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DTC P1152 O2 SENSOR CIRCUIT RANGE/PERFORMANCE (LOW) (BANK1 SENSOR1)

DTC P1152 O 2 SENSOR CIRCUIT RANGE/PERFORMANCE (LOW) (BANK1 SENSOR1)

OUTLINE OF DIAGNOSIS

Detect that lambda value remains Low.

Judge NG when lambda value is abnormal in accordance with lambda value of front oxygen (A/F) sensor and running condition that is vehicle speed, amount of intake air engine coolant temperature, sub feedback control, etc.


Lambda value = Actual air fuel ratio/Theoretical air fuel ratio


COMPONENT DESCRIPTION


(1)

Atmosphere

(A)

Electromotive force

(2)

Exhaust

(B)

Air fuel ratio

(3)

ZrO 2

(C)

Lean

(4)

Ceramic heater

(D)

Rich



ENABLE CONDITION

Secondary Parameters Enable Conditions
All secondary parameters to be in enable conditions

4 seconds or more

Battery voltage

> 10.9 V

Atmospheric pressure

> 75.1 kPa (563 mmHg, 22.2 inHg)

Rear oxygen sensor sub feedback

Operating

Rear oxygen sensor output voltage − feedback target voltage

−0.2 V ←→ 0.1 V

or rear oxygen sensor sub feedback compensation coefficient

On Min.

or rear oxygen sensor sub feedback compensation coefficient

On Max.

After engine starting

60 seconds or more

Engine coolant temperature

≥ 70°C (158°F)

Vehicle speed

≥ 20 km/h (12 MPH)

Amount of intake air

≥ 6 g (0.21 oz)/s

Load change during 0.5 engine rev.

≤ 0.02 g (0.001 oz)/rev

Impedance of front oxygen (A/F) sensor

0 ←→ 50 Ω

Learning value of evaporation gas density

≤ 0.2

Total time of operating canister purge

20 seconds or more

Target lambda load compensation coefficient

−0.03 ←→ 0



GENERAL DRIVING CYCLE

Perform diagnosis continuously at a constant speed of 20 km/h (12 MPH) or more since 60 seconds after starting the engine.

DIAGNOSTIC METHOD

Judge NG when the continuous time of completing the malfunction criteria below becomes more than the time needed for diagnosis (10 seconds). Judge OK and clear NG when the malfunction criteria below are not completed.

Judgment Value

Malfunction Criteria Threshold Value
Output lambda when rear oxygen sensor sub feedback compensation coefficient being at not high limit

≤ 0.85



Time Needed for Diagnosis: 10 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

DTC CLEAR CONDITION


When the OK idling cycle was completed 40 times in a row

When “Clear Memory” was performed


MALFUNCTION INDICATOR LIGHT CLEAR CONDITION


When the OK driving cycle was completed 3 times in a row

When “Clear Memory” was performed


FAIL SAFE


Front oxygen (A/F) sensor main learning compensation: Not allowed to calculate

Front oxygen (A/F) sensor sub learning compensation: Not allowed to calculate

Correction when re-starting at high temperature: Normally minimum value 0.06 → 0

Purge control: Not allowed to purge


ECM OPERATION AT DTC SETTING

Memorize the freeze frame data. (For test mode $02)