fuel INFINITI QX4 2005 Factory Workshop Manual

ON BOARD REFUELING VAPOR RECOVERY (ORVR)
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SYMPTOM: CANNOT REFUEL/FUEL ODOR FROM THE FUEL FILLER OPENING IS STRONG
WHILE REFUELING.
1. CHECK EVAP CANISTER
1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached.
2. Weigh the EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached.
The weight should be less than 2.5 kg (5.5 lb).
OK or NG
OK >> GO TO 2.
NG >> GO TO 3.
2. CHECK IF EVAP CANISTER SATURATED WITH WATER
Does water drain from the EVAP canister?
Ye s o r N o
Yes >> GO TO 3.
No >> GO TO 5.
3. REPLACE EVAP CANISTER
Replace EVAP canister with a new one.
>> GO TO 4.
4. DETECT MALFUNCTIONING PART
Check the EVAP hose between EVAP canister and vehicle frame for clogging or poor connection.
>> Repair or replace EVAP hose.
5. CHECK VENT HOSES AND VENT TUBES
Check hoses and tubes between EVAP canister and refueling EVAP vapor cut valve for clogging, kink, loose-
ness and improper connection.
OK or NG
OK >> GO TO 6.
NG >> Repair or replace hoses and tubes.
6. CHECK FILLER NECK TUBE
Check recirculation line for clogging, dents and cracks.
OK or NG
OK >> GO TO 7.
NG >> Replace filler neck tube.
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EC-42Revision: October 2005
ON BOARD REFUELING VAPOR RECOVERY (ORVR)
2005 QX56
7. CHECK REFUELING EVAP VAPOR CUT VALVE
Refer to EC-43, "
Component Inspection" .
OK or NG
OK >> GO TO 8.
NG >> Replace refueling EVAP vapor cut valve with fuel tank.
8. CHECK FUEL FILLER TUBE
Check filler neck tube and hose connected to the fuel tank for clogging, dents and cracks.
OK or NG
OK >> GO TO 9.
NG >> Replace fuel filler tube.
9. CHECK ONE-WAY FUEL VALVE-I
Check one-way valve for clogging.
OK or NG
OK >> GO TO 10.
NG >> Repair or replace one-way fuel valve with fuel tank.
10. CHECK ONE-WAY FUEL VALVE-II
1. Make sure that fuel is drained from the tank.
2. Remove fuel filler tube and hose.
3. Check one-way fuel valve for operation as follows.
When a stick is inserted, the valve should open, when removing
stick it should close.
Do not drop any material into the tank.
OK or NG
OK >>INSPECTION END
NG >> Replace fuel filler tube or replace one-way fuel valve
with fuel tank.
SEF 6 65 U

ON BOARD REFUELING VAPOR RECOVERY (ORVR)
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Component InspectionUBS00KZL
REFUELING EVAP VAPOR CUT VALVE
With CONSULT-II
1. Remove fuel tank. Refer to FL-9, "FUEL TANK" .
2. Drain fuel from the tank as follows:
a. Remove fuel feed hose located on the fuel gauge retainer.
b. Connect a spare fuel hose, one side to fuel gauge retainer where the hose was removed and the other
side to a fuel container.
c. Drain fuel using “FUEL PUMP RELAY” in “ACTIVE TEST” mode with CONSULT-II.
3. Check refueling EVAP vapor cut valve for being stuck to close as follows.
Blow air into the refueling EVAP vapor cut valve (from the end of EVAP/ORVR line hose), and check that
the air flows freely into the tank.
4. Check refueling EVAP vapor cut valve for being stuck to open as follows.
a. Connect vacuum pump to hose end.
b. Remove fuel gauge retainer with fuel gauge unit.
Always replace O-ring with new one.
c. Put fuel tank upside down.
d. Apply vacuum pressure to hose end [−13.3 kPa (−100 mmHg, −3.94 inHg)] with fuel gauge retainer
remaining open and check that the pressure is applicable.
Without CONSULT-II
1. Remove fuel tank. Refer to FL-9, "FUEL TANK" .
2. Drain fuel from the tank as follows:
a. Remove fuel gauge retainer.
b. Drain fuel from the tank using a handy pump into a fuel container.
3. Check refueling EVAP vapor cut valve for being stuck to close as follows.
Blow air into the refueling EVAP vapor cut valve (from the end of EVAP/ORVR line hose), and check that
the air flows freely into the tank.
4. Check refueling EVAP vapor cut valve for being stuck to open as follows.
a. Connect vacuum pump to hose end.
b. Remove fuel gauge retainer with fuel gauge unit.
Always replace O-ring with new one.
c. Put fuel tank upside down.
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EC-44Revision: October 2005
ON BOARD REFUELING VAPOR RECOVERY (ORVR)
2005 QX56
d. Apply vacuum pressure to hose end [−13.3 kPa (−100 mmHg, −3.94 inHg)] with fuel gauge retainer
remaining open and check that the pressure is applicable.
BBIA0401E

