Diagnosis System
- DESCRIPTION
- DIAGNOSTIC SYSTEM
When troubleshooting a vehicle with a diagnostic system, the only difference from the usual troubleshooting procedure is connecting the Techstream to the vehicle and reading various data output from the vehicle's steering lock ECU.
The steering lock ECU records DTCs when the computer detects a malfunction in the computer itself or in its circuits.
To check the DTCs, connect the Techstream to the DLC3 on the vehicle. The Techstream enables the DTCs to be cleared, the indicators to be activated, and the DATA LIST to be checked.
- The diagnosis information of the steering lock ECU is transmitted to the Techstream via the certification ECU as the steering lock ECU is not connected to BEAN.
- Check the DLC3.
The certification ECU follows ISO 9141-2 for its communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.
Symbols (Terminals No.) Terminal Description Condition Specified Condition SIL (7) - SG (5) Bus "+" line During communication 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 positive Always 11 to 14 V HINT:
If the display shows a communication error message after connecting the Techstream cable to the DLC3 and turning the engine switch on (IG), there is a problem with either the vehicle or Techstream.
- If communication is normal when connecting the Techstream to another vehicle, inspect the DLC3 on the original vehicle.
- If communication is still not possible when connecting the Techstream to another vehicle, the problem is probably on the Techstream itself. Consult the Service Department listed in the Techstream's operator's information.
- DIAGNOSTIC SYSTEM
- WARNING FUNCTION OF ENGINE SWITCH INDICATOR
- The steering lock ECU blinks the LED indicator of the engine switch when any of the following problems occurs in the system:
Detection Item Indicator Light Blink Pattern Indication Status Countermeasure Steering lock is still not released - Blinks green at 1-second intervals
- Goes off 15 seconds after blinking starts
The motor operates to release the steering lock, but the steering lock cannot be released (e.g. the lock bar is stuck in the steering column). Push the engine switch while turning the steering wheel left or right. Malfunction in push start system - Blinks amber at 2-second intervals
- Goes off 15 seconds after the engine switch is turned off while blinking
- There is a short in the devices activating the motor.
- There is a problem in the steering lock ECU or power source control ECU.
Troubleshoot by following "HOW TO PROCEED WITH TROUBLESHOOTING". Refer to HOW TO PROCEED WITH TROUBLESHOOTING .
- The steering lock ECU blinks the LED indicator of the engine switch when any of the following problems occurs in the system:
- WARNING FUNCTION OF COMBINATION METER
- The steering lock ECU displays a warning on the combination meter when any of the following problems occurs in the system.
Detection Item Display Indication Status Countermeasure Steering lock is still not released "S/T is not Unlocked" - Goes off 15 seconds after blinking starts
The motor operates to release the steering lock, but the steering lock cannot be released (e.g. the lock bar is stuck in the steering column). Push the engine switch while turning the steering wheel left or right. Malfunction in push start system "Check S/T Lock" - Goes off 15 seconds after the engine switch is turned off while blinking
- There is a short in the devices activating the motor.
- There is a problem in the steering lock ECU or power source control ECU.
Troubleshoot by following "HOW TO PROCEED WITH TROUBLESHOOTING". Refer to HOW TO PROCEED WITH TROUBLESHOOTING .
- The steering lock ECU displays a warning on the combination meter when any of the following problems occurs in the system.