Diesel Data: Automotive Repair

Initial Inspection and Diagnostic Overview

CHECK SPEEDOMETER

a. Check operation.




1. Using a speedometer tester, check that the speedometer reading is within the allowable range shown in the table. Also, check for proper operation of the odometer.

NOTE: Do not use worn, underinflated or overinflated tires, as the speedometer reading will be inaccurate.

2. Check the deflection width of the speedometer indicator.

Reference: Below 0.3 mph

If the result is not as specified, the speedometer may have a malfunction.