Tire & Wheel: Overview Lexus IS II

DESCRIPTION

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

Under the following conditions below, the tire pressure warning antenna is unable to receive the signals from the tire pressure warning valves and transmitters, and a DTC is output.

1. Areas, 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.

HINT

When no signals received for 30 minutes or more, a DTC is output.

DTCs C2121/21 to C2124/24 can only be cleared by using the tester. DTCs C2181/81 to C2184/84 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 are output only in test mode.

When any of the DTCs from C2111/11 to C2114/14 are detected, DTCs from C2121/21 to C2124/24 will not output simultaneously.

DIAGNOSTIC REFERENCE

HINT

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

Scheme 1

Note. When replacing the tire pressure warning ECU, read the IDs stored in the ECU using the intelligent tester and note them down before removal. It is necessary to perform initialization (See INITIALIZATION ) after registration (See REGISTRATION ) of the transmitter IDs into the tire pressure warning ECU after the ECU or valve and transmitter has been replaced.

HINT

Set the tire pressure to the specified value.

Scheme 2

1. CHECK FREQUENCY RECEIVING CONDITION Check if the vehicle is located in areas as described below: Areas, facilities or devices that use similar radio frequencies are located in the vicinity of the vehicle. HINT: If the vehicle is located in areas described above, the tire pressure warning light may come on only in a particular area. Devices using similar radio frequencies are used in the vehicle. HINT: Radio frequency may be interrupted according to surroundings or devices installed by user. NG: CHECK IF ANY DEVICE IS INSTALLED BY USER OK: Go To Next Step
2. CHECK DTC Check for a DTC (See «PROBLEM SYMPTOMS TABLE»(ref-235571-S26696990082006062400000) ). Result RESULT Condition Proceed to Any of the DTCs from C2111/11 to C2114/14 are output. A Any of the DTCs from C2121/21 to C2124/24 are output. B B: Go to STEP 4 A: Go To Next Step
3. PERFORM FORCED TRANSMISSION OF TRANSMITTER ID OF 4 WHEELS Set the tire pressure to the specified value. Connect the intelligent tester to the DLC3. Turn the engine switch on (IG) and turn the tester ON. Select "Tire Inflation Pressure" by following the prompts displayed on the intelligent tester. INFLATION PRESSURE REFERENCE Item Measurement Item/Range (display) Normal Condition Diagnostic Note ID1 Tire Inflation Pressure ID1 tire inflation pressure/ min.: 0 kPa (0 kgf/cm 2, 0 psi), max.: 637.5 kPa (6.48 kgf/cm 2, 92.2 psi) Actual tire inflation pressure - ID2 Tire Inflation Pressure ID2 tire inflation pressure/min.: 0 kPa (0 kgf/cm 2, 0 psi), max.: 637.5 kPa (6.48 kgf/cm 2, 92.2 psi) Actual tire inflation pressure - ID3 Tire Inflation Pressure ID3 tire inflation pressure/min.: 0 kPa (0 kgf/cm 2, 0 psi), max.: 637.5 kPa (6.48 kgf/cm 2, 92.2 psi) Actual tire inflation pressure - ID4 Tire Inflation Pressure ID4 tire inflation pressure/min.: 0 kPa (0 kgf/cm 2, 0 psi), max.: 637.5 kPa (6.48 kgf/cm 2, 92.2 psi) Actual tire inflation pressure - Rapidly release the pressures from each wheel by approximately 40 kPa (0.4 kgf/cm 2, 5.8 psi)/30 seconds or more. Check that each tire pressure data displayed on the intelligent tester screen has changed. OK: Each tire pressure data displayed on the intelligent tester screen will change to the value of the tire pressure. NOTE: It takes about 1 minute or more to display the updated tire pressure data. When the "Tire Inflation Pressure" data 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 it. After confirming that all of the tire pressure data displayed on the intelligent tester screen have changed, set the tire pressures to the appropriate specified values. HINT: If the tire pressure data displayed on the intelligent tester screen has not changed after rechecking, go to other problem procedure (For malfunction in transmission or reception function (See «DTC C2141/41 Transmitter ID1 Error: DTC C2142/42 Transmitter ID2 Error: DTC C2143/43 Transmitter ID3 Error: DTC C2144/44 Transmitter ID4 Error»(ref-235571-S09359324432006062400000) ). NG: Go to step 4 OK: END
4. CHECK DTC Check for a TEST MODE DTC (See «TEST MODE PROCEDURE»(ref-235571-S13009307722006062400000) ). DTC REFERENCE Condition Proceed to DTC C2195/95 is output. A (See «DTC C2195/95 Multi-receiver Antenna Circuit (Test Mode DTC)»(ref-235571-S22261407722006062400000) ) DTC C2195/95 is not output. B A: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS B: Go To Next Step
5. CHECK DTC Check for a DTC (See «PROBLEM SYMPTOMS TABLE»(ref-235571-S26696990082006062400000) ). Result DTC REFERENCE Condition Proceed to DTC C2176/76 is output. A (See «DTC C2176/76 Receiver Error»(ref-235571-S25660765312006062400000) ) DTC C2176/76 is not output. B A: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS B: Go To Next Step
