Zkouška mezních otáček CVT

1.Set the parking brake, and block the front wheels.

2.Connect a tachometer to the engine, and start the engine.

3.Make sure the A/C switch is OFF.

4.After the engine has warmed up to normal operating temperature (the radiator fan comes on), shift to [D] position.

5.Fully press the brake pedal and accelerator for 6 to 8 seconds, and note engine speed. Do not move the shift lever while raising engine speed.

6.Allow 2 minutes for cooling, then repeat the test in [S], [L], and [R] positions.

NOTE:
  • Do not test stall speed for more than 10 seconds at a time.
  • Stall speed tests should be used for diagnostic purposes only.
  • Stall speed should be the same in [D], [S], [L], and [R] positions.
  • Do not test stall speed with the A/T pressure gauges installed.

Stall Speed rpm in [D] and [R] positions: 
Specifikace: 2500 ot/min (min-1) 
Provozní limit: 2350-2650 ot/min (min-1) 


Otáčky motoru při zablokovaných kolech a plném plynu v polohách [S] a [L]: 
Specification: 3.000 rpm (min-1) 
Provozní limit: 2800-3100 ot/min (min-1) 

7.Pokud jsou naměřené hodnoty mimo provozní limit, jsou v tabulce níže uvedeny problémy a pravděpodobné příčiny.

Problém Pravděpodobná příčina 
Vysoké otáčky STALL v polohách [D], [S], [L] a [R] 
  • Nízká hladina kapaliny nebo nízký výkon čerpadla kapaliny ATF
  • Ucpané sítko kapaliny ATF
  • PH regulator valve stuck closed
  • Slipping forward clutch
  • Faulty start clutch
 
Stall speed rpm high in [R] position 
  • Slippage of reverse clutch
  • Faulty start clutch
 
Stall speed rpm low in [D], [S], [L], and [R] positions 
  • Engine output low
  • Faulty start clutch
  • Stuck pulley control valve