DTC P0037 [L3]: Notes
DTC P0037 [L3] DETECTION CONDITIONS AND POSSIBLE CAUSES
| DTC P0037 |
Rear HO2S heater circuit low input |
| DETECTION CONDITION |
- The PCM monitors the rear HO2S heater output voltage at PCM terminal 2B. If the PCM turns the rear HO2S heater to off but the rear HO2S heater circuit voltage is below 5 V
for 2 s
, the PCM determines that the rear HO2S heater circuit has malfunction.
Diagnostic support note
- This is a continuous monitor (HO2S heater).
- 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.
- The DTC is stored in the PCM memory.
|
| POSSIBLE CAUSE |
- Rear HO2S malfunction
- Open circuit in the wiring harness between the ignition switch and rear HO2S terminal C
- Open circuit in the wiring harness between rear HO2S terminal D and PCM terminal 2B
- Short to ground in the wiring harness between rear HO2S terminal D and PCM terminal 2B
- Poor connection at the rear HO2S or the PCM connector
- PCM malfunction
|
|
|