6. CHECK DTC Check for DTC (See «PROBLEM SYMPTOMS TABLE»(ref-235571-S26696990082006062400000) ). Result RESULT Condition Proceed to Any of the DTCs from C2111/11 to C2114/14 or C2121/21 to C2124/ 24 are output. A All of the DTCs from C2111/11 to C2114/14 or C2121/21 to C2124/24 are output. B A: Go to STEP 9 B: Go To Next Step
7. CHECK TIRE PRESSURE WARNING SELECT SWITCH Switch the tire pressure warning select switch to the other position (MAIN to 2nd or 2nd to MAIN). HINT: If the IDs of the installed tire and wheel set and the select switch do not match, this DTC will be output. Read the values of DATA LIST. Select TIREPRESS by following the prompts displayed on the intelligent tester. HINT: It may take up to 1 minute to display the tire pressure data. PRESSURE CONDITION REFERENCE Condition Proceed to All tire pressure readings are equal to specified values. A Tire pressure values not display. B B: Go to step 8 A: END
8. RETURN TIRE PRESSURE WARNING SELECT SWITCH TO ORIGINAL POSITION HINT: Return the tire pressure warning select switch to the position before switching in the previous step. NEXT: Go To Next Step
9. IDENTIFY TRANSMITTER CORRESPONDING TO DTC Set the tire pressure to the appropriate specified values. Select the "Tire inflation Pressure" by following the prompts displayed on the intelligent tester. INFLATION PRESSURE Item Measurement Item/Range (display) Normal Condition Diagnostic Note ID1 Tire Inflation Pressure ID1 tire inflation pressure/min.: 0 kPa (0 kgf/cm 2 , 0 psi), max.: 637.5 kPa (6.48 kgf/cm 2 , 92.2 psi) Actual tire inflation pressure - ID2 Tire Inflation Pressure ID2 tire inflation pressure/min.: 0 kPa (0 kgf/cm 2 , 0 psi), max.: 637.5 kPa (6.48 kgf/cm 2 , 92.2 psi) Actual tire inflation pressure - ID3 Tire Inflation Pressure ID3 tire inflation pressure/min.: 0 kPa (0 kgf/cm 2 , 0 psi), max.: 637.5 kPa (6.48 kgf/cm 2 , 92.2 psi) Actual tire inflation pressure - ID4 Tire Inflation Pressure ID4 tire inflation pressure/ min.: 0 kPa (0 kgf/cm 2 , 0 psi), max.: 637.5 kPa (6.48 kgf/cm 2 , 92.2 psi) Actual tire inflation pressure - Rapidly reduce the tire pressure for each wheel by approximately 40 kPa (0.4 kgf/cm 2 , 58 psi)/30 sec. or more. Check the DATA LIST. Result RESULT Condition Detection Condition One of "Tire Inflation Pressure" data (ID1 to ID4) changed Normal No "Tire Inflation Pressure" data changed Transmitter corresponding to DTC NOTE: It takes about 1 minute or more to display the updated tire pressure data. When no "Tire Inflation Pressure" data has 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 it. Record the transmitter ID of which "Tire Inflation Pressure" data corresponds to each tire. After confirming that one of "Tire Inflation Pressure" data (ID1 to ID4) has changed, repeat this procedure one by one. And identify the transmitter that is corresponding to DTC. NEXT: Go To Next Step
10. INSPECT TIRE PRESSURE WARNING VALVE AND TRANSMITTER Select REGIT ID CODE by following the prompts displayed on the intelligent tester. WARNING VALVE AND TRANSMITTER Item Measurement Item/Range (Display) Normal Condition Diagnostic Note REGIT ID1 CODE Registered ID1 code/min.: 0, max.: FFFFFF* The ID No. registered in the transmitter ID1 is displayed *: Displayed only when the ID No. is not registered. REGIT ID2 CODE Registered ID2 code/min.: 0, max.: FFFFFF* The ID No. registered in the transmitter ID2 is displayed *: Displayed only when the ID No. is not registered. REGIT ID3 CODE Registered ID3 code/min.: 0, max.: FFFFFF* The ID No. registered in the transmitter ID3 is displayed *: Displayed only when the ID No. is not registered. REGIT ID4 CODE Registered ID4 code/min.: 0, max.: FFFFFF* The ID No. registered in the transmitter ID4 is displayed *: Displayed only when the ID No. is not registered. Check for the ID number on the identified transmitter by removing it from the tire and wheel. Confirm that the ID number on the transmitter and recorded transmitter ID are matched. Result RESULT Result Proceed to Matched A Unmatched B B: PERFORM REGISTRATION (TRANSMITTER ID) A: Go To Next Step
11. REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER HINT: (See «WIRING DIAGRAM»(ref-235571-S37762341802006062400000) ) NEXT: Go To Next Step
12. REGISTRATION OF TRANSMITTER ID Perform registration (See «REGISTRATION»(ref-235571-S01517126292006062400000) ) NEXT: Go To Next Step
13. PERFORM INITIALIZATION Perform initialization (See «INITIALIZATION»(ref-235571-S20591791182006062400000) ). NEXT: Go To Next Step
14. READ VALUE OF DATA LIST Read the values of DATA LIST. Select TIREPRESS by following the prompts displayed on the intelligent tester. HINT: It may take up to 1 minute to display the tire pressure data. PRESSURE DATA Condition Proceed to All tire pressure readings are equal to specified values. A Tire pressure values not display. B B: REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER A: END

