Electrical Diagnostics for Aftertreatment

Voltage, ground, reference, signal, CAN — and voltage drop

The meter is your most powerful diagnostic tool. Learn to read it and choose the next test.

1. 1.Voltage, Ground & 5V Reference
2. 2.Signal Circuits & CAN Communication
3. 3.Resistance, Continuity & Voltage Drop
4. 4.Shorts to Ground, Shorts to Power, Opens
5. 5.Intermittent Faults
6. 6.Connector Corrosion, Harness Damage & Chafing
7. 7.Heat Damage
8. 8.Electrical Diagnostic Exercises