Mazda MX-5 Miata Sport 2007 Manual page 2061

2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
connector:
Female terminal opening is loose.

Coupler (pin holder) damage

Pin discoloration (blackness)

Harness/pin crimp is loose or disconnected.

2. Measure the #2 sensor terminal voltage.
If there is a 0 V or more difference between the sensor and the M-MDS or equivalent voltages,

inspect the wiring harness for open or short circuits.
If the sensor and the M-MDS or equivalent voltages are the same, inspect the following points

concerning the sensor connector:
Female terminal opening is loose.

Coupler (pin holder) damage

Pin discoloration (blackness)

Harness/pin crimp is loose or disconnected.

If there are no problems, proceed to next investigation below.

Electrical Supply System Inspection For Variable Resistance Type 2
Confirm that the sensor #3 terminal is B+ .

If the measured voltage on the #3 terminal is B+ , inspect the following points on the sensor

connector.
If there is no problem, inspect for the following:

Female terminal opening is loose.

Coupler (pin holder) damage

Pin discoloration (blackness)

If the #3 terminal measures other than B+ , inspect the following:

Open or short circuit in wiring harness

Harness/pin crimp is loose or disconnected.

Thermistor Type (IAT Sensor and ECT Sensor)
2007 Mazda MX-5 Miata Sport