Nissan Frontier D22. Manual — part 331

DTC P1146 HO2S2

EC-427

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DTC Confirmation Procedure

UBS00ELY

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.

WITH CONSULT-II

TESTING CONDITION:
For better results, perform “DTC WORK SUPPORT” at a temperature of 0 to 30

°C (32 to 86 °F).

1.

Turn ignition switch ON and select “DATA MONITOR” mode with
CONSULT-II.

2.

Start engine and warm it up to the normal operating tempera-
ture.

3.

Turn ignition switch OFF and wait at least 10 seconds.

4.

Start engine and keep the engine speed between 3,500 and
4,000 rpm for at least 1 minute under no load.

5.

Let engine idle for 1 minute.

6.

Select “HO2S2 (B1) P1146” of “HO2S2” in “DTC WORK SUP-
PORT” mode with CONSULT-II.

7.

Start engine and following the instruction of CONSULT-II.

8.

Make sure that “OK” is displayed after touching “SELF-DIAG RESULTS”.
If “NG” is displayed, refer to

EC-430, "Diagnostic Procedure"

.

If “CAN NOT BE DIAGNOSED” is displayed, perform the following.

a.

Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).

b.

Return to step 1.

Overall Function Check

UBS00DA6

Use this procedure to check the overall function of the heated oxygen sensor 2 circuit. During this check, a
DTC might not be confirmed.

CAUTION:

Always drive vehicle at a safe speed.

WITH GST

1.

Start engine and warm it up to normal operating temperature.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Start engine and keep engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

4.

Let engine idle for 1 minute.

SEF189Y

PBIB0818E

EC-428

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DTC P1146 HO2S2

5.

Set voltmeter probes between ECM terminals 56 (Heated oxy-
gen sensor 2 signal) and engine ground.

6.

Check the voltage when revving engine up to 4,000 rpm under
no load at least 10 times.
(Depress and release accelerator pedal as soon as possible.)
The voltage should be below 0.55V at least once during this
procedure.
If the voltage can be confirmed in step 4, step 5 is not nec-
essary.

7.

Keep vehicle at idling for 10 minutes, then check the voltage. Or
check the voltage when coasting from 80 km/h (50 MPH) in 3rd
gear position (M/T), D position with “OD” OFF (A/T).
The voltage should be below 0.55V at least once during this procedure.

8.

If NG, go to

EC-430, "Diagnostic Procedure"

.

AEC874A

DTC P1146 HO2S2

EC-429

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Wiring Diagram

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BBWA1057E

EC-430

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DTC P1146 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

UBS00DA8

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)

56

OR

Heated oxygen sensor 2

[Engine is running]

●

Warm-up condition

●

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

–

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

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