DTC P0193-00: Fuel Pressure Sensor Circuit High Input: Notes

DTC DETECTION DESCRIPTION

DTC P0193:00
DETECTION CONDITION	If the input voltage at the PCM terminal 1CA is more than 4.86 V for 5 s, the PCM determines that the fuel pressure sensor circuit is high. Diagnostic support note This is a continuous monitor (CCM). The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle. FREEZE FRAME DATA/Snapshot data is available. DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	Stops high pressure fuel pump control Limits intake air amount
POSSIBLE CAUSE	Fuel pressure sensor connector or terminals malfunction PCM connector or terminals malfunction Fuel pressure sensor malfunction Short to power supply in wiring harness between fuel pressure sensor terminal B and PCM terminal 1CA Open circuit in wiring harness between the following terminals: Fuel pressure sensor terminal C-PCM terminal 1BJ Fuel pressure sensor terminal B-PCM terminal 1CA Fuel pressure sensor terminal A-PCM terminal 1CB PCM malfunction

Fig 1: Fuel Pressure Sensor Circuit Diagram

Courtesy of MAZDA MOTORS CORP.

CAUTION:

• Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.

PARTS DESCRIPTION

Item	Definition	Unit	Condition/Specification
FUEL_PRES	Fuel pressure input from fuel pressure sensor	KPa {MPA}, mBar {BAR}, psi, in H20	Displays fuel pressure
	Fuel pressure sensor voltage	V	Fuel pressure is 3.0 MPa {31 kgf/cm2 , 435 psi}: Approx. 0.92 V Fuel pressure is 4.8 MPa {49 kgf/cm2 , 696 psi}: Approx. 1.17 V