Mazda MX-5 Miata Sport 2007 Manual page 1959

2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
POSSIBLE CAUSE
No signal from CKP sensor due to sensor,

related wire or wrong installation
Vacuum leakage

Engine overheating

Low engine compression

Erratic signal to ignition coil

Poor fuel quality

PCV valve malfunction

Air cleaner restriction

Restriction in exhaust system

Electrical connector disconnection

Open or short circuit in fuel pump body and

related wiring harness
No battery power supply to PCM or poor

GND
Inadequate fuel pressure

Fuel pump body mechanical malfunction

Fuel leakage from fuel injector

Fuel injector clogging

Ignition coil malfunction

Improper air/fuel mixture ratio control

Improper valve timing

Improper operation variable valve timing

control system
Immobilizer system and/or circuit

malfunction
Immobilizer system operating property.

(Ignition key is not registered.)
Pressure regulator malfunction (built-in fuel

pump unit)
WARNING:
The following DIAGNOSTIC PROCEDURE
TABLE contains the fuel system diagnosis
and repair procedures. Read the following
warnings before servicing the fuel system:
Fuel vapor is hazardous. It can easily

ignite, causing serious injury and
damage. Always keep sparks and
flames away from fuel.