Power Solutions International

DTC 643

UnclassifiedElectrical

What This Code Means

DST displays MAP voltage less than the limit defined in calibration with the engine idling

Possible Causes

  • •Poor connection at sensor
  • •Faulty MAP sensor
  • •Intermittent Problem

Suggested Actions

  1. 1Perform the On-Board (OBD) System Check
  2. 2Troubleshoot DTC 642 or DTC 643 first if present
  3. 3Using a DMM, measure the voltage potential across 5ref1 and 5V rtn1 at connector to check if >4.7 VDC
  4. 4Jumper the MAP circuit to Vref (5 VDC) in connector on harness and check if DST displays MAP voltage of 4.7 VDC or greater
  5. 5Key off, disconnect wire harness header from ECM, carefully remove yellow lock from header at device output terminal, and check resistance between MAP input at ECM header and signal at device (ensuring no probe or object is inserted into terminals to prevent spreading pins)

Related Power Solutions International Fault Codes

DTC 642DTC 562DTC 160 2DTC 154DTC 122DTC 118DTC 113DTC 107891030112122643
Browse all Power Solutions International fault codes

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