sensor INFINITI M35 2007 Factory Service Manual

DTC P2A00, P2A03 A/F SENSOR 1
EC-651
[VQ35DE]
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Revision: 2007 April2007 M35/M45
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.
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.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic ProcedureNBS0057M
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten two ground screws on the body.
Refer to EC-160, "
Ground Inspection" .
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
24 OA/F sensor 1 heater
(bank 2)[Engine is running]

Warm-up condition

Idle speedApproximately 5V
57 GR/L
A/F sensor 1 (bank 2)[Engine is running]

Warm-up condition

Idle speedApproximately 2.6V
58 LG/BApproximately 2.3V
76 W/LApproximately 3.1V
77 YApproximately 2.3V
PBIB1584E
1. Body ground M70 2. Body ground M16
PBIB2782E

EC-652
[VQ35DE]
DTC P2A00, P2A03 A/F SENSOR 1
Revision: 2007 April2007 M35/M45
2. RETIGHTEN A/F SENSOR 1
1. Loosen and retighten the A/F sensor 1.
>> GO TO 3.
3. CHECK FOR INTAKE AIR LEAK
1. Start engine and run it at idle.
2. Listen for an intake air leak after the mass air flow sensor.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace.Tightening torque: 50 N-m (5.1 kg-m, 37 ft-lb)
PBIB2200E

DTC P2A00, P2A03 A/F SENSOR 1
EC-653
[VQ35DE]
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Revision: 2007 April2007 M35/M45
4. CLEAR THE SELF-LEARNING DATA
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT-II.
3. Clear the self-learning control coefficient by touching “CLEAR”.
4. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected?
Is it difficult to start engine?
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF.
3. Disconnect mass air flow sensor (1) harness connector.
4. Restart engine and let it idle for at least 5 seconds.
5. Stop engine and reconnect mass air flow sensor harness con-
nector.
6. Make sure DTC P0102 is displayed.
7. Erase the DTC memory. Refer to EC-68, "
HOW TO ERASE
EMISSION-RELATED DIAGNOSTIC INFORMATION" .
8. Make sure DTC P0000 is displayed.
9. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected?
Is it difficult to start engine?
Ye s o r N o
Yes >> Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to EC-309, "DTC
P0171, P0174 FUEL INJECTION SYSTEM FUNCTION" or EC-320, "DTC P0172, P0175 FUEL
INJECTION SYSTEM FUNCTION" .
No >> GO TO 5.
SEF968Y
PBIB2783E

EC-654
[VQ35DE]
DTC P2A00, P2A03 A/F SENSOR 1
Revision: 2007 April2007 M35/M45
5. CHECK HARNESS CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect A/F sensor 1 harness connector.
3. Check harness connector for water.
OK or NG
OK >> GO TO 6.
NG >> Repair or replace harness connector.
6. CHECK A/F SENSOR 1 POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between A/F sensor 1 terminal 3 and ground with
CONSULT-II or tester.
OK or NG
OK >> GO TO 8.
NG >> GO TO 7.
7. DETECT MALFUNCTIONING PART
Check the following.

Harness connectors E12, F3

IPDM E/R harness connector E7

15A fuse

Harness for open or short between A/F sensor 1 and fuse
>> Repair or replace harness or connectors. Water should not exit.
PBIB2794E
Voltage: Battery voltage
PBIB1683E

DTC P2A00, P2A03 A/F SENSOR 1
EC-655
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Revision: 2007 April2007 M35/M45
8. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between A/F sensor 1 terminal and ECM terminal as follows.
Refer to Wiring Diagram.
4. Check harness continuity between the following terminals and ground.
Refer to Wiring Diagram.
5. Also check harness for short to power.
OK or NG
OK >> GO TO 9.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
9. CHECK A/F SENSOR 1 HEATER
Refer to EC-176, "
Component Inspection" .
OK or NG
OK >> GO TO 10.
NG >> GO TO 11.
10. CHECK INTERMITTENT INCIDENT
Perform EC-153, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
OK or NG
OK >> GO TO 11.
NG >> Repair or replace.
A/F sensor 1 terminal ECM terminal
Bank1116
275
535
656
Bank 2176
277
557
658
Continuity should exist.
Bank 1 Bank 2
A/F sensor 1 terminal ECM terminal A/F sensor 1 terminal ECM terminal
116176
275277
535557
656658
Continuity should not exist.

EC-656
[VQ35DE]
DTC P2A00, P2A03 A/F SENSOR 1
Revision: 2007 April2007 M35/M45
11 . REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace malfunctioning air fuel ratio (A/F) sensor 1.
CAUTION:

Discard any A/F 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 A/F sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.
>>INSPECTION END
Removal and InstallationNBS0057N
AIR FUEL RATIO (A/F) SENSOR 1
Refer to EM-28, "EXHAUST MANIFOLD" .

