Road Testing Vehicle
ROAD TESTING VEHICLENOTE: Always drive the vehicle in a safe manner according to driving conditions and obey all traffic laws.
NOTE: When the battery is disconnected or a new battery installed, certain transmission operating parameters may be lost. The Powertrain Control Module (PCM) must relearn these parameters. During this reaming process, you may experience slightly firm shifts, delayed, or early shifts. This operation is considered normal and will not affect the function of the transmission. Normal operation will return once these parameters are stored by the PCM.
The Shift Point Road Test and Torque Converter Clutch Operation Test provide diagnostic information on transmission shift controls and torque converter
SHIFT POINT ROAD TEST
Shift Speeds
This test verifies that the shift control system is operating correctly.
1. Bring engine and transmission up to normal operating temperature.
2. Operate the vehicle with the selector lever in the DS position.
3. Apply minimum throttle and observe the speeds at which upshift occurs and torque converter engages. Refer to the following Shift Speeds chart.
4. Stop the vehicle. Select the D4 position. Repeat Step
3. The transmission will make all upshifts except 4-5 and torque converter clutch should apply above 46 km/h (27 mph).
5. Press the accelerator pedal to the floor, Wide Open Throttle (WOT). The 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 the transmission range selector lever from D4 position to first position and release the accelerator pedal. The transmission should immediately downshift to third gear. When vehicle speed drops below 32 km/h (20 mph), the 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 for possible causes.
Caution: Always obey local traffic laws. Do not exceed posted limits.
TORQUE CONVERTER OPERATION TEST
This test verifies that the torque converter clutch control system and the torque converter are operating correctly.
1. Carry out the Quick Test. Check for DTCs. Refer to the Diagnostic Trouble Code Charts. 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 D5 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. The engine rpm should increase when brake pedal is tapped, and decrease about five seconds after pedal is released. If this does not occur, see Torque Converter Operation Concerns, Diagnosis by Symptom.
6. If the vehicle stalls in D5 or manual 2 at idle with vehicle at a stop, move the transmission range selector lever to manual 1 position. If the vehicle stalls, see Torque Converter Operation Concerns, Diagnosis by Symptom. Repair as necessary. If the vehicle does not stall in D5, refer to Diagnosis by Symptom. 5R55N