Circuit Open/Short Inspection

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

Fig 1: Connecting Special Service Tool (104 Pin Breakout Box)
Courtesy of MAZDA MOTORS CORP.

Tightening torque

7.9-10.7 N.m {80-110 kgf.cm, 69.5-95.4 in.lbf}
Inspect the following wiring harness for open or short (Continuity check).

Fig 2: Identifying EGR Boost Sensor Solenoid Valve & Main Relay Terminals
Courtesy of MAZDA MOTORS CORP.

Open circuit
- If there is no continuity, the circuit is open. Repair or replace the harness.
  - EGR boost sensor solenoid valve terminal B (harness-side) and 104 pin breakout box terminal 47
  - EGR boost sensor solenoid valve terminal A (harness-side) and main relay terminal D (harness-side)
Short circuit
- If there is continuity, the circuit as shorted. Repair or replace the harness.
  - EGR boost sensor solenoid valve terminal B (harness-side) and body GND
  - EGR boost sensor solenoid valve terminal A (harness-side) and power supply