DTC P1D8C-450: FC Stack Air Temperature Sensor (FC Stack Inlet) Circuit Low; DTC P1D8D-450: FC Stack Air Temperature Sensor (FC Stack Inlet) Circuit High [06/2015 - ]: Description
The FC gas temperature sensor is provided on the FC air compressor with motor assembly, and is used to monitor air temperature cooled down by the intercooler. The FC gas temperature sensor has a built-in thermistor with a resistance that varies according to the temperature of the intake air. When the intake air 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 FC gas temperature sensor is connected to the FC control ECU, and a power voltage of 5 V is supplied from the ATIC 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 intake air temperature changes, and potential of the ATIC terminal also varies.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate |
|---|---|---|---|---|
| P1D8C-450 | FC Stack Air Temperature Sensor (FC Stack Inlet) Circuit Low | If the +B voltage is not low when the power switch is turned on (IG), FC Stack Air Temperature Sensor (FC Stack Inlet) Voltage remains at less than 0.1 V for more than 3 seconds. (1 trip detection logic) |
|
Master Warning Light: Comes on |
| P1D8D-450 | FC Stack Air Temperature Sensor (FC Stack Inlet) Circuit High | If all of the following conditions are met, and FC Stack Air Temperature Sensor (FC Stack Inlet) Voltage remains at more than 4.95 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 | ◦ | ◦ | ◦ | ◦ | ◦ | - |
| 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 | - | ◦ | ◦ | ◦ | ◦ | - |
HINT:
By accessing the "FC Mode" and "FC Intermittent Operation" in the freeze frame data, the FC system condition at the time the malfunction occurred can be checked.
| DTC No. | Data List |
|---|---|
| P1D8C-450 |
|
| P1D8D-450 |
The following items can be helpful when performing repairs:
Data List
- Smoothed Value of Intake Air Temperature
- FC Mode