DTC P1D92-450: FC Stack Air Pressure Sensor (FC Stack Inlet) Circuit Low; DTC P1D93-450: FC Stack Air Pressure Sensor (FC Stack Inlet) Circuit High [06/2015 - ]: Description

Air that flows into the FC stack is compressed by the FC air compressor with motor assembly, and then cooled down by the intercooler. The FC stack inlet air pressure sensor (turbo pressure sensor) monitors pressure of the air, and converts it into a voltage.

The FC stack inlet air pressure sensor (turbo pressure sensor) measures pressure of the air flowing into the FC stack as absolute pressure, thus, it can measure the FC stack inlet air pressure without influence from changes in the atmospheric pressure due to altitude, etc.

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DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate
P1D92-450	FC Stack Air Pressure Sensor (FC Stack Inlet) Circuit Low	If the FC air compressor speed is more than 1000 rpm and FC Stack Air Pressure Sensor (FC Stack Inlet) Voltage remains at less than 0.40 V for more than 3 seconds. This malfunction detection is actuated if the +B voltage is not low. (1 trip detection logic)	FC stack inlet air pressure sensor (turbo pressure sensor) FC control ECU Wire harness or connector	Master Warning Light: Comes on
P1D93-450	FC Stack Air Pressure Sensor (FC Stack Inlet) Circuit High	If the +B voltage is not low when the power switch is turned on (IG), FC Stack Air Pressure Sensor (FC Stack Inlet) Voltage remains at more than 4.65 V for more than 3 seconds. (1 trip detection logic)	FC stack inlet air pressure sensor (turbo pressure sensor) FC control ECU Wire harness or connector	Master Warning Light: Comes on

DETECTION TIMING: P1D92-450

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	-	◦	-	◦	◦	-

DETECTION TIMING: P1D93-450

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.

RELATED DATA LIST

DTC No.	Data List
P1D92-450	FC Stack Air Pressure Sensor (FC Stack Inlet) Voltage
P1D93-450	FC Stack Air Pressure Sensor (FC Stack Inlet) Voltage

The following items can be helpful when performing repairs:

Data List

Smoothed Value of FC Stack Air Pressure (FC Stack Inlet)
Air Compressor Revolution
FC Mode

HINT:

If DTCs are found, read the "FC Stack Air Pressure Sensor (FC Stack Inlet) Voltage" in the Data List on a Techstream.

FC Stack Air Pressure Sensor (FC Stack Inlet) Voltage	Malfunction
Less than 0.40 V	Open in VAPF (5 V power supply) circuit Short in APFC circuit to ground Short in APFC circuit to GAPF (GND) circuit
Higher than 4.65 V	Short in VAPF circuit to APFC circuit Open in APFC circuit Open in GAPF (GND) circuit

HINT:

It is suspected that malfunctions, or open/short circuits have occurred in the FC stack inlet air pressure sensor (turbo pressure sensor).