PNW_Wesley
New member
Zenith has a 2014 E-Tec 90.
During the last 30 minutes of our recent cruise, the engine warning horn came on, but at a very low volume. None of the warning lights in the tach were lit, and the engine ran fine, as it always does.
Today, I went to where the boat is stored to do some preliminary testing.
During the engine monitor self-test, which occurs when turning the ignition key from off to on, the horn beeps for 0.5 second at full volume, all 4 warning lights come on and then go off one by one. This is the exact response that the Operator’s Guide describes.
When self-test completes, the horn remains on at very low volume.
From the “SystemCheck MWS Harness Connections” diagram, it appears as if the horn driver circuitry resides in the engine computer.
The fact that the self-test passes tells me that the horn driver circuitry is capable of driving the horn at the correct volume, with the correct amount of current flowing through the horn.
I have not yet pulled any connectors or made voltage/continuity checks, as I do not have a diagram which shows the actual pinouts and signal names in the harness.
Since the horn stays on at low volume, it seems there is a fault in the horn driver circuitry which allows a very low amount of current to flow through the horn when there should be zero current.
Has anyone else encountered this exact condition?
During the last 30 minutes of our recent cruise, the engine warning horn came on, but at a very low volume. None of the warning lights in the tach were lit, and the engine ran fine, as it always does.
Today, I went to where the boat is stored to do some preliminary testing.
During the engine monitor self-test, which occurs when turning the ignition key from off to on, the horn beeps for 0.5 second at full volume, all 4 warning lights come on and then go off one by one. This is the exact response that the Operator’s Guide describes.
When self-test completes, the horn remains on at very low volume.
From the “SystemCheck MWS Harness Connections” diagram, it appears as if the horn driver circuitry resides in the engine computer.
The fact that the self-test passes tells me that the horn driver circuitry is capable of driving the horn at the correct volume, with the correct amount of current flowing through the horn.
I have not yet pulled any connectors or made voltage/continuity checks, as I do not have a diagram which shows the actual pinouts and signal names in the harness.
Since the horn stays on at low volume, it seems there is a fault in the horn driver circuitry which allows a very low amount of current to flow through the horn when there should be zero current.
Has anyone else encountered this exact condition?