Circuit Open/Short Inspection

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

Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION .)
Connect the SST (104 Pin Breakout Box) with the PCM disconnected.
Tighten the connector attaching bolt.
Tightening torque

3.0-5.4 N.m {30-56 kgf.cm, 27-48 in.lbf}

Fig 1: Connecting Special Service Tool (104 Pin Breakout Box)
Courtesy of MAZDA MOTORS CORP.
Inspect the following wiring harness for open or short circuit (Continuity check).
Open circuit
- If there is no continuity the circuit is open. Repair or replace the harness.
  - EVAP system leak detection pump terminal C (harness-side) and 104 pin breakout box terminal 67
  - EVAP system leak detection pump terminal D (harness-side) and 104 pin breakout box terminal 43
  - EVAP system leak detection pump terminal a (harness-side) and main relay terminal D (harness-side)
  - EVAP system leak detection pump terminal B (harness-side) and the body GND
  Fig 2: Identifying Leak Detection Pump & Main Relay Terminals
  Courtesy of MAZDA MOTORS CORP.
Short circuit
- If there is continuity, the circuit is shorted. Repair or replace the harness.
  - EVAP system leak detection pump terminal C (harness-side) and power supply
  - EVAP system leak detection pump terminal D (harness-side) and power supply
  - EVAP system lea detection pump terminal A (harness-side) and the body GND
  - EVAP system leak detection pump terminal B (harness-side) and power supply