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DTC P1550 Knock Sensor Evaluation Ic: DTC Detecting Condition

DTC DETECTING CONDITION AND POSSIBLE CAUSES

Item Detecting Condition Possible Cause
Case 1 DTC Strategy
  • Circuit continuity check, pulse test
  • Poor connection
  • Open or short in control circuit
  • Knock sensor
  • ECM/PCM
Threshold Value
  • Integrator value difference (End value - Start value) < 4V
Case 2 DTC Strategy
  • Circuit continuity check, zero test
Threshold Value
  • Integrator gradient > 200 V/sec
Case 3 DTC Strategy
  • Parity check
Threshold Value
  • Number of parity errors > 5
Diagnostic Time
  • Continuous
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