TIME LAG TEST


The time lag test indicates the measurement of time until a shock is felt after a shift change is performed during idle from N range to D or R range. This test checks the statuses of clutch, brake, and hydraulic pressure.
1.
warning For safety, operators must not stand in front of and at the rear of the vehicle during this test.
Check the ATF temperature.

  • ATF temperature: 50 - 80 °C
  • Switches for air conditioner, lamps, and others shall be OFF.
note Use the M.U.T.-III to measure the ATF temperature.
2.Raise the vehicle.
3.Pull the parking brake lever, and then fully depress the brake pedal.
4.Start the engine.
5.
caution
  • Perform the measurement for 3 times or more, and obtain the average value of the measurements.
  • The interval of time lag test must be 1 minute or more. (To eliminate the residual pressure of clutches and brakes)
Measure the time starting from the moment a shifting is performed from N to D or R until a shock is felt.
Standard value:
N to D range: 0.7 seconds or less
N to R range: 1.2 seconds or less

TIME LAG TEST JUDGEMENT
Time lag test result
 Probable cause
N to D time lag is longer than the standard value.
  • Line pressure is low.
  • Malfunction of clutch No.1 (slip)
  • Malfunction of one-way clutch No.3
N to R time lag is longer than the standard value.
  • Line pressure is low.
  • Malfunction of clutch No.3 (slip)
  • Malfunction of brake No.4 (slip)
  • Malfunction of one-way clutch No.1