Circuit Open/Short Inspection

WARNING: This page is about a different variant/trim than selected.

Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION ).
Inspect the following wiring harnesses for an open or short circuit (continuity check).

Fig 1: Identifying EVAP System Leak Detection Pump & Main Relay Connector Terminals
Courtesy of MAZDA MOTORS CORP.

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 3V
- EVAP system leak detection pump terminal D and PCM terminal 3Y
- EVAP system leak detection pump terminal A and main relay terminal C
- EVAP system leak detection pump terminal B and the body Ground
  
  Fig 2: PCM Connector Terminal Identification
  Courtesy of MAZDA MOTORS CORP.

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 Ground
- EVAP system leak detection pump terminal B and power supply