Toyota Tacoma manuals

Toyota Corolla Repair Manual: Mechanical system tests

1. Perform mechanical system tests

  1. Measure the stall speed.

    The object of this test is to check the overall performance of the transaxle and engine by measuring the stall speeds in the d and r positions.

Notice

:

  1.  Chock the 4 wheels.
  2.  Connect an obd ii scan tool or handheld tester to the dlc3.
  3.  Fully apply the parking brake.
  4. Keep your left foot pressed firmly on the brake pedal.
  5.  Start the engine.
  6.  Shift into the d position. Press all the way down on the accelerator pedal with your right foot.
  7. Quickly read the stall speed at this time.

    Stall speed: 2,550 150 rpm

  8.  do the same test in the r position.

    Stall speed: 2,550 150 rpm

Evaluation:

Problem

Possible cause

(A) stall speed low in d and r positions
  • Engine output may be insufficient
  • stator oneway clutch not operating properly

H

int

: if the value is less than the specified value by 600 rpm or more, the torque converter could be faulty.

(B) stall speed high in d position
  • Line pressure too low
  • forward clutch slipping
  • no. 2 Oneway clutch not operating properly
  • u/d oneway clutch not operating properly
(C) stall speed high in r position
  • Line pressure too low
  • direct clutch slipping
  • 1st and reverse brake slipping
  • u/d brake slipping
(D) stall speed high in d and r positions
  • Line pressure too low
  • improper fluid level
  • u/d oneway clutch not operating properly
  1. Measure the time lag.
  1.  When the shift lever is shifted while the engine is idling, there will be a certain time lapse or lag before the shock can be felt. This is used for checking the condition of the direct clutch, forward clutch, and 1st and reverse brake.

Notice

:

  1. Connect an obd ii scan tool or handheld tester to the dlc3.
  2.  Fully apply the parking brake.
  3.  Start the engine and check idle speed.

    Idle speed: 650 50 rpm (in n position and a/c off)

  4.  shift the shift lever from the n to d position. Using a stop watch, measure the time from when the lever is shifted until the shock is felt.
  5.  Measure the time lag of n " r in the same way.

Time lag:
n d less than 1.2 Seconds n r less than 1.5 Seconds

Evaluation (if n " d time or n " r time lag is longer than specified):

Problem

Possible cause

N d time lag is longer
  • Line pressure too low
  • forward clutch worn
  • u/d oneway clutch not operating properly
N r time lag is longer
  • Line pressure too low
  • direct clutch worn
  • 1st and reverse brake worn
  • u/d oneway clutch not operating properly
Road test
1. Problem symptom confirmation Taking into consideration the results of the customer problem analysis, try to reproduce the symptoms of the trouble. If the problem is that the transaxle does ...

Hydraulic test
1. Perform hydraulic test Measure the line pressure. Notice: Do the test at normal operation atf temperature 50 to 80 c (122 to 176 f). The line pressure test should always be carrie ...

Other materials:

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