fuel system INFINITI M35 2006 Factory Workshop Manual

EC-48
[VQ35DE]
ON BOARD REFUELING VAPOR RECOVERY (ORVR)
Revision: 2006 January2006 M35/M45
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 2.0 kg (4.4 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?
EVAP canister (1)
EVAP canister vent control valve (2)
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 control valve for clogging, kink, looseness 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.
PBIB2731E

ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-55
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Revision: 2006 January2006 M35/M45
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 InformationNBS004SN
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 codeTest value/
Test limit
(GST only)Trip MIL Reference page
CONSULT-II
GST*
2ECM*3
CAN COMM CIRCUIT U1000
1000*4——1EC-173
CAN COMM CIRCUIT U1001
1001*4——2—EC-173
CONTROL UNIT(CAN) U1010
1010*4——1EC-176
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.P0000 0000———Flas
hing
*
8—
INT/V TIM CONT-B1 P0011 0011 — — 2
EC-178
INT/V TIM CONT-B2 P0021 0021 — — 2EC-178
A/F SEN1 HTR (B1) P0031 0031 —2EC-182
A/F SEN1 HTR (B1) P0032 0032 —2EC-182
HO2S2 HTR (B1) P0037 0037 —2EC-189
HO2S2 HTR (B1) P0038 0038 —2EC-189
A/F SEN1 HTR (B2) P0051 0051 —2EC-182
A/F SEN1 HTR (B2) P0052 0052 —2EC-182
HO2S2 HTR (B2) P0057 0057 —2EC-189
HO2S2 HTR (B2) P0058 0058 —2EC-189
INT/V TIM V/CIR-B1 P0075 0075 — — 2EC-197
INT/V TIM V/CIR-B2 P0081 0081 — — 2EC-197
MAF SEN/CIRCUIT P0101 0101 — — 2EC-205
MAF SEN/CIRCUIT P0102 0102 — — 1EC-214
MAF SEN/CIRCUIT P0103 0103 — — 1EC-214
IAT SEN/CIRCUIT P0112 0112 — — 2EC-221
IAT SEN/CIRCUIT P0113 0113 — — 2EC-221
ECT SEN/CIRC P0117 0117 — — 1EC-226
ECT SEN/CIRC P0118 0118 — — 1EC-226
TP SEN 2/CIRC P0122 0122 — — 1EC-231
TP SEN 2/CIRC P0123 0123 — — 1EC-231
ECT SENSOR P0125 0125 — — 1EC-238
IAT SENSOR P0127 0127 — — 2EC-241
THERMSTAT FNCTN P0128 0128 — — 2EC-244
A/F SENSOR1 (B1) P0130 0130 —2EC-246
A/F SENSOR1 (B1) P0131 0131 —2EC-256
A/F SENSOR1 (B1) P0132 0132 —2EC-265
A/F SENSOR1 (B1) P0133 01332EC-274
HO2S2 (B1) P0137 01372EC-286

EC-56
[VQ35DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
Revision: 2006 January2006 M35/M45
HO2S2 (B1) P0138 01382EC-297
HO2S2 (B1) P0139 01392EC-310
A/F SENSOR1 (B2) P0150 0150 —2EC-246
A/F SENSOR1 (B2) P0151 0151 —2EC-256
A/F SENSOR1 (B2) P0152 0152 —2EC-265
A/F SENSOR1 (B2) P0153 01532EC-274
HO2S2 (B2) P0157 01572EC-286
HO2S2 (B2) P0158 01582EC-297
HO2S2 (B2) P0159 01592EC-310
FUEL SYS-LEAN-B1 P0171 0171 — — 2EC-321
FUEL SYS-RICH-B1 P0172 0172 — — 2EC-332
FUEL SYS-LEAN-B2 P0174 0174 — — 2EC-321
FUEL SYS-RICH-B2 P0175 0175 — — 2EC-332
FTT SENSOR P0181 0181 — — 2EC-343
FTT SEN/CIRCUIT P0182 0182 — — 2EC-349
FTT SEN/CIRCUIT P0183 0183 — — 2EC-349
TP SEN 1/CIRC P0222 0222 — — 1EC-354
TP SEN 1/CIRC P0223 0223 — — 1EC-354
MULTI CYL MISFIRE P0300 0300 — — 2EC-361
CYL 1 MISFIRE P0301 0301 — — 2EC-361
CYL 2 MISFIRE P0302 0302 — — 2EC-361
CYL 3 MISFIRE P0303 0303 — — 2EC-361
CYL 4 MISFIRE P0304 0304 — — 2EC-361
CYL 5 MISFIRE P0305 0305 — — 2EC-361
CYL 6 MISFIRE P0306 0306 — — 2EC-361
KNOCK SEN/CIRC-B1 P0327 0327 — — 2 —EC-371
KNOCK SEN/CIRC-B1 P0328 0328 — — 2 —EC-371
CKP SEN/CIRCUIT P0335 0335 — — 2EC-376
CMP SEN/CIRC-B1 P0340 0340 — — 2EC-383
CMP SEN/CIRC-B2 P0345 0345 — — 2EC-383
TW CATALYST SYS-B1 P0420 04202EC-392
TW CATALYST SYS-B2 P0430 04302EC-392
EVAP PURG FLOW/MON P0441 04412EC-398
EVAP SMALL LEAK P0442 04422EC-403
PURG VOLUME CONT/V P0443 0443 — — 2EC-412
PURG VOLUME CONT/V P0444 0444 — — 2EC-420
PURG VOLUME CONT/V P0445 0445 — — 2EC-420
VENT CONTROL VALVE P0447 0447 — — 2EC-427
VENT CONTROL VALVE P0448 0448 — — 2EC-434
EVAP SYS PRES SEN P0451 0451 — — 2EC-440
EVAP SYS PRES SEN P0452 0452 — — 2EC-443
EVAP SYS PRES SEN P0453 0453 — — 2EC-450
Items
(CONSULT-II screen terms)DTC*
1
SRT codeTest value/
Te s t l i m i t
(GST only)Trip MIL Reference page
CONSULT-II
GST*
2ECM*3

