DTC P0137-00: Ho2S Circuit Low Input: Notes
DETECTION CONDITION AND POSSIBLE CAUSE
| DTC P0137:00 |
HO2S circuit low input |
| DETECTION CONDITION |
- The PCM monitors input voltage from HO2S. If the input voltage from the HO2S is below -1.15 V
or HO2S bias voltage is below 1.3 V for 5 s
or the voltage from the HO2S is below -0.15 V for 25 s
while the HO2S is active, the PCM determines that the HO2S circuit input is low.
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.
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| FAIL-SAFE FUNCTION |
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| POSSIBLE CAUSE |
- HO2S connector or terminals malfunction
- Short to ground in wiring harness between HO2S terminal A and PCM terminal 2AI
- PCM connector or terminals malfunction
- Open circuit in wiring between the following terminals:
- HO2S terminal A-PCM terminal 2AI
- HO2S terminal B-PCM terminal 2AG
- HO2S malfunction
- PCM malfunction
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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
|
| ***2S12 |
V |
- Idle (after warm up): 0-1.0 V
- Deceleration fuel cut (accelerator pedal released from engine speed of 4,000 rpm or more): approx. 0 V
|