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

WARNING: This page is about a different car, the 2004 Ford RV Cutaway, 2004 Ford Econoline, 2004 Ford E450 Super Duty, and 2004 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

DIAGNOSTIC ROUTINE - TRANSMISSION FAILURE MODE EFFECTS MANAGEMENT CHART

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. Refer to the appropriate INTRODUCTION article for diagnosis and testing of the PCM.
	Go To PINPOINT TEST B: TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR , Go To PINPOINT TEST C: TRANSMISSION RANGE (TR) POSITION SENSOR and Go To PINPOINT TEST D: TURBINE SHAFT SPEED (TSS), INTERMEDIATE SHAFT SPEED, AND OUTPUT SHAFT SPEED (OSS) SENSORS .
	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.