Section 11 (Tire Pressure Warning System - Diagnosis): Pre-Check

1. The tire pressure warning system warns decline of the tire air pressure to the driver. When the tire pressure warning system detects the low air pressure which disturbs safe driving from any of 4 wheels, the tire pressure warning lamp comes on.

1. When the tire pressure warning lamp comes on, immediately check the air pressure of the tire and adjust it to the specified pressure (See INSPECTION ). When the ignition switch is turned OFF, the tire pressure warning lamp goes off.
2. This system needs initializing after changing tires or wheels and rotating the tires.
3. In the following cases, the system does not operate normally.
   • When vehicle speed is 30 km/h (19 mph) or less.
   • When tires size is different from that which is specified.
   • When tires of different sizes or types are used simultaneously.
   • When the spare tire or snow tires are used, or when chains are used.
   • When the vehicle is driven on unpaved, extremely rough or slippery roads.
   • When one of the tires on the vehicle is extremely worn or new.
4. When the run-flat tires are used, replace the tire if the pressure is 100 kPa (1 kgf/cm, 14 psi) or less. (if the tire is reused, it could damaged).

1. When a system malfunction occurs in the tire pressure warning system, the tire pressure warning lamp blinks.
   NOTE: If the malfunction returns to normal, the tire pressure warning lamp does not blink.
2. The result of this diagnosis is stored in the skid control ECU.

1. Based on the tire pressure warning system condition, turn the tire pressure warning lamp on as shown in the table.
   Fig 1: Identifying Tire Pressure Warning Lamp

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TIRE PRESSURE WARNING LAMP CHART: 

   Fig 2: Tire Pressure Warning Lamp Chart (1 Of 2)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 3: Tire Pressure Warning Lamp Chart (2 Of 2)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   NOTE: When the skid control ECU does not operate properly, the ABS warning lamp comes on as ABS system malfunction.

1. Check and adjust the tire air pressure to the specified value (See INSPECTION ).
2. With the vehicle stopped, turn the ignition switch ON.
3. Press the tire pressure warning switch until the tire pressure warning lamp blinks 3 times at a 1 second interval. (Continue pressing the tire pressure warning switch for approximately 3 to 4 seconds.) (Receipt of the initialization signal.)
   Fig 4: Pressing Tire Pressure Warning Switch & Inspecting Tire Pressure Warning System

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   NOTE: When the tire pressure warning lamp does not blink, PERFORM initialization again. (with the ignition switch off, PERFORM the procedure above starting at step  b.)
4. Drive the vehicle and speed it up at 30 km/h (19 mph) or more, and then initialize when the skid control ECU to its initial condition. (It takes about 0.5 to 1.0 hour to complete the initialization depends on.)
   NOTE: If the tire pressure warning lamp blinks at 0.25 second intervals while the vehicle is being driven, the initialization may be failed, so PERFORM the initialization again. (Turn the ignition switch OFF and retry from step  b.)
5. After initialization, the skid control ECU monitors the decrease of the tire air pressure.

1. Inspect the battery voltage.

   Battery voltage: 11 to 14 V 

   If voltage is below 11 V, recharge the battery before proceeding.

2. Check DLC3.
   Fig 5: Identifying DLC 3 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   The vehicle's skid control ECU uses ISO 9141-2 for communication. The terminal arrangement of DLC3 complies with SAE J1962 and matches with the ISO 9141-2 format.

   Verify conditions listed in table below:

   TERMINALS CONNECTION & CONDITION
   
   

   Terminal No.	Connection / Voltage or Resistance	Condition
   7	Bus + Line / Pulse generation	During transmission
   4	Chassis Ground to Body Ground / 1 Ω or less	Always
   16	Battery Positive to Body Ground / 9 to 14 V	Always

• 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.

Fig 6: Checking Warning Lamp

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Turn the ignition switch OFF.
2. With the ignition switch ON, the lamp should illuminate for 3 seconds and then go out.

1. Make sure the ignition switch is OFF.
2. Using the SST, connect the terminals TS and CG of DLC3.

   SST 09843-18040

3. Turn the ignition switch ON (The mode switches to TEST mode).
   Fig 7: Identifying DLC 3 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Press the tire pressure warning switch is ON.
5. Check that the tire pressure warning lamp comes on.
   NOTE:

   • Unless the above operation including (d) is Performed, the tire pressure warning lamp remains off while TEST mode.
   • When the tire pressure warning system has any problem, the tire pressure warning lamp blinks at 0.5 second interval.
   Fig 8: Pressing Tire Pressure Warning Switch & Inspecting Tire Pressure Warning System
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   If the indicator check result is not normal, proceed to the problem symptoms table or TS terminal circuit.

