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HOMESERVICE MANUALSACURA2015MDX BASEREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALMECHANICALENGINE CONTROL AND ENGINE MECHANICAL - SERVICE, TESTING AND TROUBLESHOOTING (EXCEPT HYBRID)INSPECTIONENGINE COMPRESSION INSPECTIONINSPECTION
2015 Acura MDX Base

Engine Compression Inspection: Inspection

2015 Acura MDX BaseSECTION Inspection
NOTE: After this inspection, you must reset the PCM. Otherwise, the PCM will continue to stop the injectors from operating.
  1. Engine - Warm Up
    1. Start the engine. Hold the engine speed at 3, 000 rpm with no load (in P or N) until the radiator fan comes on, then let it idle.
  2. HDS DLC - Connect
    NOTE: For specific operations, refer to the user's manual that came with the HDS. Make sure the HDS is loaded with the latest software.

    1. Turn the vehicle to the OFF (LOCK) mode.

    2. Connect the HDS to the DLC - Refer to: How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the A/T System (2014 2015), or How to Troubleshoot the Brake Booster Pressure Monitoring System (2016 2017 2018 2019 2020), or How to Troubleshoot the Fuel and Emissions Systems(With Auto Idle Stop System) (2016)

    3. Turn the vehicle to the ON mode.

    4. Make sure the HDS communicates with the vehicle. If it does not communicate, go to the DLC circuit troubleshooting - Refer to: DLC Circuit Troubleshooting (2014 2015), or DLC Circuit Troubleshooting (2019 2020), or DLC Circuit Troubleshooting(Without CAN Gateway) (2016), or DLC Circuit Troubleshooting(With CAN Gateway) (2016), or DLC Circuit Troubleshooting (2017 2018), or DLC Circuit Troubleshooting (2017 2018)

    .
  3. All INJECTOR STOP - Select
    1. Select ALL INJECTORS STOP in the PGM-FI INSPECTION menu with the HDS.

    2. Turn the vehicle to the OFF (LOCK) mode.
  4. Ignition Coil and Spark Plug - Remove
  5. Engine Compression - Inspect
    GHH320119Courtesy of HONDA, U.S.A., INC.
    		 1. Attach a compression gauge to the spark plug hole.

    2. Step on the accelerator pedal to open the throttle fully, then crank the engine with the starter motor, and measure the compression.

    3. Measure the compression on the remaining cylinders.

    4. If the compression 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
    • Confirmation of camshaft timing
    • Damaged or worn cam lobes
    • Damaged or worn valves and seats
    • Damaged cylinder head gasket
    • Damaged or worn piston rings
    • Damaged or worn piston and cylinder bore

    5. Remove the compression gauge from the spark plug hole.
    Maximum Variation: 
    Within 200 kPa (2.04 kgf/cm 2, 29.0 psi) 
    Compression Pressure: 
    Above 930 kPa (9.48 kgf/cm 2, 134.8 psi) 
  6. Ignition Coil and Spark Plug - Install
  7. All INJECTOR STOP - Cancel
    1. Select PCM reset in the PGM-FI mode menu to cancel ALL INJECTORS STOP with the HDS.
RENDER: 1.0x

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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.