Infiniti F50. Manual - part 460

 

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Infiniti F50. Manual - part 460

 

 

DTC P1146, P1166 HO2S2

EC-481

C

D

E

F

G

H

I

J

K

L

M

A

EC

BANK 2

TBWM0148E

EC-482

DTC P1146, P1166 HO2S2

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.

Diagnostic Procedure

EBS00MJ2

1. 

RETIGHTEN GROUND SCREWS

1.

Turn ignition switch “OFF”.

2.

Loosen and retighten engine ground screws.

>> GO TO 2.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

124

B

Heated oxygen sensor 2 
(bank 2)

[Engine is running]

Revving engine from idle up to 3,000 rpm 
quickly after the following conditions are met.

Warm-up condition

Keeping the engine speed between 3,500 
and 4,000 rpm for 1 minute and at idle for 1 
minute under no load

0 - Approximately 1.0V

PBIB0011E

DTC P1146, P1166 HO2S2

EC-483

C

D

E

F

G

H

I

J

K

L

M

A

EC

2. 

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 P0172 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, and restart
and run engine for at least 5 seconds at idle speed.

4.

Stop engine and reconnect mass air flow sensor harness con-
nector.

5.

Make sure DTC P0102 is displayed.

6.

Erase the DTC memory. Refer to 

EC-63, "HOW TO ERASE

EMISSION-RELATED DIAGNOSTIC INFORMATION"

 .

7.

Make sure DTC P0000 is displayed.

8.

Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0172 or P0175 detected?
Is it difficult to start engine?

Yes or No

Yes

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

EC-274

 .

No

>> GO TO 3.

SEF968Y

PBIB0012E

EC-484

DTC P1146, P1166 HO2S2

3. 

CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch “OFF”.

2.

Disconnect heated oxygen sensor 2 harness connector.

3.

Check harness continuity between HO2S2 terminal 4 and engine ground.
Refer to Wiring Diagram.

4.

Also check harness for short to power.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4. 

DETECT MALFUNCTIONING PART

Check the following.

Harness connectors E315, F5

Joint connector-29

Harness open or short between HO2S2 and engine ground

>> Repair open circuit or short to power in harness or connectors.

Continuity should exist.

PBIB0018E

 

 

 

 

 

 

 

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