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History/Intermittent DTCS

  1. Intermittent failures may be caused by problems with electrical circuit. If a visual inspection does not locate problem, vehicle may be driven with a DVOM attached to suspect circuit. Abnormal voltage or resistance readings when problem occurs indicates problem is within that circuit.
  2. To check for possible loss of DTC memory, disconnect headlight connector and idle engine until SERVICE VEHICLE SOON indicator illuminates. Several DTCs should be set and stored in memory when ignition is turned to OFF position. If DTCs are not set as specified, BFC is faulty.
  3. If SERVICE VEHICLE SOON indicator is illuminated and no DTC is stored, check for an ignition coil shorted to ground and arcing at ignition wires. Also check for poor ground connections at BFC and instrument cluster.
  4. Check for electrical system interference (sharp electrical surge) caused by a faulty relay, PCM-driven solenoid or switch. This problem will normally occur when faulty component is operated.
  5. Check for improper installation of aftermarket electrical equipment (cellular phones, etc.). Ensure Ignition Control Module (ICM) wiring is kept away from generator. Check for open diode in A/C compressor clutch.
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