ON BOARD DIAGNOSTIC (OBD) SYSTEM
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Therefore, when electrical controlled throttle and part of ECM related diagnoses are continuously detected as
NG for 5 trips, ECM warns the driver that engine control system malfunctions and MIL circuit is open by means
of operating fail-safe function.
The fail-safe function also operates when above diagnoses except MIL circuit are detected and demands the
driver to repair the malfunction.
Emission-related Diagnostic InformationUBS00KZR
EMISSION-RELATED DIAGNOSTIC INFORMATION ITEMS
×:Applicable —: Not applicable Engine operating condition in fail-safe mode Engine speed will not rise more than 2,500 rpm due to the fuel cut
Items
(CONSULT-II screen terms)DTC*
1
SRT codeTe s t v a l u e /
Test limit
(GST only)Trip MILRefer-
ence page CONSULT-II
GST*
2ECM*3
CAN COMM CIRCUIT U1000
1000*5—— 1×EC-163
CAN COMM CIRCUIT U1001
1001*5—— 2 —EC-163
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.P0000 0000———
Flashing*7EC-65
HO2S2 HTR (B1) P0037 0037××2×EC-166
HO2S2 HTR (B1) P0038 0038××2×EC-166
HO2S2 HTR (B2) P0057 0057××2×EC-166
HO2S2 HTR (B2) P0058 0058××2×EC-166
MAF SEN/CIRCUIT P0101 0101 — — 2×EC-174
MAF SEN/CIRCUIT P0102 0102 — — 1×EC-183
MAF SEN/CIRCUIT P0103 0103 — — 1×EC-183
IAT SEN/CIRCUIT P0112 0112 — — 2×EC-191
IAT SEN/CIRCUIT P0113 0113 — — 2×EC-191
ECT SEN/CIRCUIT P0117 0117 — — 1×EC-195
ECT SEN/CIRCUIT P0118 0118 — — 1×EC-195
TP SEN 2/CIRC P0122 0122 — — 1×EC-201
TP SEN 2/CIRC P0123 0123 — — 1×EC-201
ECT SENSOR P0125 0125 — — 1×EC-208
IAT SENSOR P0127 0127 — — 2×EC-211
THERMSTAT FNCTN P0128 0128 — — 2×EC-214
HO2S2 (B1) P0138 0138 —×2×EC-216
HO2S2 (B1) P0139 0139××2×EC-225
HO2S2 (B2) P0158 0158 —×2×EC-216
HO2S2 (B2) P0159 0159××2×EC-225
FUEL SYS-LEAN-B1 P0171 0171 — — 2×EC-236
FUEL SYS-RICH-B1 P0172 0172 — — 2×EC-245
FUEL SYS-LEAN-B2 P0174 0174 — — 2×EC-236
FUEL SYS-RICH-B2 P0175 0175 — — 2×EC-245
FTT SENSOR P0181 0181 — — 2×EC-253
FTT SEN/CIRCUIT P0182 0182 — — 2×EC-259
FTT SEN/CIRCUIT P0183 0183 — — 2×EC-259
TP SEN 1/CIRC P0222 0222 — — 1×EC-264
TP SEN 1/CIRC P0223 0223 — — 1×EC-264
MULTI CYL MISFIRE P0300 0300 — — 2×EC-271

