Pinpoint Test U: Injector Driver Module Feedback: Description

Injector Driver Module (IDM) provides EF output signal to PCM to confirm that proper timing and duration of Fuel Delivery Command Signal (FDCS) was received. Additionally, EF signal is used to send diagnostics of IDM and injectors (electrical) to PCM. DTC 1668 indicates PCM-IDM diagnostic communication error.

Perform this test when directed here by QUICK TEST. This pinpoint test is intended to diagnose:

• Injector Driver Module (IDM).
• Wiring harness circuit (EF).
• Powertrain Control Module (PCM).

Fig 1: Identifying Injector Driver Module Feedback Circuit