Kubota E:9107 – Engine ECU: Intake air pressure sensor system

The Engine Control Unit (ECU) has detected an out-of-range signal, a lack of signal, or an improper pressure reading from the intake air pressure sensor (boost sensor). This sensor monitors intake air pressure and temperature to manage electronic fuel injection, turbocharger boost, and emissions systems, meaning a failure can disrupt engine performance and DPF regeneration.

• SVL65-2
• SVL75-2
• SVL90-2
• SVL95-2s
• SVL97-2
• SSV65
• SSV75

1. 1

   Check the primary and secondary air filters to ensure they are not plugged, and inspect the air intake inlet for physical blockages (e.g., debris or rodent nests).

2. 2

   Thoroughly inspect the electrical wiring harness leading to the intake air pressure sensor. Look for rubbing against the chassis or brackets behind the air filter housing, which can cause wires to break or ground out.

3. 3

   Check the electrical connector at the sensor (mounted upstream in the intake) for corrosion, moisture, or loose pins.

4. 4

   Inspect the boost sensor pressure rubber piping (the suction pipe downstream of the air flow sensor) for cracks or leaks that can cause false pressure readings.

1. 1

   Prepare machine for service

   Park the machine on a firm, level surface. Lower the lift arms to the ground, apply the parking brake, turn off the engine, and disconnect the negative battery cable.

2. 2

   Resolve airflow restrictions

   If the air filters are clogged, clean the air intake housing and install new primary and secondary air filter elements.

3. 3

   Repair wiring harness

   If chafed or broken wires are found behind the air filter housing, repair the wires using solder and heat-shrink tubing. Re-loom the harness and secure it with zip-ties away from sharp brackets to prevent future rubbing.

4. 4

   Replace rubber piping

   If the boost sensor pressure rubber piping is cracked or leaking, remove the retaining clamps and install a new hose.

5. 5

   Replace intake air pressure sensor

   If the wiring and airflow are fine, the sensor itself has likely failed. Disconnect the electrical pigtail, unbolt/unthread the old intake air pressure sensor from the intake manifold, and install the new OEM sensor. Reconnect the wiring harness.

6. 6

   Clear codes and force DPF regeneration

   Reconnect the battery and start the machine. Connect a dealer-level diagnostic tool (such as Kubota Diagmaster or Jaltest) to clear the ECU codes and force a manual DPF regeneration if the system was inhibited.