Road Testing Vehicle

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

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

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

3. Note: Shift speed ranges are approximate for all applications.








Shift Speeds 3.0L 2V





Shift Speeds 3.0L 4V

Apply minimum throttle and observe speeds at which upshift occurs and torque converter engages using the shift speeds chart.

4. Stop vehicle and move selector lever to D range. Repeat Step 3. Transaxle will make all upshifts except 3-4 and torque converter clutch apply should occur above 39 km/h (24 mph).
5. With vehicle speed above 39 km/h (24 mph), press accelerator pedal to floor, Wide-Open Throttle (WOT). Transaxle should shift from third to second, or third to first, depending on the vehicle speed. The torque converter clutch should release.
6. With vehicle speed above 48 km/h (30 mph), move the selector lever from D range to 1 range (LOW) and remove foot from accelerator pedal. Transaxle should immediately downshift to second gear. When vehicle speed drops below 24 km/h (15 mph), transaxle should downshift into first gear.
- If transaxle fails to upshift/downshift or TCC does not apply and release, refer to Diagnosis by Symptom for possible causes.

TORQUE CONVERTER DIAGNOSIS
Prior to torque converter installation, all diagnostic procedures must be followed. This is to prevent the unnecessary installation of new or remanufactured torque converters. Only after a complete diagnostic evaluation can the decision be made to install a new or remanufactured torque converter.
Begin with the normal diagnostic procedures as follows:
1. Preliminary Inspection
2. Know and Understand the Customer's Concern
3. Verify the Concern-carry out the torque converter operation test.
4. Carry out Diagnostic Procedures:
- Run on-board diagnostics.
+ Repair all non-transmission related DTCs first.
+ Repair all transmission DTCs.
+ Rerun On-Board Diagnostic to verify repair.
+ Carry out Line Pressure Test.
+ Carry out Stall Speed Test.
+ Carry out diagnostic routines.
+ Use the index to locate the appropriate routine that best describes the symptom(s). The routine will list all possible components that may cause or contribute to the symptom. Check each component listed, diagnose and repair as required, before repairing the torque converter.

Torque Converter Operation Test
This test verifies that the TCC control system and the torque converter are operating correctly.
1. Carry out Quick Test. Check for DTCs.
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 OD position.
4. After normal operating temperature is reached, maintain constant vehicle speed of about 80 km/h (50 mph) and tap the 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 see torque converter operation concerns.
6. If the vehicle stalls in OD or manual 2 at idle with vehicle at a stop, move the selector lever to manual 1 position. If the vehicle stalls see torque converter operation concerns. Repair as required. If the vehicle does not stall in D. refer to Diagnosis by Symptom. AX4N