   ITEM REFERENCE
   
   

   Item	See
   Problem Symptoms Table	PROBLEM SYMPTOMS TABLE
   TS Terminal Circuit (w/o VSC)	TC TERMINAL CIRCUIT
   TS Terminal Circuit (w/ VSC)	TC TERMINAL CIRCUIT

6. Turn the ignition switch OFF.
7. Remove the SST from the DLC3.

   SST 09843-18040

8. Turn the ignition switch ON.
9. Check that the tire pressure warning lamp go off.
10. Initial setting of the tire pressure warning system (See step  5.).
    Fig 9: Inspecting Tire Pressure Warning Lamp

    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Connect the hand-held tester to DLC3.
Fig 10: Connecting Hand-Held Tester To DLC 3
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch ON.
3. Select the "TEST MODE", and operate it the with hand-held tester.
4. Press the tire pressure warning switch is ON.
5. Check that the tire pressure warning lamp comes on.
   NOTE:

   • Unless the above operation including (d) is Performed, the tire pressure warning lamp remains off while TEST mode.
   • When the tire pressure warning system has any problem, the tire pressure warning lamp blinks at 0.5 second interval.
   Fig 11: Pressing Tire Pressure Warning Switch & Inspecting Tire Pressure Warning System
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   If the indicator check result is not normal, proceed to the problem symptoms table or TS terminal circuit.

   ITEMS REFERENCE
   
   

   Item	See
   Problem Symptoms Table	PROBLEM SYMPTOMS TABLE
   TS Terminal Circuit (w/o VSC)	TC TERMINAL CIRCUIT
   TS Terminal Circuit (w/ VSC)	TC TERMINAL CIRCUIT

6. Turn the ignition switch OFF.
7. Turn the ignition switch ON.
8. Check that the tire pressure warning lamp goes off.
9. Initial setting of the tire pressure warning system (See step  5).
   Fig 12: Inspecting Tire Pressure Warning Lamp

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Checking DTCs.
   1. Using the SST, connect terminals TC and CG of DLC3.
      Fig 13: Identifying DLC 3 Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      SST 09843-18040

   2. Turn the ignition switch ON.
   3. Read and record any DTCs from the tire pressure warning lamp on the combination meter. Refer to the illustration on the left for examples of a normal code and codes 11 and 13.
      Fig 14: Blinking Patterns Of Normal Code & Code 11 & 13

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

      • If the tire pressure warning lamp does not blink any DTC codes or the normal code, inspect the tire pressure warning lamp circuit or TC terminal circuit.
        Fig 15: Identifying Tire Pressure Warning Lamp

        Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        TROUBLE AREA REFERENCE
        
        

        Trouble Area	See
        Tire Pressure Warning Lamp Circuit	TIRE PRESSURE WARNING LAMP CIRCUIT
        TC Terminal Circuit (w/o VSC)	TC TERMINAL CIRCUIT
        TC Terminal Circuit (w/ VSC)	TC TERMINAL CIRCUIT

      • If 2 or more malfunctions are indicated at the same time, the lowest numbered DTC is displayed first.
   4. Refer to the Diagnostic Trouble Code Chart (See DIAGNOSTIC TROUBLE CODE CHART ) for DTC information.
   5. After completing the check, remove SST from DLC3.

      SST 09843-18040

2. Clearing the DTCs.
   1. Using the SST, connect terminals TC and CG of DLC3.

      SST 09843-18040

   2. Turn the ignition switch ON.
      Fig 16: Identifying DLC 3 connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   3. Clear DTC stored in ECU by depressing the brake pedal 8 times or more within 5 sec.
   Fig 17: Depressing Brake Pedal
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Check that the tire pressure warning lamp shows the normal code.
   5. Remove SST from DLC3.

      SST 09843-18040

   NOTE: Disconnect the battery cable during the operation will not erase DTC in ECU.

1. Checking DTCs using the Hand-held tester.
   1. Connect the hand-held tester to DLC3.
   Fig 18: Connecting Hand-Held Tester To DLC 3
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Turn the ignition switch ON.
   3. Read DTCs by following the prompts on the tester screen.
   NOTE: Refer to the hand-held tester operator's manual for further details.
2. Clearing the DTCs using the Hand-held tester.
   1. Connect the hand-held tester to DLC3.
   2. Turn the ignition switch ON.
   3. Erase the DTCs following the prompts on the tester screen.
   NOTE: Refer to the hand-held tester operator's manual for further details.

1. Connect the hand-held tester to DLC3.
2. Turn the ignition switch ON.
3. Following the display on the tester, read the "DATA LIST".

w/o VSC: 

Fig 19: Tester Display Data List Table (W/O VSC)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

w/ VSC: 

Fig 20: Tester Display Data List Table (W/VSC) (1 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 21: Tester Display Data List Table (W/VSC) (2 Of 2)>

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Connect the hand-held tester to DLC3.
2. Turn the ignition switch ON.
3. Following the display on tester, PERFORM the "ACTIVE TEST".

w/o VSC: 

w/ VSC: