DTC P011A; Pcm ECT Sensor No. 1/No. 2 Performance Problem: Notes

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITION & POSSIBLE CAUSE

DTC P011A:00

ECT sensor No. 1/No. 2 performance problem

DETECTION CONDITION

Any one of the following conditions is met, the PCM detects a circuit/range performance problem:
- When the ECT sensor No. 2 detected temperature is approx. 25 °C {45 °F} higher than the ECT sensor No. 1 with the ignition switch is ON ⁽¹⁾.
  - When the ECT sensor No. 2 detected temperature is approx. -28 °C {-50 °F} less than the ECT sensor No. 1 with the ignition switch is ON ⁽¹⁾. (Without block heater) ⁽²⁾

Diagnostic support note

This is a continuous monitor (engine cooling system).
The check engine light illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle.
FREEZE FRAME DATA (Mode 2)/Snapshot data is available.
DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

Not applicable

POSSIBLE CAUSE

ECT sensor No. 1 connector or terminals malfunction
ECT sensor No. 2 connector or terminals malfunction
PCM connector or terminals malfunction
ECT sensor No. 1 malfunction
ECT sensor No. 2 malfunction
PCM malfunction

SYSTEM WIRING DIAGRAM

Not applicable

⁽¹⁾	Ignition switch is ON when 6 h or more have passed since the ignition was switched off.

⁽²⁾	Based on the output value from ECT sensor No. 1 when the engine is started, if the input heat quantity required to increase the engine coolant temperature 3 °C {5 °F} exceeds the threshold, PCM determines that the block heater is equipped and does not determine a malfunction.