Transmission Failure Mode Effects Management (FMEM), Shift Concerns: Erratic/Hunting or Erratic Scheduling

WARNING: This page is about a different car, the 2005 Ford RV Cutaway, 2005 Ford Econoline, 2005 Ford E450 Super Duty, and 2005 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

DIAGNOSTIC ROUTINES - TRANSMISSION FAILURE MODE EFFECTS MANAGEMENT (FMEM), SHIFT CONCERNS: ERRATIC/HUNTING OR ERRATIC SCHEDULING

Possible Component	Reference/Action
265 - ROUTINE
Powertrain Control System
PCM, vehicle wiring harnesses, transmission internal harness, TSS/Intermediate shaft speed sensor, OSS sensor, TR position sensor, TFT sensor, TCIL, TCS switch, TSPC driver circuit	Carry out on-board diagnostic tests. See INTRODUCTION - GASOLINE and/or INTRODUCTION -- 6.0L DIESEL articles for diagnosis and testing of the PCM. GO to PINPOINT TEST B , GO to PINPOINT TEST C and GO to PINPOINT TEST D . Repair as required. Clear DTCs, road test and rerun on-board diagnostic test. Refer to Routine 212.
The transmission FMEM serves three purposes: prevent invalid combinations of applied clutches that cause tie-ups isolate a potential fault down to a specific pressure switch, solenoid, or clutch after the fault had been isolated, limit gears of operation based on the failure	When failures occur, the customer may complain of erratic shifting or transmission hanging in gear. This is normal for the FMEM strategy - determining which gears are being commanded, and which gears are being avoided will point to a specific pressure switch, solenoid, or clutch fault.