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

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: The pressure switches listed in this routine will not be applicable to all vehicle applications. Some vehicles will not have the pressure switches installed in the valve body.

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, transmission pressure switches PS-A, PS-B, PS-C, PS-D, PS-E, (if equipped) TSS/intermediate shaft speed sensor, OSS sensor, TR-P sensor, TFT sensor, TCIL, tow/haul switch, TSPC driver circuit.	Carry out on-board diagnostic tests. See INTRODUCTION - GASOLINE article or INTRODUCTION -- 6.0L DIESEL article for diagnosis and testing of the PCM.
	GO to PINPOINT TEST B , GO to PINPOINT TEST C , GO to PINPOINT TEST D and GO to PINPOINT TEST E .
	Repair as required. Clear DTCs, road test and rerun on-board diagnostic test.
	Refer to Routine 212.
The transmission FMEM serves three purposes: Prevents invalid combinations of applied clutches that cause tie-ups Isolates a potential fault down to a specific pressure switch, solenoid, or clutch Limits gears of operation based on the failure after the fault had been isolated	When failures occur the customer may complain of erratic shifting or transmission hanging in gear. This is normal for the FMEM strategy. Determine which gears are being commanded, and which gears are being avoided, and this will in turn point to a specific pressure switch, solenoid, or clutch fault.