Circuit Open/Short Inspection

1. Disconnect the PCM connector. (See the appropriate procedure.)
2. Inspect the following wiring harnesses for open or short circuit (continuity check).
   Fig 1: PCM Connector

   Courtesy of MAZDA MOTORS CORP.

Open circuit 

• If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
  • Fuel injector No. 1 terminal B and PCM terminal 2BB
  • Fuel injector No. 2 terminal B and PCM terminal 2BC
  • Fuel injector No. 3 terminal B and PCM terminal 2BD
  • Fuel injector No. 4 terminal B and PCM terminal 2AZ
  • Fuel injector No. 1 terminal A and main relay
  • Fuel injector No. 2 terminal A and main relay
  • Fuel injector No. 3 terminal A and main relay
  • Fuel injector No. 4 terminal A and main relay

Short circuit 

• If there is continuity, there is a short circuit. Repair or replace the wiring harness.
  • Fuel injector No. 1 terminal B and body ground
  • Fuel injector No. 1 terminal B and power supply
  • Fuel injector No. 2 terminal B and body ground
  • Fuel injector No. 2 terminal B and power supply
  • Fuel injector No. 3 terminal B and body ground
  • Fuel injector No. 3 terminal B and power supply
  • Fuel injector No. 4 terminal B and body ground
  • Fuel injector No. 4 terminal B and power supply
  • Fuel injector No. 1 terminal A and body ground
  • Fuel injector No. 2 terminal A and body ground
  • Fuel injector No. 3 terminal A and body ground
  • Fuel injector No. 4 terminal A and body ground