Road Test - Performance Evaluation

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

The Shift Point Road Test and Torque Converter Clutch Operation Test provide diagnostic information on transmission shift controls and torque converter operation.

SHIFT POINT ROAD TEST
This test verifies that the shift control system is operating properly.
1. Bring engine and transmission up to normal operating temperature.
2. Operate vehicle with transmission selector in D range.

Shift Speeds Chart:

3. Apply minimum throttle and observe speeds at which upshift occurs and torque converter engages. Refer to the Shift Speeds chart.
4. Stop the vehicle. Depress Transmission Control Switch (TCS) to activate D range. Repeat Step 3 Transmission will make all upshifts except 4-5 and torque converter clutch apply should occur above 46 km/h (27 mph).
5. Press accelerator pedal to floor, Wide Open Throttle (WOT). Transmission should shift from third to second, or third to first, depending on vehicle speed, and torque converter clutch should release.
6. With vehicle speed above 48 km/h (30 mph), move transmission range selector lever from D range to 1 range (LOW) and release accelerator pedal. Transmission should immediately downshift to third gear. When vehicle speed drops below 32km/h (20 mph), transmission should downshift into first gear.
7. If transmission fails to upshift/downshift or torque converter clutch does not apply release, refer to Diagnosis by Symptom Index for possible causes.

TORQUE CONVERTER OPERATION TEST
This test verifies that the torque converter clutch control system and the torque converter are operating properly.
1. Perform Quick Test. Check for DTCs. Testing and Inspection
2. Connect a tachometer to the engine.
3. Bring the engine to normal operating temperature by driving the vehicle at highway speeds for approximately 15 minutes in (D) position.
4. After normal operating temperature is reached, maintain a constant vehicle speed of about 80 km/h (50 mph) and tap brake pedal with the left foot.
5. Engine rpm should increase when brake pedal is tapped, and decrease about five seconds after pedal is released. If this does not occur, refer to Torque Converter Operation Concerns in the Diagnosis by Symptom Index.
6. If the vehicle stalls in (D) or manual 2 at idle with vehicle at a stop, move the transmission range selector lever to manual 1 position. If the vehicle stalls, refer to Torque Converter Operation Concerns in the Diagnosis by Symptom. Repair as required If the vehicle does not stall in (D), refer to Diagnosis by Symptom. Symptom Related Diagnostic Procedures