DTC P1D2C-450: FC Stack Coolant Temperature Sensor (FC Stack Outlet) Circuit Low; DTC P1D2D-450: FC Stack Coolant Temperature Sensor (FC Stack Outlet) Circuit High [06/2015 - ]: Description
The water temperature sensor (for FC stack outlet side) built into the FC stack assembly monitors the FC stack coolant that absorbs heat emitted during power generation by the FC stack. The water temperature sensor (for FC stack outlet side) has a built-in thermistor with a resistance that varies according to the temperature of the FC stack coolant. When the FC stack coolant temperature is low, the resistance of the thermistor increases. When the temperature is high, the resistance drops. These variations in resistance are transmitted to the FC control ECU as voltage changes.
The water temperature sensor (for FC stack outlet side) is connected to the FC control ECU, and a power voltage of 5 V is supplied from the WTO terminal of the FC control ECU to the sensor via resistor R. Since resistor R and the sensor are connected in series, resistance varies as an FC stack coolant temperature changes, and potential of the WTO terminal also varies.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate |
|---|---|---|---|---|
| P1D2C-450 | FC Stack Coolant Temperature Sensor (FC Stack Outlet) Circuit Low | If the +B voltage is not low when the power switch is turned on (IG), FC Stack Coolant Temperature Sensor (FC Stack Outlet) Voltage remains at less than 0.1 V for more than 3 seconds. (1 trip detection logic) |
|
Master Warning Light: Comes on |
| P1D2D-450 | FC Stack Coolant Temperature Sensor (FC Stack Outlet) Circuit High | If the +B voltage is not low when the power switch is turned on (IG), FC Stack Coolant Temperature Sensor (FC Stack Outlet) Voltage remains at more than 4.9 V for more than 3 seconds. (1 trip detection logic) |
|
Master Warning Light: Comes on |
| Vehicle Condition | FC shutdown (power switch on (IG)) |
FC startup process | FC intermittent operation | FC is generating power (vehicle is in stationary) |
FC is generating power (vehicle is traveling) |
FC shutdown process |
|---|---|---|---|---|---|---|
| Data List "FC Mode" |
FC Shutdown | FC Startup Process | FC Working | FC Shutdown Process | ||
| Data List "FC Intermittent Operation" |
OFF | ON | OFF | OFF | ||
| DTC Detection | ◦ | ◦ | ◦ | ◦ | ◦ | - |
| DTC No. | Data List |
|---|---|
| P1D2C-450 |
|
| P1D2D-450 |