TorqShift

Transmission Drive Cycle Test

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

NOTE: The Transmission Drive Cycle Test must be followed exactly. Malfunctions must occur 4 times consecutively for the shift error DTC to be set. Torque Converter Clutch (TCC) failures must occur 5 times consecutively for a continuous TCC DTC to be set.

NOTE: When carrying out the Transmission Drive Cycle Test, refer to the Solenoid Operation Chart for correct solenoid operation.

After carrying out the Self Test, use the Transmission Drive Cycle Test for checking continuous codes.

1. Record and then erase the Self Test codes.

2. Warm the engine to normal operating temperature.

3. Make sure the transmission fluid level is correct.

4. With the selector lever in (D), moderately accelerate from stop to 80 km/h (50 mph). This allows the transmission to shift into 5th gear. Hold the vehicle speed and Throttle Position (TP) steady for a minimum of 15 seconds.

5. With the transmission in 5th gear and a steady vehicle speed and TP, lightly apply and release the brake pedal enough to operate the stop lamps. Hold the vehicle speed and TP steady for a minimum of 15 seconds.

6. Brake to a stop and remain stopped for a minimum of 20 seconds.

7. Repeat Steps 4 through 6 at least 5 times.

8. Carry out Self Test and record continuous codes.


After On-Board Diagnostic (OBD)

NOTE: The vehicle wiring harness, PCM and non-transmission sensors can affect transmission operations. Repair these concerns first.

After the On-Board Diagnostic (OBD) tests are complete, repair all DTCs.

Always repair all non-transmission-related DTCs first, then repair any transmission-related DTCs. Refer to the DTC Chart for information on condition and symptoms. This chart will be helpful in referring to the correct information and to aid in diagnosing internal transmission concerns and external non-transmission inputs. The pinpoint tests are used in diagnosing electrical concerns of the transmission. Make sure the vehicle wiring harness and the PCM are diagnosed as well. Computers and Control Systems Information will aid in diagnosing non-transmission-related electronic components. TorqShift Automatic Transmission


Before Pinpoint Tests

NOTE: Prior to entering pinpoint tests, check the 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. Refer to Computers and Control Systems Information.

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

If DTCs appear while carrying out the OBD tests, refer to the DTC Chart for the appropriate procedure. Prior to entering pinpoint tests, refer to any TSBs for transmission concerns. TorqShift Automatic Transmission