DTC P0117-00: ECT Sensor No.1 Circuit Low Input: Notes
DETECTION CONDITION AND POSSIBLE CAUSE
| DTC P0117:00 |
ECT sensor No.1 circuit low input |
| DETECTION CONDITION |
- The PCM monitors the ECT sensor No.1 signal. If the PCM detects that the ECT sensor No.1 voltage at the PCM terminal 1AK is below 0.2 V
for 5 s
, the PCM determines that the ECT sensor No.1 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 fuel cut control during shift change.
|
| POSSIBLE CAUSE |
- Engine overheating (cooling system malfunction)
- ECT sensor No.1 connector or terminals malfunction
- ECT sensor No.1 malfunction
- Short to ground in wiring harness between ECT sensor No.1 terminal A and PCM terminal 1AK
- PCM connector or terminals malfunction
- ECT sensor No.1 signal circuit and ground circuit are shorted to each other
- PCM malfunction
|
|
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CAUTION:
- Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.
RELATED PIDS
| Monitor item (Definition) |
Unit/Condition |
Condition/Specification (Reference) |
| ECT |
°C, °F |
|
| V |
- ECT is 20°C {68°F}: approx. 3.10 V
- ECT is 40°C {104°F}: approx. 2.16 V
- ECT is 60°C {140°F}: approx. 1.40 V
- ECT is 80°C {176°F}: approx. 0.87 V
- ECT is 100°C {212°F}: approx. 0.54 V
|