1600

UnclassifiedCooling

What This Code Means

No RPM pulses sensed for 75 consecutive milliseconds while starter active; Cranking faults to RPM sensor loss; Starter engaged, no tooth pulses for 75 ms; While running, no tooth pulses for 75 consecutive milliseconds; Unit Overloaded or Fuel System issue; Low Fuel Pressure; Throttle Stuck Closed/near Closed; No pulse during cranking (RPM sensor); No tooth pulses sensed for 75 consecutive milliseconds while starter active; No pulse during running (RPM sensor); Loss of RPM sensor signal while running; Missing pulses during cranking (RPM sensor); Missing pulses during running (RPM sensor); Underspeed condition detected (<83.3% speed (60 Hz) or <66.6% speed (50 Hz) for 30 seconds); Unit overloaded slowing engine speed; Underspeed condition detected; Low fuel pressure detected for 1200 ms before underspeed; Throttle stuck closed or near closed; Limiting fuel to the engine, slowing it down; Overvoltage condition; Generator running at higher speed (25% over nominal rpm); High Temperature; Co

Possible Causes

  • Starter circuit issue
  • RPM sensor loss
  • RPM sensor alignment
  • Low battery
  • Unit is overloaded slowing engine speed
  • Highly inductive loads
  • Low fuel pressure starves the engine, slowing it.
  • Low fuel pressure detected for 1200 ms before underspeed condition detected.
  • The throttle is stuck closed or stuck near closed limiting the fuel to the engine, slowing it down.
  • Stuck closed must be detected for one second with underspeed to set E-Code.
  • RPM sensor issue
  • RPM sensor alignment issue
  • Low fuel pressure starving the engine
  • Throttle stuck closed or near closed
  • Overspeed generator
  • Air Flow Impeded / Flow Issue
  • low battery
  • failed motor
  • Unit Overloaded
  • Fuel System issue

Suggested Actions

  1. 1Refer to Problem 31 for RPM Sensor troubleshooting
  2. 2Check fuel supply and settings
  3. 3Test 68
  4. 4Problem 31
  5. 5Problem 3
  6. 6Check the inlet/outlet for debris.
  7. 7Check coolant sensor circuit for proper operation.

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