The tire pressure warning valve and transmitters that are installed in the tire and wheel assemblies measure the air pressures of the tires. The measured values are transmitted to the tire pressure warning antenna on the body as radio waves and then sent to the tire pressure warning ECU and receiver. 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 comes on. When the internal circuit of the tire pressure warning valve and transmitter is defected, this DTC is output.

DIAGNOSTIC REFERENCE

HINT

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

Note. When replacing the tire pressure warning ECU and receiver, read the IDs stored in the ECU using the intelligent tester and note them down before removal. It is necessary to perform initialization (See INITIALIZATION ) after registration (See HOW TO PROCEED WITH TROUBLESHOOTING ) of the transmitter IDs into the tire pressure warning ECU and receiver after the ECU or valve and transmitter has been replaced.

The tire pressure warning valve and transmitter measures internal temperature of tires as well as tire pressure, and transmits the information to the tire pressure warning ECU and receiver along with the transmitter ID. If the measured temperature is out of the specified range, the tire pressure warning ECU and receiver recognizes it as a malfunction, outputs DTCs, and blinks the tire pressure warning light.

DIAGNOSTIC REFERENCE

HINT

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

Note. It is necessary to perform initialization (See INITIALIZATION ) after registration (See HOW TO PROCEED WITH TROUBLESHOOTING ) of the transmitter IDs into the tire pressure warning ECU after the tire pressure warning valve and transmitter have been replaced.

HINT

Set the tire pressure to the specified value.

Each ID of the tire pressure warning valve and transmitter is registered to the tire pressure warning ECU and receiver. When the ECU detects that the ID is not the one of registered IDs, or cannot receive the ID signal, a DTC is output.

DIAGNOSTIC REFERENCE

Note. If any IDs are not registered for the "2nd" position of the tire pressure warning select switch, DTC C2172/72 will be output by switching the select switch to the "2nd" position. When replacing the tire pressure warning ECU and receiver, read the IDs stored in the ECU using the intelligent tester and note them down before removal. It is necessary to perform initialization (See INITIALIZATION ) after registration (See HOW TO PROCEED WITH TROUBLESHOOTING ) of the transmitter IDs into the tire pressure warning ECU and receiver after the ECU has been replaced.

The signals are transmitted to the tire pressure warning antenna on the body as radio waves and then sent to the tire pressure warning ECU and receiver.

DIAGNOSTIC REFERENCE

Note. When replacing the tire pressure warning ECU and receiver, read the IDs stored in the ECU using the intelligent tester and note them down before removal. It is necessary to perform initialization (See INITIALIZATION ) after registration (See HOW TO PROCEED WITH TROUBLESHOOTING ) of the transmitter IDs into the tire pressure warning ECU after the ECU has been replaced.

The initialization procedure will start when the tire pressure warning reset switch is pressed for 3 seconds or more with the ignition switch in the ON position. The tire pressure warning ECU will register the tire pressure data by the signals from the tire pressure warning valve and transmitter, and start the tire pressure warning light blinking 3 times at 1 second intervals.

DIAGNOSTIC REFERENCE

Note. If the registered set of the tires and wheels does not correspond to the selection of the tire pressure warning select switch (MAIN/2nd), DTC C2172/72 will be output. When replacing the tire pressure warning ECU and receiver, read the IDs stored in the ECU using the intelligent tester and note them down before removal. It is necessary to perform initialization (See INITIALIZATION ) after registration (See HOW TO PROCEED WITH TROUBLESHOOTING ) of the transmitter IDs into the tire pressure warning ECU and receiver after the ECU or valve and transmitter has been replaced.

HINT

Set the tire pressure to the specified value.

The tire pressure monitor ECU receives a speed signal from the combination meter. This DTC is stored upon entering the test mode, and cleared when a vehicle speed signal of 12 mph (20 km/h) is detected for 3 seconds or more. The DTC is output only in the test mode.

DIAGNOSTIC REFERENCE

Scheme 3

Note. When replacing the tire pressure warning ECU and receiver, read the IDs stored in the ECU using the intelligent tester and note them down before removal. It is necessary to perform initialization (See INITIALIZATION ) after registration (See HOW TO PROCEED WITH TROUBLESHOOTING ) of the transmitter IDs into the tire pressure warning ECU and receiver after the ECU or valve and transmitter has been replaced.

HINT

Start the inspection from step 1 when using the intelligent tester, and start from step 2 when not using the intelligent tester.

The tire pressure warning select switch has 2 positions: "MAIN" and "2nd". 2 kinds of ID (2 types of tires) for the tire pressure warning valve and transmitter can be registered to the tire pressure warning ECU and receiver.

DIAGNOSTIC REFERENCE

Scheme 4

HINT

Start the inspection from step 1 when using the intelligent tester, and from step 2 when not using the intelligent tester.

