Fig. 14: IAT Sensor & ECT Sensor - Circuit Diagram
Courtesy of MAZDA MOTORS CORP.
Input Signal System Inspection For Thermistor Type
1. When an irregular signal is detected, measure the #1 PCM terminal voltage.
If the #1 terminal voltage and the M-MDS or equivalent monitor voltage are the same, proceed to
the next step.
If there is a difference of
0.5 V or more
, inspect the following points concerning the PCM
connector:
Female terminal opening 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
0.5 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
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
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