Nissan Frontier D40. Manual - part 418
P2A00 A/F SENSOR 1
EC-363
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P2A00 A/F SENSOR 1
Component Description
INFOID:0000000005273404
The A/F sensor 1 is a planar dual-cell limit current sensor. The sen-
sor element of the A/F sensor 1 is the combination of a Nernst con-
centration cell (sensor cell) with an oxygen-pump cell, which
transports ions. It has a heater in the element.
The sensor is capable of precise measurement = 1, but also in the
lean and rich range. Together with its control electronics, the sensor
outputs a clear, continuous signal throughout a wide range (0.7 <
< air).
The exhaust gas components diffuse through the diffusion gap at the
electrode of the oxygen pump and Nernst concentration cell, where
they are brought to thermodynamic balance.
An electronic circuit controls the pump current through the oxygen-
pump cell so that the composition of the exhaust gas in the diffusion
gap remains constant at = 1. Therefore, the A/F sensor 1 is able to
indicate air-fuel ratio by this pumping of current. In addition, a heater
is integrated in the sensor to ensure the required operating tempera-
ture of 700 - 800
°
C (1,292 - 1,472
°
F).
On Board Diagnosis Logic
INFOID:0000000005273405
To judge the malfunction, the A/F signal computed by ECM from the air fuel ratio (A/F) sensor 1 signal is mon-
itored not to be shifted to LEAN side or RICH side.
DTC Confirmation Procedure
INFOID:0000000005273406
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.
WITH CONSULT-III
1.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF and wait at least 10 seconds.
3.
Turn ignition switch ON and select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CON-
SULT-III.
4.
Clear the self-learning coefficient by touching “CLEAR”.
5.
Turn ignition switch OFF and wait at least 10 seconds.
6.
Start engine and keep the engine speed between 3,500 and 4,000 rpm for 1 minute under no load.
7.
Let engine idle for 1 minute.
8.
Keep engine speed between 2,500 and 3,000 rpm for 20 minutes.
9.
Check 1st trip DTC.
SEF579Z
SEF580Z
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible Cause
P2A00
2A00
Air fuel ratio (A/F) sensor 1
circuit range/performance
• The output voltage computed by ECM from the
air fuel ratio (A/F) sensor 1 signal is shifted to
the lean side for a specified period.
• The A/F signal computed by ECM from the air
fuel ratio (A/F) sensor 1 signal is shifted to the
rich side for a specified period.
• Air fuel ratio (A/F) sensor 1
• Air fuel ratio (A/F) sensor 1 heater
• Fuel pressure
• Fuel injector
• Intake air leaks