Overhaul - CD4E: Diagnosis Ford Probe II

PRELIMINARY INSPECTION

1. Ensure vehicle is thoroughly road tested to verify driver's complaint. Determine if problem occurs during upshift, downshift, coasting or engagement. If noise is diagnosed, check if noise is affected by RPM, vehicle speed, gear selection or temperature. Ensure vehicle is at normal operating temperature when checking.
2. Inspect fluid level and condition. Visually inspect for vehicle modifications, electronic add-ons, fluid leaks and/or incorrect linkage adjustment. Check for trouble codes before any mechanical repair is performed. See appropriate ELECTRONIC CONTROLS article for trouble code diagnosis and repair procedures. If no trouble codes are present, see applicable symptom diagnosis.
3. If the following symptoms are present, it is necessary to complete electronic diagnosis and repair before any mechanical diagnosis and repair is performed. See appropriate ELECTRONIC CONTROLS article for trouble code diagnosis and repair procedures. No Reverse Harsh Engagement All Or Some Shifts Not Present Early, Late, Erratic, Soft, Slipping And/Or Harsh Shifting No First Gear (In "D" Position). No Low Gear. No Torque Converter Clutch Torque Converter Clutch Always Engaged Poor Vehicle Performance Engine Will Not Crank Transaxle Overheating No Engine Braking In Low ("L") No Engine Braking In Second ("2")

Test Procedure

Connect pressure gauge to the line pressure test port. (Схема №8) Start engine. Apply service and parking brakes. Check pressure in all gears. See LINE PRESSURE SPECIFICATIONS (PSI). If line pressure is not within specification, perform appropriate electronic Diagnostic and Pinpoint test. See AUTO TRANS DIAGNOSIS - CD4E article. If no electronic faults are present, perform air pressure checks and service valve body. See AIR PRESSURE CHECK.

STALL SPEED TEST

Note. After each test, shift transaxle into Neutral and run engine for at least 15 seconds to cool torque converter and transmission fluid.

The stall speed test checks the operation of the following items

1. Converter One-Way Clutch
2. Forward Clutch
3. Low One-Way Clutch
4. Reverse Clutch
5. Low-Intermediate Band
6. Engine Performance

1. Apply service and parking brakes. Connect tachometer to engine, and record RPM reached in each gear selector range (except Neutral) at WOT. Stall speed should be 2200-2500 RPM. If stall speeds exceed specification, ensure engine is mechanically okay and tuned to specification. If engine is okay, remove torque converter and check torque converter one-way clutch for slippage.
2. If stall speed is too high in "D", "2", "1", the following components may be faulty: Forward Clutch Forward One-Way Clutch
3. If stall speed is too high in "R", the following components may be faulty: Low One-Way Clutch Low/Reverse Clutch Reverse Clutch

SHIFT POINT ROAD TEST

1. Ensure engine and transaxle is at normal operating temperature. Road test vehicle in "D". Apply minimum throttle and observe speeds at which upshift occurs and torque converter engages. See «VEHICLE SHIFT SPEEDS»(ref-25357-S01844917922001011700000) .

VEHICLE SHIFT SPEEDS

Inspection

Inspect case for cracks and stripped threads. Inspect gasket surfaces and mating surfaces for burrs. Check vent for obstructions, and check all fluid passages for obstructions and leakage. Inspect case bushing for scores. Check all parking linkage parts for wear or damage.