Diagnosis System

STEERING COLUMN: STEERING LOCK SYSTEM: DIAGNOSIS SYSTEM

1. DESCRIPTION

(a) 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.

(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 BEAN.

(c) 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.









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 manual.

2. WARNING FUNCTION OF ENGINE SWITCH INDICATOR

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









3. 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.