Preliminary Inspection
- Check all vacuum hoses for correct routing, restrictions, cuts or other damage. Inspect difficult-to-see vacuum hoses beneath air cleaner assembly and other engine components.
- Inspect all engine compartment wiring for proper connections. Also check wires for pinched or chafed spots, as well as contact with sharp edges or exhaust manifolds.
- The preliminary inspection is very important and should be performed carefully and thoroughly, as it can often fix a problem without requiring further diagnosis.
NOTE:
Begin all diagnosis with appropriate ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK chart. After any DEC/electronically-controlled transmission systems repair, repeat On-Board Diagnostic (OBD) system check.