Toyota Tacoma (2015-2018) Service Manual: Tire Position Not Identified

Toyota Tacoma (2015-2018) Service Manual / Tire And Wheel / Tire Pressure Warning System / Tire Position Not Identified

DESCRIPTION

The tire pressure warning ECU and receiver identifies the tire position for each tire pressure warning valve and transmitter according to the wheel speed signals from the skid control ECU and acceleration rate signal from each acceleration sensor built into each tire pressure warning valve and transmitter, and sends this information to be stored in the main body ECU.

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.

HINT:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.	IDENTIFY TIRE POSITION FOR EACH TIRE PRESSURE WARNING VALVE AND TRANSMITTER

(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.

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.*
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.*
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.*
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.*

HINT:

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

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

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.

(i) Read the "ID Tire Inflation Pressure" value and identify the tire with reduced pressure, and record the corresponding tire pressure warning valve and transmitter (ID1 to ID4).

(j) Repeat for each tire.

(k) Set the tire pressure to the specified value (See page ).

2.	PERFORM INITIALIZATION

(a) Leave the vehicle with the ignition switch turned off for 15 minutes or more.

(b) Perform initialization to clear the existing tire position information (See page ).

3.	IDENTIFY TIRE POSITION DURING DRIVING

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn left or right at least 3 times within the trip.

(e) Turn the Techstream on.

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

(g) Without turning off the ignition switch, check the tire position for each transmitter.

Tire Pressure Monitor

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
ID1 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.
ID2 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.
ID3 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.
ID4 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.

Result	Proceed to
A transmitter with its tire position as "Judging" exists.	A
No transmitter with its tire position as "Judging" exists, and no tire pressures are displayed on the multi-information display.	B
No transmitter with its tire position as "Judging" exists, and tire pressures are displayed on the multi-information display.	C

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

END

4.	CHECK TIRE PRESSURE WARNING VALVE AND TRANSMITTER

(a) Without turning off the ignition switch, check each transmitter with its tire position displayed as "Judging".

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

(c) Without turning off the ignition switch, check the number of times the transmitter signal and speed sensor signal have synchronized.

Tire Pressure Monitor (Example: Transmitter ID1 installed to front wheel LH)

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
ID1 - FL Wheel Speed Synchronization Count	ID1 - FL Wheel Speed Synchronization Count/min.: 0, max.: 255	Actual Synchronization Count	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

ID1 - FL Wheel Speed Synchronization Count

ID1 - FL Wheel Speed

Synchronization Count/min.: 0, max.: 255

Actual Synchronization Count

OK:

The transmitter signal and speed sensor signal have synchronized one or more times.

REPLACE CORRESPONDING TIRE PRESSURE WARNING VALVE AND TRANSMITTER

5.	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.

(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.

IDENTIFY TIRE POSITION DURING DRIVING AGAIN

CHECK IF ANY DEVICE IS INSTALLED BY USER

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