2001 Toyota PriusFACTORY OEM SERVICE PROCEDURE

Engine Compression: Inspection

NOTE: If there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure.
The measurement of compression pressure should be performed in the Cranking Mode.
  1. Warm Up And Stop Engine 

    Allow the engine to warm up to normal operating temperature.

  2. Remove Air Cleaner Assembly 
  3. Remove  IGNITION COIL  .
  4. Remove Spark Plugs 
  5. Connect Toyota Hand-Held Tester 
    1. Connect the TOYOTA hand-held tester to the DLC3.
      Fig 1: Connecting TOYOTA Hand-Held Tester To DLC3 Connector
      G02810576Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Select the cranking mode on the TOYOTA hand-held tester.
    3. Please refer TOYOTA hand-held tester operator's manual for further details.
  6. Inspect Cylinder Compression Pressure 
    1. Insert a compression gauge into the spark plug hole.
    2. Fully open the throttle.
      3. NOTE: In the Cranking Mode, the engine speed is automatically controlled at 250 rpm and the throttle valve is also automatically set in fully-opened condition.
    3. While cranking the engine, measure the compression pressure.
    4. Repeat steps (a) through (c) for each cylinder.
      Fig 2: Inserting Compression Gauge Into Spark Plug Hole
      G02810577Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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