Toyota 4Runner: Transmitter ID1 Error (C2141/41-C2145/45)

Toyota 4Runner Service Manual / Suspension / Tire Pressure Monitoring / Tire Pressure Warning System / Transmitter ID1 Error (C2141/41-C2145/45)

DESCRIPTION

The tire pressure warning valve and transmitters that are installed in the tire and wheel assemblies measure the air 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 air pressure values with the air pressure threshold. When the measured air pressure value is less than this threshold, the warning light in the combination meter illuminates.

When the internal circuit of a tire pressure warning valve and transmitter is malfunctioning, one of these DTCs is stored.

DTC Code	Detection Condition	Trouble Area
C2141/41 C2142/42 C2143/43 C2144/44 C2145/45*	If an "ERROR" signal is received 3 times consecutively, the tire pressure warning valve and transmitter is judged as defective and a DTC is stored. This happens in situations where the inflation pressure is outside the range of -100.0 to 537.5 kPa (-1.0 to 5.4 kgf/cm2, -14 psi to 78 psi), the temperature inside the tire is outside the specified range of -40 to 120°C (-40 to 253°F), or an error occurs in the tire pressure warning valve and transmitter or the surrounding area.	Tire pressure warning valve and transmitter Tire pressure warning ECU

DTC Code

Detection Condition

Trouble Area

C2141/41

C2142/42

C2143/43

C2144/44

C2145/45*

If an "ERROR" signal is received 3 times consecutively, the tire pressure warning valve and transmitter is judged as defective and a DTC is stored.

This happens in situations where the inflation pressure is outside the range of -100.0 to 537.5 kPa (-1.0 to 5.4 kgf/cm2, -14 psi to 78 psi), the temperature inside the tire is outside the specified range of -40 to 120°C (-40 to 253°F), or an error occurs in the tire pressure warning valve and transmitter or the surrounding area.

Tire pressure warning valve and transmitter
Tire pressure warning ECU

*: w/ Spare Tire Pressure Warning Valve and Transmitter

HINT:

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

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 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 "ID Tire Inflation Pressure" data for each wheel using the Techstream.

(h) Rapidly reduce the tire pressure of each tire by at least 40 kPa (0.4 kgf/cm2, 5.8 psi) within 30 seconds. If "ID Tire Inflation Pressure" data displayed on the Techstream (ID1 to ID4 or ID5*) does not change, the tire pressure warning valve and transmitter corresponding to the unchanged "ID Tire Inflation Pressure" data is the cause of the output DTC.

*: w/ Spare Tire Pressure Warning Valve and Transmitter

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" data (ID1 to ID4 or ID5*) corresponds to which tire.
- *: w/ Spare Tire Pressure Warning Valve and Transmitter

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. If the values are not displayed after a few minutes, perform troubleshooting according to the inspection procedure for DTCs C2121/21 to C2124/24 or C2125/25*2 (See page ).

*2: w/ Spare Tire Pressure Warning Valve and Transmitter

(i) Check the Data List.

Result

Result	Detection Condition
"Tire Inflation Pressure" data (ID1 to ID4 or ID5*) changed	Normal
One of "Tire Inflation Pressure" data did not change	Transmitter corresponding to DTC

*: w/ Spare Tire Pressure Warning Valve and Transmitter

NOTICE:

When "ID Tire Inflation Pressure" data has not changed, reset the tire pressure to the appropriate specified value and rotate the tire 90 to 270°. Then forcibly transmit the transmitter ID and recheck.
Record the transmitter ID and position of transmitters that are normal.

(j) When an "ID Inflation Pressure" data value (one of ID1 to ID4 or ID5*) has changed, repeat this procedure for each tire.

*: w/ Spare Tire Pressure Warning Valve and Transmitter

(k) When all of the "ID Tire Inflation Pressure" data (ID1 to ID4 or ID5*) has changed, identify the malfunctioning tire pressure warning valve and transmitter using the recorded ID numbers and output DTC.

*: w/ Spare Tire Pressure Warning Valve and Transmitter

(l) Set the tire pressures of all tires to the specified values (See page ).

2.	REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER

(a) Replace the identified tire pressure warning valve and transmitter with a new one (See page
).

HINT:

Before installing a new tire pressure warning valve and transmitter, read and write down its transmitter ID.
The IDs for the tire pressure warning valve and transmitters that are not replaced should be checked using the Techstream and recorded.

3.	PERFORM REGISTRATION OF TRANSMITTER ID

(a) Register the transmitter IDs for all wheels (See page ).

4.	CONFIRM TIRE INFLATION PRESSURE (DATA LIST)

END

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