Harsh 5-3 Coast Downshift in Tow Haul Mode or to Manual Third

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DIAGNOSTIC ROUTINES - HARSH 5-3 COAST DOWNSHIFT IN TOW HAUL MODE OR TO MANUAL THIRD

Possible Component	Reference/Action
247 - ROUTINE
Powertrain Control System
PCM, vehicle wiring harnesses, transmission internal harness, shift pressure control solenoids, SSPC-A, SSPC-C, SSPC-D, TCC solenoid(s), TSS/Intermediate shaft speed sensors, TFT sensor, PTO input	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 A , GO to PINPOINT TEST B and GO to PINPOINT TEST D .
	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.
	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.
SSPC-A, SSPC-C, SSPC-D, TCC solenoid(s) damaged, stuck or bore damaged; manual valve damaged, stuck or bore damaged	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.
Direct 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.
Intermediate 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.
Torque Converter
Internal failure	Remove the transmission. Inspect for damage. Refer to TORQUE CONVERTER in the General Procedures portion of this article. If the torque converter fails to pass the criteria for replacement or is damaged, install a new or remanufactured torque converter.