Fuel Injector (FP1, RP1) 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.

Warm up the engine and idle it.
Inspect the following PCM output wave pattern:
- 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 1: PCM Connector Terminal Identification
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

Fig 2: Identifying Fuel Injector & Main Relay Connector Terminals
Courtesy of MAZDA MOTORS CORP.

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