Sequoia 4WD V8-4.7L (2UZ-FE) (2006)
Tachometer: Testing and Inspection
Component Inspection
INSPECT TACHOMETER
a. Connect a tune-up test tachometer, and start the engine.
NOTE:
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Reversing the connection of the tachometer will damage the transistors and diodes inside.
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When removing or installing the tachometer, be careful not to drop or subject it to heavy shocks.
b. Compare the tester and tachometer indications.
Standard: DC 13.5 V 20 degrees C at (68 degrees F)
If error is excessive, replace the tachometer.