System Diagnosis (Start Here)

System Diagnosis:

Refer to the chart for system problem determination. If fault codes are present, follow test points in order of code display. If no codes are present or Bosch tester 9288 or 9268 is unavailable, follow applicable test points in numerical order for diagnosis. Complete all applicable test points and check component wiring before replacing or suspecting DME control unit. If a component is found to be defective, verify that original complaint has been resolved after replacing. If symptoms persist, return to beginning of diagnostic chart.