Kubota P0268 – Engine Control Module (ECM): Injector Driver #3 Short-To-Power

The system has detected an electrical fault on the #3 cylinder's fuel injector circuit. Specifically, the code sets when the injector driver circuit is shorted to a voltage source between the injector and the ECM, the injector coil is shorted internally, or there is a loss of the 12.0V feed to the injector. It can also be triggered if the battery voltage drops below 16.0V while the engine is running and the injector's on-state low-side voltage is out of specification.

• WG1605-G-E3
• WG1605-L-E3
• WG1605-GL-E3
• WG1605-N-E3
• WG1605-LN-E3
• WG1605-GLN-E3
• WG972
• WG2503
• WG3800
• Toro mowers
• PowerBoss sweepers
• Genie S-80
• Genie S-85

1. 1

   Inspect the wiring harness and connectors for fuel injector #3 for damage, bad contact, aging, looseness, or exposed wires that could be shorting to a power source

2. 2

   Verify the battery voltage is within the normal operating range, as voltage irregularities can trigger the code

3. 3

   Disconnect the fuel injector #3 wiring harness connector and check for a short to voltage in the injector driver circuit between the injector plug and the ECM pins

4. 4

   Test the #3 injector coil resistance to see if it is shorted internally, and verify that the injector is receiving its proper 12.0V feed

5. 5

   Use the Kubota GCP Diagnostic Display Tool or EDIS software to monitor the fault codes and live data

1. 1

   Prepare machine for service

   Park the machine on firm, level ground. Stop the engine, remove the key, and allow the engine to cool completely.

2. 2

   Disconnect battery

   Disconnect the battery negative cable.

3. 3

   Replace engine wiring harness

   If a short to power is found in the harness, the wiring must be addressed by replacing the affected engine wiring harness (Kubota does not approve wiring harness repairs).

4. 4

   Replace fuel injector #3

   If the wiring tests good but the #3 injector coil is shorted internally, remove the fuel rail/delivery pipe and replace fuel injector #3.

5. 5

   Replace ECM

   If both the wiring harness and the fuel injector test perfectly fine, the ECM's internal injector driver is likely faulty. Replace the ECM.

6. 6

   Verify repair

   Reconnect the battery, start the engine, and use the diagnostic software to clear the fault codes and verify the repair.