Toyota Tacoma manuals

Toyota Corolla Repair Manual: Circuit description

Refer to dtc p0130

Dtc no.

Dtc detecting condition

Trouble area

P0134 After engine is warmed up, heated oxygen sensor (bank 1 sensor 1) output does not indicate rich (greater than 0.45 V) even once when conditions (a), (b), (c), (d) and (e) continue for more than 65 seconds (1 trip detection logic) :
  1.  engine speed: 1,400 rpm or more
  2.  vehicle speed: 24.8 Mph (40 km/h) or more
  3.  throttle valve is not fully closed
  4.  180 seconds or more after starting engine
  5.  engine coolant temperature is more than 40 c (104 f)
  • Open or short in heated oxygen sensor (bank 1 sensor 1) circuit
  • heated oxygen sensor (bank 1 sensor 1)
  • heated oxygen sensor heater (bank 1 sensor 1)
  • efi relay
  • air induction system
  • fuel pressure
  • pcv hose connection
  • pcv valve and hose
  • injector
  • gas leakage in exhaust system
  • pcv piping
  • ecm

Hint

: after confirming dtc p0134, check the output voltage of the heated oxygen sensor (bank 1 sensor 1) in the diagnosis / enhanced obd ii / data list / all using the hand-held tester or the obd ii scan tool.

If the output voltage of the heated oxygen sensor is always less than 0.1 V, the sensor circuit may be open or short.

Monitor description

The ecm uses the heated oxygen sensor to optimize the airfuel mixture in the closedloop fuel control.

This control helps decrease exhaust emissions by providing the catalyst with a nearly stoichiometric mixture.

The sensor detects the oxygen level in the exhaust gas and the ecm uses this data to control the airfuel ratio. The sensor output voltage ranges from 0 v to 1 v. If the signal voltage is less than 0.4 V, the airfuel ratio is lean. If the signal voltage is more than 0.5 V, the airfuel ratio is rich. If the sensor does not indicate rich even once despite the conditions for the closedloop fuel control being met and a specified time period has passed, the ecm will conclude that the closedloop fuel control is malfunctioning. The ecm will illuminate the mil and a dtc is set.

Monitor strategy

Typical enabling condition

Typical enabling condition

Typical malfunction thresholds

Typical malfunction thresholds

Component operating range

Component operating range

Wiring diagram

Wiring diagram

Refer to dtc p0130

Oxygen sensor circuit no activity detected
Dtc p0134 oxygen sensor circuit no activity detected (bank 1 sensor 1) ...

Inspection procedure
Hint: handheld tester only: narrowing down the trouble area is possible by performing a/f control active test (heated oxygen sensor or other trouble areas can be distinguished). Perform ac ...

Other materials:

Inspection procedure
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Driving tips
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Circuit description
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