Nissan Maxima Service and Repair Manual: P0137, P0157 HO2S2
Description
The heated oxygen sensor 2, after three way catalyst (manifold),
monitors the oxygen level in the exhaust gas on each bank.
Even if switching characteristics of the air fuel ratio (A/F) sensor 1
are shifted, the air-fuel ratio is controlled to stoichiometric, by the signal
from the heated oxygen sensor 2.
This sensor is made of ceramic zirconia. The zirconia generates voltage
from approximately 1 V in richer conditions to 0 V in leaner conditions.
Under normal conditions the heated oxygen sensor 2 is not used for
engine control operation.
DTC Logic
DTC DETECTION LOGIC
The heated oxygen sensor 2 has a much longer switching time
between rich and lean than the air fuel ratio (A/F) sensor 1. The oxygen
storage capacity of the three way catalyst (manifold) causes the
longer switching time. To judge the malfunctions of heated oxygen
sensor 2, ECM monitors whether the maximum voltage of the sensor
is sufficiently high during various driving conditions such as fuel-cut.
DTC CONFIRMATION PROCEDURE
1.INSPECTION START
2.PRECONDITIONING
If DTC confirmation Procedure has been previously conducted, always perform
the following before conducting
the next test.
- Turn ignition switch OFF and wait at least 10 seconds.
- Turn ignition switch ON.
- Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
For better results, perform "DTC WORK SUPPORT" at a temperature of 0 to 30 C
(32 to 86 F).
3.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
- Turn ignition switch ON and select "DATA MONITOR" mode with
CONSULT.
- Start engine and warm it up to the normal operating temperature.
- Turn ignition switch OFF and wait at least 10 seconds.
- Turn ignition switch ON.
- Turn ignition switch OFF and wait at least 10 seconds.
- Start engine and keep the engine speed between 3,500 and 4,000 rpm
for at least 1 minute under no load.
- Let engine idle for 1 minute.
- Check that "COOLAN TEMP/S" indicates more than 70C (158F).
If not, warm up engine and go to next step when "COOLAN TEMP/S" indication
reaches 70C (158F).
- Open engine hood.
- . Select "HO2S2 (B1) P1147" (for DTC P0137) or "HO2S2 (B2) P1167" (for
DTC P0157) of "HO2S2" in
"DTC WORK SUPPORT" mode with CONSULT display.
- . Follow the instruction of CONSULT.
NOTE:
It will take at most 10 minutes until "COMPLETED" is displayed.
- . Touch "SELF-DIAG RESULTS".
4.PERFORM DTC CONFIRMATION PROCEDURE AGAIN
- Turn ignition switch OFF and leave the vehicle in a cool place
(soak the vehicle).
- Perform DTC confirmation procedure again.
5.PERFORM COMPONENT FUNCTION CHECK
Perform component function check. Refer to EC-231, "Component Function
Check".
NOTE:
Use component function check to check the overall function of the heated oxygen
sensor 2 circuit. During this
check, a 1st trip DTC might not be confirmed.
Component Function Check
1.PERFORM COMPONENT FUNCTION CHECK-I
Without CONSULT
- Start engine and warm it up to the normal operating temperature.
- Turn ignition switch OFF and wait at least 10 seconds.
- Turn ignition switch ON.
- Turn ignition switch OFF and wait at least 10 seconds.
- Start engine and keep the engine speed between 3,500 and 4,000 rpm
for at least 1 minute under no load.
- Let engine idle for 1 minute.
- Check the voltage between ECM harness connector terminals
under the following conditions.
2.PERFORM COMPONENT FUNCTION CHECK-II
Check the voltage between ECM harness connector terminals under
the following conditions.
3.PERFORM COMPONENT FUNCTION CHECK-III
Check the voltage between ECM harness connector terminals under
the following conditions.
Diagnosis Procedure
1.CHECK GROUND CONNECTION
- Turn ignition switch OFF.
- Check ground connection E9.
2.CLEAR MIXTURE RATIO SELF-LEARNING VALUE
- Clear the mixture ratio self-learning value. Refer to EC-24,
"MIXTURE RATIO SELF-LEARNING VALUE
CLEAR : Special Repair Requirement".
- Run engine for at least 10 minutes at idle speed.
