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 Symptom Related Diagnostic Procedures
or Pinpoint Test E for the 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 Symptom Related Diagnostic Procedures
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. Depress EPC switch. Line pressure should drop to idle pressure. While holding EPC switch down, shift transmission range selector lever from PARK to REVERSE.
- Did vehicle shift into REVERSE?
- Was engagement smooth? Shift from REVERSE to PARK.
5. Depress EPC switch. Line pressure should drop to idle pressure. While holding the EPC switch down, shift vehicle from PARK to DRIVE.
- Did vehicle shift into DRIVE?
- Was engagement smooth?
6. Shift vehicle from DRIVE to PARK. Release EPC switch. Pressure should return to maximum.
7. With the EPC switch released, repeat Steps 4 and 5, engagements should be firm.

UPSHIFTS/DOWNSHIFTS

NOTE:
- Upshifts and downshifts will be firm during this procedure.
- Pressure gauges may be removed.
- These tests should be performed on the road. If performed on the hoist, the technician may not feel all shifts when engaged.
- LEDs will turn green when shift 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.

1. Shift vehicle into OVERDRIVE and accelerate to 24 km/h (15 mph), select second gear by rotating GEAR SELECT switch to second gear position.
- Did vehicle upshift to second gear?
- Did appropriate shift solenoids activate/deactivate?
2. Accelerate to 40 km/h (25 mph) and select third gear position.
- Did vehicle upshift to third gear?
- Did appropriate shift solenoids activate/deactivate?
3. Accelerate to 56-72 km/h (35/45 mph) and select fourth gear position.
- Did vehicle upshift to fourth gear?
- Did appropriate shift solenoids activate/deactivate?
4. Reverse the order to downshift.
- Does vehicle downshift from fourth to third, third to second, and second to first?
- Did appropriate shift solenoids activate/deactivate?

TORQUE CONVERTER CLUTCH (TCC) ENGAGEMENT
1. Accelerate and shift vehicle up into third gear. Hold speed steady and press the MCCC switch.

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

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

- Does the torque converter engage?
- Does the engine rpm drop?
- Did torque converter clutch solenoid (TCC solenoid) activate?

OUTPUT SHAFT SPEED (OSS) SENSOR FUNCTION CHECK
1. Connect voltmeter positive lead to the (+) OSS jack.

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

1. Set voltmeter to 20 volts AC.
2. Connect voltmeter negative lead to the (-) OSS jack.
3. Slowly accelerate vehicle and monitor voltmeter.
4. Does voltage increase with vehicle speed?
5. After you finish testing, continue to Transmission Tester Removal and Clearing DTCs if TR/MLP testing is not required. Proceed to TR/MLP testing if required.