Kubota P0202 – ECM: Cylinder 2 Fuel Injector Circuit Open

The Engine Control Module (ECM) has detected an open circuit for the fuel injector in cylinder #2. This indicates a break or disconnection in the wiring or connection associated with this circuit, preventing proper electrical flow. The code is triggered when the ECM does not detect the expected voltage or electrical current change that should occur when the injector driver grounds the circuit to activate it. This failure prevents the injector from spraying fuel into the cylinder, resulting in an engine misfire.

1. 1

   Inspect the wiring harness and connector for the cylinder #2 fuel injector for signs of damage, chafed or broken wires, corrosion, loose pins, or rodent damage

2. 2

   Perform a wiggle test with the engine idling by gently wiggling the injector connector and wiring to check for an intermittent connection

3. 3

   Check for power at the connector by using a multimeter to verify battery voltage is present with the key in the 'ON' position

4. 4

   Use a noid light plugged into the disconnected injector connector while cranking the engine; if it flashes, the control circuit is functioning correctly

5. 5

   Measure the fuel injector resistance across its terminals with a multimeter and compare to manufacturer specifications or other injectors (infinite resistance indicates an open circuit/faulty injector)

1. 1

   Clear fault code

   Using a diagnostic scan tool, clear the P0202 fault code and test drive the machine to see if the code returns.

2. 2

   Repair wiring and connectors

   If any damage was found during the visual inspection, repair or replace the affected wiring or connector. Ensure all connections are clean and secure.

3. 3

   Swap injectors

   To definitively determine if the injector is the issue, swap the cylinder #2 injector with an injector from another cylinder (e.g., #1 or #3). Clear the codes and run the engine. If the fault code follows the injector (e.g., P0201 or P0203), the injector is faulty. If P0202 returns, the problem lies within the wiring or the ECM.

4. 4

   Replace fuel injector

   If the fuel injector is confirmed to be faulty, replace it along with any associated seals or copper washers.

5. 5

   Test the ECM

   If the injector and wiring have been ruled out, the ECM's injector driver may be at fault. Have a qualified technician diagnose the ECM, which may need to be reprogrammed or replaced.