What does code P1116 mean?

Q: What does code P1116 mean?

ECT Sensor Circuit Out Of Self Test Range. P1116 on Mazda vehicles means the engine coolant temperature (ECT) sensor circuit failed a rationality self-test during a specific operating window, so the powertrain control module (PCM) cannot trust the coolant temperature signal. The computer compares the ECT reading against expected warm-up behavior and flags the code when the signal stays outside the plausible range for too long.

DTC codes / Mazda codes / P1116

P1116 · MazdaECT Sensor Circuit Out Of Self Test Range

P1116 on Mazda vehicles means the engine coolant temperature (ECT) sensor circuit failed a rationality self-test during a specific operating window, so the powertrain control module (PCM) cannot trust the coolant temperature signal. The computer compares the ECT reading against expected warm-up behavior and flags the code when the signal stays outside the plausible range for too long.

SystemPowertrain

Code typeMazda specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

Guidance is general and written for Mazda vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.