Engine Compression Inspection
NOTE:
After the inspection, you must reset the powertrain control module (PCM) Otherwise, the PCM will continue to stop the fuel injectors from operating
- Warm up the engine to normal operating temperature (cooling fan comes on)
- Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
- Connect the Honda Diagnostic System (HDS) to the data link connector (DLC) (see step 2 on GENERAL TROUBLESHOOTING INFORMATION )
- Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
- Make sure the HDS communicates with the vehicle and the PCM If it does not communicate, troubleshoot the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING )
- Select ALL INJECTORS STOP in the PGM-FI INSPECTION menu with the HDS
- Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
- Remove the six ignition coils (see IGNITION COIL REMOVAL/INSTALLATION )
- Remove the six spark plugs
- Attach the compression gauge to a spark plug hole
- Step on the accelerator pedal to open the throttle fully, then crank the engine with the starter motor, and measure the compression
Compression Pressure
Above 932 kPa (9.5 kgf/cm 2 , 135 psi)
- Measure the compression on the remaining cylinders
Maximum Variation.
Within 200 kPa (2.0 kgf/cm 2 , 28 psi)
- If the compression is not within specifications, check the following items, then remeasure the compression
- Incorrect valve clearance
- Confirmation of cam timing
- Damaged or worn cam lobes
- Damaged or worn valves and seats
- Damaged cylinder head gaskets
- Damaged or worn piston rings
- Damaged or worn piston and cylinder bore
- Remove the compression gauge from the spark plug hole
- Install the six spark plugs
- Install the six ignition coils (see IGNITION COIL REMOVAL/INSTALLATION )
- Select PCM reset (see ECM/PCM RESET ) in the PGM-FI INSPECTION menu to cancel ALL INJECTORS STOP with the HDS