DTC P2097 POST CATALYST FUEL TRIM SYSTEM TOO RICH BANK 1
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DTC P2097 POST CATALYST FUEL TRIM SYSTEM
TOO RICH BANK 1
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Detect the malfunction of fuel system from
the amount of sub feedback control.
Sub feedback control amount sticks to rich
sides during sub feedback control.
Judge NG when the rear oxygen sensor output
does not come close to target voltage (slice level).
(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
gas
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(B)
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Air fuel
ratio
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(3)
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Electromotive
force
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(C)
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Rich
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(D)
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Lean
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(E)
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Theoretical
air fuel ratio
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(F)
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Comparative
voltage
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Secondary
Parameters
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Enable
Conditions
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Main
feedback
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In
operation
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Sub
feedback
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In
operation
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Amount
of intake air
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≥ 9
g/sec
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Sub feedback
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Sticks
to the limit value (rich side)
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Perform the diagnosis continuously at a constant
80 km/h (50 MPH).
Abnormality Judgment
Calculate the continuous time from the sticking
of sub feedback control amount to rich side and cumulative deviation
(sumdelo 2) of rear oxygen sensor voltage and target voltage.
Judge NG when the malfunction criteria below
are completed after 300 seconds have passed continuously.
Judgment
Value
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Malfunction
Criteria
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Threshold
Value
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sumdelo2 = sumdelo2 + (rvo2 − rsl)
where:
rvo2 = sensing voltage of O
2
sensor
rsl = target voltage of O
2
sensor
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> 710
V
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Time Needed for Diagnosis:
300
seconds
Malfunction Indicator
Light Illumination:
Illuminates when malfunction occurs in
2 continuous drive cycles.
Normality Judgment
Judge OK and clear the NG when the rear oxygen
output is reversed, and during 4 seconds after that, the sub feedback
control amount does not stick to rich or lean sides.
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•
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When the OK idling cycle was completed 40 times
in a row
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•
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When “Clear Memory” was
performed
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MALFUNCTION
INDICATOR LIGHT CLEAR CONDITION
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When OK with similar drive in 3 drive cycles.
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•
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When “Clear Memory” was
performed
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None
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ECM OPERATION
AT DTC SETTING
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Memorize the freeze frame data. (For test
mode $02)
