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MAINTENANCE
Diagnostic Display Code Definitions
Open Load: There is a break in the wires that lead to the item listed in
the chart (injector, fuel pump, etc.), or the item has failed.
Short-to-Ground:
The wire is shorted to ground between the electronic
control unit and the item listed in the chart.
Shorted Load:
The wires leading to the item listed in the chart are
shorted together, or the item has shorted internally.
Short-to-Battery:
The wire leading from the item listed in the chart to
the electronic control unit is shorted to a wire at battery voltage.
Diagnostic Codes
Component Condition SPN FMI
Throttle Position Sensor
Voltage Too High 51 3
Voltage Too Low 4
Abnormal Rate of Change 10
Vehicle Speed Sensor Data Erratic, Intermittent or Missing 84 2
Intake Air Temperature Sensor
Voltage Too High 105 3
Voltage Too Low 4
Barometric Pressure Sensor
Voltage Too High 108 3
Voltage Too Low 4
Engine Temperature Sensor
Voltage Too High 110 3
Voltage Too Low 4
Temperature Too High 16
Engine Overheat Shutdown 0
Temperature Above Normal Range 15
Alternator Power Supply
Potential (DC Chassis Voltage)
Voltage Too High 167 3
Voltage Too Low 4
Exhaust Temperature Sensor
Voltage Too High 173 3
Voltage Too Low 4
ECU Memory Checksum/CRC Error 628 13
Injector 1 (MAG Driver Circuit Open/Grounded 651 5
Driver Circuit Short to B+ 3
Injector 2 (PTO) Driver Circuit Open/Grounded 652 5
Driver Circuit Short to B+ 3
Knock Sensor 1 Voltage Too Low 731 4
Ignition Coil Primary Driver 1
(MAG)
Driver Circuit Open/Grounded 1268 5
Fuel Pump Driver Circuit Driver Circuit Open/Grounded 1347 5