FUEL PUMP
EC-675
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Revision: 2007 April2007 M35/M45
FUEL PUMPPFP:17042
DescriptionNBS0057Z
SYSTEM DESCRIPTION
*: ECM determines the start signal status by the signals of engine speed and battery voltage.
The ECM activates the fuel pump for several seconds after the ignition switch is turned ON to improve engine
startability. If the ECM receives a engine speed signal from the camshaft position sensor (PHASE), it knows
that the engine is rotating, and causes the pump to operate. If the engine speed signal is not received when
the ignition switch is ON, the engine stalls. The ECM stops pump operation and prevents battery discharging,
thereby improving safety. The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump
relay, which in turn controls the fuel pump.
COMPONENT DESCRIPTION
A turbine type design fuel pump is used in the fuel tank.

Fuel level sensor unit and fuel pump (1)

Fuel pressure regulator (2)

Fuel tank temperature sensor (3)
CONSULT-II Reference Value in Data Monitor ModeNBS00580
Specification data are reference values.
Sensor Input signal to ECM ECM Function Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)Engine speed*
Fuel pump control Fuel pump relay
Battery Battery voltage*
Condition Fuel pump operation
Ignition switch is turned to ON. Operates for 1 second.
Engine running and crankingOperates.
When engine is stoppedStops in 1.5 seconds.
Except as shown aboveStops.
PBIB2707E
MONITOR ITEM CONDITION SPECIFICATION
FUEL PUMP RLY

For 1 seconds after turning ignition switch: ON

Engine running or crankingON

Except above OFF

EC-680
[VQ35DE]
FUEL PUMP
Revision: 2007 April2007 M35/M45
11 . CHECK CONDENSER
Refer to EC-681, "
Component Inspection" .
OK or NG
OK >> GO TO 12.
NG >> Replace condenser.
12. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-III
1. Turn ignition switch OFF.
2. Disconnect harness connectors B65, B434.
3. Disconnect “fuel level sensor unit and fuel pump” harness con-
nector (1).
–Illustration shows the view with rear seat cushion and inspection
hole cover (RH) removed.
–: Vehicle front
4. Check harness continuity between the following;
harness connector B434 terminal 7 and “fuel level sensor unit and fuel pump” terminal 1,
“fuel level sensor unit and fuel pump” terminal 3 and harness connector B434 terminal 16,
harness connector B65 terminal 16 and dropping resistor terminal 2,
dropping resister terminal 1 and ground.
Refer to Wiring Diagram.
OK or NG
OK >> GO TO 14.
NG >> GO TO 13.
13. DETECT MALFUNCTIONING PART
Check the following.

Harness connectors B65, B434

Harness for open or short between “fuel level sensor unit and fuel pump” and harness connector B434

Harness for open or short between “fuel level sensor unit and fuel pump” and dropping resistor

Harness for open or short between dropping resistor and ground
>> Repair open circuit or short to power in harness or connectors.
14. CHECK DROPPING RESISTOR
Refer to EC-681, "
Component Inspection" .
OK or NG
OK >> GO TO 15.
NG >> Replace dropping resistor.
PBIB2706E
Continuity should exist.

FUEL PUMP
EC-681
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Revision: 2007 April2007 M35/M45
15. CHECK FUEL PUMP
Refer to EC-681, "
Component Inspection" .
OK or NG
OK >> GO TO 16.
NG >> Replace fuel pump.
16. CHECK INTERMITTENT INCIDENT
Refer to EC-153, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
OK or NG
OK >> Replace IPDM E/R.
NG >> Repair or replace harness or connectors.
Component InspectionNBS00583
FUEL PUMP
1. Turn ignition switch OFF.
2. Disconnect “fuel level sensor unit and fuel pump” harness connector.
3. Check resistance between “fuel level sensor unit and fuel pump”
terminals 1 and 3.
DROPPING RESISTOR
1. Turn ignition switch OFF.
2. Disconnect dropping resistor harness connector.
3. Check resistance between dropping resistor terminals 1 and 2.
CONDENSER
1. Turn ignition switch OFF.
2. Disconnect condenser harness connector.Resistance: 0.2 - 5.0Ω [at 25°C (77°F)]
SEC918C
Resistance: Approximately 0.9Ω [at 20°C (68°F)]
PBIB0100E

EC-682
[VQ35DE]
FUEL PUMP
Revision: 2007 April2007 M35/M45
3. Check resistance between condenser terminals 1 and 2.
Removal and InstallationNBS00584
FUEL PUMP
Refer to FL-4, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY" . Resistance: Above 1 MΩ [at 25°C (77°F)]
PBIB0794E