Diagnostic Procedure

NOTE: DO NOT skip any steps in self-diagnostic tests, or incorrect diagnosis may result.

Always perform a visual inspection before attempting to diagnose engine control system problems. See VISUAL INSPECTION . Enter on-board diagnostics, and retrieve trouble codes. See ENTERING ON-BOARD DIAGNOSTICS . If trouble codes are not present and/or DRB (Diagnostic Readout Box) is used, proceed to one of following tests:

Go to TEST NS-1A (NO-START TEST-1A) in this article if a no-start condition exists or engine stalls after start-up. Perform indicated VERIFICATION TEST after repairs have been made.
Go to TEST TC-1A (TROUBLE CODE TEST-1A) in this article if a driveability problem exists and trouble codes are present. Perform indicated VERIFICATION TEST after repairs have been made.
Go to TEST NTC-1A (NO TROUBLE CODE TEST-1A) this article if a driveability problem exists and no trouble codes are present. Perform indicated VERIFICATION TEST after repairs have been made.