P1DE6-450

DTC Code	DTC Name
P1DE6-450	Hydrogen Tank Temperature Sensor Correlation

DESCRIPTION

The hydrogen system of the FC system feeds the FC stack with hydrogen, so that the FC stack can generate power. The hydrogen tank temperature sensor calculates a remaining amount of the hydrogen in the tank, and then corrects the calculation value with the temperature inside the tank so that a precise remaining amount of hydrogen can be output to the meter.

The remaining amount of hydrogen is used when the hydrogen tanks are refilled.

If the temperature difference between the 2 hydrogen tanks has deviated from an estimated difference under specified conditions, the FC control ECU interprets that there are characteristic deviations in either one of the temperature sensors, and sets this DTC.

For the circuit diagram, refer to DTC P1DB1-450.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate
P1DE6-450	Hydrogen Tank Temperature Sensor Correlation	When the FC system is activated a few hours later after the power switch is turned off, a difference between the temperatures of No. 1 and No. 2 hydrogen tank assemblies is above a threshold. (3 times)	No. 1 hydrogen tank assembly No. 2 hydrogen tank assembly	Master Warning Light: Comes on

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

P1DE6-450

Hydrogen Tank Temperature Sensor Correlation

When the FC system is activated a few hours later after the power switch is turned off, a difference between the temperatures of No. 1 and No. 2 hydrogen tank assemblies is above a threshold.

(3 times)

No. 1 hydrogen tank assembly
No. 2 hydrogen tank assembly

Master Warning Light: Comes on

Detection timing
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	-	○	-	-	-	-

Tech Tips

The Smoothed Values of Hydrogen Tank 1 and 2 Temperatures in the Data List are useful when troubleshooting.

Related Data List
DTC No.	Data List
P1DE6-450	Smoothed Value of Hydrogen Tank 1 Temperature Smoothed Value of Hydrogen Tank 2 Temperature

Tech Tips

After filling, a hydrogen tank temperature may increase.

The following items can be helpful when performing repairs:

Data List (Air Conditioner)

Ambient Temp Sensor

Common Data List items for FC inspection

Vehicle Speed
Shift Sensor Shift Position
Accelerator Degree
Ready
FC Mode
FC Intermittent Operation
FC Voltage before Boosting
FC Current
Target Low-range Hydrogen Pressure
Smoothed Value of Low-range Hydrogen Pressure
Target Hydrogen Pump Revolution
Hydrogen Pump Revolution
Target FC Stack Air Pressure (FC Stack Inlet)
Smoothed Value of FC Stack Air Pressure (FC Stack Inlet)
Target Mass Air Flow Value
Mass Air Flow Value
Target Air Compressor Revolution
Air Compressor Revolution
Target FC Stack Coolant Temperature (FC Stack Outlet)
Smoothed Value of FC Stack Coolant Temperature (FC Stack Outlet)
Exhaust Drainage Valve Driving Request

CAUTION / NOTICE / HINT

Note

When the vehicle is parked with the power switch off, if the FC control ECU judges that the FC stack temperature will go below 0°C (32°F), it activates the FC air compressor, hydrogen pump and FC cooling water pump for a maximum of 180 seconds and drains water from the FC stack assembly. When performing inspection or repairs with the power switch off (not on (IG) or on (READY)), disconnect the cable from the negative (-) auxiliary battery terminal before performing work (If the auxiliary battery voltage is needed to conduct inspection, warm up the FC system beforehand).

Tech Tips

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.

Turn the power switch off and leave the vehicle for at least 8 hours.
Check that a temperature difference between the Smoothed Value of Hydrogen Tank 1 and 2 Temperatures is less than 15°C (59°F) (it is almost equal to an ambient temperature at the time).

PROCEDURE

CLEAR DTC

Note

The freeze frame data is cleared when DTCs are cleared. Be sure to make a note of necessary data in advance.

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / FC / Trouble Codes.
Clear the DTCs.

Powertrain > FC > Clear DTCs

Turn the power switch off and wait for 3 minutes or more.

Result

Proceed to
NEXT

READ VALUE USING GTS (SMOOTHED VALUE OF HYDROGEN TANK 1 TEMPERATURE, SMOOTHED VALUE OF HYDROGEN TANK 2 TEMPERATURE)

Turn the power switch off and leave the vehicle for at least 8 hours.
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.

Enter the following menus: Powertrain / FC / Data List / Smoothed Value of Hydrogen Tank 1 Temperature, Smoothed Value of Hydrogen Tank 2 Temperature

Powertrain > FC > Data List

Tester Display
Smoothed Value of Hydrogen Tank 1 Temperature
Smoothed Value of Hydrogen Tank 2 Temperature

Read the value displayed on the GTS.

OK

Difference between the Smoothed Value of Hydrogen Tank 1 and 2 Temperatures is less than 15°C (59°F).

OK
Difference between the Smoothed Value of Hydrogen Tank 1 and 2 Temperatures is less than 15°C (59°F).

Measure the ambient temperature using a thermometer.

Result

Result		Proceed to
OK		A
NG	Difference between the "Smoothed Value of Hydrogen Tank 1 Temperature" and the ambient temperature is more than 10°C (50°F)	B
NG	Difference between the "Smoothed Value of Hydrogen Tank 2 Temperature" and the ambient temperature is more than 10°C (50°F)	C

Turn the power switch off.

A

CHECK FOR INTERMITTENT PROBLEMS Click here

B

REPLACE NO. 1 HYDROGEN TANK ASSEMBLY Click here

C

REPLACE NO. 2 HYDROGEN TANK ASSEMBLY Click here

FC CONTROL SYSTEM, Diagnostic DTC:P1DE6-450