INITIALIZATION
Note. This system requires initializing after changing tires or wheels, or after rotating the tires. Be sure to adjust the tire air pressure to the specified value before initialization.
Scheme 23
- INITIALIZING THE TIRE PRESSURE WARNING SYSTEM Check and adjust the tire pressure to the specified value. TIRE PRESSURE WARNING SYSTEM SPECIFICATION Specified Value Front 210 kpa (2.1 kgf/cm 2 , 30 psi) Rear 210 kDa (2.1 kaf/cm 2 , 30 psi) With the vehicle stopped, turn the ignition switch to the ON position. Press and hold the tire pressure warning reset switch until the tire pressure warning lamp blinks 3 times at 1 second intervals. HINT: If the tire pressure warning lamp does not blink, perform the initialization again, (with the ignition switch off, perform the procedure above starting at step 1 -(b).) Drive the vehicle at 19 mph (30 km/h) or more, to complete the initialization of the skid control ECU. (It takes more than one hour.) HINT: If the tire pressure warning lamp blinks at 0.25 second intervals while the vehicle is being driven, the initialization may have failed. If so, perform the initialization again. (Turn the ignition switch off and retry from step 1-(a).) After initialization is completed, the skid control ECU monitors the tire pressure by using the wheel speed sensors. To verify the system has been initialized check the length of time the tire pressure warning lamp is on after turning the ignition switch to the ON position. Not initialized: 4 sec. Initialized: 3 sec.
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- TEST MODE (USING SST CHECK WIRE) Make sure the ignition switch off. Using SST, connect terminals TS and CG of the DLC3. SST 09843-18040 Turn the ignition switch to the ON position. Press the tire pressure warning reset switch. Check that the tire pressure warning lamp comes on. HINT: Unless (d) above is done, the tire pressure warning lamp remains off while in test mode. When there is a problem with the tire pressure warning system, the tire pressure warning lamp blinks at 0.5 second intervals. If the lamp output result is not normal, proceed to the problem symptoms table or TS terminal circuit. ITEM SPECIFICATION Item See Problem symptoms table «PROBLEM SYMPTOMS TABLE»(ref-226382-S23905405672006032700000) TS and CG terminal circuit «TS AND CG TERMINAL CIRCUIT»(ref-226383-S13427882342006032700000) Turn the ignition switch off. Remove the SST from the DLC3. SST 09843-18040 Turn the ignition switch to the ON position. Check that the tire pressure warning lamp goes off. Initialize the tire pressure warning system (see «INITIALIZATION»(ref-226382-S08056826562006032700000) ).
- TEST MODE (USING THE HAND-HELD TESTER) Connect the hand-held tester to the DLC3. Turn the ignition switch to the ON position. Select "SIGNAL CHECK", and proceed checking with the hand-held tester. Press the tire pressure warning reset switch. Check that the tire pressure warning lamp comes on. HINT: Unless (d) above is done, the tire pressure warning lamp remains off while in test mode. When there is a problem with the tire pressure warning system, the tire pressure warning lamp blinks at 0.5 second intervals. If the lamp output result is not normal, proceed to the problem symptoms table (see «PROBLEM SYMPTOMS TABLE»(ref-226382-S23905405672006032700000) ). Turn the ignition switch off. Turn the ignition switch to the ON position. Check that the tire pressure warning lamp goes off. Initialize the tire pressure warning system (see «INITIALIZATION»(ref-226382-S08056826562006032700000) ).
TERMINALS OF ECU
SKID CONTROL ECU
Scheme 30
| Symbols (Terminals No.) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| TRC+(8)-TRC-(22) | G-B - Y-B | ECM communication output | Ignition switch 0N | Pulse generation |
| ENG (13)-GND1 (32) | W-L - W-B | ECM serial communication line (+) input signal | Ignition switch ON and vehicle speed 30 km/h (19 mph) or more | Pulse generation (See wave form 1) |
| D/G (13)-GND1 (32) | GR-B - W-B | Diagnosis tester communication line | Ignition switch ON | 10 to 14 V |
| EMG- (23) - GND1 (32) | W-G - W-B | ECM serial communication line (-) input signal | Ignition switch ON and engine idle speed | Pulse generation (See wave form 2) |
| STP (27) - GND1 (32) | G-Y - W-B | Stop lamp switch assy input signal | Brake pedal depressed | 10 to 14 V |
| STP (27) - GND1 (32) | G-Y-W-B | Stop lamp switch assy input signal | Brake dareeased | Below 1.5 V |
| GND1 (32) - Body ground | W-B - Body ground | Ground | Always | Below 1 ohm |
| INIT (41) - GND1 (32) | B-Y - W-B | Tire pressure warning reset switch signal | Ignition switch ON and tire pressure | Below 3 ohm |
| INIT (41) - GND1 (32) | B-Y - W-B | Tire pressure warning reset switch signal | Ignition switch ON and tire pressure warning reset switch OFF | 10 to 14 V |
ECU TERMINALS SPECIFICATION
Wave form 1
Reference
| Item | Condition |
|---|---|
| Terminal | ENG+ - GND1 |
| Tool setting | 1 V / DIV, 0.5 ms / DIV |
| Vehicle condition | Engine idle speed |
ITEM CONDITION SPECIFICATION (WAVE FORM 1)
Scheme 31
Wave form 2
Reference
| Item | Condition |
|---|---|
| Terminal | ENG- - GND1 |
| Tool setting | 1 V / DIV, 0.5 ms / DIV |
| Vehicle condition | Engine idle speed |
ITEM CONDITION SPECIFICATION (WAVE FORM 2)
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- DIAGNOSTIC SYSTEM Inspect the battery voltage. Battery voltage: 11 to 14 V If voltage is below 11 V, recharge the battery before proceeding. Check the DLC3. The vehicle's skid control ECU uses ISO 9141-2 for communication. The terminal arrangement of the DLC3 complies with SAE J1962 and matches with the ISO 9141 -2 format. Verify conditions listed in the table below: TERMINAL CONDITION Terminal No. Terminal name 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 displays "UNABLE TO CONNECT TO VEHICLE" when the cable of the hand-held tester is properly connected to the DLC3, the ignition switch is turned to the ON position and the tester is operated, there is either a problem on the vehicle side or tester side. If communication is normal when the tester is connected to another vehicle, inspect the 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. In this case, consult the Service Department listed in the tester's instruction manual.
- CHECK WARNING LAMP Turn the ignition switch to the LOCK position. When the ignition switch is turned to the ON position, the lamp should come on for 3 to 4 seconds and then go off. HINT: If the tire pressure warning lamp has a defect, check the tire pressure warning lamp output patterns and the problem symptoms table (see «PROBLEM SYMPTOMS TABLE»(ref-226382-S23905405672006032700000) ).
- TIRE PRESSURE WARNING LAMP CHART HINT: When the skid control ECU does not operate properly, the ABS warning lamp comes on as an ABS system malfunction.