Scheme 5

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Scheme 7

1. CHECK SATELLITE SWITCH Using the satellite switch, check that the switch operates normally in the other modes. (For example: TACH INDICATOR mode) NG: Go to STEP 3 OK: Go to Next Step
2. CHECK HARNESS AND CONNECTOR (COMBINATION METER - TIRE PRESSURE WARNING ECU AND RECEIVER) Disconnect the tire pressure warning ECU and receiver J49 connector and combination meter J34 connector. Measure the resistance according to the value(s) in «RESISTANCE CONDITION TABLE»(ref-235571-S29573605612006062400000). Standard resistance RESISTANCE CONDITION TABLE Tester Connection Specified Condition J49-5 (IDSW) - J34-4 (INT) Below 1 ohms J49- 5 (IDSW) - Body ground 10 k ohms or higher NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER
3. INSPECT TIRE PRESSURE WARNING SELECT SWITCH Disconnect the satellite switch J16 connector. Measure the resistance according to the value(s) in «RESISTANCE CONDITION TABLE»(ref-235571-S00274192132006062400000). Standard resistance RESISTANCE CONDITION TABLE Switch Position Tester Connection Specified Condition Left switch on 2 (LSEL) - 5 (E) Below 1 ohms Set switch on 3 (SET) - 5 (E) Below 1 ohms Right switch on 4 (RSEL) - 5 (E) Below 1 ohms Left switch off 2 (LSEL) - 5 (E) 10 k ohms or higher Set switch off 3 (SET) - 5 (E) 10 k ohms or higher Right switch off 4 (RSEL) - 5 (E) 10 k ohms or higher HINT: When the tire select switch is faulty, replace the satellite switch and all because the former switch is included in the latter. NG: REPLACE SATELLITE SWITCH OK: Go To Next Step
4. CHECK HARNESS AND CONNECTOR (COMBINATION METER-SATELLITE SWITCH) Disconnect the satellite switch J16 connector and combination meter J35 connector. Measure the resistance according to the value(s) in «RESISTANCE CONDITION TABLE»(ref-235571-S25662579062006062400000). Standard resistance RESISTANCE CONDITION TABLE Tester Connection Specified Condition J35-6 (LSE) - J16-2 (LSEL) Below 1 ohms J35-7 (SET) - J16-3 (SET) Below 1 ohms J35-5 (RSEL) - J16-4 (RSEL) Below 1 ohms J16-5 (E) - Body ground Below 1 ohms J35-6 (LSE) - Body ground 10 k ohms or higher J35-7 (SET) - Body ground 10 k ohms or higher J35-5 (RSE) - Body ground 10 k ohms or higher NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: REPLACE COMBINATION METER

DIAGNOSTIC REFERENCE

Scheme 8

Scheme 9

Scheme 10

1. CHECK WIRE HARNESS AND CONNECTOR (TIRE PRESSURE MONITOR ECU - TIRE PRESSURE ANTENNA) Disconnect the tire pressure warning ECU and receiver J49 connector and tire pressure warning antenna A38 and Q29 connectors. Measure the resistance according to the value(s) in «RESISTANCE CONDITION TABLE»(ref-235571-S19277019112006062400000). HINT: Because the coaxial cable that is used for the tire pressure warning antenna consists of a center conductor and an outer shielding layer (-), this measurement should be performed to ensure that there is no malfunction in the coaxial cable. Standard resistance RESISTANCE CONDITION TABLE Tester Connection Specified Condition A38-1 (ANFR) - J49-8 (ANT2) Below 1 ohms Q29-1 (ANRL) - J49-9 (ANT3) Below 1 ohms A38-1 (shield wire) - J49-8 (shield wire) Below 1 ohms Q29-1 (shield wire) - J49-9 (shield wire) Below 1 ohms A38-1 (ANFR) - A38-1 (shield wire) 10 k ohms or higher Q29-1 (ANRL) - Q29-1 (shield wire) 10 k ohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go To Next Step
2. INSPECT TIRE PRESSURE WARNING ANTENNA Disconnect the tire pressure warning antenna A38 and Q29 connectors. Check for continuity between the terminals of the antenna cable core and the shield wire. HINT: Coaxial cable is used for the antenna. OK: Approx. 2 kohms NG: REPLACE TIRE PRESSURE WARNING ANTENNA OK: Go To Next Step
3. CHECK DTC Check for a TEST MODE DTC (See «TEST MODE PROCEDURE»(ref-235571-S13009307722006062400000) ). Result RESULT Condition Proceed to DTC C2195/95 is output A DTC C2195/95 is not output B A: REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER B: END

Receiving the signal from the tire pressure warning reset switch (satellite switch), the tire pressure warning ECU and receiver indicates the initialization of the pressure warning system.

