How to diagnose a faulty ECU video with questions

What is the recommended static battery voltage for an engine ECU when the engine is off?

• Around 10.5 volts

• Around 11.0 volts

• Around 12.6 volts

• Around 14.0 volts

How does the permanent positive battery connection typically reach the engine ECU?

• Directly from the battery terminals.

• Through a fuse box or body control module.

• Via the vehicle's alternator.

• Only when the ignition is turned on.

If a battery voltage is measured at 12.6V, but the voltage at the ECU pin is 11.3V, what does this indicate?

• The ECU is functioning correctly.

• The battery is overcharged.

• A potential fault with the wiring.

• The engine is running efficiently.

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When checking the CAN bus signals with a two-channel oscilloscope, what characteristic should the two signals (CAN high and CAN low) exhibit?

• They should be identical in shape and voltage.

• They should be completely flat lines.

• They should be mirror images of each other.

• One signal should be consistently high, and the other consistently low.