Mazda MX-5 Miata Sport 2007, Manual

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POSSIBLE CAUSE

Idle learning of electronic throttle control
system is not completed

EGR valve malfunction

Erratic or no signal from CMP sensor

Low engine compression

Improper valve timing

Improper variable valve timing control system
operation

Erratic signal from CKP sensor

Improper air/fuel mixture ratio control
operation (abnormal signal form MAF sensor
or HO2S)

Open or short circuit in PCM GND circuit

Poor fuel quality

PCV valve malfunction

Air cleaner restriction

Restriction in exhaust system

Disconnected electrical connectors

Inadequate fuel pressure

Fuel pump body mechanical malfunction

Improper load signal input

Fuel line restriction or clogging

Improper fuel injection control operation

Fuel leakage from fuel injector

Fuel injector clogging

Engine overheating

Vacuum leakage

Pressure regulator malfunction (built-in fuel
pump unit)
WARNING:
The following DIAGNOSTIC PROCEDURE TABLE
contains fuel system diagnosis and repair
procedures. Read 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.

Fuel line spills and leakage are dangerous.
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:42:09 PM Page 48 © 2005 Mitchell Repair Information Company, LLC.