Scheme 11

Scheme 12

Scheme 13

Scheme 14

1. CHECK TIRE PRESSURE WARNING RESET SWITCH FUNCTION Turn the engine switch on (IG). Check that the tire pressure warning light comes on for 3 seconds. Perform the tire pressure warning reset switch test in «TEST MODE PROCEDURE»(ref-235571-S13009307722006062400000). OK: Reset switch ON: Tire pressure warning light comes on. Reset switch OFF: Tire pressure warning light blinks. NG: Go to step 2 OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2. CHECK SATELLITE SWITCH Using the satellite switch, check that the switch operates normally in the other modes. (For example: TACH INDICATOR mode) NG: Go to STEP 4 OK: Go To Next Step
3. CHECK HARNESS AND CONNECTOR (COMBINATION METER-TIRE PRESSURE WARNING ECU AND RECEIVER)) Disconnect the tire pressure warning ECU and receiver J49 connector and combination meter J34 connector. Measure the resistance according to the value(s) in «RESISTANCE CONDITION TABLE»(ref-235571-S09712335152006062400000). Standard resistance RESISTANCE CONDITION TABLE Tester Connection Specified Condition J49-5 (IDSW) - J34-4 (INT) Below 1 ohms J49-5 (IDSW) - Body ground 10 k ohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER
4. INSPECT SATELLITE SWITCH Disconnect the satellite J16 connector. Measure the resistance according to the value(s) in «RESISTANCE CONDITION TABLE»(ref-235571-S41019762532006062400000). Standard resistance RESISTANCE CONDITION TABLE Switch Position Tester Connection Specified Condition Left switch on 2 (LSEL) - 5 (E) Below 1 ohms Set switch on 3 (SET) - 5 (E) Below 1 ohms Right switch on 4 (RSEL) - 5 (E) Below 1 ohms Left switch off 2 (LSEL) - 5 (E) 10 k ohms or higher Set switch off 3 (SET) - 5 (E) 10 k ohms or higher Right switch off 4 (RSEL) - 5 (E) 10 k ohms or higher HINT: When the tire select switch is faulty, replace the satellite switch and all because the former switch is included in the latter. NG: REPLACE SATELLITE SWITCH OK: Go To Next Step
5. CHECK HARNESS AND CONNECTOR Disconnect the satellite switch J16 connector and combination meter J35 connector. Measure the resistance according to the value(s) in «RESISTANCE CONDITION TABLE»(ref-235571-S20040625862006062400000). Standard resistance RESISTANCE CONDITION TABLE Tester Connection Specified Condition J35-6 (LSE) - J16-2 (LSEL) Below 1 ohms J35-7 (SET) - J16-3 (SET) Below 1 ohms J35-5 (RSEL) - J16-4 (RSEL) Below 1 ohms J16-5 (E) - Body ground Below 1 ohms J35-6 (LSE) - Body ground 10 k ohms or higher J35-7 (SET) - Body ground 10 k ohms or higher J35-5 (RSE) - Body ground 10 k ohms or higher NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: REPLACE COMBINATION METER

If the ECU detects trouble, the tire pressure warning light comes on and tire pressure monitor is cancelled at the same time. At this time, the ECU records a DTC in the memory.

Connect terminals TC and CG of the DLC3 to make the tire pressure warning light blink and output the DTC.

Scheme 15

Note. It is necessary to perform initialization (See INITIALIZATION ) after registration (See HOW TO PROCEED WITH TROUBLESHOOTING ) of the transmitter IDs into the tire pressure warning ECU and receiver after the ECU or valve and transmitter has been replaced.

HINT

This procedure must be performed according to the PROBLEM SYMPTOMS TABLE.

