SPN 558/FMI 3 This diagnostic condition is typically an open circuit.‪ Check as follows:‪ Disconnect the Idle Validation Switch. Turn the ignition ON (key ON,…

SPN 596/FMI 19 This fault is typically J1939 Cruise Control Enable Switch signal from Source #1, #2, or #3 is erratic.‪ Check as follows:‪ Check…

SPN 596/FMI 13 This fault is typically the J1939 Cruise Control Enable Switch signal from Source #1, #2, or #3 is missing.‪ Check as follows:‪…

SPN 597/FMI 19 This fault is typically J1939 Service Brake Switch signal from Source #1, #2, or #3 is erratic.‪ Check as follows:‪ Check for…

SPN 597/FMI 13 This fault is typically the J1939 Service Brake Switch signal from Source #1, #2, or #3 is missing.‪ Check as follows:‪ Check…

SPN 599/FMI 4 This diagnosis is typically both Cruise Control switches, SET and RES, are shorted to ground.‪ Check as follows:‪ Turn the ignition ON…

SPN 600/FMI 19 This fault is typically J1939 Cruise Control Coast Switch signal from Source #1, #2, or #3 is erratic.‪ Check as follows:‪ Check…

SPN 600/FMI 13 This fault is typically the J1939 Cruise Control Coast Switch signal from Source #1, #2, or #3 is missing.‪ Check as follows:‪…

SPN 602/FMI 19 This fault is typically J1939 Cruise Control Accelerate Switch signal from Source #1, #2, or #3 is erratic.‪ Check as follows:‪ Check…

SPN 602/FMI 13 This fault is typically the J1939 Cruise Control Accelerate Switch signal from Source #1, #2, or #3 is missing.‪ Check as follows:‪…