EC-50Revision: October 2005
ON BOARD DIAGNOSTIC (OBD) SYSTEM
2005 QX56
CYL 1 MISFIRE P0301 0301 — — 2×EC-271
CYL 2 MISFIRE P0302 0302 — — 2×EC-271
CYL 3 MISFIRE P0303 0303 — — 2×EC-271
CYL 4 MISFIRE P0304 0304 — — 2×EC-271
CYL 5 MISFIRE P0305 0305 — — 2×EC-271
CYL 6 MISFIRE P0306 0306 — — 2×EC-271
CYL 7 MISFIRE P0307 0307 — — 2×EC-271
CYL 8 MISFIRE P0308 0308 — — 2×EC-271
KNOCK SEN/CIRC-B1 P0327 0327 — — 2 —EC-279
KNOCK SEN/CIRC-B1 P0328 0328 — — 2 —EC-279
KNOCK SEN/CIRC-B2 P0332 0332 — — 2 —EC-279
KNOCK SEN/CIRC-B2 P0333 0333 — — 2 —EC-279
CKP SEN/CIRCUIT P0335 0335 — — 2×EC-284
CMP SEN/CIRC-B1 P0340 0340 — — 2×EC-291
TW CATALYST SYS-B1 P0420 0420××2×EC-298
TW CATALYST SYS-B2 P0430 0430××2×EC-298
EVAP PURG FLOW/MON P0441 0441××2×EC-304
EVAP SMALL LEAK P0442 0442××2×EC-309
PURG VOLUME CONT/V P0444 0444 — — 2×EC-318
PURG VOLUME CONT/V P0445 0445 — — 2×EC-318
VENT CONTROL VALVE P0447 0447 — — 2×EC-325
EVAP SYS PRES SEN P0451 0451 — — 2×EC-332
EVAP SYS PRES SEN P0452 0452 — — 2×EC-335
EVAP SYS PRES SEN P0453 0453 — — 2×EC-341
EVAP GROSS LEAK P0455 0455 — — 2×EC-349
EVAP VERY SML LEAK P0456 0456
×*4×2×EC-357
FUEL LEV SEN SLOSH P0460 0460 — — 2×EC-366
FUEL LEVEL SENSOR P0461 0461 — — 2×EC-368
FUEL LEVL SEN/CIRC P0462 0462 — — 2×EC-370
FUEL LEVL SEN/CIRC P0463 0463 — — 2×EC-370
VEH SPEED SEN/CIRC*6P0500 0500 — — 2×EC-372
ISC SYSTEM P0506 0506 — — 2×EC-374
ISC SYSTEM P0507 0507 — — 2×EC-376
PW ST P SEN/CIRC P0550 0550 — — 2 —EC-378
ECM P0605 0605 — — 1 or 2× or —EC-383
TCM P0700 0700 — — 1×AT-103
PNP SW/CIRC P0705 0705 — — 2×AT-104
ATF TEMP SEN/CIRC P0710 0710 — — 2×AT-126
VHCL SPD SEN/CIR AT*6P0720 0720 — — 1×AT- 11 5
TCC SOLENOID/CIRC P0740 0740 — — 2×AT- 11 5
A/T TCC S/U FNCTN P0744 0744 — — 2×AT- 11 7
L/PRESS SOL/CIRC P0745 0745 — — 2×AT- 11 9
Items
(CONSULT-II screen terms)DTC*
1
SRT codeTe s t v a l u e /
Test limit
(GST only)Trip MILRefer-
ence page CONSULT-II
GST*
2ECM*3

