Diagnostic Aids

If engine functions properly, check for a burned out bulb, blown gauges fuse, or circuit No. 419 open. If engine cranks but will not start, check for blown fusible link and for open circuit No. 440 to fuel pump relay.

Fig 1: CHART A-1 - MIL Circuit Flowchart ("C/K" & "G" Series Diesel)

Courtesy of GENERAL MOTORS CORP.