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HOMESERVICE MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (AJ]DTC P0137, P0157 [AJ]NOTES
2008 Mazda 6 s Sport, 4D Hatchback, Standard

DTC P0137, P0157 [AJ]: Notes

2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Notes
DTC P0137, P0157 [AJ] DETECTION CONDITION AND POSSIBLE CAUSES

DTC P0137
DTC P0157		 HO2S (RR) circuit low input
HO2S (LR) circuit low input
DETECTION CONDITION 
  • The PCM monitors input voltage from rear HO2S. If the input voltage from the rear HO2S sensor is below 0.1 V  for 41.6 s  the PCM determines that circuit input is low.

    MONITORING CONDITIONS 

    • HO2S, HO2S heater and TWC repair verification drive mode
    • Following conditions are met.
      • Engine speed is above 1,500 RPM  .
      • Engine coolant temperature above 70 °C {158 °F}  .
      • Fuel injector control in rear HO2S closed loop control
  • The PCM monitors the input voltage from the rear HO2S when the following conditions are met. Under the following monitoring conditions, if the input voltage from the rear HO2S does not even exceed 0.1 V  though the short term fuel trim is controlled up to 25%  for 9.6 s  , the PCM determines that sensor circuit input is low.

    MONITORING CONDITIONS 

    • HO2S, HO2S heater and TWC repair verification drive mode
    • Following conditions are met for above 32 s 
      • Engine speed is above 1,500 RPM  .
      • Engine coolant temperature is above 70 °C {158 °F}  .

Diagnostic support note 
  • This is a continuous monitor (HO2S).
  • MIL illuminates if the PCM detects the above malfunctioning 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 conditions during the first drive cycle.
  • FREEZE FRAME DATA is available.
  • DTC is stored in the PCM memory.
POSSIBLE CAUSE 
  • HO2S (RR) malfunction
  • Short to ground in wiring between HO2S (RR) terminal A and PCM terminal 2AG
  • Open circuit between HO2S (RR) terminal A and PCM terminal 2AG
  • Open circuit between HO2S (RR) terminal B and PCM terminal 2AY
  • HO2S (LR) malfunction
  • Short to ground in wiring between HO2S (LR) terminal A and PCM terminal 2AH
  • Open circuit between HO2S (LR) terminal A and PCM terminal 2AH
  • Open circuit between HO2S (LR) terminal B and PCM terminal 2BA
  • PCM malfunction
G04324187
RENDER: 1.0x

NO RELATED

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
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