This circuit supplies power to the tire pressure warning ECU and receiver. The power is also supplied to the tire pressure warning antenna via the ECU.

The tire pressure warning system is terminated when the system has a defect of this circuit. At this time, the tire pressure warning light on the combination meter will come on.

Scheme 16

Scheme 17

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Scheme 20

1. INSPECT BATTERY Check the battery voltage. Standard voltage: 11 to 14 V NG: CHECK AND REPLACE CHARGING SYSTEM OK: Go To Next Step
2. INSPECT FUSE (ECU-IG LH) Remove the ECU-IG LH fuse from the cowl side J/B. Check continuity of the ECU-IG fuse. Standard: Continuity exists. NG: CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE OK: Go To Next Step
3. INSPECT TIRE PRESSURE WARNING ECU AND RECEIVER Remove the tire pressure monitor ECU and receiver with the connectors being connected. Turn the engine switch on. Measure the voltage according to the value(s) in «VOLTAGE CONDITION TABLE»(ref-235571-S03932147462006062400000). Standard voltage VOLTAGE CONDITION TABLE Tester Connection Specified Condition J49-1 (IG) - J49-6 (GND) 10 to 16 V NG: Go to step 4 OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
4. CHECK HARNESS AND CONNECTOR (BATTERY - TIRE PRESSURE WARNING ECU AND RECEIVER) Disconnect the tire pressure warning ECU and receiver J49 connector. Turn the engine switch on. Measure the voltage according to the value(s) in «VOLTAGE CONDITION TABLE»(ref-235571-S34521435552006062400000). Standard voltage VOLTAGE CONDITION TABLE Tester Connection Specified Condition J49-1 (IG) - Body ground 10 to 16 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go To Next Step
5. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER - BODY GROUND) Disconnect the tire pressure warning ECU and receiver J49 connector. Measure the resistance according to the value(s) in «RESISTANCE CONDITION TABLE»(ref-235571-S32598438072006062400000). Standard resistance RESISTANCE CONDITION TABLE Tester Connection Specified Condition J49-6 (GND) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

DTC output mode is set by connecting terminals TC and CG of the DLC3.

The DTCs are displayed by blinking the tire pressure warning light.

Scheme 21

HINT

When each warning light stays blinking, a ground short in the wiring of terminal TC of the DLC3 or an internal ground short in each ECU is suspected.

Scheme 22

Scheme 23

1. CHECK CAN COMMUNICATION SYSTEM AND MULTIPLEX COMMUNICATION SYSTEM Check it a DTC of CAN communication system and multiplex communication system is output. Result RESULT Condition Proceed to DTC is not output. A DTC is output. B (See «TERMINALS OF ECU»(ref-235578-S36724715152006062400000) ) B: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS A: Go To Next Step
2. CHECK HARNESS AND CONNECTOR (ECM - DLC3) disconnect ECM A6 connector. Measure the resistance according to the value(s) in «RESISTANCE CONDITION TABLE»(ref-235571-S39939441792006062400000). Standard resistance RESISTANCE CONDITION TABLE Tester connection Specified Condition A6-13 (TC) -D21-13 (TC) Below 1 ohms D21-13 (TC) - Body ground 10 k ohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go To Next Step
3. INSPECT DLC3 TERMINAL VOLTAGE Turn the engine switch on (IG). Measure the voltage according to the value(s) in «VOLTAGE CONDITION TABLE»(ref-235571-S33815216312006062400000). Standard voltage VOLTAGE CONDITION TABLE Tester Connection Specified Condition D21-13 (TC) - Body ground 10 to 14 V NG: REPLACE ECM OK: Go To Next Step
4. CHECK HARNESS AND CONNECTOR (DLC3 - BODY GROUND) Measure the resistance according to the value(s) in «RESISTANCE CONDITION TABLE»(ref-235571-S26606232912006062400000). Standard resistance RESISTANCE CONDITION TABLE Tester connection Condition Specified condition D21-4 (CG) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

Scheme 24

See also:
• ON-VEHICLE INSPECTION