Case IH 19416 – VCM / ECM: Blow by connection hose between Blow by valve and air duct dropped

The engine's control system has detected a loss of expected crankcase pressure, deducing that the crankcase ventilation (blow-by) hose connecting the blow-by valve (crankcase breather) to the air intake duct has physically disconnected, fallen off, or suffered a massive leak.

• Tier 4b
• Case N-Series Loader Backhoes and Forklifts
• 580N
• 580SN
• 580SN WT
• 590SN
• 570NXT
• 570N EP
• 586H
• 588H

1. 1

   Trace the blow-by hose routing from the crankcase breather valve (usually located on the breather cover/valve cover) to the air intake duct.

2. 2

   Look for a physically disconnected hose at either the valve or the air duct, and check for loose, broken, or missing hose clamps.

3. 3

   Inspect the hose itself for severe cracks, splits, dry rot, or collapsing that could simulate a disconnected hose.

4. 4

   Check the crankcase pressure sensor and its wiring harness. If the sensor is faulty, it may falsely report a dropped hose.

1. 1

   Preparation

   Safely park the machine, turn off the engine, and allow it to cool down to avoid burns from hot engine components.

2. 2

   Access the Engine

   Open the forward-tilt engine hood to access the FPT 3.4L engine.

3. 3

   Locate the Components

   Locate the blow-by valve (crankcase breather cover) and the main air intake duct.

4. 4

   Reattach or Replace

   If the hose has simply slipped off: Clean the fitting surfaces on both the blow-by valve and the air duct. Reattach the hose and secure it tightly with the hose clamps. If the hose is damaged: Loosen the hose clamps at both ends. Remove the damaged blow-by hose. Install a new OEM replacement hose, ensuring it is routed correctly without any kinks.

5. 5

   Secure

   Tighten the hose clamps securely at both ends.

6. 6

   Clear Codes

   Connect a diagnostic scan tool (such as the Case Electronic Service Tool) to the machine's diagnostic port and clear the 19416 fault code.

7. 7

   Test

   Start the engine and let it run. Verify that there are no crankcase gas leaks around the fittings and that the fault code does not return.