Diagnostic Aids

Check connection at fuel injector driver. Clear DTC and cycle ignition. If DTC clears, treat condition as an intermittent.

Fig 1: DTC 56 Schematic ("G" Series) Injection Pump Calibration Resistor Error

Fig 2: DTC 56 Schematic ("P" Series) Injection Pump Calibration Resistor Error

Fig 3: DTC 56 Flow Chart (All Models) Injection Pump Calibration Resistor Error