Circuit Open/Short Inspection

WARNING: This page is about a different car, the 2004 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION .)
Inspect the following wiring harness for open or short circuit (continuity check).
1. Open circuit
  - If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
    - EVAP system leak detection pump terminal C and PCM terminal 1AJ
    - EVAP system leak detection pump terminal D and PCM terminal 1AF
    - EVAP system leak detection pump terminal A and main relay terminal
    - EVAP system leak detection pump terminal B and the body GND
1. Short circuit
  - If there is continuity, there is a short circuit. Repair or replace the wiring harness.
    - EVAP system leak detection pump terminal C and power supply
    - EVAP system leak detection pump terminal D and power supply
    - EVAP system leak detection pump terminal A and the body GND
    - EVAP system leak detection pump terminal B and power supply
Fig 1: Identifying Evaporative Emission System Leak Detection Pump & PCM Connector Terminals
Courtesy of MAZDA MOTORS CORP.