General Precautions of EFI System Maintenance
F-96
Step I: Use diagnostic instrument to read the malfunction information
Read Result I Read Result II
MIL Lamp On P-CODE Present MIL Lamp Off P-CODE Present
P2188
P2188
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
1) Colloidal matter present inside fuel injector
slowing down the turn-off of fuel injector, and
cleaning required
2) Air leakage with air intake valve
3) Deviation in valve clearance
4) Deviation in parts of engine
5) Fuel pressure too high
Maintenance tips:
The malfunction has not bee finally confirmed, and
wait for system to fulfill diagnosis.
127. P2195 Upstream Oxygen Sensor Deteriorated (Upper Limit of Deterioration Factor
Exceeded)
Description about Malfunction Cause:
Normally, air-fuel ratio of combustible mixed gas is changed between thick and thin alternatively.
Correspondingly, amplitude of oxygen sensor signal varies frequently as series of pulse. If sensor deteriorates,
its sensitivity to the mixture may decrease and the characteristic curve deviates, causing slow adjustment of
mixed gas. ECU can calculate deterioration factor as per relevant algorithm through rear oxygen voltage; if
calculation results show that deterioration factor exceeds preset upper limit threshold value, it is determined to
be upper limit of deterioration factor exceeded.
Malfunction Diagnostic Guide:
Required Equipment: (Diagnostic Instrument with EOBD Diagnostic Function)
Step I: Use diagnostic instrument to read the malfunction information
Read Result I Read Result II
MIL Lamp On P-CODE Present MIL Lamp Off P-CODE Present
P2195
P2195
Maintenance tips:
The malfunction has been confirmed, and the
following problems may possibly exist
1) Deteriorated sensor should be replaced.
Maintenance tips:
The malfunction has not been finally confirmed; wait
for ECU to fulfill the final test.
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