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) |
|
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 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 malfunction thresholds
Component operating range
Monitor result (mode 06 data)
Refer for detailed information on checking monitor status.
Wiring diagram
Confirmation driving pattern
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.
Inspection procedure
1 Inspect transmission wire(s1)
Disconnect the transmission wire connector from the
transaxle.
measure the resistance according to the value(s) in the
table below.
Standard:
2 Check harness and connector(transmission wire – ecm)
Connect the transmission connecto ...
Windshield wipers and washer
Operating the wiper lever
The wiper operation is selected by moving the lever as follows. When intermittent
windshield wiper operation is selected, the wiper interval can be also adjusted.
1 Intermittent windshield wiper operation
2 Low speed windshield wiper operation
3 High speed windshield ...
Overhaul
1. Remove console panel upper
2. Remove console box carpet
3. Remove parking brake hole cover sub–assy
4. Remove console box sub–assy rear
5. Disconnect floor shift cable transmission control shift
Remove the cable end from the rod of the floor shift assembly.
Using a screw ...