Harsh 6-5 Coast Downshift with overdrive OFF

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 - HARSH 6-5 COAST DOWNSHIFT WITH OVERDRIVE OFF

Possible Component	Reference/Action
246 - ROUTINE
Powertrain Control System
PCM, vehicle wiring harnesses, transmission internal harness, transmission pressure control solenoid SSPC-C, SSPC-D, TCC solenoid, TSS/Intermediate shaft speed sensor, OSS sensor, TFT sensor	Carry out on-board diagnostic tests. Refer to the appropriate INTRODUCTION article for diagnosis and testing of the PCM.
	Go To PINPOINT TEST A: CONTROL SOLENOIDS , Go To PINPOINT TEST B: TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR and Go To PINPOINT TEST D: TURBINE SHAFT SPEED (TSS), INTERMEDIATE SHAFT SPEED, AND OUTPUT SHAFT SPEED (OSS) SENSORS .
	Repair as necessary. Clear DTCs, road test and rerun on-board diagnostic test.
Fluid
Condition	Carry out Fluid Condition Check. Refer to PRELIMINARY INSPECTION .
Incorrect Pressures
High pressures	Check pressure at line tap.
High pressures	Carry out Line Pressure Test. Refer to SPECIAL TESTING PROCEDURES .
Solenoid Body Assembly
Bolts not tightened to specification	Tighten to specification.
Filter gasket damaged	Inspect for damage. If damaged, install a new filter gasket.
Contamination	Disassemble and clean.
Contamination	If damaged or parts are missing, install a new solenoid body assembly. If misassembled, reassemble correctly.
SSPC-C, SSPC-D TCC solenoid(s) damaged, stuck or bore damaged; manual valve damaged, stuck or bore damaged	Disassemble and clean.
	If damaged or parts are missing, install a new solenoid body assembly. If misassembled, reassemble correctly.
Coast Clutch Assembly
Seals, piston damaged	Inspect for damage. Repair as necessary.
Friction elements damaged or worn	Inspect for damage. Repair as necessary.
Return springs damaged	Inspect for damage. Repair as necessary.
Overdrive Clutch Assembly
Seals, piston damaged	Inspect for damage. Repair as necessary.
Filtered orifice damaged, missing, not seating, off location	Inspect for mislocation, poor seating, damage. Install a new center support if damaged.
Friction elements damaged or worn	Inspect for damage. Repair as necessary.
Return springs damaged	Inspect for damage. Repair as necessary.
Snap ring for OWC and/or return spring not seated or damaged	Inspect for damage. Repair as necessary.