Diagnosis System

1. The ECM uses ISO 15765-4 for communication. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.
   Fig 1: Identifying DLC3 Connector Terminals

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   DLC3 CONNECTOR TERMINALS SPECIFIED CONDITION
   
   

   Symbols (Terminals No.)	Terminal Description	Condition	Specified Condition
   SIL (7) - SG (5)	Bus '+' line	During transmission	Pulse generation
   CG (4) - Body ground	Chassis ground	Always	Below 1 Ω
   SG (5) - Body ground	Signal ground	Always	Below 1 Ω
   BAT (16) - Body ground	Battery ground	Always	11 to 14 V

   If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.

   HINT:

   Connect the cable of the intelligent tester to the DLC3, turn the ignition switch ON and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem wither with the vehicle or with the tester.

   • 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, so consult the Service Department listed in the tester's instruction manual.

1. Warning light
   1. The tire pressure warning light blinks when there is any malfunction in the tire pressure warning system.
      NOTE: When the malfunction has been corrected, the tire pressure warning light does not come on.
2. DTCs (Normal mode)
   1. DTCs are memorized in the tire pressure monitor ECU. These DTCs can be read by checking the blinks of the tire pressure warning light or by using the intelligent tester (see DTC CHECK/CLEAR  ).
3. Test mode
   1. By switching from normal mode to test mode (input signal check), you can inspect the tire pressure monitor receiver assembly, each tire pressure monitor valve sub-assembly and vehicle speed sensor (see TEST MODE PROCEDURE  ).
      Fig 2: Locating Tire Pressure Warning Light

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1. Turn the ignition switch ON.
2. Check that the tire pressure warning light comes on for 3 seconds.

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

   TROUBLESHOOTING REFERENCE
   
   

   Trouble Area	Reference
   Tire pressure warning light circuit	TIRE PRESSURE WARNING LIGHT CIRCUIT

HINT:

The TIRE PRESSURE WARNING LIGHT TABLE  indicates the state of the tire pressure warning light after the ignition switch is turned ON.

Fig 3: Locating Tire Pressure Warning Light

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*1: Comes on and goes off repeatedly at 0.5 second intervals.

Fig 4: Tire Pressure Warning Light Blinking Pattern (1 Of 3)

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*2: Comes on and goes off repeatedly at 0.125 second intervals.

Fig 5: Tire Pressure Warning Light Blinking Pattern (2 Of 3)

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*3: Blinks 3 times (1 second on, 1 second off).

Fig 6: Tire Pressure Warning Light Blinking Pattern (3 Of 3)

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