Shift Concerns: Harsh 3-4 Shift Only (Automatic)

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

SHIFT CONCERNS: HARSH 3-4 SHIFT ONLY (AUTOMATIC)

Possible Component	Reference/Action
234 - ELECTRICAL ROUTINE
Powertrain Control System	-
Electrical inputs/outputs, vehicle wiring harnesses, powertrain control module, EPC Solenoid, 3-2T/CCS, transmission range (TR) sensor, transmission fluid temperature (TFT) sensor, TSS, throttle position sensor, mass air flow sensor, TCC solenoid	Run On-Board Diagnostics Tests. Refer to INTRODUCTION - GASOLINE . GO to PINPOINT TEST B , GO to PINPOINT TEST C , GO to PINPOINT TEST D , GO to PINPOINT TEST E , GO to PINPOINT TEST F and GO to PINPOINT TEST G .
334 - HYDRAULIC/MECHANICAL ROUTINE
Main Control	-
Bolts out of torque specification	Adjust bolts to specification.
Gasket leaks	Inspect for damage. Repair as necessary.
Line modulator valve (also 1-2 and 2-3 harsh shift), 3-2 control valve, 2-4 accumulator valve, coast clutch valve, stuck, damaged or misassembled	Inspect for damage. Repair as necessary.
Hydraulic passages damaged	Inspect for damage. Repair as necessary.
Separator plates damaged, blocked	Inspect for damage. Repair as necessary.
Pump Assembly	-
Bolts out of torque specification	Adjust bolts to specification.
Gaskets damaged	Inspect for damage. Repair as necessary.
Porosity/cross leaks	Inspect for damage. Repair as necessary.
Coast clutch Teflon® seals damaged	Inspect for damage. Repair as necessary.
Intermediate/Overdrive Band and Servo Assembly	-
Intermediate overdrive band and reverse clutch drum assembly, damaged, worn, misassembled	Inspect for damage. Repair as necessary.
Servo piston or cover damaged or leaking	Inspect for damage. Repair as necessary.
Springs damaged	Inspect for damage. Repair as necessary.
Coast Clutch Assembly	-
Piston or seals damaged, missing	Inspect for damage. Repair as necessary.
Friction elements damaged, worn	Inspect for damage. Repair as necessary.
Check ball not functioning	Inspect for damage. Repair as necessary.
Direct Clutch Assembly	-
-	Carry out Air Pressure Test.
Piston or seals damaged, missing	Inspect for damage. Repair as necessary.
Check ball damaged, missing or leaking	Inspect for damage. Repair as necessary.
Return spring damaged	Inspect for damage. Repair as necessary.
Friction elements damaged	Inspect for damage. Repair as necessary.
Clutch cylinder splines damaged	Inspect for damage. Repair as necessary.
Case	-
Band anchor damaged	Inspect for damage. Repair as necessary.