiver Harness or connector Tire pressure warning ECU
C2181/81 C2182/82 C2183/83 C2184/84 C2185/85*	The test mode procedure is performed.	Tire pressure warning valve and transmitter Tire pressure warning antenna and receiver Harness or connector Tire pressure warning ECU

DTC Code

DTC Detection Condition

Trouble Area

C2121/21

C2122/22

C2123/23

C2124/24

C2125/25*

All conditions are met:

The tire pressure warning valve and transmitter is not in stop mode.
A signal is not received from the tire pressure warning valve and transmitter for 20 minutes or more.
The vehicle speed is more than 8 km/h (5 mph) for a total of 20 minutes.

Tire pressure warning valve and transmitter
Tire pressure warning antenna and receiver
Harness or connector
Tire pressure warning ECU

C2181/81

C2182/82

C2183/83

C2184/84

C2185/85*

The test mode procedure is performed.

Tire pressure warning valve and transmitter
Tire pressure warning antenna and receiver
Harness or connector
Tire pressure warning ECU

*: w/ Spare Tire Pressure Warning Valve and Transmitter

HINT:

It is necessary to perform this procedure in order to identify the tire pressure warning valve and transmitter because it cannot be identified by the output DTCs.

WIRING DIAGRAM

Refer to DTCs C2111/11 to C2114/14 or C2115/15* (See page ).

*: w/ Spare Tire Pressure Warning Valve and Transmitter

CAUTION / NOTICE / HINT

NOTICE:

When replacing the tire pressure warning ECU, read the IDs stored in the old ECU using the Techstream and write 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.	READ OUTPUT DTC (DTC C2173/73)

(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 / Trouble Codes.

(f) Read DTCs.

Result

Result	Proceed to
DTC C2173/73 is not output	A
DTC C2173/73 is output	B

NOTICE:

When DTC C2173/73 is output, troubleshoot that DTC first. Then troubleshoot DTCs C2121/21 to C2124/24 or C2125/25*.

*: w/ Spare Tire Pressure Warning Valve and Transmitter

GO TO DTC C2173/73

2.	CHECK FREQUENCY RECEIVING CONDITION

(a) Check for the following conditions:

(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 described above, the tire pressure warning light may turn on only in a particular area.

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

OK:

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

HINT:

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

CHECK IF ANY DEVICE IS INSTALLED BY USER

3.	IDENTIFY TRANSMITTER CORRESPONDING TO DTC

(a) Set the tire pressure of all tires to the specified value (See page ).

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

Tire Pressure Monitor

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
ID1 Tire Inflation Pressure	ID1 tire inflation pressure / min.: Absolute pressure 0.0 kPa (0.0 kgf/cm2, 0.0 psi), Relative pressure -100.0 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure 537.5 kPa (5.4 kgf/cm2, 78 psi)	Actual tire inflation pressure	If 0 kPa (0.0 kgf/cm2, 0.0 psi) is displayed for absolute pressure or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*1
ID2 Tire Inflation Pressure	ID2 tire inflation pressure / min.: Absolute pressure 0.0 kPa (0.0 kgf/cm2, 0.0 psi), Relative pressure -100.0 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure 537.5 kPa (5.4 kgf/cm2, 78 psi)	Actual tire inflation pressure	If 0 kPa (0.0 kgf/cm2, 0.0 psi) is displayed for absolute pressure or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*1
ID3 Tire Inflation Pressure	ID3 tire inflation pressure / min.: Absolute pressure 0.0 kPa (0.0 kgf/cm2, 0.0 psi), Relative pressure -100.0 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure 537.5 kPa (5.4 kgf/cm2, 78 psi)	Actual tire inflation pressure	If 0 kPa (0.0 kgf/cm2, 0.0 psi) is displayed for absolute pressure or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*1
ID4 Tire Inflation Pressure	ID4 tire inflation pressure / min.: Absolute pressure 0.0 kPa (0.0 kgf/cm2, 0.0 psi), Relative pressure -100.0 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure 537.5 kPa (5.4 kgf/cm2, 78 psi)	Actual tire inflation pressure	If 0 kPa (0.0 kgf/cm2, 0.0 psi) is displayed for absolute pressure or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*1
ID5 Tire Inflation Pressure*2	ID5 tire inflation pressure/ min.: Absolute pressure 0.0 kPa (0.0 kgf/cm2, 0.0 psi), Relative pressure -100.0 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure 537.5 kPa (5.4 kgf/cm2, 78 psi)	Actual tire inflation pressure	If 0 kPa (0.0 kgf/cm2, 0.0 psi) is displayed for absolute pressure or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*1

