4F50N (AX4N) Automatic Transaxle

Transaxle Drive Cycle Test

NOTE: Always drive the vehicle in a safe manner according to driving conditions and obey all traffic laws.

After carrying out the Quick Test, use the following Transaxle Drive Cycle Test for checking continuous codes:

NOTE: The Transaxle Drive Cycle Test must be followed exactly. Malfunctions must occur four times consecutively for shift error DTC code to be set, and five times consecutively for continuous torque converter clutch code to set.

NOTE: When carrying out the Transaxle Drive Cycle Test, see the solenoid operation chart for correct solenoid operation. For additional information, refer to Pinpoint Tests-Non OSC Equipped Vehicles.
Pinpoint Tests-Non OSC Equipped Vehicles

1. Record and then erase Quick Test codes.
2. Warm engine to normal operating temperature.
3. Make sure transmission fluid level is correct.
4. With transaxle in OVERDRIVE, moderately accelerate from stop to 80 km/h (50 mph). This allows the transaxle to shift into fourth gear. Hold speed and throttle opening steady for minimum of 15 seconds.
5. With transaxle in fourth gear and maintaining steady speed and throttle opening, lightly apply and release brake (to operate stoplamps). Then hold speed and throttle steady for additional five seconds minimum.
6. Brake to a stop and remain stopped for minimum of 20 seconds.
7. Repeat Steps 4 through 6 at least five times.
8. Carry out Quick Test and record continuous codes.
- If DTCs are present, refer to Diagnostic Trouble Code Charts. Service all non-transaxle DTCs first as they can directly affect the operation of the transaxle. Repeat the Quick Test and Road Test to verify the correction. Erase DTCs, carry out drive cycle, and repeat the Quick Test after completing service on the DTCs.
- If the continuous test passes (system pass) and a concern is still present, refer to Diagnosis By Symptom and TSBs for diagnostic concern. 4F50N (AX4N) Automatic Transaxle

After On-Board Diagnostics

NOTE: The vehicle wiring harness, powertrain control module and non-transaxle sensors may affect transaxle operations. Service these concerns first.

After the On-Board Diagnostic procedures are completed, service all DTCs.
Begin with non-transaxle related DTCs, then service any transaxle related DTCs. Refer to the Diagnostic Trouble Code Charts for information on Condition and Symptoms. This chart will be helpful in diagnosing internal transaxle concerns and external non-transaxle inputs. The pinpoint tests are used in diagnosing electrical concerns of the transaxle. Make sure that the vehicle wiring harness and the powertrain control module are diagnosed as well. The diagnostic routine hydraulic/mechanical charts will help in diagnosing internal transaxle concerns and external non-transaxle inputs.

Before Pinpoint Tests

NOTE: Prior to entering pinpoint tests, check the powertrain control module (PCM) wiring harness for correct connections, bent or broken pins, corrosion, loose wires, correct routing, correct seals and their condition. Check the PCM, sensors and actuators for damage.

NOTE: If a concern still exists after electrical diagnosis has been carried out, refer to Diagnosis By Symptom.

If DTCs appear while carrying out the on-board diagnostics. For additional information, refer to the Diagnostic Trouble Code Charts for the appropriate repair procedure. Prior to entering pinpoint tests, refer to any TSBs for transaxle concerns.