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EC-888
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DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
Revision: 2005 July 2005 FX
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
TER-
MINAL NO. WIRE
COLOR ITEM CONDITION DATA (DC Voltage)
6R Heated oxygen sensor 2
heater (bank 1) [Engine is running]
Engine speed: Below 3,600 rpm after the
following conditions are met
–Engine: after warming up
–Keeping the engine speed between 3,500
and 4,000 rpm for 1 minute and at idle for 1
minute under no load 0 - 1.0V
[Ignition switch: ON]
Engine stopped
[Engine is running]
Engine speed: Above 3,600 rpm BATTERY VOLTAGE
(11 - 14V)
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DTC P0037, P0038, P0057, P0058 HO2S2 HEATER EC-889
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BANK 2
TBWM0224E
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![INFINITI FX35 2005 Service Manual EC-890
[VK45DE]
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
Revision: 2005 July 2005 FX
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age t INFINITI FX35 2005 Service Manual EC-890
[VK45DE]
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
Revision: 2005 July 2005 FX
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age t](/manual-img/42/57020/w960_57020-2282.png)
EC-890
[VK45DE]
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
Revision: 2005 July 2005 FX
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
Diagnostic ProcedureABS007J9
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to EC-861, "
Ground Inspection" .
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
TER-
MINAL NO. WIRE
COLOR ITEM CONDITION DATA (DC Voltage)
25 P Heated oxygen sensor 2
heater (bank 2) [Engine is running]
Engine speed: Below 3,600 rpm after the
following conditions are met
–Engine: after warming up
–Keeping the engine speed between 3,500
and 4,000 rpm for 1 minute and at idle for 1
minute under no load 0 - 1.0V
[Ignition switch: ON]
Engine stopped
[Engine is running]
Engine speed: Above 3,600 rpm BATTERY VOLTAGE
(11 - 14V)
PBIB2195E
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2. CHECK HO2S2 POWER SUPPLY CIRCUIT
1. Disconnect heated oxygen sensor INFINITI FX35 2005 Service Manual DTC P0037, P0038, P0057, P0058 HO2S2 HEATER EC-891
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2. CHECK HO2S2 POWER SUPPLY CIRCUIT
1. Disconnect heated oxygen sensor](/manual-img/42/57020/w960_57020-2283.png)
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER EC-891
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2. CHECK HO2S2 POWER SUPPLY CIRCUIT
1. Disconnect heated oxygen sensor 2 harness connector.
2. Turn ignition switch ON.
3. Check voltage between HO2S2 terminal 2 and ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3. DETECT MALFUNCTIONING PART
Check the following.
Harness connectors E19, F49
IPDM E/R connector E7
10A fuse
Harness for open or short between heated oxygen sensor 2 and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK HO2S2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal and HO2S2 terminal as follows. Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 5.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
PBIB1534E
Voltage: Battery voltage
PBIB0969E
DTC Te r m i n a l s
Bank
ECM Sensor
P0037, P0038 6 3 1
P0057, P0058 25 3 2
Continuity should exist.
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![INFINITI FX35 2005 Service Manual EC-892
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DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
Revision: 2005 July 2005 FX
5. CHECK HEATED OXYGEN SENSOR 2 HEATER
Refer to EC-892, "
Component Inspection" .
OK or NG
OK >> GO TO 6.
N INFINITI FX35 2005 Service Manual EC-892
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DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
Revision: 2005 July 2005 FX
5. CHECK HEATED OXYGEN SENSOR 2 HEATER
Refer to EC-892, "
Component Inspection" .
OK or NG
OK >> GO TO 6.
N](/manual-img/42/57020/w960_57020-2284.png)
EC-892
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DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
Revision: 2005 July 2005 FX
5. CHECK HEATED OXYGEN SENSOR 2 HEATER
Refer to EC-892, "
Component Inspection" .
OK or NG
OK >> GO TO 6.
NG >> Replace malfunctioning heated oxygen sensor 2.
6. CHECK INTERMITTENT INCIDENT
Refer to EC-854, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END
Component InspectionABS007JA
HEATED OXYGEN SENSOR 2 HEATER
1. Check resistance between HO2S2 terminals as follows.
2. If NG, 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 sur-
face such as a concrete floor; use a new one.
Before installing new oxygen sensor, clean exhaust system
threads using Oxygen Sensor Thread Cleaner tool J-43897-
18 or J-43897-12 and approved anti-seize lubricant.
Removal and InstallationABS007JB
HEATED OXYGEN SENSOR 2
Refer to EM-182, "EXHAUST MANIFOLD AND THREE WAY CATALYST" .
Terminal No. Resistance
2 and 3 5.0 - 7.0 Ω at 25 °C (77 °F)
1 and 2, 3, 4 ∞ Ω
(Continuity should not exist)
4 and 1, 2, 3
PBIB0970E
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DTC P0101 MAF SENSORPFP:22680
Component DescriptionABS00E4R
The mass air flow sensor is placed INFINITI FX35 2005 Service Manual DTC P0101 MAF SENSOR EC-893
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DTC P0101 MAF SENSORPFP:22680
Component DescriptionABS00E4R
The mass air flow sensor is placed](/manual-img/42/57020/w960_57020-2285.png)
DTC P0101 MAF SENSOR EC-893
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DTC P0101 MAF SENSORPFP:22680
Component DescriptionABS00E4R
The mass air flow sensor is placed in the stream of intake air. It mea-
sures the intake flow rate by measuring a part of the entire intake
flow. The mass air flow sensor controls the temperature of the hot
wire to a certain amount. The heat generated by the hot wire is
reduced as the intake air flows around it. The more air, the greater
the heat loss.
