Tire Pressure Warning System - Diagnostics: Other Toyota Sequoia I рестайлинг

PRECAUTION

Note. When disconnecting the battery terminal, initialize the following system after the terminal is reconnected.

SYSTEM NAME CHART

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1. TIRE PRESSURE WARNING SYSTEM PRECAUTION When the tire pressure warning lamp comes on, immediately check the tire pressure of the tire and adjust it to the specified pressure. (The tire pressure warning lamp comes on if there is an open in the tire pressure warning lamp circuit.) NOTE: Check the spare tire as well since this system monitors pressure of all tires, including the spare. TIRE SIZE CHART Tire size Front Rear Spare P245 / 70 R 16 220 kPa (2.2 kgf/cm 2 , 32 psi) 240 kPa (2.4 kgf/cm 2 , 35 psi) 240 kPa (2.4 kgf/cm 2 , 35 psi) P265 / 70 R 16 220 kPa (2.2 kgf/cm 2 , 32 psi) 220 kPa (2.2 kgf/cm 2 , 32 psi) 220 kPa (2.2 kgf/cm 2 , 32 psi) P265 / 65 R 17 220 kPa (2.2 kgf/cm 2 , 32 psi) 220 kPa (2.2 kgf/cm 2 , 32 psi) 220 kPa (2.2 kgf/cm 2 , 32 psi) When the tire pressure warning lamp blinks, there is a malfunction in the system. Check for DTCs. It is necessary to register the transmitter ID in the tire pressure monitor ECU when replacing the tire pressure monitor valve sub-assy and/or tire pressure monitor ECU (see «REGISTRATION»(ref-227586-S26672082142006040600000) ). When replacing the tire pressure monitor ECU. Using the DATA LIST, read the transmitter IDs registered in the ECU and make a note of them before removing the tire pressure monitor ECU. Register the transmitter IDs after installing a new tire pressure monitor ECU. When replacing the tire pressure monitor valve sub-assy. Make a note of the 7 digit number (transmitter ID) written on the tire pressure monitor valve sub-assy when replacing the tire pressure monitor valve sub-assy. Register the transmitter IDs in the tire pressure monitor ECU after replacing the tire pressure monitor valve sub-assy and installing the tires and wheels on the vehicle. NOTE: The transmitter ID is written on the tire pressure monitor valve sub-assy and ID can not be seen after installing the tire pressure monitor valve sub-assy on the tire and wheel. Therefore, make a note of the transmitter ID before installing the tire pressure monitor valve sub-assy.
2. IN CASE OF TIRE AND WHEEL REPLACEMENT When tires and wheels are replaced, register the transmitter ID without fail.
3. IN CASE OF TIRE ROTATION OR REPLACEMENT OF TIRE PRESSURE MONITOR ECU, TIRE PRESSURE MONITOR VALVE SUB-ASSY, OR TIRES WITH DIFFERENT TIRE PRESSURE Initialize the tire pressure warning system after one of the following is performed: Replacing the tire pressure monitor ECU or the tire pressure monitor valve sub-assy Tire rotation Replacing tires with different tire pressure HINT: The tire pressure warning system will not operate properly if it is not initialized (see «INITIALIZATION»(ref-227586-S20078512972006040600000) ).
4. FAIL-SAFE FUNCTION When a system malfunction occurs in the tire pressure warning system, the tire pressure warning lamp blinks and informs the driver of the system failure. The result of this diagnosis is stored in the tire pressure monitor ECU.

