Toyota Tacoma manuals

Toyota Corolla Repair Manual: Circuit description

The rear heated oxygen sensor is used to monitor oxygen concentration in the exhaust gas. For optimum catalytic converter operation, the air fuel mixture must be maintained near the ideal stoichiometric ratio.

The heated oxygen sensor output voltage changes suddenly in the vicinity of the stoichiometric ratio. The ecm adjusts the fuel injection time so that the airfuel ratio is nearly stoichiometric.

When the airfuel ratio becomes lean, the oxygen concentration in the exhaust gas increases. And the heated oxygen sensor informs the ecm of the lean condition (low voltage, i.E. Less than 0.45 V).

When the airfuel ratio is richer than the stoichiometric airfuel ratio, the oxygen will be vanished from the exhaust gas. And the heated oxygen sensor informs the ecm of the rich condition (high voltage, i.E.

More than 0.45 V).

Dtc no.

Dtc detection condition

Trouble area

P0130 Output voltage of heated oxygen sensor remains at 0.4 V or more, or 0.5 V or less, during idling after engine is warmed up (2 trip detection logic)
  • 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
  • injectorecm
P2195 Output voltage of heated oxygen sensor remains at 0.5 V or less, during idling after engine is warmed up (2 trip detection logic)
P2196 Output voltage of heated oxygen sensor remains at 0.4 V or more, during idling after engine is warmed up (2 trip detection logic)

Hint

:

Monitor description

The engine control module (ecm) uses the heated oxygen sensor information to

The engine control module (ecm) uses the heated oxygen sensor information to regulate the airfuel ratio near to the stoichiometric airfuel ratio. The sensor detects oxygen levels in the exhaust gases and sends this signal to the ecm. This maximizes the catalytic converters ability to purify the exhaust gases.

The heated oxygen sensor element consists of the platinum coated zirconia and heating element. The inner surface of sensor element is exposed to the outside air, and the outer surface of sensor element is exposed to the exhaust gases. The sensor generates between 0 v and 1 v of the voltage output in response to the oxygen concentration in the exhaust gases. The sensors output voltage varies suddenly in the vicinity of the stoichiometric airfuel ratio.

Under normal condition, the output voltage from the heated oxygen sensor alternates between rich and lean sides periodically. When it is 0.4 V or less, the airfuel ratio is judged as lean.

If the heated oxygen sensor outputs rich signal (or lean signal) constantly, or if the heated oxygen sensor cannot output enough voltage to reach the minimum specification, the ecm interprets this as a malfunction in the heated oxygen sensor and sets a dtc.

Monitor strategy

Typical enabling condition

Typical enabling condition

Typical malfunction thresholds

Typical malfunction thresholds

Component operating range

Component operating range

Monitor result (mode 06 data)

Monitor result (mode 06 data)

Refer  for detailed information on checking monitor status.

Refer  for detailed information on checking monitor status.

Wiring diagram

Confirmation driving pattern

Confirmation driving pattern

  1. Connect the handheld tester to the dlc3.
  2.  switch the handheld tester from the normal mode to the check mode .
  3.  start the engine and let the engine idle for 120 seconds or more.
  4.  drive the vehicle at 25 mph (40 km/h) or more for 40 seconds or more.
  5.  let the engine idle for 20 seconds or more. Perform steps (d) and (e) at least 3 times.
  6.  let the engine idle for 30 seconds.

Hint

: if a malfunction exists, the mil will be illuminated on the multi information display during step (f).

Notice

: if the conditions in this test are not strictly followed, detection of a malfunction will not occur.

If you do not have the handheld tester, turn the ignition switch off after performing steps from (c) to (f), then perform steps from (c) to (f) again.

Oxygen sensor
Dtc p0130 oxygen sensor circuit malfunction (bank 1 sensor 1) Dtc p2195 oxygen sensor signal stuck lean (bank 1 sensor 1) Dtc p2196 oxygen sensor signal stuck rich (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).  perf ...

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Circuit description
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