Harvard diagnostic reference

Explore 2 connection profiles and 71 enhanced definition variants recorded for Harvard. Reference relationships describe the library, not road-test coverage.

Vehicle and connection profiles

First Love / Jolion 1.5T (4B15D)Harvard
First Love / Jolion 1.5T (4G15H, 4G15K, 4B15C)Harvard

Enhanced PID meanings

Browse individual signal meanings, units and exact profile links.

Browse Harvard enhanced signals

Trouble-code reference families

Euler / Great Wall / Harvard / Haval — Reference family assigned by the production catalog. An entry in this family is not proof of a fault or ECU support on every listed vehicle.

Source and applicability

OBD Lens production library legacy-owner-2026-10-09-v81. This is a scoped technical reference, not a scan of your car. A catalog relationship does not certify that every ECU, year or engine returns the same signal or code definition.

Read the reference method

OBD Lens reference library · catalog legacy-owner-2026-10-09-v81. Sources and scope