Therefore, the electric current supplied to hot wire is changed to
maintain the temperature of the hot wire as air flow increases. The
ECM detects the air flow by means of this current change.
CONSULT-II Reference Value in Data Monitor ModeABS00E4S
Specification data are reference values.
On Board Diagnosis LogicABS00E4T
PBIB1604E
MONITOR ITEM CONDITION SPECIFICATION
MAS A/F SE-B1 See EC-844, "
TROUBLE DIAGNOSIS - SPECIFICATION VALUE" .
CAL/LD VALUE
Engine: After warming up
Selector lever: P or N
Air conditioner switch: OFF
No load Idle 14% - 33%
2,500 rpm 12% - 25%
MASS AIRFLOW
Engine: After warming up
Selector lever: P or N
Air conditioner switch: OFF
No load Idle 2.0 - 6.0 g·m/s
2,500 rpm 7.0 - 20.0 g·m/s
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0101
0101 Mass air flow sensor cir-
cuit range/performance
problem A)
A high voltage from the sensor is sent to ECM
under light load driving condition.
Harness or connectors
(The sensor circuit is open or
shorted.)
Mass air flow sensor
EVAP control system pressure
sensor
Intake air temperature sensor
B) A low voltage from the sensor is sent to ECM
under heavy load driving condition.
Harness or connectors
(The sensor circuit is open or
shorted.)
Intake air leaks
Mass air flow sensor
EVAP control system pressure
sensor
Intake air temperature sensor
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![INFINITI FX35 2005 Service Manual EC-894
[VK45DE]
DTC P0101 MAF SENSOR
Revision: 2005 July 2005 FX
DTC Confirmation ProcedureABS00E4U
Perform PROCEDURE FOR MALFUNCTION A first.
If DTC cannot be confirmed, perform PROCEDURE FOR MALFUN INFINITI FX35 2005 Service Manual EC-894
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DTC P0101 MAF SENSOR
Revision: 2005 July 2005 FX
DTC Confirmation ProcedureABS00E4U
Perform PROCEDURE FOR MALFUNCTION A first.
If DTC cannot be confirmed, perform PROCEDURE FOR MALFUN](/manual-img/42/57020/w960_57020-2286.png)
EC-894
[VK45DE]
DTC P0101 MAF SENSOR
Revision: 2005 July 2005 FX
DTC Confirmation ProcedureABS00E4U
Perform PROCEDURE FOR MALFUNCTION A first.
If DTC cannot be confirmed, perform PROCEDURE FOR MALFUNCTION B.
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.
PROCEDURE FOR MALFUNCTION A
NOTE:
If engine will not start or stops soon, wait at least 10 seconds with engine stopped (Ignition switch ON) instead
of running engine at idle speed.
With CONSULT-II
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Start engine and warm it up to normal operating temperature.
4. Run engine for at least 10 seconds at idle speed.
5. If 1st trip DTC is detected, go to EC-897, "
Diagnostic Procedure"
.
With GST
Follow the procedure “With CONSULT-II” above.
PROCEDURE FOR MALFUNCTION B
CAUTION:
Always drive vehicle at a safe speed.
With CONSULT-II
1. Turn ignition switch ON.
2. Start engine and warm it up to normal operating temperature. If engine cannot be started, go to EC-897, "
Diagnostic Procedure" .
3. Select “DATA MONITOR” mode with CONSULT-II.
4. Check the voltage of “MAS A/F SE-B1” with “DATA MONITOR”.
5. Increases engine speed to about 4,000 rpm.
6. Monitor the linear voltage rise in response to engine speed increases.
If NG, go to EC-897, "
Diagnostic Procedure" .
If OK, go to following step.
SEF174Y
SEF243Y
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7. Maintain the following conditions for at least 10 consecutive sec-
onds.
8. If 1st trip DT INFINITI FX35 2005 Service Manual DTC P0101 MAF SENSOR EC-895
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7. Maintain the following conditions for at least 10 consecutive sec-
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8. If 1st trip DT](/manual-img/42/57020/w960_57020-2287.png)
DTC P0101 MAF SENSOR EC-895
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7. Maintain the following conditions for at least 10 consecutive sec-
onds.
8. If 1st trip DTC is detected, go to EC-897, "
Diagnostic Procedure"
.
Overall Function CheckABS00E4V
PROCEDURE FOR MALFUNCTION B
Use this procedure to check the overall function of the mass air flow sensor circuit. During this check, a DTC
might not be confirmed.
With GST
1. Start engine and warm it up to normal operating temperature.
2. Select “Service $01” with GST.
3. Check the mass air flow sensor signal with “Service $01”.
4. Check for linear mass air flow sensor signal value rise in response to increases to about 4,000 rpm in engine speed.
5. If NG, go to EC-897, "
Diagnostic Procedure" .
ENG SPEED More than 2,000 rpm
THRTL SEN 1 More than 3V
THRTL SEN 2 More than 3V
Selector lever Suitable position
Driving location Driving vehicle uphill (Increased engine load) will help
maintain the driving conditions required for this test.
PBIB0199E
SEF534P