Power Solutions International

891 4

UnclassifiedGeneral

What This Code Means

Malfunction Indicator Lamp (MIL) ON during active fault; Closed Loop Disabled; Malfunction Indicator Lamp (MIL) ON

Possible Causes

  • •Poor harness connections
  • •Faulty sensor

Suggested Actions

  1. 1Check harness (post-control box harness, sensor side) for poor connections
  2. 2Replace sensor with known good unit and re-test

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Get a diagnosis walkthrough for 891 4 on your specific Power Solutions International unit — cited to the OEM manual, not a forum guess.

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