Note: Resistance: less than 1 ohm.
2. Checking the connector of the engine control unit (ECM): Disconnect the engine control unit connector (ECM) and visually check the terminals «masses» block side and harness side for bent contacts or weak contact pressure. If a problem is found, fix it.
3. If the problem is not found in steps 1 and 2, the electronic engine control unit may be faulty (ECM). In this case, before replacing the unit with a new one, check that there are no fault codes. After replacing the unit, recheck the vehicle. If fault codes appear, check them before replacing the unit.
4. Re-checking the original electronic engine control unit (ECM). Install the original block (possibly faulty) into a known-good vehicle and test. If the problem persists, replace the original unit with a new one. If everything is in order, then the malfunction is intermittent.