Engine Compression Inspection: Inspection
How to use this Service Information .
NOTE:
After this inspection, you must reset the PCM - Refer to: PCM Reset . Otherwise, the PCM will continue to stop the injectors from operating.
- Engine Compression - Inspect
■ Preconditions
- Engine Warmed Up
- HDS Connected
■ Procedure/Specifications
1. Select the following menu buttons on the HDS screen in sequence.
- PGM-FI (System Selection Menu)
- Function Test
- ALL INJECTORS STOP
2. Attach a compression gauge to the spark plug hole.
3. Step on the accelerator pedal to open the throttle fully, then crank the engine with the starter motor, and measure the compression.
Normal Conditions (Compression Pressure)
Specifications Above 930 kPa (9.48 kgf/cm2, 134.8 psi) 4. Measure the compression on the remaining cylinders.
Normal Conditions (Maximum Variation)
Specifications Within 200 kPa (2.04 kgf/cm 2, 29.0 psi) Result
- If the measurement is not within specifications, perform a cylinder leak down test to determine the problem area. Then check the following items, and remeasure the compression:
- Incorrect valve clearance - Refer to: Valve Clearance Adjustment
- Confirmation of camshaft timing
- Damaged or worn cam lobes
- Damaged or worn valves and seats
- Damaged cylinder head gasket
- Damaged or worn piston rings - Refer to: Piston, Ring, Pin, and Connecting Rod Inspection
- Damaged or worn piston and cylinder bore - Refer to: Block and Piston Inspection
■ After Inspection
1. Select PCM reset - Refer to:PCM Reset
to cancel ALL INJECTORS STOP with the HDS.