ISO 15118 & DIN 70121 EV Charger Testing Plan

Freeze the communication scope

Record whether the project requires DIN SPEC 70121, ISO 15118-2, ISO 15118-20 or a defined combination, together with the charger firmware and intended charging mode. Treat each document and edition as a separate scope item because messages, state behavior and optional functions are not interchangeable.

Define whether the work supports development diagnosis, interoperability, regression or preparation for a formal procedure. The equipment configuration and result language should stay within that purpose and must not imply certification without the applicable accredited process.

• ✓ Name every protocol and edition
• ✓ Record charger firmware and charging mode
• ✓ Define the decision the test supports

Correlate PLC traffic with charger behavior

A useful setup observes the control-pilot state, PLC session and electrical response on a common timeline. Retain raw messages when encoding, sequence or timing matters, and compare requested values with the charger report and independent voltage or current measurements where required.

Confirm which parts of SLAC, session setup, parameter exchange, energy transfer and termination the selected tools can generate and decode. State separately whether certificate handling, Plug & Charge or bidirectional functions are included in the approved scope.

• ✓ Capture raw PLC messages and timestamps
• ✓ Align pilot, messages and measurements
• ✓ List optional security or bidirectional functions

Build repeatable normal and fault cases

Start with one known normal charging path, then change one approved condition at a time. Define the injected message, delay, parameter or termination condition, expected charger response and safe boundary before execution.

Store the tester configuration, protocol stack version, charger identity, measured output and final result with every case. This record helps distinguish a charger defect from a test-tool, connection, load or version mismatch.