HINT:

*1: It may take approximately 2 or 3 minutes until the values are displayed.
*2: w/ Spare Tire Pressure Warning Valve and Transmitter

(h) Rapidly reduce the tire pressure of each tire by at least 40 kPa (0.4 kgf/cm2, 5.8 psi) within 30 seconds.

(i) Check the Data List.

NOTICE:

It takes approximately 2 or 3 minutes to display the updated tire pressure data.
When no "ID Tire Inflation Pressure" data has changed, reset the tire pressure to the appropriate specified value and rotate the tire 90 to 270°. Then rapidly release the tire pressure and recheck it.
Record the "ID Tire Inflation Pressure" data transmitter ID that corresponds to each tire.

(j) After confirming that the "ID Tire Inflation Pressure" data for one tire (ID1 to ID4 or ID5*) has changed, repeat this procedure for each tire. Identify the transmitter that corresponds to the DTC.

*: w/ Spare Tire Pressure Warning Valve and Transmitter

Result

Result	Proceed to
All abnormal	A
One or more transmitters abnormal	B
All normal	C

GO TO STEP 5

END

4.	CHECK HARNESS AND CONNECTOR (ECU - RECEIVER)

(a) Disconnect the F7 tire pressure warning ECU connector.

(b) Disconnect the V3 tire pressure warning antenna and receiver connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F7-12 (RDA) - V3-1 (RDA)	Always	Below 1 Ω
F7-11 (GND2) - V3-4 (GND)	Always	Below 1 Ω
F7-6 (RF5V) - V3-5 (+5V)	Always	Below 1 Ω
F7-12 (RDA) or V3-1 (RDA) - Body ground	Always	10 kΩ or higher
F7-11 (GND2) or V3-4 (GND) - Body ground	Always	10 kΩ or higher
F7-6 (RF5V) or V3-5 (+5V) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	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/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

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

(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 7

6.	REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER

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

7.	PERFORM REGISTRATION OF TRANSMITTER ID

(a) Perform registration (See page ).

8.	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
ID1 Tire Inflation Pressure	ID1 tire inflation pressure / min.: Absolute pressure 0.0 kPa (0.0 kgf/cm2, 0.0 psi), Relative pressure -100.0 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure 537.5 kPa (5.4 kgf/cm2, 78 psi)	Actual tire inflation pressure	If 0 kPa (0.0 kgf/cm2, 0.0 psi) is displayed for absolute pressure or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*1
ID2 Tire Inflation Pressure	ID2 tire inflation pressure / min.: Absolute pressure 0.0 kPa (0.0 kgf/cm2, 0.0 psi), Relative pressure -100.0 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure 537.5 kPa (5.4 kgf/cm2, 78 psi)	Actual tire inflation pressure	If 0 kPa (0.0 kgf/cm2, 0.0 psi) is displayed for absolute pressure or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*1
ID3 Tire Inflation Pressure	ID3 tire inflation pressure / min.: Absolute pressure 0.0 kPa (0.0 kgf/cm2, 0.0 psi), Relative pressure -100.0 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure 537.5 kPa (5.4 kgf/cm2, 78 psi)	Actual tire inflation pressure	If 0 kPa (0.0 kgf/cm2, 0.0 psi) is displayed for absolute pressure or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*1
ID4 Tire Inflation Pressure	ID4 tire inflation pressure / min.: Absolute pressure 0.0 kPa (0.0 kgf/cm2, 0.0 psi), Relative pressure -100.0 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure 537.5 kPa (5.4 kgf/cm2, 78 psi)	Actual tire inflation pressure	If 0 kPa (0.0 kgf/cm2, 0.0 psi) is displayed for absolute pressure or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*1
ID5 Tire Inflation Pressure*2	ID5 tire inflation pressure/ min.: Absolute pressure 0.0 kPa (0.0 kgf/cm2, 0.0 psi), Relative pressure -100.0 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure 537.5 kPa (5.4 kgf/cm2, 78 psi)	Actual tire inflation pressure	If 0 kPa (0.0 kgf/cm2, 0.0 psi) is displayed for absolute pressure or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*1

