Diagnosis System

STEERING COLUMN: STEERING LOCK SYSTEM: DIAGNOSIS SYSTEM

1. DESCRIPTION

(a) 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 ECU detects a malfunction in the ECU itself or in its circuits.

To check the DTCs, connect the Techstream to the DLC3 on the vehicle. The Techstream enables clearing the DTCs, activating indicators and checking the data list.

(b) 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 the BEAN.

2. CHECK DLC3

(a) The certification ECU follows the ISO 9141-2 as its communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.









(a) 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 Techstream to the DLC3, turn the power switch ON (IG) and attempt to use the Techstream. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the Techstream.

* If communication is normal when the Techstream is connected to another vehicle, inspect the DLC3 of the original vehicle.
* If communication is still not possible when the Techstream is connected to another vehicle, the problem may be in the Techstream itself. Consult the Service Department listed in the Techstream's instruction manual.
3. WARNING FUNCTION OF POWER SWITCH INDICATOR

(a) The steering lock ECU blinks the LED indicator of the power switch when any of the following problems occurs in the system.









4. WARNING FUNCTION OF COMBINATION METER

(a) The steering lock ECU displays a warning on the combination meter when any of the following problems occurs in the system.