Dynamic Testing-Vehicle Running
DYNAMIC TESTING-VEHICLE RUNNINGDynamic testing is the final step in the transaxle tester usage. It allows the transaxle to be proven out electronically and hydraulically.
TRANSAXLE SOLENOID CYCLING AND DRIVE TEST PROCEDURES PRELIMINARY SET UP
1. Set the Bench/Drive switch to DRIVE mode.
2. Rotate the gear select switch on tester to the GEAR SELECT "1" position.
3. Set the vehicle in PARK.
4. Start the vehicle.
EPC SOLENOID
CAUTION: Do not attempt to keep the EPC switch depressed (minimum line pressure) and stall the transaxle (holding the vehicle with the brake while depressing the throttle with the transaxle in gear). Transaxle damage will result.
5. Observe the line pressure. Record the value. Line pressure should go to maximum. If not, refer to SYMPTOM TROUBLESHOOTING or Pinpoint test "E" concerning the EPC solenoid.
6. Depress the EPC switch. Line pressure should drop to a minimum value. Record the value. If not, refer to SYMPTOM TROUBLESHOOTING or Pinpoint Test "E".
ENGAGEMENT
NOTE: For reverse operation, the gear select switch must be in "3/R".
7. Set the Bench/Drive switch to the "DRIVE" mode.
8. Rotate the gear select switch to GEAR SELECT "1".
9. Start the vehicle, rotate the gear select switch to GEAR SELECT "3/R". Line pressure should drop to idle pressure. While holding the EPC switch down, shift the vehicle from PARK to REVERSE.
^ Does the vehicle shift into REVERSE?
NOTE: Engagement will be harsh and line pressure will be at maximum regardless of the EPC switch during reverse check.
Shift the vehicle from REVERSE to PARK.
10. Rotate the gear select switch to GEAR SELECT "1". Depress the EPC switch. Line pressure should drop to idle pressure. While holding the EPC switch down, shift the vehicle from PARK to DRIVE.
^ Does the vehicle shift into DRIVE?
^ Was the engagement smooth?
Shift the vehicle from DRIVE to PARK.
Release the EPC switch. Line pressure should return to maximum. Repeat steps 9 and 10 for engagements. With the EPC switch released, engagements should be firm.
UPSHIFT/DOWNSHIFT
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 the vehicle during these tests.
- These tests should be performed on the road. If they are performed on the hoist, the technician may not feel all of the shifts when they are engaged.
- 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 downshift.
CAUTION: Selector lever must be in the D range position or internal damage could result. Do not shift to 2 or 1 range position.
11. Verify that the gear select switch is in 1st gear position. Move the selector lever into the D range. Depress the 32 T/CCS button and accelerate the vehicle. If there is no vehicle movement, inspect the forward one-way clutch. If movement occurs, proceed to step 12 and continue diagnosis.
12. Verify that the gear select switch is in the "1" position. Move the selector shift lever into D range and accelerate to 5 km/h (15 mph). Select second gear by rotating the gear selector to "2" position.
^ Did the vehicle upshift to second gear?
^ Did the appropriate shift solenoids activate/deactivate?
13. Accelerate to 40 km/h (25 mph) and select "3" position.
^ Did the vehicle upshift to third gear?
^ Did the appropriate shift solenoids activate/deactivate?
14. Accelerate to 56-72 km/h (35-45 mph) and select "4" position.
^ Did the vehicle upshift to fourth gear?
^ Did the appropriate shift solenoids activate/deactivate?
CAUTION: The vehicle must below 56 km/h (35 mph) before selecting gear select "1" position, or the transaxle could overrun.
15. Reverse the order to downshift.
NOTE:
^ 4-3 downshift will be harsh when using the transaxle tester.
^ Does the vehicle down shift from forth gear to third gear, third gear to second gear, and second gear to 1st gear?.
^ Did the appropriate shift solenoids activate/deactivate?
TORQUE CONVERTER CLUTCH (TCC) ENGAGEMENT
NOTE: This test should be performed on the road. If it is performed on a hoist, the technician may not feel the torque converter clutch engage.
CAUTION: Do not depress the TCC switch with the transaxle in gear and the vehicle at a stop. Damage to converter clutch may result.
16. Accelerate and shift the vehicle up into third gear. Hold the speed steady and depress the TCC switch.
^ Does the converter engage?
^ Does the engine rpm drop?
^ Did the TCC solenoid activate?
3-2 TIMING/COASTING CLUTCH (3-2T/CCS)
ENGAGEMENT
NOTE: This test should be performed on the road. If it is performed on the hoist, the technician may not feel the 3-2 timing/coasting clutching disengage.
17. Accelerate and upshift the vehicle into 2nd gear. Go to closed throttle. Depress the 3-2T/CCS switch.
^ Does the 3-2 timing/coasting clutch disengage?
^ Did the 3-2T/CCS solenoid deactivate (light on)?
18. Remain at closed throttle, then release the 3-2T/CCS switch.
NOTE:
^ Coast clutch engagement at closed throttle will be harsh.
^ Does the 3-2 timing/coasting clutch engage?
^ Did the 3-2T/CCS solenoid activate (light off)?
^ Did engine braking occur when the throttle was released?
TURBINE SHAFT SPEED SENSOR FUNCTION CHECK.
NOTE: This test may be performed on the hoist or on the road.
19. Set a voltmeter to 20 volt A.C.
Connect the positive lead to the (+) TSS jack.
Connect the negative lead to the (-) TSS jack.
Slowly accelerate the vehicle and monitor voltmeter.
^ Does the voltage increase with vehicle speed?