Power Solutions International

127

UnclassifiedAir Intake

What This Code Means

MIL (Malfunction Indicator Light) ON; Adaptive disabled during active fault; Damaged or melted MAP sensor; Intake backfire (>= 4 events); Intake backfires (4 or more events); MIL ON

Possible Causes

  • •Improper fuel-air mixtures
  • •Worn ignition components
  • •Improper valve lash settings
  • •Engine timing issues
  • •Bad sensors

Suggested Actions

  1. 1Capture ALL fault code history in MASTER and SLAVE ECMs
  2. 2Download ALL fault code flight data recorders from MASTER and SLAVE ECMs
  3. 3Download ALL fault snapshot from MASTER and SLAVE ECMs
  4. 4Download Backfire Histogram from MASTER and SLAVE ECMs
  5. 5Inspect spark plugs for water ingress/corrosion from the top side (coil side)
  6. 6Inspect ignition coil wire harness (closely looking at pin conditions)
  7. 7Capture ALL fault code history in MASTER and SLAVE ECM’s
  8. 8Download ALL fault code flight data recorders from MASTER and SLAVE ECM’s
  9. 9Download ALL fault snapshot from MASTER and SLAVE ECM’s
  10. 10Download Backfire Histogram from MASTER and SLAVE ECM’s (located on Service page)
  11. 11Verify Spark Plug Resistance Value is between 3.5 to 7 kOhm
  12. 12Verify Crank Position Sensor gap and shim as needed

Related Power Solutions International Fault Codes

129148123154122157 4121160 3118161 4117 4187
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