DTC P0037:00: Notes

DTC P0037:00	HO2S heater control circuit low input
DETECTION CONDITION	The PCM monitors the HO2S heater control voltage when the PCM turns the HO2S heater on. If the control voltage is less than 90 % of the battery voltage, the PCM determines that the HO2S heater control circuit voltage is low. Diagnostic support note This is an intermittent monitor (A/F sensor heater, 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 first drive cycle. FREEZE FRAME DATA (Mode 2)/Snapshot data is available. The DTC is stored in the PCM memory.
POSSIBLE CAUSE	HO2S connector or terminals malfunction HO2S heater malfunction Short to ground in wiring harness between the following terminals: HO2S terminal C-PCM terminal 2I HO2S terminal D-PCM terminal 2AB PCM connector or terminals malfunction Open circuit in wiring harness between the following terminals: HO2S terminal C-PCM terminal 2I HO2S terminal D-PCM terminal 2AB PCM malfunction