EC-54Revision: October 2005
ON BOARD DIAGNOSTIC (OBD) SYSTEM
2005 QX56
If a 1st trip DTC is stored in the ECM, the time data will be [1t].
FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATA
The ECM records the driving conditions such as fuel system status, calculated load value, engine coolant tem-
perature, short term fuel trim, long term fuel trim, engine speed, vehicle speed, absolute throttle position, base
fuel schedule and intake air temperature at the moment a malfunction is detected.
Data which are stored in the ECM memory, along with the 1st trip DTC, are called 1st trip freeze frame data.
The data, stored together with the DTC data, are called freeze frame data and displayed on CONSULT-II or
GST. The 1st trip freeze frame data can only be displayed on the CONSULT-II screen, not on the GST. For
details, see EC-130, "
Freeze Frame Data and 1st Trip Freeze Frame Data" .
Only one set of freeze frame data (either 1st trip freeze frame data or freeze frame data) can be stored in the
ECM. 1st trip freeze frame data is stored in the ECM memory along with the 1st trip DTC. There is no priority
for 1st trip freeze frame data and it is updated each time a different 1st trip DTC is detected. However, once
freeze frame data (2nd trip detection/MIL on) is stored in the ECM memory, 1st trip freeze frame data is no
longer stored. Remember, only one set of freeze frame data can be stored in the ECM. The ECM has the fol-
lowing priorities to update the data.
For example, the EGR malfunction (Priority: 2) was detected and the freeze frame data was stored in the 2nd
trip. After that when the misfire (Priority: 1) is detected in another trip, the freeze frame data will be updated
from the EGR malfunction to the misfire. The 1st trip freeze frame data is updated each time a different mal-
function is detected. There is no priority for 1st trip freeze frame data. However, once freeze frame data is
stored in the ECM memory, 1st trip freeze data is no longer stored (because only one freeze frame data or 1st
trip freeze frame data can be stored in the ECM). If freeze frame data is stored in the ECM memory and freeze
frame data with the same priority occurs later, the first (original) freeze frame data remains unchanged in the
ECM memory.
Both 1st trip freeze frame data and freeze frame data (along with the DTCs) are cleared when the ECM mem-
ory is erased. Procedures for clearing the ECM memory are described in EC-62, "
HOW TO ERASE EMIS-
SION-RELATED DIAGNOSTIC INFORMATION" .
SYSTEM READINESS TEST (SRT) CODE
System Readiness Test (SRT) code is specified in Service $01 of SAE J1979.
As part of an enhanced emissions test for Inspection & Maintenance (I/M), certain states require the status of
SRT be used to indicate whether the ECM has completed self-diagnosis of major emission systems and com-
ponents. Completion must be verified in order for the emissions inspection to proceed.
If a vehicle is rejected for a State emissions inspection due to one or more SRT items indicating “INCMP”, use
the information in this Service Manual to set the SRT to “CMPLT”.
In most cases the ECM will automatically complete its self-diagnosis cycle during normal usage, and the SRT
status will indicate “CMPLT” for each application system. Once set as “CMPLT”, the SRT status remains
“CMPLT” until the self-diagnosis memory is erased.
Occasionally, certain portions of the self-diagnostic test may not be completed as a result of the customer's
normal driving pattern; the SRT will indicate “INCMP” for these items.
NOTE:
The SRT will also indicate “INCMP” if the self-diagnosis memory is erased for any reason or if the ECM mem-
ory power supply is interrupted for several hours.
PBIB09 11 E
Priority Items
1Freeze frame data Misfire — DTC: P0300 - P0308
Fuel Injection System Function — DTC: P0171, P0172, P0174, P0175
2 Except the above items (Includes A/T related items)
3 1st trip freeze frame data