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1. DESCRIPTION OF SYSTEM A tire pressure monitor valve sub-assy equipped with a tire pressure sensor and a transmitter and is installed in a tire wheel assy. The sensor measures the tire pressure and the measured value and transmitter ID are transmitted to the tire pressure monitor receiver assy on the body as radio waves and then sent to the tire pressure monitor ECU from the tire pressure monitor receiver. If the transmitter ID has already been registered, the ECU compares the measured air pressure value with the standard value. When the value is less than the standard value registered in the tire pressure monitor ECU, the warning lamp on the combination meter comes on. To address the differences in the air pressure settings by the type of tires, or the differences in pressure between the front and rear tires, a tire pressure warning reset switch has been newly adopted. Along with the adoption of the tire pressure warning reset switch, the warning operation has been changed. TPWS transmitters with different bending angles as the tire pressure monitor valve sub-assy have been provided for steel wheels with center ornaments. (They are not interchangeable with aluminum wheels or steel wheels with full wheel caps.)
2. WHEN TIRE PRESSURE WARNING LAMP IS LIT When the warning lamp does not go off, or when it comes on during driving, check tire pressure. If the warning lamp is lit even though the tire pressure is correctly adjusted, the tire could be punctured. Under the following conditions, the system may not function properly. The areas, facilities or devices that use similar radio frequencies are located in the vicinity of the vehicle. A radio device of similar frequency is used in the vehicle. A lot of snow or ice is stuck to the vehicle, especially onto the wheels and around the wheel houses. The battery of the sensor has been depleted. The tires without tire pressure monitor valve sub-assy are used. Tire chains are used. When the spare tire is not within the receivable range of the electric wave, a signal may not be received because spare tires are fixed. Accordingly, the system may not function properly. If there is a possibility that the TPWS system does not receive a signal from the spare tire, rotate the tire 90°. HINT: If any other wheels than the specified ones are used, the system may not function properly because the radio waves are differently transmitted from the tire pressure sensor. Depending on the tire type, the system may not function properly even though the specified wheels are used. The average use life of the grommet of the tire pressure monitor valve sub-assy is approximately 5 years, at which time it must be replaced. After removing and installing the ECU or a sensor, output a diagnosis code and check that it is a normal code.
3. FUNCTION OF COMPONENTS FUNCTION OF COMPONENTS CHART Components Function Tire pressure monitor valve sub-assy Combined as a single unit with a disc wheel air valve, it measures tire pressure and temperature and transmits an ID number for measurement value and identification. Built-in the battery. Tire pressure monitor receiver assy Receives and transmits a necessary signal from the transmitter to the tire pressure monitor ECU. Tire pressure monitor ECU Receives the signal from the receiver and identifies it as vehicle's own signal. If the measurement value is equal to or lower than the specified value, it transmits a signal so that the air pressure warning lamp on the combination meter comes on. Tire pressure warning lamp Located in the combination meter, it informs the driver of lowered tire air pressure and system failure. Tire pressure warning reset switch Enters the initialization mode for tire or wheel replacement, or tire rotation
4. TIRE PRESSURE WARNING RESET SWITCH By operating the tire pressure warning reset switch, the tire pressure monitor ECU can be set to issue a warning at an inflation pressure that corresponds to the type of tires. Therefore, the dealer must set the warning threshold to the proper value in order to comply with the local regulations. Operate the tire pressure warning reset switch only after the inflation pressures of all 5 tires (including the spare) have been adjusted on the vehicle. To initialize the system, press and hold the tire pressure warning reset switch for 3 seconds or longer with the ignition switch ON. After the system has been initialized, the warning lamp blinks 3 times (1 second ON, 1 second OFF). During initialization, the tire pressure monitor valve sub-assy measures the inflation pressure of the tires, and registers the signals that are transmitted into the tire pressure monitor ECU at a frequency of one per minute. The initialization process is completed when the signals from the 5 tires have been received. The initialization process is canceled if the ignition switch is turned OFF during initialization. To initialize again, the tire pressure warning reset switch must be pressed again. For this reason, once the tire pressure warning reset switch has been pressed, turning OFF the ignition switch is not recommended for a minimum of 20 minutes.

TERMINALS OF ECU

HINT

Inspect the connectors from the back side while the connectors are connected.

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TERMINAL DESCRIPTION CONDITION CHART

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1. CHECK BATTERY VOLTAGE Battery voltage: 11 to 14 V If the voltage is below 11 V, recharge the battery before proceeding.
2. CHECK DLC3 The vehicle's tire pressure monitor ECU uses ISO 9141-2 for communication. The terminal arrangement of DLC3 complies with SAE J1962 and matches the ISO 9141-2 format. Verify the conditions listed in the table below: TERMINAL DESCRIPTION CONDITION CHART Terminal No. Disc. Connection / Voltage or Resistance Condition 7 SIL Bus + Line / Pulse generation During transmission 4 CG Chassis Ground to Body Ground / 1 ohm or less Always 16 BAT Battery Positive to Body Ground / 10 to 14 V Always HINT: If the hand-held tester display shows UNABLE TO CONNECT TO VEHICLE when the cable of the hand-held tester is connected to DLC3, the ignition switch is turned to the ON position and the tester is operated, there is a problem on the vehicle side or tester side. If communication is normal when the tester is connected to another vehicle, inspect DLC3 on the original vehicle. If communication is still not possible when the tool is connected to another vehicle, the problem is probably in the tester itself, so consult the Service Department listed in the tester's instruction manual.
3. DIAGNOSIS SYSTEM Warning lamp The tire pressure warning lamp blinks when there is any malfunction in the tire pressure warning system. NOTE: When the malfunction has been corrected, the tire pressure warning lamp does not come on. DTCs (Normal mode) DTCs are memorized in the tire pressure monitor ECU and read by the blinks of the tire pressure warning lamp or using the hand-held tester (see «DTC CHECK/CLEAR»(ref-227586-S08354131422006040600000) . Test mode By switching from normal mode into test mode (input signal check), you can inspect the tire pressure monitor receiver assy, each tire pressure monitor valve sub-assy and vehicle speed sensor (see «TEST MODE PROCEDURE»(ref-227586-S09793559972006040600000) ).
4. CHECK WARNING LAMP Turn the ignition switch to the ON position. Check that the tire pressure warning lamp comes on for 3 seconds. If the warning check result is not normal, proceed to the troubleshooting for the tire pressure warning lamp circuit. TROUBLE AREA Trouble Area Refer To Tire pressure warning lamp circuit «TIRE PRESSURE WARNING LAMP CIRCUIT»(ref-227586-S18915071642006040600000)
5. TIRE PRESSURE WARNING LAMP CHART HINT: The table below indicates the state of the tire pressure warning lamp after the ignition switch is turned ON. *1: Comes on and goes off repeatedly at 0.5 second intervals. *2: Comes on and goes off repeatedly at 0.25 second intervals. *3: Comes on and goes off repeatedly at 0.125 second intervals.

