Hyundai Santa Cruz (NX4A OB) 2021-2025 Service Manual / Engine Mechanical System / Troubleshooting
Hyundai Santa Cruz: Engine Mechanical System / Troubleshooting
| Probable Cause | Remedy |
| Worn bearings due to shortage orexcessive oil | Replace the crankshaft and bearings as required. |
| Improperly installed flywheel | Repair or replace the flywheel as required. |
| Worn piston rings.(Oil consumption may or may not cause the engine to misfire.) | Inspect compression pressure. Repair or replace as required. |
| Worn crankshaft thrust bearings. | Replace the crankshaft and bearings as required. |
| Hydraulic Valve Clearance Adjustment Unit (HLA) Poor operation (HLA) Internal Oil Pressure Not Formation Causes HLA Pressing | Replace the HLA. |
| Abnormal wear of swing arm (bearing and body) | Replace the swing arm assembly. |
| Probable Cause | Remedy |
| Stuck valves. (Carbon buildup on the valve stem can cause the valve not to close properly.) | Repair or replace as required. |
| Excessive worn or mis-aligned timing chain. | Replace the timing chain and sprocket as required. |
| Worn camshaft lobes. | Replace the camshaft and valve lifters. |
| Hydraulic Valve Clearance Adjustment Unit (HLA) Poor operation (HLA) Internal Oil Pressure Not Formation Causes HLA Pressing | Replace the HLA. |
| Abnormal wear of swing arm (bearing and body) | Replace the swing arm assembly. |
| Probable Cause | Remedy | ||||||||
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| Probable Cause | Remedy |
| Worn valves, valve guides and/or valve stem oil seals. | Repair or replace as required. |
| Worn piston rings. (Oil consumption may or may not cause the engine to misfire) | Inspect compression pressure. Repair or replace as required. |
| Probable Cause | Remedy |
| Incorrect oil viscosity. | Refill with the correct viscosity oil. |
| Worn crankshaft thrust bearings. | Inspect the crankshaft thrust bearings. Repair or replace as required. |
| Probable Cause | Remedy |
| Low oil pressure. | Repair or replace as required. |
| Broken valve spring. | Replace the valve spring. |
| wear of swing arm | Replace the swing arm |
| Abnormal wear of swing arm (bearing and body) | Replace the swing arm assembly |
| Stretched or broken timing chain and/or damaged sprocket teeth. | Replace the timing chain and sprockets. |
| Worn timing chain tensioner. | Replace the timing chain tensioner as required. |
| Worn camshaft lobes. | Inspect the camshaft lobes. Replace the camshaft and valve lifters as required. |
| Worn valve guides or valve stems. | Inspect the valves and valve guides, then repair or replace as required. |
| Worn drive belt, idler, tensioner and bearings. | Replace the belt and related parts as required. |
| Probable Cause | Remedy | ||||||
| Low oil pressure | Repair or replace damaged parts as required | ||||||
| Loosened or damaged flywheel. | Repair or replace the flywheel. | ||||||
| Damaged oil pan, contacting the oil pump screen. | Inspect the oil pan. Inspect the oil pump screen. Repair or replace as required. | ||||||
| Loosened, damaged or clogged oil pump screen. | Inspect the oil pump screen. Repair or replace as required. | ||||||
| Excessive piston-to-cylinder bore clearance. | Inspect the piston and cylinder bore. Replace as required. | ||||||
| Excessive piston pin-to-piston clearance | Inspect the piston, piston pin and the connecting rod. Repair or replace as required. | ||||||
| Excessive connecting rod bearing clearance | Inspect the following components and repair or replace as required.
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| Excessive crankshaft bearing clearance | Inspect the following components, and repair or replace as required.
| ||||||
| Incorrect piston, piston pin and connecting rod installation. | Verify the piston pins and connecting rods are installed correctly. Repair as required. |
| Probable Cause | Remedy | ||||||
| Low oil pressure | Repair or replace as required. | ||||||
| Excessive connecting rod bearing clearance. | Inspect the following components and repair or replace as required :
| ||||||
| Excessive crankshaft bearing clearance. | Inspect the following components and repair or replace as required :
|
| Probable Cause | Remedy | ||||||
Fluid entering the cylinder
| - Remove the spark plugs and check for fluid. - Inspect for broken head gasket. - Inspect for cracked engine block or cylinder head. - Inspect for a sticking fuel injector and/or leaking from fuel pressure regulator. | ||||||
| Broken timing chain and/or timing chain sprockets. | Inspect timing chain and sprockets. Repair or replace as required. | ||||||
Foreign material in cylinder
| Inspect cylinder for damaged components and/or foreign materials Repair or replace as required. | ||||||
| Seized crankshaft or connecting rod bearings. | Inspect crankshaft and connecting rod bearing. Repair or replace as required. | ||||||
| Bent or broken connecting rod. | Inspect connecting rods and repair or replace as required. | ||||||
| Broken crankshaft | Inspect crankshaft. Repair or replace as required. |
Repair procedures
- Compression Pressure Inspection
• If the there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure.
1.Start the engine until ...
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Hyundai Santa Cruz (NX4A OB) 2021-2025 Service Manual: ESC OFF Switch
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Hyundai Santa Cruz 2021-2025 Owners Manual: Lane Keeping Assist (LKA)
Lane Keeping Assist is designed to help
detect lane markings (or road edges)
while driving over a certain speed. Lane
Keeping Assist will warn the driver if the
vehicle leaves the lane without using the
turn signal, or will automatically assist
the driver’s steering to help prevent the
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