Use Diagnostic Trouble Codes (DTCs) (from the DTC checks) in the table below to determine the trouble area and proper inspection procedure. The Supplemental Restraint System (SRS) diagnostic trouble code chart is shown below as an example.

Symptom simulation
Problem symptoms tableOn-vehicle inspection
1. INSPECT SPEEDOMETER
(a) Check the operation.
Using a speedometer tester, inspect the speedometer for acceptable
indication error and check
the operation of the odometer.
Reference: km/h (Canada)
Reference: mph (U.S.)
NOTICE:
Tire wear and over or under tire press ...