Road Testing Vehicle
The following Shift Point Road Test and Torque Converter Clutch Operation Test provide diagnostic information on transmission shift controls and torque converter operation.SHIFT POINT ROAD TEST
Note: Always drive the vehicle in a safe manner according to driving conditions and obey all traffic laws.
This test verifies that the shift control system is operating properly.
1. Bring engine and transmission up to normal operating temperature.
2. Operate the vehicle with the transmission range selector lever in (D) range.
3. Apply minimum throttle and observe the speeds at which the upshift occurs and the torque converter engages.
4. With the vehicle in OVERDRIVE (fourth gear), depress the transmission control switch. The transmission should downshift to third gear. Remove foot from accelerator pedal; engine braking should occur.
5. Press accelerator pedal to floor (wide-open throttle). Transmission should shift from third to second gear or third to first, depending on vehicle speed. Torque converter clutch should disengage and then reapply.
6. With vehicle (D) range above 80 km/h (50 mph) and less than half throttle, move the transmission range selector lever from (D) range to MANUAL 2 range and remove foot from accelerator pedal. The transmission should immediately downshift into second gear. With the vehicle remaining in MANUAL 2 range, move transmission range selector lever into MANUAL 1 range. Transmission should downshift into first gear at speeds BELOW 48 - 56 km/h (30 - 35 mph).
7. If transmission fails to upshift/downshift or torque converter clutch does not apply and release, refer to Diagnosis by Symptom Index under Diagnosis by Symptom.
Applications Shift Speeds-Approximate* Km/h (MPH) (E-150, E-250, E-350 with 5.4L) (Under 8500 GVW Rating)
Note: This vehicle has been equipped with a special cold weather shift strategy. This was designed to maximize heater output. This new strategy operates under the following conditions: ambient air temperature is -4°C (25°F) or below and the engine coolant temperature at start up is 38° (100°F) or below. During this condition the vehicle may experience a slightly delayed shifts under light throttle. Medium and heavy throttle shifts will be normal. Once the engine coolant reaches 71°C (160°F) or above normal shift scheduling will resume. If during the diagnosing of a delayed shift concern and the concern goes away after the engine coolant reaches above 71°C (160°F) this is a normal operation of the special cold weather shift strategy. If this condition does not go away after the engine coolant reaches 71°C (160°F), refer to Diagnosis by Symptom.
Note: All gasoline applications have new adaptive shift strategies. Whenever the vehicles battery has been disconnected for any type of service or repairs the strategy parameters that are stored in the Keep Alive Memory (KAM) will be lost. The strategy will start to relearn once the battery is reconnected and the vehicle is driven. This is a temporary condition and will return to normal operating condition once the Powertrain Control Module (PCM) relearns all the parameters from the driving conditions. There is no time frame set for this process. If this concern is present during down shifts or converter clutch apply, it is not the shift strategy and will require diagnosis.
The customer needs to be notified that they may experience slightly different upshifts either soft or firm and that this condition is temporary and will eventually return to normal operating condition.
Applications Shift Speeds-Approximate* Km/h (MPH) (E-150, E-250, E-350 with 5.4L) (Under 8500 GVW Rating)
1 Nominal shift speed at sea level is shown. Actual shift speed will depend on tire brand, size, and axle ratio.
Applications Shift Speeds-Approximate* Km/h (MPH) (E-350, E-Series Super Duty with 6.8L)
1 Nominal shift speed at sea level is shown. Actual shift speed will depend on tire brand, size, and axle ratio.
Applications Shift Speeds-Approximate* Km/h (MPH) (E-350, E-Super Duty with 7.3L DITD)
1 Nominal shift speed at sea level is shown. Actual shift speed will depend on tire brand, size, and axle ratio.
TORQUE CONVERTER DIAGNOSIS
Prior to installing a new or remanufactured torque converter, all diagnostic procedures must be followed. This is to prevent the unnecessary installation of good torque converters. Only after a complete diagnostic evaluation can the decision be made to install a new or remanufactured torque converter.
Begin with the normal diagnostic procedures as follows:
1. Preliminary Inspection.
2. Know and Understand the Customer's Concern.
3. Verify the Concern-Carry out the Torque Converter Clutch Operation Test.
4. Carry out Diagnostic Procedures.
- Run on-board diagnostics.
+ Repair all non-transmission-related DTCs first.
+ Repair all transmission DTCs.
+ Rerun on-board diagnostics to verify repair.
- Carry out Line Pressure Test. Line Pressure Test
- Carry out Stall Speed Test. Stall Speed Test
- Carry out Diagnostic Routines. 4R100
+ Use the Diagnosis by Symptom Index to locate the appropriate routine that best describes the symptom(s). The routine will list all possible components that may cause or contribute to the symptom. Check each component listed; diagnose and repair as required, before repairing the torque converter.
Torque Converter Clutch Operation Test
This test verifies that the torque converter clutch control system and the torque converter are operating properly.
1. Carry out Quick Test. Check for DTCs.
2. Connect a tachometer to the engine.
3. Bring the engine to normal operating temperature by driving the vehicle at highway speeds for approximately 15 minutes in (D) position.
4. Note: Some applications (based on calibrations) may or may not disengage the torque converter clutch at road speeds, above 72 km/h (45 mph) when tapping on the brake. Some applications may or may not disengage the torque converter clutch at road speeds, above 72 km/h (45 mph) with closed throttle.
After normal operating temperature is reached, maintain a constant vehicle speed of about 80 km/h (50 mph) and tap brake pedal with the left foot.
5. Engine rpm should increase when brake pedal is tapped and decrease about five seconds after pedal is released. If this does not occur, refer to Diagnosis by Symptom-Torque Converter Clutch Operation Concerns.
6. If the vehicle stalls in (D) or MANUAL 2 at idle with vehicle at a stop, move the transmission range selector lever to MANUAL 1 position. If the vehicle stalls, refer to Diagnosis by Symptom-Torque Converter Clutch Operation Concerns. Repair as required. If the vehicle does not stall in (D), refer to Diagnosis by Symptom. 4R100