Transmission Drive Cycle Test

Transmission Drive Cycle Test





NOTE: If equipped, turn the Power Take-Off (PTO) unit off for correct test results. For a description of PTO (Power Take-Off) operation, refer to Transmission Electronic Control System Transmission Electronic Control System.

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

NOTE: Follow the Transmission Drive Cycle Test exactly. Malfunctions must occur 4 times consecutively for the shift error DTC to set. Torque converter failures must occur 5 times consecutively for a continuous DTC to 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 clear the self-test DTCs.

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 6th gear. Hold the vehicle speed and throttle position steady for a minimum of 15 seconds.

5. With the transmission in 6th gear and a steady vehicle speed and throttle position, lightly apply and release the brake pedal enough to operate the stop lamps. Hold the vehicle speed and throttle position 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 the self-test and record the 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 OBD (On-Board Diagnostic) procedures are completed, repair all DTCs.

Always repair all non-transmission related DTCs first, then repair any transmission related DTCs. Refer to Diagnostic Trouble Code (DTC) Charts for information on condition and symptoms. This chart is helpful in referring to the correct manual(s) and to aid in diagnosing internal transmission concerns and external non-transmission inputs. Use the pinpoint tests to diagnosis transmission electrical concerns. Make sure the vehicle wiring harness and the PCM are diagnosed as well. Computers and Control Systems Information aids in diagnosing non-transmission related electronic components.

Before Pinpoint Tests

NOTE: Prior to starting pinpoint tests, check the PCM wiring harness for correct connections, bent or broken terminals, 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 On-Board Diagnostic (OBD) test, refer to Diagnostic Trouble Code (DTC) Charts for the appropriate procedure. Prior to starting pinpoint tests, refer to any TSBs for transmission concerns.