MaxiCharger isolation

How it presents

Symptom

Autel MaxiCharger DC fails isolation/CableCheck on one connector while the peer port on the same dual-standard unit stays healthy. Because MaxiCharger DC often pairs a CCS and NACS port from a shared cabinet, techs must confirm which physical port and which cable actually failed before assuming a cabinet-wide isolation fault.

Root causes (by observed frequency)

1. #1 Moisture or insulation breakdown in the cable/gun on the failing port

   Prove with a known-good cable rated for that specific standard before opening the cabinet.

2. #2 Technician or driver assumed the wrong port during a dual-standard swap, masking which side actually failed

   Always confirm CCS vs NACS explicitly in the ticket — the two ports do not share ISO history.

3. #3 Shared internal ISO measurement path affected by contamination on one leg

   Rare on MaxiCharger DC's isolated architecture but check coolant residue near quick-connects if liquid-cooled variant.

4. #4 ISO measurement hardware fault on the affected port's power path

   Last resort — only pursue after both a known-good cable and dry retest fail.

Diagnostic procedure

1. 1. Confirm exactly which port (CCS or NACS) reported the failure and whether the peer port completed a session normally.

   Expected: Fault is isolated to one named port with the peer port healthy

   Tools: HMI, service log

2. 2. Swap in a known-good cable rated for that specific connector standard and re-run CableCheck.

   Expected: Fault clears with the substitute cable, confirming the original cable as the cause

   Tools: known-good CCS or NACS cable

3. 3. Inspect the connector and any liquid-cooled quick-connects for moisture, coolant residue, or visible damage.

   Expected: No moisture or coolant residue present at the connector interface

   Tools: flashlight, IR camera

4. 4. If dry and known-good cable both fail, run the OEM isolation self-test from the service menu on the affected port.

   Expected: Self-test isolates the fault to a specific internal ISO measurement component

   Tools: Autel service tool

5. 5. Escalate to Autel OEM support with the port ID, cable test result, and self-test output if the fault remains.

   Expected: OEM confirms hardware fault and issues a repair or RMA path

   Tools: Autel OEM support

The fix

Prove port and cable first on this dual-standard unit; do not condemn the whole cabinet for a single-port isolation fault.

• CCS or NACS cable/gun matching the failed port

  Must match the exact standard — CCS and NACS cables are not interchangeable on MaxiCharger DC

• ISO measurement module

  Autel OEM part, ordered per affected port

1. Identify and document the exact port that failed CableCheck, since MaxiCharger DC's dual-standard design means the CCS and NACS sides can fail completely independently of each other.
2. Substitute a known-good cable rated for that same standard and re-test, because a worn or wet cable on one port explains the large majority of single-port isolation faults on this platform.
3. If the cable proves clean, inspect and dry the connector interface and any liquid-cooled quick-connects before considering the isolation hardware itself suspect.
4. Only after both the cable and the physical connector are proven clean should the port-specific ISO measurement module be replaced through Autel's OEM channel, followed by a full CableCheck and validation session on that port.