| DETECTION CONDITION |
- The PCM monitors the ECT sensor signal. If the PCM detects that the ECT sensor voltage is below 0.2 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 |
- Engine overheating (cooling system malfunction)
- ECT sensor connector or terminals malfunction
- ECT sensor malfunction
- Short to ground in wiring harness between ECT sensor terminal A and PCM terminal 2AH
- PCM connector or terminals malfunction
- ECT sensor signal circuit and ground circuit are shorted to each other
- PCM malfunction
|
 Courtesy of MAZDA MOTORS CORP.
|