SYMPTOM DIAGNOSIS
Symptom checks cannot be used properly unless the problem occurs while the vehicle is being tested. To reduce diagnostic time, ensure steps in BASIC DIAGNOSTIC PROCEDURES and SELF-DIAGNOSTICS articles were performed before diagnosing a symptom. Symptoms available for diagnosis include
- «Difficult To Start»(ref-3004-S09683405862000041700000)
- «Rough Or Unstable Idle»(ref-3004-S39985613302000041700000)
- «Engine Hesitates Or Misses»(ref-3004-S35118160602000041700000)
- «Poor Fuel Mileage»(ref-3004-S01122342762000041700000)
- «Engine Will Not Start»(ref-3004-S27833163652000041700000)
- «Engine Starts But Stops»(ref-3004-S19129000532000041700000)
- «Poor Response On Acceleration»(ref-3004-S09433258542000041700000)
- «Lack Of Power»(ref-3004-S40239438782000041700000)
INTERMITTENT PROBLEM DIAGNOSIS
Intermittent fault testing requires duplicating circuit or component failure to identify problem. These procedures may lead to computer setting a fault code (on some systems) which may help in diagnosis.
If problem vehicle does not produce fault codes, monitor voltage or resistance with a DVOM while attempting to reproduce conditions causing intermittent fault. A status change on DVOM indicates a fault has been located.
Use a DVOM to pinpoint faults. When monitoring voltage, make sure that ignition is on or engine is running. Turn ignition off or disconnect negative battery cable when monitoring circuit resistance. Status changes on DVOM during test procedures indicate area of fault.