⚠️NOTE: Remember that engine won't run on all cylinders or won't start at all if male terminals are connected in wrong polarity. In that case you need to de-pin the injector connectors and reverse the polarity.
Injector polarity must be identified on the engine’s wiring harness (the wires coming from the engine control unit to the fuel injectors). This ensures that the male connectors of the eFlexFuel wiring harness are connected with the correct orientation.
How to identify injector polarity:
- Set the multimeter to continuity mode
- Confirm the mode is active by touching the probes together. You should hear an audible beep.
- If your multimeter doesn't have a continuity test, you can use the resistance (Ω) setting instead, following the same logic. The resistance should be close to 0 ohms between connected terminals.
- Select two injector connectors
- Start with two injector connectors from the engine wiring harness (for example, cylinders 1 and 2).
- Identify the common terminals
- Place one probe on either terminal of the first injector connector.
- Place the second probe on the corresponding side of the second injector connector.
- If the multimeter beeps, these terminals are connected together and represent the positive (+12 V) side.
- If no beep is heard, switch to the opposite terminals on both connectors and test again.
- Verify across all cylinders
- Keep one probe on the confirmed positive terminal of the first injector connector.
- With the other probe, test the injector connectors of all remaining cylinders to confirm which side produces a beep. These are the positive terminals.
- Document the polarity
- Write down which side of each injector connector is positive or memorize it. This information is essential when connecting the male injector connectors of the eFlexFuel wiring harness.