638
UnclassifiedGeneral
What This Code Means
MIL light on; Engine shut down
Possible Causes
- •Circuit voltage anomaly between throttle connector signal terminal and engine ground
- •Damage, corrosion, or contamination on throttle wire harness connector terminals
- •Faulty ECM
- •Foreign object in throttle bore
- •Lack of continuity between throttle connector signal ground and ECM signal ground circuit terminals
- •Throttle command is 20% less than actual throttle position for 200ms or longer
Suggested Actions
- 1Inspect the throttle wire harness connector terminals for damage, corrosion or contamination
- 2Perform On-Board (OBD) System Check
- 3Remove foreign object from throttle bore
- 4Repair circuit as necessary (refer to Wiring Repairs in Engine Electrical)
- 5Replace ECM
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Get a diagnosis walkthrough for 638 on your specific Power Solutions, Inc. unit — cited to the OEM manual, not a forum guess.
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