ON BOARD DIAGNOSTIC (OBD) SYSTEM
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If, during the state emissions inspection, the SRT indicates “CMPLT” for all test items, the inspector will con-
tinue with the emissions test. However, if the SRT indicates “INCMP” for one or more of the SRT items the
vehicle is returned to the customer untested.
NOTE:
If MIL is ON during the state emissions inspection, the vehicle is also returned to the customer untested even
though the SRT indicates “CMPLT” for all test items. Therefore, it is important to check SRT (“CMPLT”) and
DTC (No DTCs) before the inspection.
SRT Item
The table below shows required self-diagnostic items to set the SRT to “CMPLT”.
*: If completion of several SRTs is required, perform driving patterns (DTC confirmation procedure), one by one based on the priority for
models with CONSULT-II.
SRT Set Timing
SRT is set as “CMPLT” after self-diagnosis has been performed one or more times. Completion of SRT is
done regardless of whether the result is OK or NG. The set timing is different between OK and NG results and
is shown in the table below.
OK: Self-diagnosis is carried out and the result is OK.SRT item
(CONSULT-II indication)Performance
Priority*Required self-diagnostic items to set the SRT to “CMPLT”Corresponding
DTC No.
CATALYST 2 Three way catalyst function P0420, P0430
EVAP SYSTEM 2 EVAP control system purge flow monitoring P0441
1 EVAP control system P0442
2 EVAP control system P0456
HO2S 2 Air fuel ratio (A/F) sensor 1 P1278, P1288
Air fuel ratio (A/F) sensor 1 P1279, P1289
Heated oxygen sensor 2 P0139, P0159
Heated oxygen sensor 2 P1146, P1166
Heated oxygen sensor 2 P1147, P1167
HO2S HTR 2 Air fuel ratio (A/F) sensor 1 heater P1031, P1032,
P1051, P1052
Heated oxygen sensor 2 heater P0037, P0038,
P0057, P0058
Self-diagnosis resultExample
DiagnosisIgnition cycle
← ON → OFF ← ON → OFF ← ON → OFF ← ON →
All OK Case 1 P0400 OK (1) — (1) OK (2) — (2)
P0402 OK (1) — (1) — (1) OK (2)
P1402 OK (1) OK (2) — (2) — (2)
SRT of EGR “CMPLT” “CMPLT” “CMPLT” “CMPLT”
Case 2 P0400 OK (1) — (1) — (1) — (1)
P0402 — (0) — (0) OK (1) — (1)
P1402 OK (1) OK (2) — (2) — (2)
SRT of EGR “INCMP” “INCMP” “CMPLT” “CMPLT”
NG exists Case 3 P0400 OK OK — —
P0402 — — — —
P1402 NG — NGNG
(Consecutive
NG)
(1st trip)
DTC1st trip DTC — 1st trip DTCDTC
(= MIL ON)
SRT of EGR “INCMP” “INCMP” “INCMP” “CMPLT”

EC-60Revision: October 2005
ON BOARD DIAGNOSTIC (OBD) SYSTEM
2005 QX56

The time required for each diagnosis varies with road surface conditions, weather, altitude, individual driv-
ing habits, etc.
Zone A refers to the range where the time, required for the diagnosis under normal conditions*, is the
shortest.
Zone B refers to the range where the diagnosis can still be performed if the diagnosis is not completed
within zone A.
*: Normal conditions refer to the following:

Sea level

Flat road

Ambient air temperature: 20 - 30°C (68 - 86°F)

Diagnosis is performed as quickly as possible under normal conditions.
Under different conditions [For example: ambient air temperature other than 20 - 30°C (68 - 86°F)], diag-
nosis may also be performed.
Pattern 1:

The engine is started at the engine coolant temperature of −10 to 35°C (14 to 95°F)
(where the voltage between the ECM terminal 73 and ground is 3.0 - 4.3V).

