DTC P0030: Notes

DTC P0030 DETECTION CONDITION AND POSSIBLE CAUSES

DTC P0030	Front HO2S heater control circuit problem
DETECTION CONDITION	OBD system monitors the output signal voltage from oxygen sensor which is in proportion to the element impedance of oxygen sensor. If the output signal voltage is not between 0.75 V and 1.5 V after specified time from engine start, heater performance is considered failed. Monitoring condition 74 s elapsed from engine start Battery voltage: 10-18 V Diagnostic support note This is an intermittent monitor (HO2S heater). The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle. FREEZE FRAME DATA is available. DTCs are stored in the PCM memory.
POSSIBLE CAUSE	Front HO2S heater malfunction Connector or terminal malfunction Open circuit in wiring harness between front HO2S heater terminal 2D and PCM terminal 4AD Short to ground in the wiring harness between front HO2S heater terminal 2D and PCM terminal 4AD Short to power supply in the wiring harness between front HO2S heater terminal 2D and PCM terminal 4AD Open circuit in the wiring harness between front HO2S heater terminal 1B and PCM terminal 2G PCM malfunction

DTC P0030

Front HO2S heater control circuit problem

DETECTION CONDITION

OBD system monitors the output signal voltage from oxygen sensor which is in proportion to the element impedance of oxygen sensor. If the output signal voltage is not between 0.75 V and 1.5 V after specified time from engine start, heater performance is considered failed.

Monitoring condition

Diagnostic support note

This is an intermittent monitor (HO2S heater).
The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
FREEZE FRAME DATA is available.
DTCs are stored in the PCM memory.

POSSIBLE CAUSE

Front HO2S heater malfunction
Connector or terminal malfunction
Open circuit in wiring harness between front HO2S heater terminal 2D and PCM terminal 4AD
Short to ground in the wiring harness between front HO2S heater terminal 2D and PCM terminal 4AD
Short to power supply in the wiring harness between front HO2S heater terminal 2D and PCM terminal 4AD
Open circuit in the wiring harness between front HO2S heater terminal 1B and PCM terminal 2G
PCM malfunction