Fuel injector (FP1, RP1) operation inspection

WARNING: This page is about a different car, the 2005 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.

Warm up the engine and idle it.
Inspect the following PCM output wave pattern. (See PCM INSPECTION .)

Fig 1: Identifying Wiring Harness-Side Connector Terminal (PCM)
Courtesy of MAZDA MOTORS CORP.
- PCM terminal 2M (FP1)
- PCM terminal 2J (RP1)
If a normal condition of the PCM wave pattern cannot be verified, inspect the following and repair or replace the malfunctioning part.

Fig 2: Identifying Wiring Harness-Side Connector Terminal (Fuel Injector)
Courtesy of MAZDA MOTORS CORP.

Fuel injector (FP1)
- Short circuit of the wiring harness, connector between fuel injector (FP1) terminal A and main relay terminal C
- Short circuit of the wiring harness between PCM terminal 2M and fuel injector (FP1) terminal B
- Short circuit of the fuel injector (FP1) internal circuit
Fuel injector (RP1)
- Short circuit of the wiring harness, connector between fuel injector (RP1) terminal A and main relay terminal C
- PCM terminal 2J-fuel injector (RP1) terminal B
- Short circuit of the fuel injector (RP1) internal circuit