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 air–fuel ratio is nearly stoichiometric.

When the air–fuel 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 air–fuel ratio is richer than the stoichiometric air–fuel 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 air–fuel ratio near to the stoichiometric air–fuel ratio. The sensor detects oxygen levels in the exhaust gases and sends this signal to the ecm. This maximizes the catalytic converter’s 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 sensor’s output voltage varies suddenly in the vicinity of the stoichiometric air–fuel 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 air–fuel 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 hand–held tester to the dlc3.
  2.  switch the hand–held 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 hand–held 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: hand–held 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 ...

Other materials:

How to register a Bluetooth® device
1 Display the “Bluetooth* Setup” screen. *: Bluetooth is a registered trademark of Bluetooth SIG, Inc. 2 Select “Add”. 3 When this screen is displayed, search for the device name displayed on this screen on the screen of your Bluetooth® device. For details about operating the Bluetooth® devic ...

Precaution
1. Work precautions (A) vehicle protection (1) when welding, cover glass, seats, carpets, etc. With heat resistant fireploof covers to protect them. (B) safety (1) never stand in the path of the chain when using a puller on the body or frame, and be sure to attach a safety cable. ...

Initialization
Select “Initialize” using . ● Initializing the sound settings Select “Sound setting” using and press (YES). For details about sound settings: ● Initializing the device information Select “Car Device Info” using and press (YES). Automatic connection of a portable device, the ...

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