DTC P0133 O2 SENSOR CIRCUIT SLOW RESPONSE (BANK 1 SENSOR 1)
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DTC P0133 O
2
SENSOR CIRCUIT SLOW
RESPONSE (BANK 1 SENSOR 1)
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Detect time-lag of front oxygen (A/F)
sensor response. Front oxygen (A/F) sensor cover has some
ventilation holes for exhaust gas. Clogged ventilation holes are
diagnosed. When the holes are clogged, the A/F output variation
becomes slow comparing with the actual A/F variation because
oxygen which reaches the zirconia layer is insufficient. Therefore,
if the cover has clogged holes, the rich to lean judgment in ECM
is delayed when the change from rich to lean is caused.
(1)
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Cover
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(2)
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Zirconia
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(3)
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Clogging
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(1)
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Atmosphere
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(A)
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Electromotive
force
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(2)
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Exhaust
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(B)
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Air fuel
ratio
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(3)
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ZrO
2
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(C)
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Lean
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(4)
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Ceramic
heater
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(D)
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Rich
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Secondary
Parameters
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Enable
Conditions
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Time
needed for all secondary parameters in enable conditions
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≥ 1
second
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Battery voltage
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> 10.9 V
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Atmospheric
pressure
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> 75.1
kPa (563 mmHg, 22.2 inHg)
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Closed
loop control with main feedback
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operating
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Impedance
of front oxygen (A/F) sensor
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0 ←→ 52 Ω
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After
engine starting
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120
seconds or more
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Engine
coolant temperature
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≥ 75°C
(167°F)
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Engine
speed
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1,000 ←→ 3,200
rpm
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Vehicle
speed
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10 ←→ 120
km/h (6.21 ←→ 74.6 MPH)
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Amount
of intake air
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10 ←→ 31
g/s
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Engine
load change during 0.5 engine rev.
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≤ 0.01
g/rev
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Learning
value of EVAP conc. during purge
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≤ 0.2
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Total time
of operating canister purge
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20 seconds
or more
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Perform diagnosis only once at a constant
speed of 10 to 120 km/h (6.21 to 74.6 MPH) in 120 seconds
after starting the engine.
Integrate the difference of faf in every
128 milliseconds and difference of λ value.
After integrate 1,640 times (210 seconds),
calculate the diagnosis value.
Judge NG when the malfunction criteria below
are completed. Judge OK and clear NG when the malfunction criteria
below are not completed.
Judgment
Value
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Malfunction
Criteria
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Threshold
Value
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parafca = td2faf/td2lmd
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≥ 0.30
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where,
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td2faf
(N) = td2faf (n−1) + |d2faf
(n)|
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td2lmd
(N) = td2lmd (n−1) + |d2lmd
(n)|
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add
up for a total of 215 seconds
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d2faf
(n) = (faf (n) − faf (n−1)) − (faf
(n−1) − faf (n−2))
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d2lmd
(n) = (lmd (n) − lmd (n−1)) − (lmd (n−1) − lmd
(n−2))
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faf = main
feedback compensation coefficient every 131 milliseconds
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lmd = output
lambda every 131 milliseconds
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Time Needed for Diagnosis:
210
seconds
Malfunction Indicator
Light Illumination:
Illuminates when malfunction occurs in
2 continuous driving cycles.
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•
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When the OK idling cycle was completed 40 times
in a row
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When “Clear Memory” was
performed
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MALFUNCTION
INDICATOR LIGHT CLEAR CONDITION
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When the OK driving cycle was completed 3 times
in a row
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When “Clear Memory” was
performed
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Front oxygen (A/F) sensor main learning
correction: Not allowed to calculate.
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Correction when re-starting at high
temperature: Normally minimum value 0.3 → 0.
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Purge control: Not allowed to purge.
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ECM OPERATING
AT DTC SETTING
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Memorize the freeze frame data. (For test mode $02)
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Memorize the diagnostic value and trouble
standard value. (For test mode $06)
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