VALVE GP-CHECK 4372890 - Caterpillar

The ignition system may cause an electrical shock hazard, which may cause personal injury or death. Avoid contacting the ignition system components and the ignition system wiring during operation.
Use the electronic service tool in order to perform the "ARD Ignition Test".Note: The ARD Ignition Test cannot be performed if the DPF soot loading is above 80%. When the DPF soot loading is above 80%, use the electronic service tool to perform a Manual DPF Regeneration.Results:
The "ARD Ignition Test" was successful and no codes were logged. - Return the unit to service.STOP
The "ARD Ignition Test" was not successful and a 3556-7 diagnostic code was logged. - Proceed to Test Step 2.
The "ARD Ignition Test" was not