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1. DTC CHECK (USING SST CHECK WIRE) Check DTCs. Using the SST, connect terminals TC and CG of DLC3. SST 09843-18040 Turn the ignition switch to the ON position. Read and record any DTCs from the tire pressure warning lamp on the combination meter. Refer to the illustration below for examples of a normal system code and codes 13 and 33. HINT: If the tire pressure warning lamp does not blink any DTCs or the normal system code, inspect the tire pressure warning lamp circuit or TC terminal circuit. TROUBLE AREA Trouble Area Refer To Tire pressure warning lamp circuit «TIRE PRESSURE WARNING LAMP CIRCUIT»(ref-227586-S18915071642006040600000) TC terminal circuit «TC AND CG TERMINAL CIRCUIT»(ref-227586-S22960948962006040600000) If 2 or more malfunctions are indicated at the same time, the lowest numbered DTC is displayed first. Refer to the Diagnostic Trouble Code Chart (see «DIAGNOSTIC TROUBLE CODE CHART»(ref-227586-S32884222112006040600000) ) for DTC information. After completing the check, turn the ignition switch off and remove the SST from DLC3. SST 09843-18040
2. DTC CHECK (USING HAND-HELD TESTER) Check DTCs. Connect the hand-held tester to the DLC3. Turn the ignition switch to the ON position. Read the DTCs following the prompts on the tester screen. HINT: Refer to the hand-held tester operator's manual for further details.
3. DTC CLEAR HINT: After repairing the malfunctions, clear the DTCs. Connect the hand-held tester to DLC3. Turn the ignition switch to the ON position. Erase the DTCs following the prompts on the tester screen. HINT: Refer to the hand-held tester operator's manual for further details.

Identify Transmitter (Error In Present)

HINT

1. Refer to IDENTIFY TRANSMITTER (ERROR IN PRESENT) if the DTC is output currently. Refer to IDENTIFY TRANSMITTER (ERROR IN PAST) if a previously output DTC is not output now. Even when DTCs C2165/65 to C2169/69 are output both as present and past codes, refer to IDENTIFY TRANSMITTER (ERROR IN PAST).
2. DTCs relevant to the transmitters are corresponding to each transmitter ID. It is impossible to identify which tire is malfunctioning according to each transmitter ID. Therefore the following procedures must be followed to confirm the ID No. and tire location.

Identify Transmitter (Error In Past)

HINT

1. Refer to IDENTIFY TRANSMITTER (ERROR IN PRESENT) if the DTC is output currently. Refer to IDENTIFY TRANSMITTER (ERROR IN PAST) if a previously output DTC is not output now. Even when DTCs C2165/65 to C2169/69 are output both as present and past codes, refer to IDENTIFY TRANSMITTER (ERROR IN PAST).
2. DTCs relevant to the transmitters are corresponding to each transmitter ID. It is impossible to identify which tire is malfunctioning according to each transmitter ID. Therefore the following procedures must be followed to confirm the ID No. and tire location.
3. The following are the procedures to identify which wheel's transmitter ID1 is resulting from when assuming that either of the DTCs C2141/41 (Transmitter ID1 error) or C2165/65 (Abnormal temperature inside ID1 tire) is detected. Identify the corresponding transmitter using the same procedures when DTCs C2142/42 to C2145/45, C2166/66 to C2169/69 are detected.