Power Solutions, Inc.

637

UnclassifiedGeneral

What This Code Means

Throttle unable to open; TPS voltage less than 2.0 volts with throttle command at 63%-68%

Possible Causes

  • •Damage, corrosion, or contamination on throttle connector terminals
  • •Faulty ECM
  • •Faulty throttle
  • •Foreign object in throttle bore
  • •Intermittent problem
  • •Lack of continuity between throttle connector TPS 1 signal terminal and ECM TPS 1 signal terminal
  • •Short to ground (continuity between throttle connector TPS 1 signal and engine ground)
  • •Throttle command is 20% or more than actual throttle position

Suggested Actions

  1. 1Perform On-Board (OBD) System Check
  2. 2Remove foreign object from throttle bore
  3. 3Repair grounded TPS 1 signal circuit between throttle connector and engine ground
  4. 4Repair open circuit between throttle connector TPS 1 signal terminal and ECM TPS 1 signal terminal
  5. 5Repair throttle connector terminals/circuit as necessary (refer to Wiring Repairs in Engine Electrical)
  6. 6Replace ECM
  7. 7Replace throttle

Related Power Solutions, Inc. Fault Codes

638651636653635DTC 112556DTC 122555DTC 244516DTC 512
Browse all Power Solutions, Inc. fault codes

ASK RUDY ABOUT THIS FAULT

Get a diagnosis walkthrough for 637 on your specific Power Solutions, Inc. unit — cited to the OEM manual, not a forum guess.

GET THE ANSWER

Free account required — we'll bring your question with you.