Engine Compression Inspection
Special Tools Required

Compression gauge attachment
 070AJ-RBD0100
NOTE: After this inspection, you must reset the engine control module (ECM), otherwise the ECM will continue to stop the injectors from functioning. Select ECM reset using the Honda Diagnostic System (HDS).
  1. Warm up the engine to normal operating temperature (cooling fan comes on).
  1. Turn the ignition switch OFF.
  1. Connect the HDS to the data link connector (DLC).
  1. Turn the ignition switch ON (II).
  1. Make sure the HDS communicates with the vehicle and the ECM. If it doesn't, troubleshoot the DLC circuit.
  1. Select DIESEL system, INSPECTION, then the ALL INJECTORS OFF on the HDS.
  1. Remove the engine cover.
  1. Remove the four glow plugs.
  1. Attach the compression gauge to the glow plug hole.
  1. Crank the engine with the starter motor, and measure the compression.
    Compression Pressure:
    Above 2.4 MPa (24.5 kgf/cm 2 , 348 psi)

  1. Measure the compression on the remaining cylinders.
    Maximum Variation:
    Within 200 kPa (2.0 kgf/cm 2 , 28 psi)

  1. If the compression is not within specifications, check the following items, then remeasure the compression.
    • Damaged or worn valves and seats
    • Damaged cylinder head gasket
    • Damaged or worn piston rings
    • Damaged or worn piston and cylinder bore
  1. Install the four glow plugs.
  1. Select ECM reset to cancel the ALL INJECTORS OFF function on the HDS.
  1. Install the engine cover.