Dynamic Testing - Engine ON

DESCRIPTION
Dynamic testing allows the transmission to be proven out electronically and hydraulically.

PRELIMINARY SETUP
1. Set the bench/drive switch to DRIVE mode.
2. Rotate the gear select switch to GEAR SELECT " 1', position.
3. Place the vehicle in PARK.
4. Start the engine.

EPC SOLENOID FUNCTIONAL TEST
1. Observe line pressure. Record value. Line pressure should go to maximum. If not, refer to the Diagnosis by Symptom Index for diagnostic tips. Also, refer to Pinpoint Test E for electronic pressure control solenoid diagnosis.
2. Press electronic pressure control switch. Line pressure should drop to a minimum value. Record value. If line pressure does not drop to a minimum value, refer to the Diagnosis by Symptom Index or Pinpoint Test E for the electronic pressure control solenoid.

CAUTION: Do not attempt to hold the electronic pressure control switch depressed (minimum line pressure) and stall the transmission (holding the vehicle with the brake while pressing the throttle with the transmission in gear). Transmission damage will result.

TRANSMISSION ENGAGEMENTS
1. Verify that the MODE switch is in DRIVE mode.
2. Turn the GEAR SELECT dial to 1.
3. Start the engine.
4. Shift the vehicle from PARK to REVERSE.
- Did the vehicle shift into REVERSE?
- Was the engagement firm?

5. Depress the EPC switch. Line pressure should drop to idle pressure. While holding the EPC switch down, shift vehicle from PARK to REVERSE.
- Did the vehicle shift into REVERSE?
- Was the engagement smooth?
- Shift the vehicle from REVERSE to PARK.
- Release the EPC switch. Line pressure should rise to MAX pressure.

6. Shift the vehicle from PARK to DRIVE.
- Did the vehicle shift into DRIVE?
- Was the engagement firm?

7. Shift the vehicle from DRIVE to PARK.
8. Press the EPC switch. Pressure should drop to idle pressure.
9. While holding the EPC switch down, shift the vehicle from PARK to DRIVE.
- Did the vehicle shift from PARK to DRIVE?
- Was the engagement smooth?

10. Release the EPC switch.

UPSHIFTS/DOWNSHIFTS
1. Move the transmission range selector lever into OVERDRIVE and accelerate to 24 km/h (15 mph). Select second gear by rotating the gear selector to SECOND.
- Did the vehicle upshift to second gear?
- Did the appropriate shift solenoids activate/deactivate?

NOTE:
- Upshifts and downshifts will be firm during this procedure. Pressure gauges can be removed. These tests should be performed on the road. If performed on the hoist, shift perception may not be possible.
- LEDs will turn GREEN when solenoids are activated and turn off when deactivated. Refer to the appropriate overlay for the proper status shift sequence of the shift solenoids during upshifts and downshifts.

2. Accelerate to 40 km/in (25 mph) and select third gear.
- Did the vehicle upshift to third gear?
- Did the appropriate shift solenoids activate/deactivate?

3. Accelerate to 56-72 km/h (35-45 mph) and select fourth gear.
- Did the vehicle upshift to fourth gear?
- Did the appropriate shift solenoids activate/deactivate?

4. Reverse the order to downshift.
- Does the vehicle downshift from fourth to third, third to second, and second to first?
- Did the appropriate shift solenoids activate/deactivate?

5. Does the transmission pass these tests? If not, refer to Diagnosis by Symptom. Symptom Related Diagnostic Procedures

TORQUE CONVERTER CLUTCH (TCC) ENGAGEMENT
1. Accelerate and shift the vehicle up into third gear. Hold speed steady and press the torque converter clutch solenoid switch.
- Does the torque converter clutch engage?
- Does the engine rpm drop?
- Did the torque converter clutch solenoid activate?

CAUTION: Do not press torque converter clutch solenoid switch with transmission in gear and the vehicle at a stop. Damage to torque converter clutch can result.

NOTE: Perform this test on the road. If performed on a hoist, feeling the torque converter clutch engage may not be possible.

2. Holding speed steady, release the switch.
- Does the torque converter clutch disengage?
- Does the rpm rise?
- Does the TCC solenoid deactivate?

3. Does the transmission pass these tests? If not, refer to Diagnosis by Symptom. Symptom Related Diagnostic Procedures

COAST CLUTCH ENGAGEMENT
1. Accelerate and shift vehicle up into third gear. Press the coast clutch solenoid switch and immediately back off the throttle.
- Did the coast clutch engage? Did engine braking occur?
- Did the coast clutch solenoid activate?

NOTE: Perform this test on the road. If performed on the hoist, the technician may not feel the coast clutch engage.

2. Release the CCS switch.
- Does the CCS solenoid deactivate?
- Does the coast clutch disengage?
- Does the transmission pass these tests? If not, refer to Diagnosis by Symptom. Symptom Related Diagnostic Procedures