Power Solutions International

118

UnclassifiedElectrical

What This Code Means

DST displays ECT voltage greater than limit set in calibration; Malfunction Indicator Lamp (MIL) ON during active fault; Adaptive features disabled; ECM uses a default value for the ECT sensor

Possible Causes

  • •Intermittent Problem
  • •Open ECT ground (5Vrtn1) circuit
  • •Faulty connection to sensor
  • •Faulty ECT sensor
  • •Faulty ECM connection
  • •Faulty ECM
  • •Faulty Harness
  • •ECT sensor voltage exceeds 4.950 volts while engine is running

Suggested Actions

  1. 1Perform On-Board (OBD) System Check.
  2. 2With Key ON, Engine Off, and System Mode set to 'Stopped', check if DST displays ECT voltage greater than the limit set in calibration.
  3. 3Disconnect ECT sensor from harness, jumper across terminals at connector, and check if DST displays ECT voltage of 0.1 or less.
  4. 4With Key Off, disconnect wire harness header from ECM, carefully remove yellow lock from header at device output terminal, and check if resistance between MAP input at ECM header and signal at device is less than 5 ohms (do not insert probe directly into terminals to avoid spreading pins).

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