Retrieving DTCS

Turn ignition off. Connect Tech 1 scan tool to DLC and retrieve DTCs. Repair DTCs in order they appear. See 4WAL FAULT CODES table for diagnosis. If no fault codes are present, see 4WAL SYMPTOM DIAGNOSIS table.

The scan tool has 5 modes to assist in diagnosing 4WAL system. After selecting 4WAL from the select system menu, scan tool will automatically display SELECT MODE menu. From this menu, one of the 5 test modes can be selected by pressing appropriate key. The 5 test modes are:

• MODE FO: DATA LIST This mode allows continuous monitoring of 4WAL parameters. Scan tool displays data parameters in pairs. The parameters and its values will be displayed. The scan tool can be programmed to display specific pairs of parameters by following the screen commands, allowing you to monitor specific values that are not normally displayed together.
• MODE F1: FUNCTION TEST This mode allows actuation of 4WAL system. Scan tool sends a signal to the EBCM that causes it to cycle the system. For a short period, the EBCM will cycle the valve and activate the pump motor.
• MODE F2: DTCS This mode allows access and clearing DTCs. The screen will display the DTC and a brief description of what it represents.
• MODE F3: SNAPSHOT This mode helps isolate an intermittent condition. You can specify a trigger condition or manually trap the data. The scan tool captures and stores data before and after the trigger. Snapshot mode is divided into 3 phases; setup, data capture and data display.
• MODE F4: MISC. TESTS This mode allows researching the PROM ID to see which version of software is used in the EBTCM, history data, history codes, and tire size calibration.