| DETECTION CONDITION |
- The PCM monitors the ECT sensor signal. If the PCM detects that the ECT sensor voltage is above 4.6 V
for 5 s
, the PCM determines that the ECT sensor circuit has a malfunction.
Diagnostic support note
- This is a continuous monitor (engine cooling system).
- The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle.
- FREEZE FRAME DATA (Mode 2)/Snapshot data is available.
- The DTC is stored in the PCM memory.
|
| FAIL-SAFE FUNCTION |
- Fixes the water temperature for the engine control at 40 °C {104 °F}
, and for the idle air control at 80 °C {176 °F}
.
- Operates the cooling fan (high speed rotation).
- Inhibits the variable tumble control.
- Inhibits the fuel cut control during shift change.
|
| POSSIBLE CAUSE |
- ECT sensor connector or terminals malfunction
- ECT sensor malfunction
- PCM connector or terminals malfunction
- Short to power supply in wiring harness between ECT sensor terminal A and PCM terminal 2AH
- Open circuit in wiring harness between the following terminals:
- ECT sensor terminal A-PCM terminal 2AH
- ECT sensor terminal B-PCM terminal 2AV
- PCM malfunction
|
 Courtesy of MAZDA MOTORS CORP.
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