Toyota 4Runner: Transmitter ID not Received in Main Mode (C2126/26)

Toyota 4Runner Service Manual / Suspension / Tire Pressure Monitoring / Tire Pressure Warning System / Transmitter ID not Received in Main Mode (C2126/26)

DESCRIPTION

After all IDs are registered, DTC C2126/26 is stored in the tire pressure warning ECU and the tire pressure warning light blinks for 1 minute and then comes on.

When the tire pressure warning ECU successfully receives information from all the transmitters whose IDs are stored in the ECU, DTC C2126/26 is cleared and the tire pressure warning light goes off.

DTC No.	DTC Detection Condition	Trouble Area
C2126/26	After ID registration is completed, the ECU does not receive information from transmitters whose IDs are stored in the ECU.	ID registration failure Tire pressure warning valve and transmitter Tire pressure warning antenna and receiver Tire pressure warning ECU

HINT:

If the IDs stored in the tire pressure warning ECU differ from the transmitter IDs, DTC C2126/26 is stored. Check that the IDs in the ECU are the same as the transmitter IDs.

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.	IDENTIFY TRANSMITTER NOT RECEIVED

(a) Set the tire pressure to the appropriate 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 not received.

*: w/ Spare Tire Pressure Warning Valve and Transmitter

Result

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

END

2.	CHECK TRANSMITTER ID

GO TO STEP 4

3.	REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER

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

4.	PERFORM REGISTRATION OF TRANSMITTER ID

(a) Perform registration (See page ).

5.	CONFIRM TIRE INFLATION PRESSURE (DATA LIST)

END

6.	REPLACE TIRE PRESSURE WARNING ANTENNA AND RECEIVER

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

7.	CONFIRM TIRE INFLATION PRESSURE (DATA LIST)

END

REPLACE TIRE PRESSURE WARNING ECU

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