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Engine Controls - Trouble Shooting - No Codes - Except Coupe: Diagnosis Dodge Neon II

Testing & Diagnostics ~243 words

PRELIMINARY INSPECTION

Most engine control system driveability problems result from faulty wiring, poor electrical connections, improper wire routing, or leaking air and vacuum hose connections. Inspect all engine control system components, hoses, connectors and wiring for damage before proceeding with symptom diagnosis.

SYMPTOM DIAGNOSIS

Symptom checks cannot be used properly unless problem occurs while vehicle is being tested. To reduce diagnostic time, ensure steps in appropriate BASIC DIAGNOSTIC PROCEDURES article and SELF-DIAGNOSTICS article were performed before diagnosing a symptom. Symptoms available for diagnosis are as follows

  1. «ENGINE DOES NOT CRANK»(ref-142307-S09455311542002072900000)
  2. «ENGINE DOES NOT START»(ref-142307-S10502583362002072900000)
  3. «HARD START»(ref-142307-S20370441302002072900000)
  4. «STARTS & STALLS»(ref-142307-S33752059672002072900000)
  5. «HESITATION/STUMBLE»(ref-142307-S23980719282002072900000)
  6. «SURGE»(ref-142307-S00419134882002072900000)
  7. «LACK OF POWER/SLUGGISH»(ref-142307-S35482064292002072900000)
  8. «SPARK KNOCK/DETONATION»(ref-142307-S40620845472002072900000)
  9. «CUTS OUT/MISSES»(ref-142307-S20513128202002072900000)
  10. «BACKFIRE»(ref-142307-S30045079332002072900000)
  11. «RUNS ROUGH/UNSTABLE, ERRATIC IDLE»(ref-142307-S37674574842002072900000)
  12. «POOR FUEL ECONOMY»(ref-142307-S01570051752002072900000)

INTERMITTENT PROBLEM DIAGNOSIS

Intermittent fault testing requires duplicating circuit or component failure to identify the problem. These procedures may lead to PCM setting a Diagnostic Trouble Code (DTC) which may help in diagnosis.

If problem vehicle does not produce DTC, monitor voltage or resistance values using 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, ensure ignition switch is in ON position or engine is running. Ensure ignition switch is in OFF position or negative battery cable is disconnected when monitoring circuit resistance. Status changes on DVOM during test procedures indicate area of fault.

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