2004 INFINITI QX56 Factory Service Manual

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Page 1577 of 3371

INFINITI QX56 2004 Factory Service Manual EC-386Revision: August 2007
DTC P1146, P1166 HO2S2
2004 QX56
Wiring DiagramUBS00H87
BANK 1
BBWA11 58 E

Page 1578 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P1146, P1166 HO2S2
EC-387
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EC
Revision: August 20072004 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use EC

Page 1579 of 3371

INFINITI QX56 2004 Factory Service Manual EC-388Revision: August 2007
DTC P1146, P1166 HO2S2
2004 QX56
BANK 2
BBWA11 59 E

Page 1580 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P1146, P1166 HO2S2
EC-389
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EC
Revision: August 20072004 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use EC

Page 1581 of 3371

INFINITI QX56 2004 Factory Service Manual EC-390Revision: August 2007
DTC P1146, P1166 HO2S2
2004 QX56
2. CLEAR THE SELF-LEARNING DATA
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Select “SELF-LEARNING

Page 1582 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P1146, P1166 HO2S2
EC-391
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Revision: August 20072004 QX56
3. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect heated oxygen sensor

Page 1583 of 3371

INFINITI QX56 2004 Factory Service Manual EC-392Revision: August 2007
DTC P1146, P1166 HO2S2
2004 QX56
5. CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM termina

Page 1584 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P1146, P1166 HO2S2
EC-393
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Revision: August 20072004 QX56
6. Select “FUEL INJECTION” in “ACTIVE TEST” mode, and select
“HO2S2 (B1)/(B2)” as the monitor item wi

DTC P1146, P1166 HO2S2
EC-393
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EC
Revision: August 20072004 QX56
6. Select “FUEL INJECTION” in “ACTIVE TEST” mode, and select
“HO2S2 (B1)/(B2)” as the monitor item with CONSULT-II.
7. Check “HO2S2 (B1)/(B2)” at idle speed when adjusting “FUEL INJECTION” to ±25%.
“HO2S2 (B1)/(B2)” should be above 0.70V at least once when the “FUEL INJECTION” is +25%.
“HO2S2 (B1)/(B2)” should be below 0.18V at least once when the “FUEL INJECTION” is −25%.
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 surface 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.
Without CONSULT-II
1. Start engine and warm it up to the normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
4. Let engine idle for 1 minute.
5. Set voltmeter probes between ECM terminal 55 [HO2S2 (B1) signal] or 74 [HO2S2 (B2) signal] and
ground.
6. Check the voltage when revving 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 above 0.70V at least once during this
procedure.
If the voltage is above 0.70V at step 6, step 7 is not neces-
sary.
7. Keep vehicle at idling for 10 minutes, then check voltage. Or
check the voltage when coasting from 80 km/h (50 MPH) in D
position.
The voltage should be below 0.18V at least once during this
procedure.
8. 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 surface 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.
PBIB1672E
PBIB1210E
PBIB2054E

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