Time Lag Test
WARNING: This page is about a different car, the 2002 Toyota ECHO, 2002 Toyota Celica, 2001 Toyota ECHO, and 2001 Toyota Celica. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
Perform this test at normal operating fluid temperature of 122-176°F (50-80°C). Allow one minute between tests. Record 3 measurements and average results.
- If selector lever is actuated with engine idling, a time lag will be noted before shock can be felt. This test is used for checking condition of No. 2 one-way clutch, forward clutch, reverse clutch and 1st/reverse brake.
- Apply parking brake. Connect scan tool to DLC3 to monitor engine RPM. Start engine. Ensure idle speed is 700-800 RPM on Celica or 650-750 RPM on ECHO, with transaxle in Neutral and A/C off. Shift transaxle from Neutral into Drive. Use a stop watch to measure elapsed time between shifting lever until shock is felt.
- Standard time lag is less than 1.2 seconds. Repeat test to measure time lag for Neutral to Reverse. Standard time lag is less than 1.5 seconds. If Neutral to Drive time lag is longer than specified, line pressure is too low, forward clutch may be worn or No. 2 one-way clutch is not operating properly.
- If Neutral to Reverse position time lag is longer than specified, reverse clutch may be worn, 1st/reverse brake may be worn or line pressure is too low.