Diagnostic Routine 212/312 - Shift Concerns: Timing - Erratic/Hunting

WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.

SHIFT CONCERNS: TIMING - ERRATIC/HUNTING

Possible Component	Reference/Action
212 - ELECTRICAL ROUTINE
Powertrain Control System
	Carry out shift point road test. Refer to SHIFT POINT ROAD TEST and carry out torque converter operation test. Refer to TORQUE CONVERTER DIAGNOSIS .
Electrical Inputs/Outputs, Vehicle Wiring Harnesses, Powertrain Control Module (PCM), TCC and Shift Solenoids (SSA, SSB, SSC), TP, OSS, ECT, IAT, MAF, TR, TFT Sensors, Internal Wire Harness.	Run On-Board Diagnostic. Refer to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE for diagnosis. Go To PINPOINT TEST A: SHIFT SOLENOID , Go To Go To PINPOINT TEST C: TORQUE CONVERTER CLUTCH (TCC) SOLENOID , Go To PINPOINT TEST D: DIGITAL TRANSMISSION RANGE (TR) SENSOR or Go To PINPOINT TEST F: TURBINE SHAFT SPEED (TSS) SENSOR Refer to PINPOINT TESTS - NON OSC EQUIPPED VEHICLES .
312 - HYDRAULIC/MECHANICAL ROUTINE
Fluid
Incorrect level	Adjust fluid to correct level.
Condition	Inspect. Repair as required.
Shift Linkage (Internal/External)
Damaged, out of adjustment	Inspect. Repair as required. Verify linkage adjustment. Refer to SELECTOR LEVER CABLE ADJUSTMENT . After adjusting the linkage, verify that the digital TR sensor is correctly adjusted. Refer to TRANSMISSION RANGE (TR) SENSOR ADJUSTMENT .
Main Control Valve Body
Bolts out of torque specification	Tighten bolts to specification.
Gaskets and Separator Plate - damaged, off location	Inspect for damage. Install new as required.
Valves, Accumulators, Seals, Clips, Check Ball - stuck, damaged, contaminated	Inspect for damage. Repair as required.
Vehicle Speed Input
Insufficient, erratic or no input received by the PCM from the OSS sensor.	Inspect. Repair as required. Go To PINPOINT TEST G: OUTPUT SHAFT SPEED (OSS) SENSOR .
Torque Converter Clutch
	Refer to Torque Converter Cycling (ROUTINE 242/342 ).
Front Support, Driven Sprocket
Seals - damaged	Inspect for damage. Install new as required.
Holes - blocked	Inspect for damage. Repair as required.
Planetary Gear Sets
Damaged	Inspect for damage. Repair as required.
One-Way Clutch Assembly
Damaged	Inspect for damage. Repair as required.
Other components, clutches	Inspect for damage. Repair as required.
Output Shaft (differential)	Inspect for damage. Repair as required.
Overdrive Band	Inspect for damage. Repair as required.
Powerflow Components	Inspect for damage. Repair as required.
Fluid Filter and Seal Assembly
Plugged, missing	Inspect for damage. Repair as required.
Apply and Release Fluid Tubes
Damaged, missing	Inspect for damage. Repair as required.
Seal or O-ring - damaged	Inspect for damage. Install new as required.
For Diagnosis Related to a Specific Shift
	See the appropriate routine for further diagnosis:
Shift Concern: No 1-2	ROUTINE 220/320
Shift Concern: No 2-3	ROUTINE 221/321
Shift Concern: No 3-4	ROUTINE 222/322
Shift Concern: No 4-3	ROUTINE 223/323
Shift Concern: No 3-2	ROUTINE 224/324
Shift Concern: No 2-1	ROUTINE 225/325
Shift Concern: Soft/Slip 1-2	ROUTINE 226/326
Shift Concern: Soft/Slip 2-3	ROUTINE 227/327
Shift Concern: Soft/Slip 3-4	ROUTINE 228/328
Shift Concern: Soft/Slip 4-3	ROUTINE 229/329
Shift Concern: Soft/Slip 3-2	ROUTINE 230/330
Shift Concern: Soft/Slip 2-1	ROUTINE 231/331
Shift Concern: Harsh 1-2	ROUTINE 232/332
Shift Concern: Harsh 2-3	ROUTINE 233/333
Shift Concern: Harsh 3-4	ROUTINE 234/334
Shift Concern: Harsh 4-3	ROUTINE 235/335
Shift Concern: Harsh 3-2	ROUTINE 236/336
Shift Concern: Harsh 2-1	ROUTINE 237/337