× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network

P0638 Diagnostic Trouble Code Discussion for June 2013

Throttle Actuator Control Range/Performance

Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Trouble Ticket Help Requests for DTC P0638
Help Request Posted
2008 Mazda 3 S 2.3L Idle fault VIN: JM1BK34428
P0638: Throttle control range/performance fault. ... response and MIL light on with P0638 and P2112. When put into gear engine will shake badly with #2 & 3 coils not firing. During testing I found the PCM not grounding the drive by wire relay(ETV). Tested the wiring from PCM to relay and is ok. Tested po...
June 21, 2013