Symptom-Driven Diagnostics Index

Electrical Pretest ProceduresSymptomPage #
Power-up Sequence TestTransmission fails to power up at ignitionPower-Up Sequence
Electrical PretestBasic test of vehicle electrical systemElectrical Pretest Identification
Isolation ProceduresSymptomPage #
Start Enable Relay Contact TestEngine cranking issues without any fault codesStart Enable Relay Contact
J1587 Data Link TestNo J1587 communicationJ1587 Data Link
J1939 Data Link TestNo J1939 communicationJ1939 Vehicle Data Link Test
Brake Switch Functionality TestBrake and Park Switch input communicationBrake Switch Functionality
Main Case Control TestGear display shows a dash “-”Main Case Control
Transmission Not Engaging a Gear From Neutral TestTransmission does not engage a gear from neutralTransmission Not Engaging a Gear From Neutral
Transmission Shift Complaint TestShift complaint exists without any fault codesTransmission Shift Complaint
Shift Interlock InspectionSlow or incomplete shiftsShift Interlock Inspection