Specifications

ON-BOARD DIAGNOSTIC [LF]
01-02–10
P0126 Coolant thermostat stuck open
• If the ECT signal never exceeds 71 °C {160 °F} after engine start for specified period, PCM determines that the
coolant thermostat is stuck open.
MONITORING CONDITIONS
— IAT: above –10 °C {14 °F}
— Vehicle speed: over 6 km/h {3.7 mph}
P0128 Coolant thermostat stuck open
• PCM monitors MAF, IAT, VSS and EAT signals and calculate radiator’s heat radiation ratio while following
monitoring conditions are met. If calculated value exceeds threshold, PCM determines that the coolant
thermostat is stuck open.
MONITORING CONDITIONS
— IAT: above -10°C {14 °F}
— ECT at engine start: below 36 °C {97 °F}
— Difference between ECT at engine start and minimum IAT: below 6 °C {10.8 °F}
— Vehicle speed: over 30 km/h {18.6 mph}
P0130 Front HO2S circuit problem
• The PCM monitors the front HO2S impedance when under the front HO2S heater control. If the impedance is
more than 500 ohms, the PCM determines that there is a front HO2S circuit problem.
P0131 Front HO2S circuit low input
• The PCM monitors the input voltage from the front HO2S and the front HO2S output current when the engine is
running. If the input voltage is less than 1.8 V or the output current is less than –5 mA, the PCM determines
that the front HO2S circuit voltage is low.
P0132 Front HO2S circuit high input
• The PCM monitors the input voltage from the front HO2S and the front HO2S output current when the engine is
running. If the input voltage is more than 3.8 V or the output current is more than 5 mA, the PCM determines
that the front HO2S circuit voltage is high.
P0133 Front HO2S circuit problem
• The PCM monitors the peak differential value of oxygen sensor signal after A/F fluctuation being provided when
the following conditions are met. If the peak differential value is lower than the threshold value.
• The PCM determines that front HO2S circuit is slow.
MONITORING CONDITIONS
— HO2S heater, HO2S, and TWC Repair Verification Drive Mode
— Following conditions are met:
• Front HO2S heater monitor is completed.
• Fuel system loop status is closed loop fuel control.
— Engine speed: 1,750—3,500 rpm
— Charging efficiency: 25—63 % (at engine speed: 2,500 rpm)
— Intake air volume: 5—40 g/s
— Engine coolant temperature above 70 °C {158 °F}
P0134 Front HO2S no activity detected
• The PCM monitors the front HO2S element impedance when the following conditions are met. If the front
HO2S element impedance is 80 ohms or more, the PCM determines that front HO2S is not activated.
MONITORING CONDITIONS
— HO2S, HO2S heater and TWC Repair Verification Drive Mode
— Following conditions are met
• Time from engine start is above 30 s (ECT when engine start is 20 °C {68 °F}).
P0137 Rear HO2S circuit low input
• The PCM monitors input voltage from rear HO2S. If the input voltage from the rear HO2S is below 0.1 V for
35.2 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 is 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 20.5 % 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 20.8 s.
• Engine speed is above 1,500 rpm.
• Engine coolant temperature is above 70 °C {158 °F}.
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