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Home >> Lexus >> 2002 >> SC 430 V8-4.3L (3UZ-FE) >> Repair and Diagnosis >> Steering and Suspension >> Wheels and Tires >> Tire Monitoring System >> Testing and Inspection >> Reading and Clearing Diagnostic Trouble Codes >> Reading Diagnostic Trouble Codes

Reading Diagnostic Trouble Codes

NOTE: This is the only information provided by the manufacturer for reading Diagnostic Trouble Codes for this system.

PRE-CHECK

1. DESCRIPTION
a. DIAGNOSIS SYSTEM
1. When troubleshooting is conducted for Multiplex OBD (M-OBD) vehicles, the only difference from the usual troubleshooting procedure is that the LEXUS hand-held tester is to be connected to read off various data output from the vehicle's tire pressure control ECU.
The tire pressure control ECU records the corresponding DTC when the computer detects a malfunction in the computer itself or its circuit.
To check DTC, connect a LEXUS hand-held tester to DLC3 on the vehicle. The LEXUS hand-held tester enables you to erase DTC and various forms on tire pressure control data.







b. DATA LINK CONNECTOR 3 (DLC3)
1. The tire pressure control ECU uses ISO 14230 for communication. The terminal arrangement of DLC3 complies with SAE J1962 and matches the ISO 14230 format.

HINT: If the display shows "UNABLE TO CONNECT TO VEHICLE" when the LEXUS hand-held tester cable is connected to DLC3, the ignition switch is turned ON and the LEXUS hand-held tester is operated, there is a problem on the vehicle side or the 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 tester is connected to another vehicle, the problem is probably in the tester itself, so consult the Service Department listed in the tester's Operator's Manual.

2. DIAGNOSIS SYSTEM




a. Inspect the battery positive voltage.
Battery positive voltage: 10 - 14 V
b. Perform visual check.
c. Check the warning light.
1. Turn the ignition switch to ON, and check that the tire pressure warning light goes on for 3 seconds.

HINT: If the check result is not normal, proceed to troubleshooting for the tire pressure warning light circuit.




d. In case of not using the LEXUS hand-held tester:
Check the DTC:
1. Using SST connect terminals Tc and CG of DLC3.
SST 09843 - 18040
2. Turn the ignition switch ON.
3. Read the DTC from the tire pressure warning light on the combination meter.

HINT:

- If no code appears, inspect the Tc circuit.

Trouble Area

Tc terminal circuit




- As an example, the blinking patterns for the normal code and codes 16 and 56 are shown.

4. Refer to the code table.
If 2 or more fault codes are detected at the same time, DTC will be displayed in order of increasing number.
5. After the check, turn the ignition switch OFF, and remove the SST from DLC3.

e. In case of using the LEXUS hand-held tester:
Check the DTC.
1. Hook up the LEXUS hand-held tester to DLC3.
2. Turn the ignition switch ON.
3. Read the DTC by following the prompts on the tester screen.

HINT: Refer to the LEXUS hand-held tester operators manual for further details.

4. Remove the LEXUS hand-held tester from the terminals of DLC3.




f. In case of not using the LEXUS hand-held tester:
Clear the DTC.
1. Turn the ignition switch ON.
2. Using SST, connect terminals Tc and CG of DLC3.
SST 09843 - 18040




3. Within 15 seconds after connecting terminals Tc and CG, change the switch between "Main" and "2nd" 4 cycles or more.
4. Check that the lighting pattern of the tire pressure warning light shows the normal code.
5. Remove the SST from the terminals of DLC3.

SST 09843 - 18040

g. In case of using the LEXUS hand-held tester:
Clear the DTC.
1. Hook up the LEXUS hand-held tester to DLC3.
2. Turn the ignition switch ON.
3. Operate the LEXUS hand-held tester to erase the codes

HINT: Refer to the LEXUS hand-held tester operator's manual for further details.

4. Remove the LEXUS hand-held tester from the terminals of DLC3.

3. IDENTIFY TRANSMITTER CORRESPONDING TO DTC (ERROR IN PRESENT)
a. Set the inflation pressure of all tires to the normal set value.
b. Rapidly reduce the pressure of one of any tires to 120 kPa (1.2 kgf/sq.cm, 17 psi) and leave it as it is for 30 seconds.

NOTE: Rapidly reduce the inflation pressure of the tires, one by one.

HINT: When rapidly reducing the tire inflation pressure, loosen the valve core.

c. Using a LEXUS hand-held tester, check the inflation pressure data of each wheel.
d. Check that one of the data shows 120 kPa (1.2 kgf/sq.cm, 17 psi).

NOTE: When rapidly reducing another tire inflation pressure, keep the pressure of the checked wheel(s) at 120 kPa (1.2 kgf/sq.cm, 17 psi).

HINT:
- If one of them does not show 120 kPa (1.2 kgf/sq.cm, 17 psi), it means that the tire pressure monitor valve sub-assembly for the tire of rapidly reduced pressure corresponds to the output DTC.
- If one of the data shows 120 kPa (1.2 kgf/sq.cm, 17 psi), perform the same procedure to other tires.

