Dynamic Testing - Engine ON

DESCRIPTION
Dynamic testing is the final step in the transmission tester usage. It allows the transmission to be proven out electronically and hydraulically.

PRELIMINARY SET UP
1. Set BENCH/DRIVE switch to DRIVE mode.
2. Set GEAR SELECT switch to first gear position.
3. Place transmission range selector lever in PARK.
4. Start engine.

EPC SOLENOID
1. Observe line pressure. Record value. Line pressure should go to maximum. If not, refer to the Diagnosis by Symptom Routines for diagnostic tips or Pinpoint Test E concerning EPC solenoid.

CAUTION: Do not attempt to hold the EPC switch depressed (minimum line pressure) and stall the transmission (holding the vehicle with the brake while depressing the throttle with the transmission in gear), as transmission damage will result.

2. Press EPC switch. Line pressure should drop to a minimum value. Record value. If not, refer to the Diagnosis by Symptom Routines or Pinpoint Test E for the EPC solenoid.

TRANSMISSION ENGAGEMENTS
1. Verify that MODE switch is in DRIVE mode.
2. Turn GEAR SELECT dial to 1.
3. Start engine.
4. Turn GEAR SELECT dial to 3/R.
b. Shift vehicle from PARK to REVERSE.
(1) Did vehicle shift into REVERSE?
(2) Was engagement harsh?
b. Shift vehicle from REVERSE to PARK.
5. Turn GEAR SELECT dial to 1.
a. Depress EPC switch. Line pressure should drop to idle pressure.
b. While holding the EPC switch down, shift vehicle from PARK to DRIVE.
(1) Did the vehicle shift into DRIVE?
(2) Was engagement smooth?
c. Shift the vehicle from DRIVE to PARK.
d. Release EPC switch. Pressure should return to maximum.
e. With the EPC switch released, repeat step 5. Engagement should be firm.

UPSHIFTS/DOWNSHIFTS

NOTE:
- GEAR SELECT SWITCH must be in GEAR SELECT "3/R" to get Reverse Gear.
- Upshifts and Downshifts will be FIRM during this procedure.
- Pressure gauges may be removed from vehicle during these tests.
- These tests should be performed on the road. If performed on the hoist the technician may not feel all of the shifts when they are engaged.

1. LED's 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 upshift and downshifts.
2. Verify that the Gear Select Switch is in 1st position. Move the transaxle range selector lever into the D position. Depress the 3-2 T/CCS button and accelerate the vehicle. If there is no vehicle movement proceed directly to One-Way Clutch, A/T for inspection of the forward one-way clutch. If movement occurs proceed to step 3 and continue diagnosis.

CAUTION: Transaxle range selector lever must be in the DRIVE (D) position or internal damage could result.

3. Verify that the Gear Select Switch is in 1st position. Move the transaxle range selector lever into Overdrive (O/D) and accelerate to 15 mph, select second gear by rotating the switch to second position.
- Did the vehicle upshift to second gear?
- Did the appropriate shift solenoids activate/deactivate?
4. Accelerate to 25 mph and select third gear.
- Did the vehicle upshift to third gear?
- Did the appropriate shift solenoids activate/deactivate?
5. Accelerate to 35/45 mph and select fourth gear.
- Did the vehicle upshift to fourth gear?
- Did the appropriate shift solenoids activate/deactivate?

NOTE:
- 4-3 downshifts will be harsh unless the 3-2T/CCS button is depressed during 4-3 downshift.
- The vehicle must be below 35 mph before selecting gear select "1" position, or the transaxle could overrun.

6. Reverse the order to downshift.
- Does the vehicle downshift from 4 to 3, 3 to 2, and 2 to 1?
- Did the appropriate shift solenoids activate/deactivate?

TORQUE CONVERTER CLUTCH (TCC) ENGAGEMENT

NOTE: This test should be performed on the road. If performed on a hoist the technician may not feel the torque converter clutch engage.

CAUTION: Do not depress TCC switch with transaxle in gear and the vehicle at a stop. Damage to torque converter clutch may result.

1. Accelerate and shift vehicle up into third gear. Hold speed steady and depress the TCC switch.
- Does the torque converter engage?
- Does the engine rpm drop?
- Did the TCC solenoid activate?
2. Release the TCC switch.
- Did the TCC solenoid deactivate?
- Did the TCC release?
- Did the RPM increase?

3-2 TIMING/COAST CLUTCH ENGAGEMENT

NOTE: This test should be performed on the road. If performed on the hoist the technician may not feel the 3-2 timing/coast clutch disengage.

1. Accelerate and upshift the vehicle into third gear. Go to closed throttle, depress the 3-2T/CCS switch.
- Does the coast clutch disengage?
- Did the 3-2T/CCS solenoid deactivate (light on)?
2. Press lightly on the throttle, then release 3-2T/CCS switch.
- Does the coast clutch engage?
- Did engine braking occur?
- Did the 3-2T/CCS solenoid activate (light off)?

TURBINE SHAFT SPEED (TSS) SENSOR FUNCTION CHECK

NOTE: This test may be performed on the hoist or on the road.

1. Set voltmeter to 20 volts A.C. Connect voltmeter positive lead to the (+) TSS jack. Connect voltmeter negative lead to the (-) TSS jack.
2. Slowly accelerate vehicle and monitor voltmeter.
- Does the voltage increase with an increase in vehicle speed?
3. After you finish testing. Continue disconnecting Tester if TR/MLP testing is not required. If TR/MLP testing is required, continue.