How to Read Provisional Diagnostic Trouble Codes

DIAGNOSTIC FUNCTION

HOW TO READ PROVISIONAL DIAGNOSTIC TROUBLE CODES

Required Special Tools:

- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991910: Main Harness A

If detecting the malfunction during the first drive cycle, the ECM [M/T] or PCM [A/T] temporarily stores the diagnosis code as the provisional diagnosis code. If detecting the same malfunction during the next drive cycle, the ECM [M/T] or PCM [A/T] determines that the malfunction exists. The ECM [M/T] or PCM [A/T] outputs the diagnosis code. On Scan Tool MB991958, it is possible to display the stored provisional diagnosis code which the ECM [M/T] or PCM [A/T] had detected during the first drive cycle. This makes it possible to confirm in one drive cycle whether the malfunction could happen again after the repair.