4. IDENTIFY TRANSMITTER CORRESPONDING TO DTC (ERROR IN PRESENT OR PAST)
a. Set the inflation pressure of all tires to the normal set value.
b. Rapidly reduce the pressure of one of any tires to 120 kPa (1.2 kgf/sq.cm, 17 psi) and leave it as it is for 30 seconds.

NOTE: Rapidly reduce the inflation pressure of the tires, one by one.

HINT: When rapidly reducing the tire inflation pressure, loosen the valve core.

c. Using a LEXUS hand-held tester, check the inflation pressure data of ID1 wheel.
d. Check that one of the data shows 120 kPa (1.2 kgf/sq.cm, 17 psi).

NOTE: When rapidly reducing another tire inflation pressure, keep the pressure of the checked wheel(s) at 120 kPa (1.2 kgf/sq.cm, 17 psi).

HINT:
- If the data of ID1 shows 120 kPa (1.2 kgf/sq.cm, 17 psi), it means that the tire pressure monitor valve sub-assembly for the tire of rapidly reduced pressure is ID1.
- If the data of ID1 does not shows 120 kPa (1.2 kgf/sq.cm, 17 psi), perform the same procedure to other tires to identify the faulty tire pressure monitor valve sub-assembly.

5. CHECK THAT TRANSMITTER BUILT IN VEHICLE IS REGISTERED TO EITHER "Main" or "2nd"
a. Set tire inflation pressure to the normal value.
b. Set the tire pressure warning switch to "Main".
c. Turn the ignition switch ON.
d. Rapidly reduce the inflation pressure of any one of the wheels to 120 kPa (1.2 kgf/sq.cm, 17 psi).

HINT: When rapidly reducing the tire inflation pressure, loosen the valve core.

e. Check that the tire pressure warning light is lit and one of the pressure data shows 120 kPa (1.2 kgf/sq.cm, 17 psi) on the LEXUS hand-held tester.

HINT:
- If the above is identified, the transmitter is registered to "Main".
- If not, set the tire pressure warning switch to "2nd" and perform the same procedure.
- If the above is identified with the tire pressure warning switch set to "2nd", the transmitter is registered to "2nd".
- If it cannot be registered to any of "Main" and "2nd", perform troubleshooting according to the Problem Symptoms Table.

6. REFERENCE VALUE OF ECU DATA
a. Hook up the LEXUS hand-held tester to DLC3.

Part 1:




Part 2:




b. Monitor the ECU data by following the prompts on the tester screen.
Please refer to the LEXUS hand-held tester operator's manual for more information.

7. REGISTER TRANSMITTER ID
a. Set the inflation pressure of all tires to the normal value.
b. Connect the LEXUS hand-held tester to DLC3.
c. Turn the ignition switch ON.
d. When registering to "Main":
1. Using the LEXUS hand-held tester, select the registration mode, "Main".
2. Forcibly transmit the transmitter IDs for all wheels.

HINT:
- The transmitter ID can be transmitted by rapidly reducing the tire inflation pressure.
- When rapidly reducing the pressure, loosen the valve core.
- Increase or decrease the tire inflation pressure by 20 kPa (0.2 kgf/sq.cm, 2.9 psi) or more within 15 seconds for each tire.

3. Using the LEXUS hand-held tester, make sure that the number of the registered ID is 4.

HINT: If the operation of step (d) does not complete within 5 minutes, it will return to the normal operation mode. Also, if the number of the registered ID is less than 4 after 5 minutes has elapsed, turning on the ignition switch will make the tire pressure warning light light up for 3 seconds, go out for 0.5 seconds, then up again and remain ON in the normal operation mode. In this case, do the operation again from the start.

e. When registering to "2nd":
1. Using the LEXUS hand-held tester, select the registration mode, "2nd".
2. Forcibly transmit the transmitter IDs for all wheels.

HINT:
- The transmitter ID can be transmitted by rapidly reducing the tire inflation pressure.
- When rapidly reducing the pressure, loosen the valve core.
- Increase or decrease the tire inflation pressure by 20 kPa (0.2 kgf/sq.cm, 2.9 psi) or more within 15 seconds for each tire.

3. Using the LEXUS hand-held tester, make sure that the number of the registered ID is 4.

HINT: If the operation of step (e) does not complete within 5 minutes, it will return to the normal operation mode. Also, if the number of the registered ID is less than 4 after 5 minutes has elapsed, turning on the ignition switch will make the tire pressure warning light light up for 3 seconds, go out for 0.5 seconds, then up again and remain ON in the normal operation mode. In this case, do the operation again from the start.

f. Using the LEXUS hand-held tester, check that the last 3 bits of the 4 registered ID codes are different each other.
g. Setting the inflation pressure of all tires to normal value completes the transmitter ID registration.
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