For 1990-2009 cars only
Clearing History Codes: To prevent any future misdiagnosis, all history DTCs should be cleared after diagnosing a system problem.
Disconnecting the battery or module connectors will not clear a history DTC. A DTC can only be cleared by using one of the following methods:
| • | A Scan Tool . |
| • | The On-Board Service Diagnostic (OBSD). |
| • | A module will clear a history DTC after 50 ignition cycles. |
Most of the diagnostic tables refer to the Scan Tool for diagnostic support.
