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

Possible Component	Reference/Action
247 - ROUTINE
Powertrain Control System
PCM (gasoline engines), Transmission Control Module (TCM) (diesel engines), vehicle wiring harnesses, transmission internal harness, Shift Solenoid Pressure Control A (SSPCA), Shift Solenoid Pressure Control C (SSPCC), Shift Solenoid Pressure Control D (SSPCD), Torque Converter Clutch (TCC) solenoid(s), Turbine Shaft Speed (TSS)/intermediate shaft speed sensors, Transmission Fluid Temperature (TFT) sensor, Power Take-Off (PTO) input	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 A , GO to PINPOINT TEST B and GO to PINPOINT TEST D . For diesel engines, GO to PINPOINT TEST F , GO to PINPOINT TEST G and GO to PINPOINT TEST I . Repair as necessary. Clear the DTCs, road test and rerun OBD test.
Transmission Fluid
Incorrect level	Check transmission fluid level and adjust as necessary. Refer to PRELIMINARY INSPECTION .
Condition	Carry out Transmission Fluid Condition Check. Refer to PRELIMINARY INSPECTION .
Incorrect Line Pressures
High pressures	Check pressure at line tap. Carry out Line Pressure Test. Refer to SPECIAL TESTING PROCEDURES . Follow the pressure diagnosis test as required.
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.
SSPCA , SSPCC , SSPCD , 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 One-Way Clutch (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 CONTAMINATION INSPECTION . If the torque converter fails to pass the criteria for replacement or is damaged, install a new or remanufactured torque converter.