Fuel Injector (FS, RS) Operation Inspection

WARNING: This page is about a different car, the 2004 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.

Connect the WDS or equivalent to the DLC-2.
Warm up the engine and idle it.
Monitor the following PID.
- Engine speed signal (RPM)
Verify that there is no output of the fuel injector (FS, RS) control signal wave pattern from the following PCM terminal when idling:
- PCM terminal 2G (FS)
- PCM terminal 2D (RS)
- If the signal wave pattern cannot be verified, perform the following inspections and repair or replace the malfunctioning part.
  - Mass air flow sensor
  - Throttle position sensor
  - Intake air temperature sensor
Fig 1: Identifying PCM Wiring Harness Side Connector Terminals
Courtesy of MAZDA MOTORS CORP.
Verify that there is output of fuel injector (FP2, RP2) control signal wave pattern from the following PCM terminals when the PID RPM is 5,000 RPM or more.
- PCM terminal 2G (FS)
- PCM terminal 2D (RS)
- If the signal wave pattern can be verified, perform the following inspections and repair or replace the malfunctioning part.
  Fuel injector (FS)
  - Open or short circuit of the wiring harness between PCM terminal 2G and fuel injector (FS) terminal 2G and fuel injector (FS) terminal B
  - Open circuit in the wiring harness between fuel injector (FS) terminal A and main relay terminal
  - Open circuit in the fuel injector (FS) internal circuit
    Fuel injector (RS)
  - Open or short circuit in the wiring harness between PCM terminal 2D and fuel injector (RS) terminal B
  - Open circuit in the wiring harness between fuel injector (RS) terminal A and main relay
  - Open circuit in the fuel injector (RS) internal circuit
Fig 2: Identifying Fuel Injector & Main Relay Connector Terminals
Courtesy of MAZDA MOTORS CORP.