ZDX V6-3.7L (2010)
Compression Check: Testing and Inspection
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.
1. Warm up the engine to normal operating temperature (cooling fan comes on).
2. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
3. Connect the Honda Diagnostic System (HDS) to the data link connector (DLC) See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Initial Inspection and Diagnostic Overview.
4. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
5. Make sure the HDS communicates with the vehicle and the PCM. If it does not communicate, troubleshoot the DLC circuit See: Powertrain
Management/Computers and Control Systems/Testing and Inspection/Component Tests and General Diagnostics/DLC Circuit Troubleshooting.
6. Select ALL INJECTORS STOP in the PGM-FI INSPECTION menu with the HDS.
7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
8. Remove the six ignition coils and the six spark plugs See: Powertrain Management/Ignition System/Ignition Coil/Service and Repair.
9. Attach the compression gauge to a spark plug hole.
10. Step on the accelerator pedal to open the throttle fully, then crank the engine with the starter motor, and measure the compression.
NOTE: The auto-start function cranks the engine until it starts, or for 15 seconds if the engine does not start.
11. Measure the compression on the remaining cylinders.
12. If the compression is not within specifications, check the following items, then remeasure the compression.
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Incorrect valve clearance
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Confirmation of cam timing
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Damaged or worn cam lobes
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Damaged or worn valves and seats
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Damaged cylinder head gaskets
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Damaged or worn piston rings
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Damaged or worn piston and cylinder bore