The engine must be operated at idle speed until the engine coolant temperature is greater than
70°C (158°F) (where the voltage between the ECM terminal 73 and ground is lower than 1.4V).

The engine is started at the fuel tank temperature of warmer than 0°C (32°F) (where the voltage
between the ECM terminal 107 and ground is less than 4.1V).
Pattern 2:

When steady-state driving is performed again even after it is interrupted, each diagnosis can be con-
ducted. In this case, the time required for diagnosis may be extended.
Pattern 3:

Operate vehicle following the driving pattern shown in the figure.

Release the accelerator pedal during decelerating vehicle speed
from 90 km/h (56 MPH) to 0 km/h (0 MPH).
Pattern 4:

The accelerator pedal must be held very steady during steady-
state driving.

If the accelerator pedal is moved, the test must be conducted all
over again.
*1: Depress the accelerator pedal until vehicle speed is 90 km/h (56
MPH), then release the accelerator pedal and keep it released for
more than 10 seconds. Depress the accelerator pedal until vehicle
speed is 90 km/h (56 MPH) again.
*2: Checking the vehicle speed with GST is advised.
Suggested Transmission Gear Position
Set the selector lever in the D position with the overdrive switch turned ON.
PBIB2244E

ON BOARD DIAGNOSTIC (OBD) SYSTEMEC-61
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TEST VALUE AND TEST LIMIT (GST ONLY — NOT APPLICABLE TO CONSULT-II)
The following is the information specified in Service $06 of SAE J1979.
The test value is a parameter used to determine whether a system/circuit diagnostic test is OK or NG while
being monitored by the ECM during self-diagnosis. The test limit is a reference value which is specified as the
maximum or minimum value and is compared with the test value being monitored.
These data (test value and test limit) are specified by Test ID (TID) and Component ID (CID) and can be dis-
played on the GST screen.
Item Self-diagnostic test item DTCTest value (GST display)
Test limit Conversion
TID CID
CATALYST Three way catalyst function (Bank 1)
P0420 01H 01H Max. 1/128
P0420 02H 81H Min. 1
Three way catalyst function (Bank 2) P0430 03H 02H Max. 1/128
P0430 04H 82H Min. 1
EVAP
SYSTEM EVAP control system (Small leak) P0442 05H 03H Max.
1/128 mm
2
EVAP control system purge flow monitoring P0441 06H 83H Min. 20 mV
EVAP control system (Very small leak) P0456 07H 03H Max. 1/128 mm
2
HO2SAir fuel ratio (A/F) sensor 1 (Bank 1)
P1271 41H 8EH Min. 5mV
P1272 42H 0EH Max. 5mV
P1273 43H 0EH Max. 0.002
P1274 44H 8EH Min. 0.002
P1278
45H 8EH Min. 0.004
P1276 46H 0EH Max. 5mV
P1276 47H 8EH Min. 5mV
P1279 48H 8EH Min. 0.004
Air fuel ratio (A/F) sensor 1 (Bank 2) P1281 4CH 8FH Min. 5mV
P1282 4DH 0FH Max. 5mV
P1283 4EH 0FH Max. 0.002
P1284 4FH 8FH Min. 0.002
P1288
50H 8FH Min. 0.004
P1286 51H 0FH Max. 5mV
P1286 52H 8FH Min. 5mV
P1289 53H 8FH Min. 0.004
Heated oxygen sensor 2 (Bank 1) P0138 1CH 06H Max. 10mV
P0139 19H 86H Min. 10mV/500 ms
P1147 1AH 86H Min. 10 mV
P1146 1BH 06H Max. 10 mV
Heated oxygen sensor 2 (Bank 2) P0158 24H 07H Max. 10mV
P0159 21H 87H Min. 10 mV/500 ms
P1167 22H 87H Min. 10 mV
P1166 23H 07H Max. 10 mV