A Important Preliminary Checks

Before using this section, perform the Powertrain On-Board Diagnostic (OBD) System Check and verify all of the following conditions:
^ The ECM and the Malfunction Indicator Lamp (MIL) are operating correctly.
^ There are no DTCs stored.
^ The scan tool data is within the normal operating range. Refer to Engine Scan Tool Data List.
^ Verify the customer complaint. Then, locate the correct symptom in the table of contents. Perform the procedure which is included in the symptom table.