Mazda RX-8 Workshop Manual page 698

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2011 - RX-8 - Engine
NO.6 CRANKS NORMALLY BUT WILL NOT START [13B-MSP]
6 CRANKS NORMALLY BUT WILL NOT START
DESCRIPTION
The starter cranks the engine at normal speed but the engine will not run.
Refer to the symptom troubleshooting "No.5 Engine stalls" if this symptom
appears after engine stall.
The fuel is in the tank.
The battery is in normal condition.
No battery power supply to PCM
Open PCM GND or vehicle body GND
Air cleaner restriction
Air leakage from intake-air system
Vacuum leakage
Improper operation of drive-by-wire control system
Drive-by-wire control system operates in fail-safe mode (abnormal
accelerator position and TP signal to PCM)
Poor fuel quality
Open or short circuit in fuel pump body and related wiring harness
Inadequate fuel pressure
Fuel pump relay malfunction (stuck open)
Fuel pump mechanical malfunction
Pressure regulator (integrated in fuel pump unit) malfunction
Fuel injector malfunction (leakage, clogging, improper injection amount)
Open or short in fuel injector control signal circuit