DTC P0030, P0050: A/F Sensor Heater Control Circuit: Notes

DTC P0030, P0050 (MZI-3.7)

DTC P0030 DTC P0050	P0030: A/F sensor (RH) heater control circuit  P0050: A/F sensor (LH) heater control circuit
DETECTION CONDITION	P0030 indicated that A/F sensor (RH) heater circuit has a malfunction P0050 indicated that A/F sensor (LH) heater circuit has a malfunction The PCM monitors the heater in the air fuel ratio (A/F) sensor (RH/LH) for correct operation. The PCM controls the heater on/off duty cycle to maintain calibrated temperature. The test fails when the sensor does not warm up to the required temperature in the calibrated amount of time. The test also fails when the PCM is not able to maintain the required temperature after the sensor is warm.
POSSIBLE CAUSE	A/F sensor loose connection, and damaged or corroded terminals Exhaust temperature significantly higher than expected P0300 Short to power supply in wiring harness between A/F sensor (RH) terminal E and PCM terminal 2J Open circuit in wiring harness between the following terminals: A/F sensor (RH) terminal E-PCM terminal 2J A/F sensor (RH) terminal F-PCM terminal 2AG A/F sensor (RH) terminal H-PCM terminal 2AC P0050 Short to power supply in wiring harness between A/F sensor (LH) terminal E and PCM terminal 2J Open circuit in wiring harness between the following terminals: A/F sensor (LH) terminal E-PCM terminal 2E A/F sensor (LH) terminal F-PCM terminal 2AK A/F sensor (LH) terminal H-PCM terminal 2AE Damaged A/F sensor (RH/LH) PCM malfunction
Courtesy of MAZDA MOTORS CORP.