NASTF Information Requests

Tracking: 457 Status: Closed - Requester Satisfied
State: PA Name: Peter
Category of Request: Driveability - Fuel, Ignition, Emission, Computer, etc. Manufacturer: 2002 FORD F350 SUPER DUTY

Inquiry
Have you checked the OEM website?
Yes
Description of Repair unable to perform
Replace PCM with correct part number PCM, but different hardware type MTC-422 or MTC-422A
Description of Information not available
The 'latest part number information' look up on the service website indicates that the PCM part number could be supported by either the hardware type MTC-422 or MTC-422A. The PCMs with these hardware types and the same part number respond differently to diagnostic requests from a scan tool for engine RPM and transmission speed sensors. Are these different hardware types equivalent regardless of the data responses or does this affect transmission shift points, tachometer outputs or communications with other modules?
Description of steps taken to obtain information (help/contact function on website, websites, etc.)
Some evaluation has been made of the different hardware type PCMs with the same part number. The data responses to the rpm and transmission speed sensor requests are different by hardware type. The MTC-422 appears to give a more accurate rpm data response than the MTC-422A hardware type PCM.
Other Comments or Concerns
There are a few other hardware types with a similar concern for different applications. The 'latest part number' lookup indicates there are two different hardware types for a PCM part number, but those hardware types do not respond the same to similar data requests from a scan tool. MTC-421 vs MTC-421A MTC-423 vs MTC-423A MLC-456 vs MLC-456A MTC-431 vs MTC-431A
Notes
- 5/21/2012
Ford modified the wording on the Latest Calibration search page to make it more clear and beneficial to its users.
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