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

WARNING: This page is about a different car, the 2010 Ford Pickup, 2010 Ford F550 Super Duty, 2010 Ford F450 Super Duty, and 2010 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

DIAGNOSTIC ROUTINES - ERRATIC/HUNTING OR ERRATIC SCHEDULING

Possible Component	Reference/Action
265 - ROUTINE
Powertrain Control System
PCM (gasoline engines), Transmission Control Module (TCM) (diesel engines), vehicle wiring harnesses, transmission internal harness, Turbine Shaft Speed (TSS)/intermediate shaft speed sensor, Output Shaft Speed (OSS) sensor, Transmission Range (TR) sensor, Transmission Fluid Temperature (TFT) sensor, Transmission Control Indicator Lamp (TCIL), tow/haul switch, Transmission Solenoid Power Control driver circuit	Carry out On-Board Diagnostic (OBD) tests. Refer to the INTRODUCTION - GASOLINE MODELS for diagnosis and testing of the PCM. For gasoline engines, GO to PINPOINT TEST B , GO to PINPOINT TEST C , GO to PINPOINT TEST D and GO to PINPOINT TEST E . For diesel engines, GO to PINPOINT TEST G , GO to PINPOINT TEST H , GO to PINPOINT TEST I and GO to PINPOINT TEST J . Repair as required. Clear the DTCs, road test and rerun OBD test. Refer to Routine 212 .
The transmission Failure Mode Effects Management serves 3 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 Failure Mode Effects Management 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.