Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2006 Mazda MX-5 Miata BaseFACTORY OEM SERVICE PROCEDURE

DTC P0117: Notes

DETECTION CONDITION AND POSSIBLE CAUSE (DTC P0117)

DTC P0117

ECT sensor circuit low input

DETECTION CONDITION

The PCM monitors the ECT sensor signal at PCM terminal 2AH. If the PCM detects the ECT sensor voltage below 0.2 V , the PCM determines that the ECT sensor circuit has malfunction.

Diagnostic support note

This is a continuous monitor (Engine cooling system).
The MIL illuminates if the PCM detects the above malfunction condition during first drive cycle.
PENDING CODE is available if the PCM detects the above malfunction condition.
FREEZE FRAME DATA is available.
The DTC is stored in the PCM memory.

POSSIBLE CAUSE

ECT sensor malfunction
Connect or terminal malfunction
Short to ground in wiring harness between ECT sensor terminal A and PCM terminal 2AH
Short each wiring harness ECT sensor signal circuit and ECT sensor ground circuit
PCM malfunction

Courtesy of MAZDA MOTORS CORP.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.