HINT:

*1: It may take approximately 2 or 3 minutes until the values are displayed.
*2: w/ Spare Tire Pressure Warning Valve and Transmitter
When no "ID Tire Inflation Pressure" data has changed, reset the tire pressure to the appropriate specified value and rotate the tire 90 to 270°. Then rapidly release the tire pressure and recheck it.

Result

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

END

9.	REPLACE TIRE PRESSURE WARNING ANTENNA AND RECEIVER

(a) Replace the tire pressure warning antenna and receiver (See page ).

10.	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
ID1 Tire Inflation Pressure	ID1 tire inflation pressure / min.: Absolute pressure 0.0 kPa (0.0 kgf/cm2, 0.0 psi), Relative pressure -100.0 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure 537.5 kPa (5.4 kgf/cm2, 78 psi)	Actual tire inflation pressure	If 0 kPa (0.0 kgf/cm2, 0.0 psi) is displayed for absolute pressure or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*1
ID2 Tire Inflation Pressure	ID2 tire inflation pressure / min.: Absolute pressure 0.0 kPa (0.0 kgf/cm2, 0.0 psi), Relative pressure -100.0 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure 537.5 kPa (5.4 kgf/cm2, 78 psi)	Actual tire inflation pressure	If 0 kPa (0.0 kgf/cm2, 0.0 psi) is displayed for absolute pressure or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*1
ID3 Tire Inflation Pressure	ID3 tire inflation pressure / min.: Absolute pressure 0.0 kPa (0.0 kgf/cm2, 0.0 psi), Relative pressure -100.0 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure 537.5 kPa (5.4 kgf/cm2, 78 psi)	Actual tire inflation pressure	If 0 kPa (0.0 kgf/cm2, 0.0 psi) is displayed for absolute pressure or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*1
ID4 Tire Inflation Pressure	ID4 tire inflation pressure / min.: Absolute pressure 0.0 kPa (0.0 kgf/cm2, 0.0 psi), Relative pressure -100.0 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure 537.5 kPa (5.4 kgf/cm2, 78 psi)	Actual tire inflation pressure	If 0 kPa (0.0 kgf/cm2, 0.0 psi) is displayed for absolute pressure or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*1
ID5 Tire Inflation Pressure*2	ID5 tire inflation pressure/ min.: Absolute pressure 0.0 kPa (0.0 kgf/cm2, 0.0 psi), Relative pressure -100.0 kPa (-1.0 kgf/cm2, -14 psi) max.: Absolute pressure 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure 537.5 kPa (5.4 kgf/cm2, 78 psi)	Actual tire inflation pressure	If 0 kPa (0.0 kgf/cm2, 0.0 psi) is displayed for absolute pressure or -100 kPa (-1.0 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*1

HINT:

*1: It may take approximately 2 or 3 minutes until the values are displayed.
*2: w/ Spare Tire Pressure Warning Valve and Transmitter
When no "ID Tire Inflation Pressure" data has changed, reset the tire pressure to the appropriate specified value and rotate the tire 90 to 270°. Then rapidly release the tire pressure and recheck it.

Result

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

END

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