DTC P2237-00: A/F Sensor Positive Current Control Circuit Open: Notes

DETECTION CONDITION AND POSSIBLE CAUSE

DTC P2237:00	A/F sensor positive current control circuit open
DETECTION CONDITION	The PCM monitors A/F sensor positive current control circuit voltage. If the voltage is between 2.2 V  and 2.4 V  while the engine is running, the PCM determines that the A/F sensor positive current control circuit is open. Diagnostic support note  This is a continuous monitor (A/F sensor, HO2S). The check engine light 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.
FAIL-SAFE FUNCTION	Fixes the duty value of the A/F sensor heater. Stops the fuel feedback control.
POSSIBLE CAUSE	A/F sensor connector or terminals malfunction PCM connector or terminals malfunction Open circuit in wiring harness between A/F sensor terminal B and PCM terminal 1AG A/F sensor malfunction PCM malfunction

CAUTION:

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

RELATED PIDS

Monitor item (Definition)	Unit/Condition	Condition/Specification (Reference)
VSS	KPH, MPH	Displays the vehicle speed
RPM	RPM	Displays the engine speed
O2S11	A	Idle (after warm up): approx. --39 μA  Deceleration fuel cut (accelerator pedal released from engine speed of 4,000 rpm or more): approx. 3.84 mA