DTC P0473-00: Exhaust Gas Pressure Sensor Circuit High Input: Notes

DTC P0473:00 DETECTION CONDITION AND POSSIBLE CAUSE

DTC P0473:00	Exhaust gas pressure sensor circuit high input
DETECTION CONDITION	If the input voltage at the PCM terminal 1BF is more than 4.9 V for 5 s, the PCM determines that the exhaust gas pressure sensor circuit has a malfunction. MONITORING CONDITIONS Battery voltage: 8 V or more 0.5 s have elapsed after the ignition was switched ON (engine off or on) 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	Inhibits the EGR control.
POSSIBLE CAUSE	Turbocharger malfunction Exhaust gas pressure sensor connector or terminals malfunction PCM connector or terminals malfunction Short to power supply in wiring harness between exhaust gas pressure sensor terminal B and PCM terminal 1BF Exhaust gas pressure sensor power supply circuit and signal circuit are shorted to each other Open circuit in wiring harness between exhaust gas pressure sensor terminal C and PCM terminal 1BQ Exhaust gas pressure sensor malfunction PCM malfunction
Courtesy of MAZDA MOTORS CORP.