Mazda MX-5 Miata Sport 2007 Manual page 1025

REMOVAL/INSTALLATION [LF] .)
VOLTAGE INSPECTION
1. Remove the MAF/IAT sensor without disconnecting the MAF/IAT sensor connector.
2. Turn the ignition switch to the ON position.
3. As the air gradually approaches the MAF detection part of the MAF/IAT sensor, verify that the MAF
sensor output voltage (M-MDS PID: MAF) varies.
If it cannot be verified even though the related wiring harnesses have no malfunction, replace the

MAF/IAT sensor. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT)
SENSOR REMOVAL/INSTALLATION [LF] .)
CIRCUIT OPEN/SHORT INSPECTION
1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [LF] .)
2. Inspect the following wiring harness for open or short circuit (continuity Inspection).
Open Circuit
If there is no continuity, there is an open circuit, Repair or replace the wiring harness.

MAF/IAT sensor terminal A and PCM main relay

MAF/IAT sensor terminal B and PCM terminal 1P

MAF/IAT sensor terminal C and PCM terminal 1AK

Short Circuit
If there is continuity, there is a short circuit. Repair or replace the wiring harness.

MAF/IAT sensor terminal A and body ground

MAF/IAT sensor terminal B and power supply

MAF/IAT sensor terminal C and power supply

MAF/IAT sensor terminal C and body ground

2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Engine Control System - MX-5 Miata