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 ?
  • 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.Start the engine.
4.Fully depress the brake pedal.
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.
 Malfunction of valve body [C1 pressure control solenoid (SL1) hydraulic system]
Slippage of the C1 clutch
Malfunction of F1 one-way clutch
Malfunction of oil pump
Restricted oil strainer
N to R time lag is longer than the standard value.
 Malfunction of valve body [C3 pressure control solenoid (SL3) hydraulic system]
Slippage of the C3 clutch
Slippage of the B2 brake
Malfunction of oil pump
Restricted oil strainer