Fuel Injector (FP2, RP2) 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 (FP2, RP2) control signal wave pattern from the following PCM terminals:

Fig 1: Identifying PCM Wiring Harness Side Connector Terminals
Courtesy of MAZDA MOTORS CORP.
- PCM terminal 3A (FP2)
- PCM terminal 3D (RP2)
- If the signal wave pattern can be verified, inspect the following and repair or replace the malfunctioning part.
  - Mass air flow sensor
  - Throttle position sensor
  - Intake air temperature sensor
Verify that there is output of the fuel injector (FP2, RP2) control signal wave pattern from the following PCM terminals when the PID RPM is 6.250 RPM or more.
- PCM terminal 3A (FP2)
- PCM terminal 3D (RP2)
  - If the signal wave pattern cannot be verified, perform the following inspections and repair or replace the malfunctioning location.
Fuel injector (FP2)
- Open or short circuit in the wiring harness between PCM terminal 3A and fuel injector (FP2) terminal B
- Open circuit in the wiring harness between fuel injector (FP2) terminal A and main relay terminal C
- Fuel injector short circuit (FP2)
  
  Fig 2: Identifying Fuel Injector & Main Relay Connector Terminals
  Courtesy of MAZDA MOTORS CORP.
Fuel injector (RP2)
- Open or short circuit between the PCM terminal 3D-fuel injector (RP2) terminal B
- Open circuit in the wiring harness between fuel injector (RP2) terminal A and main relay terminal C
- Open circuit in the fuel injector (RP2) internal circuit