Infiniti Q45. Manual - part 408

DTC P0133, P0153 A/F SENSOR 1

EC-271

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2. 

RETIGHTEN AIR FUEL RATIO (A/F) SENSOR 1

1.

Loosen and retighten the air fuel ratio (A/F) sensor 1.

>> GO TO 3.

3. 

CHECK EXHAUST GAS LEAK

1.

Start engine and run it at idle.

2.

Listen for an exhaust gas leak before three way catalyst (manifold).

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace.

4. 

CHECK FOR INTAKE AIR LEAK

Listen for an intake air leak after the mass air flow sensor.

OK or NG

OK

>> GO TO 5.

NG

>> Repair or replace.

Tightening torque: 50 N-m (5.1 kg-m, 37 ft-lb)

PBIB3133E

PBIB1216E

EC-272

DTC P0133, P0153 A/F SENSOR 1

5. 

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”
or “START”.

4.

Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171, P172, 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 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-61, "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?

Yes or No

Yes

>> Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to 

EC-316, "DTC

P0171, P0174 FUEL INJECTION SYSTEM FUNCTION"

  or 

EC-328, "DTC P0172, P0175 FUEL

INJECTION SYSTEM FUNCTION"

 .

No

>> GO TO 6.

SEF968Y

PBIB2418E

DTC P0133, P0153 A/F SENSOR 1

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6. 

CHECK A/F SENSOR 1 POWER SUPPLY CIRCUIT

1.

Disconnect A/F sensor 1 harness connector.

2.

Turn ignition switch ON.

3.

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 E32, F32

●

Fuse block (J/B) No.1 connector E201

●

10A fuse

●

Harness for open or short between A/F sensor 1 and fuse

>> Repair or replace harness or connectors.

: Vehicle front

1.

A/F sensor 1 (bank 2) harness con-
nector

2.

A/F sensor 1 (bank 1) harness con-
nector

Voltage: Battery voltage

PBIB3134E

PBIB1683E

EC-274

DTC P0133, P0153 A/F SENSOR 1

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 AIR FUEL RATIO (A/F) SENSOR 1 HEATER

Refer to 

EC-179, "Component Inspection"

 .

OK or NG

OK

>> GO TO 10.

NG

>> GO TO 13.

10. 

CHECK MASS AIR FLOW SENSOR

Refer to 

EC-201, "Component Inspection"

 .

OK or NG

OK

>> GO TO 11. 

NG

>> Replace mass air flow sensor.

A/F sensor 1 terminal

ECM terminal

Bank1

1

16

2

75

5

35

6

56

Bank 2

1

76

2

77

5

57

6

58

Continuity should exist.

Bank 1

Bank 2

A/F sensor 1 terminal

ECM terminal

A/F sensor 1 terminal

ECM terminal

1

16

1

76

2

75

2

77

5

35

5

57

6

56

6

58

Continuity should not exist.