3.CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
- Turn ignition switch OFF.
- Disconnect heated oxygen sensor 2 harness connector.
- Disconnect ECM harness connector.
- Check the continuity between heated oxygen sensor 2 (HO2S2)
harness connector and ECM harness
connector.
- Also check harness for short to ground and short to power.
4.CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
- Check the continuity between HO2S2 harness connector and ECM
harness connector.
- Check the continuity between HO2S2 harness connector and ground, or ECM
harness connector and
ground.
- Also check harness for short to power.
5.CHECK HEATED OXYGEN SENSOR 2
6.REPLACE HEATED OXYGEN SENSOR 2
CAUTION:
- Discard any heated oxygen sensor which has been dropped from a
height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new one.
- Before installing new oxygen sensor, clean exhaust system
threads using Oxygen Sensor Thread
Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved
anti-seize lubricant
(commercial service tool).
7.CHECK INTERMITTENT INCIDENT
Component Inspection
1.INSPECTION START
2.CHECK HEATED OXYGEN SENSOR 2
With CONSULT
- Turn ignition switch ON and select "DATA MONITOR" mode with
CONSULT.
- Start engine and warm it up to the normal operating temperature.
- Turn ignition switch OFF and wait at least 10 seconds.
- Start engine and keep the engine speed between 3,500 and 4,000 rpm
for at least 1 minute under no load.
- Let engine idle for 1 minute.
- Select "FUEL INJECTION" in "ACTIVE TEST" mode, and select "HO2S2
(B1)/(B2)" as the monitor item
with CONSULT.
- Check "HO2S2 (B1)/(B2)" at idle speed when adjusting "FUEL
INJECTION" to +-25%.
- : "HO2S2 (B1)/(B2)" should be above 0.78 V at least once when the "FUEL
INJECTION" is +25%.
- : "HO2S2 (B1)/(B2)" should be below 0.18 V at least once when the "FUEL
INJECTION" is −25%.
3.CHECK HEATED OXYGEN SENSOR 2-I
Without CONSULT
- Start engine and warm it up to the normal operating temperature.
- Turn ignition switch OFF and wait at least 10 seconds.
- Start engine and keep the engine speed between 3,500 and 4,000 rpm
for at least 1 minute under no load.
- Let engine idle for 1 minute.
- Check the voltage between ECM harness connector terminals
under the following conditions.
4.CHECK HEATED OXYGEN SENSOR 2-II
Check the voltage between ECM harness connector terminals under
the following conditions.
5.CHECK HEATED OXYGEN SENSOR 2-III
Check the voltage between ECM harness connector terminals under
the following conditions.
6.REPLACE HEATED OXYGEN SENSOR 2
Replace malfunctioning heated oxygen sensor 2.
CAUTION:
- Discard any heated oxygen sensor which has been dropped from a
height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new one.
- Before installing new oxygen sensor, clean exhaust system
threads using Oxygen Sensor Thread
Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved
anti-seize lubricant
(commercial service tool).
Description
The air fuel ratio (A/F) sensor 1 is a planar one-cell limit current sensor.
The sensor element of the A/F sensor 1 is composed an electrode
layer, which transports ions. It has ...
Description
The heated oxygen sensor 2, after three way catalyst (manifold),
monitors the oxygen level in the exhaust gas on each bank.
Even if switching characteristics of the air fuel rati ...
Other materials:
Intake sensor
Removal and Installation
REMOVAL
Remove the evaporator (2). Refer to HA-48, "EVAPORATOR:
Removal and Installation".
Release the intake sensor clip (A), then remove the intake sensor
(1).
CAUTION:
Mark the mounting position of the intake sensor.
Do not damage the evapo ...
Speedometer and odometer
This vehicle is equipped with a speedometer and
odometer. The speedometer is located on the
right side of the meter cluster. The odometer is
located within the vehicle information display.
Speedometer
The speedometer indicates vehicle speed.
Odometer/Twin trip odometer
The odometer and ...
Tilt sensor
Description
The tilt sensor is installed to the steering column assembly.
The pulse signal is input to the driver seat control unit when the tilt
is operated.
The driver seat control unit counts the pulse and calculates the
tilt amount of the steering column.
Component Function Chec ...