DTC P0134, P0154: Notes

• PCM monitors input voltage from HO2S (Front) when the following monitoring conditions are met. If the input voltage from the front HO2S does not even exceed 0.55 V  though the short term fuel trim is controlled up to 25%  for 9.6 s ⁽¹⁾ /85 s ⁽²⁾  , PCM determines that sensor circuit is not activated.

  MONITORING CONDITIONS*1 

  • Drive mode 3
  • Following conditions are met
    • Time from engine start is above 50 s  at ECT at engine start 20 °C {68 °F} 
  • Front HO2S sensor voltage is above 0.1 V 

  MONITORING CONDITIONS*2 

  • Drive mode 3
  • Following conditions are met
    • Engine speed is above 1,500 rpm 
    • Engine coolant temperature is above 70 °C {158 °F} 

Diagnostic support note 

• This is an intermittent monitor (HO2S).
• 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 the first drive cycle.
• FREEZE FRAME DATA is available.
• DTC is stored in the PCM memory.

• HO2S (Front) deterioration
• HO2S heater (Front) malfunction
• Leakage exhaust system
• Open or short to ground circuit between HO2S terminal and PCM terminal
  • For P0134: HO2S (Front, RH) terminal A and PCM terminal 18
  • For P0154: HO2S (Front, LH) terminal A and PCM terminal 19
• Insufficient compression
• Engine malfunction