Diagnosis System
- CHECK DLC3
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.
DLC3 TERMINALS CONDITION CHECKSymbols (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 CANH (6) - CANL (14) HIGH-level CAN bus line Ignition switch OFF 54 to 69 Ω CANH (6) - Body ground HIGH-level CAN bus line Ignition switch OFF 1 MΩ or higher CANH (6) - CG (4) HIGH-level CAN bus line Ignition switch OFF 1 MΩ or higher CANL (14) - Body ground LOW-level CAN bus line Ignition switch OFF 1 MΩ or higher CANH (6) - CG (4) LOW-level CAN bus line Ignition switch OFF 1 MΩ or higher 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 (with CAN VIM) 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.
- DIAGNOSIS SYSTEM
- Warning light
- The tire pressure warning light blinks when there is a malfunction in the tire pressure warning system.NOTE: When the malfunction has been corrected, the tire pressure warning light does not turn on.
- The tire pressure warning light blinks when there is a malfunction in the tire pressure warning system.
- DTCs (Normal mode)
- DTCs are memorized in the tire pressure warning 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 ).
- Test mode
- By switching from normal mode to test mode (input signal check), you can inspect the tire pressure monitor receiver, each tire pressure warning valve and transmitter and vehicle speed sensor (see REGISTRATION ).
- Warning light
- CHECK TIRE PRESSURE WARNING LIGHT
- Turn the ignition switch ON.
- Check that the tire pressure warning light turns on for 3 seconds.
If the warning check result is not normal, proceed to the troubleshooting for the tire pressure warning light circuit.
TIRE PRESSURE WARNING LIGHT TIMING CHARTTrouble Area See page Tire pressure warning light circuit TIRE PRESSURE WARNING LIGHT CIRCUIT
- TIRE PRESSURE WARNING LIGHT CHART
HINT:
The table below indicates the state of the tire pressure warning light after the ignition switch is turned ON.
TIRE PRESSURE WARNING LIGHT CONDITIONImmediately after turning the ignition switch ON Always Warning light output pattern Turns on for 3 seconds Turns off Turns on Flashes for 1 minute and then illuminates (*1) Blinks (*2) Blinks (*3) Output DTC Normal X X Low tire pressure X X System fail X X Test mode X X ECU connector poorly connected X X TC ground (DTC is output) X X TC ground (DTC is not output) X X *1: Turns on and turns off repeatedly at 0.5 second intervals.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
*2: Turns on and turns off repeatedly at 0.125 second intervals.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
*3: Turns on and turns off repeatedly at 0.25 second intervals.