Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2002HIGHLANDER 4WD L4-2.4L (2AZ-FE)REPAIR AND DIAGNOSISMAINTENANCETUNE-UP AND ENGINE PERFORMANCE CHECKSCOMPRESSION CHECKTESTING AND INSPECTION
2002 Toyota Highlander 4WD L4-2.4L (2AZ-FE)
Compression Check: Testing and Inspection
2002 Toyota Highlander 4WD L4-2.4L (2AZ-FE)SECTION Testing and Inspection
INSPECT COMPRESSION
a. Warm up and stop engine.
b. Disconnect the injector connectors.
c. Remove ignition coil.
d. Remove spark plugs.
e. Inspect cylinder compression pressure.
SST 09992-00500
1. Insert a compression gauge into the spark plug hole.
2. Fully open the throttle.
3. While cranking the engine, measure the compression pressure.
Compression pressure: 1.360 MPa (13.9 kgf/cm2, 198 psi)
Minimum pressure: 0.98 MPa (10 kgf/cm2, 142 psi)
Difference between each cylinder: 100 kPa (1.0 kgf/cm2, 14 psi)
NOTICE:
- Always use a fully charged battery to obtain engine speed of 250 rpm or more.
- Check other cylinder's compression pressure in the same way.
- This measurement must be done in as short a time as possible.
4. If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole and inspect again.
HINT:
- If adding oil increases the compression, it is likely that the piston rings and/or cylinder bore are worn or damaged.
- If pressure stays low, a valve may be sticking or seating improperly, or there may be leakage past the gasket.
RENDER: 1.0x
NO RELATED
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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.