Each month in Diagnose This! we present a real-life service scenario with clues as to what the ultimate diagnosis was. If you think you know the answer, be the first to e-mail firstname.lastname@example.org with the correct response for free Truck Parts & Service merchandise. The answer will be revealed in a future issue of the magazine.
This month’s Diagnose This! is submitted by ASE master technician and owner of Fleet Guardian, Damon Russell.
If you have a Diagnose This! puzzler you would like to submit, please send it to email@example.com.
Vehicle: 2005 International 4400 tractor
Key components: Allison HT570 automatic transmission, air brakes
Scenario: This municipal vehicle’s city horn beeps exactly twice every time the ignition key is turned to the “run” position.
- The vehicle is unmodified from the OEM configuration.
- No added warning devices or theft prevention exist on the vehicle.
- The city horn does not work when the horn pad is depressed.