Power Solutions International

DTC 327

UnclassifiedGeneral

What This Code Means

MIL (Malfunction Indicator Light) ON during active fault; Engine shutdown; DTC 327 resets during engine operation

Possible Causes

  • •Knock sensor 1 signal is lower than expected for low load operation
  • •Knock sensor input voltage is less than 0.001V for 3 seconds while MAP is below 10 psia
  • •Intermittent problem
  • •Faulty harness (open circuit)
  • •Faulty harness (ground short)
  • •Knock wiring in harness not properly twisted
  • •Faulty knock sensor
  • •Faulty ECM

Suggested Actions

  1. 1Perform the On-Board (OBD) System Check
  2. 2Operate engine at the minimum RPM and MAP defined in diagnostic calibration to see if DTC 327 resets
  3. 3Disconnect knock sensor from wire harness
  4. 4Disconnect wire harness header from ECM, carefully remove yellow lock from header at device output terminal, and check resistance between Knock 1 (+) output at ECM header and knock sensor connector (resistance should be < 5.0 ohms)
  5. 5Check resistance between Knock 1 (+) and ground and 5Vrtn1 (Analog Return)
  6. 6Inspect knock wiring in harness to verify if wiring is properly twisted
  7. 7Replace knock sensor and retest
  8. 8Replace ECM
  9. 9Repair or replace faulty harness

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DTC 336DTC 342DTC 326DTC 355DTC 302 4DTC 522DTC 299DTC 563DTC 238DTC 606DTC 237DTC 685
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