DTC P0237-00: Boost Pressure Sensor Circuit Low Input: Notes

DTC P0237-00 PCM (SKYACTIV-G 2.5T) DETECTION CONDITION AND POSSIBLE CAUSE

DTC P0237-00	BOOST PRESSURE SENSOR CIRCUIT LOW INPUT
DETECTION CONDITION	The PCM monitors the input voltage from the boost pressure sensor. If the input voltage at the PCM terminal 2AS is below 0.28 V for 5 s, the PCM determines that the boost pressure sensor circuit has a malfunction. 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	Stop the supercharging pressure control. (fully open the wastegate valve)
POSSIBLE CAUSE	Boost pressure sensor/boost air temperature sensor connector or terminals malfunction PCM connector or terminals malfunction Short to ground in wiring harness between the following terminals: Boost pressure sensor/boost air temperature sensor terminal C-PCM terminal 2AE Boost pressure sensor/boost air temperature sensor terminal D-PCM terminal 2AS Boost pressure sensor signal circuit and ground circuit are shorted to each other Boost pressure sensor malfunction PCM malfunction
Courtesy of MAZDA MOTORS CORP.

CAUTION:

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

RELATED PID DATA

ITEM (DEFINITION)	UNIT/CONDITION	DEFINITION	CONDITION/SPECIFICATION (REFERENCE)
INLET_PRES	KPa {MPA}, mBar {BAR}, psi, in H20	Air intake pipe pressure input from boost pressure sensor	Displays air intake pipe pressure
INLET_PRES	V	Boost pressure sensor voltage	Ignition switched ON (engine off) (boost pressure:101 kPa {1.03 kgf/cm ² , 14.6 psi}): Approx. 4.12 V Idle (after warm up) (boost pressure: 33 kPa {0.34 kgf/cm ² , 4.8 psi}): Approx. 1.9 V Racing (engine speed is 2, 000 RPM) (MAP: 26 kPa {0.27 kgf/cm ² , 3.8 psi}): Approx. 1.23 V