Who is correct when determining the next step for a hard fault regarding a fuel injector circuit?

In the context of diagnosing a hard fault in a fuel injector circuit, it is essential to follow a systematic troubleshooting approach rather than jumping to conclusions about repairs. The correct response highlights that neither technician's immediate actions are appropriate in this scenario.

When addressing a hard fault, especially in fuel injector circuits, it is crucial to first conduct a thorough diagnostic process to pinpoint the exact cause of the fault. This might involve checking power and ground connections, testing the injectors for resistance or continuity, as well as reviewing any related electronic control unit (ECU) signal outputs. By performing these tests, a technician can identify if the issue stems from the injectors themselves, the wiring, or the ECU.

Jumping straight to replacing the injectors without proper testing (as suggested by one technician) does not allow for a definitive understanding of the problem and may lead to unnecessary replacement of parts. Similarly, performing fuel pressure tests without first examining the electrical aspect of the injector circuit may not address the root cause of the hard fault.

Therefore, following a disciplined diagnostic approach is critical in accurately diagnosing fuel injector issues and determining the appropriate next steps to resolve a hard fault effectively.