Open Circuit

If there is no continuity, the circuit is open. Repair or replace the harness.
- MAF circuit (MAF sensor connector terminal B and PCM connector terminal 4X).
- Power circuit (MAF sensor connector terminal C and main relay terminal D through common connector).
- GND circuit (MAF sensor connector terminal A and PCM connector terminal 4A through common connector).
Fig 1: Identifying Main Relay & Maf Sensor Connector Terminals
Courtesy of MAZDA MOTORS CORP.