The diode serves to prevent voltage spikes from the injectors from interfering with other ECU circuits. In the event that the E1 wiring to chassis is open circuit, E1 circuit current could flow through the diode to ground. To provide a redundant ground for the ECU, these two grounds are tied to the E1 circuit through a diode. The ECU supplies a chassis ground through the E1 circuit which typically terminates somewhere on the engine.Ĭircuits E01 and E02 serve as grounds for the fuel injector driver circuits. Referring to an EWD, you will notice that the throttle position sensor, water and air temperature sensors, and air flow meter all flow current to ground through circuit E2. The E2 circuit serves as a signal return or sensor ground. Toyota EFI systems use a redundant ground system which significantly reduces the chance of ground problems however, this circuit should never be overlooked when troubleshooting ECU related systems. No electrical circuit will function normally without a dependable ground.
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