ON BOARD DIAGNOSTIC (OBD) SYSTEM
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Revision: 2006 January2006 M35/M45EVAP GROSS LEAK P0455 0455 — — 2EC-458
EVAP VERY SML LEAK P0456 0456*72EC-466
FUEL LEV SEN SLOSH P0460 0460 — — 2EC-475
FUEL LEVEL SENSOR P0461 0461 — — 2EC-477
FUEL LEVL SEN/CIRC P0462 0462 — — 2EC-479
FUEL LEVL SEN/CIRC P0463 0463 — — 2EC-479
VEH SPEED SEN/CIRC*5P0500 0500 — — 2EC-481
ISC SYSTEM P0506 0506 — — 2EC-483
ISC SYSTEM P0507 0507 — — 2EC-485
PW ST P SEN/CIRC P0550 0550 — — 2 —EC-487
ECM BACK UP/CIRCUIT P0603 0603 — — 2EC-492
ECM P0605 0605 — —1 or
2 or
—EC-496
SENSOR POWER/CIRC P0643 0643 — — 1EC-499
TCM P0700 0700 — — 1AT- 11 2
PNP SW/CIRC P0705 0705 — — 2AT- 11 3
ATF TEMP SEN/CIRC P0710 0710 — — 2AT- 1 3 5
TURBINE SENSOR P0717 0717 — — 2AT- 11 7
VEH SPD SEN/CIR AT*5P0720 0720 — — 2AT- 11 9
ENGINE SPEED SIG P0725 0725 — — 2AT- 1 2 4
TCC SOLENOID/CIRC P0740 0740 — — 2AT- 1 2 6
A/T TCC S/V FNCTN P0744 0744 — — 2AT- 1 2 8
L/PRESS SOL/CIRC P0745 0745 — — 2AT- 1 3 0
P-N POS SW/CIRCUIT P0850 0850 — — 2EC-504
CLOSED LOOP-B1 P1148 1148 — — 1EC-509
CLOSED LOOP-B2 P1168 1168 — — 1EC-509
TCS C/U FUNCTN P1211 1211 — — 2 —EC-510
TCS/CIRC P1212 1212 — — 2 —EC-511
ENG OVER TEMP P1217 1217 — — 1EC-512
FPCM/CIRCUIT P1220 1220 — — 2EC-525
CTP LEARNING P1225 1225 — — 2 —EC-533
CTP LEARNING P1226 1226 — — 2 —EC-535
BAT CURRENT SENSOR P1550 1550 — — 2 —EC-537
BAT CURRENT SENSOR P1551 1551 — — 2 —EC-543
BAT CURRENT SENSOR P1552 1552 — — 2 —EC-543
BAT CURRENT SENSOR P1553 1553 — — 2 —EC-549
BAT CURRENT SENSOR P1554 1554 — — 2 —EC-555
ASCD SW P1564 1564 — — 1 — EC-561 (Models with ICC)
EC-568
(Models with ASCD)
ICC COMMAND VALUE*
6P1568 1568 — — 1 —EC-575
ASCD BRAKE SW P1572 1572 — — 1 — EC-576 (Models with ICC)
EC-585
(Models with ASCD) Items
(CONSULT-II screen terms)DTC*
1
SRT codeTest value/
Test limit
(GST only)Trip MIL Reference page
CONSULT-II
GST*
2ECM*3

ON BOARD DIAGNOSTIC (OBD) SYSTEM
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the DTC is stored in the ECM memory and the MIL lights up when the same malfunction occurs in two consec-
utive trips. If a 1st trip DTC is stored and a non-diagnostic operation is performed between the 1st and 2nd
trips, only the 1st trip DTC will continue to be stored. For malfunctions that blink or light up the MIL during the
1st trip, the DTC and 1st trip DTC are stored in the ECM memory.
Procedures for clearing the DTC and the 1st trip DTC from the ECM memory are described in EC-67, "
HOW
TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION" .
For malfunctions in which 1st trip DTCs are displayed, refer to EC-55, "
EMISSION-RELATED DIAGNOSTIC
INFORMATION ITEMS" . These items are required by legal regulations to continuously monitor the system/
component. In addition, the items monitored non-continuously are also displayed on CONSULT-II.
1st trip DTC is specified in Service $07 of SAE J1979. 1st trip DTC detection occurs without lighting up the MIL
and therefore does not warn the driver of a malfunction. However, 1st trip DTC detection will not prevent the
vehicle from being tested, for example during Inspection/Maintenance (I/M) tests.
When a 1st trip DTC is detected, check, print out or write down and erase (1st trip) DTC and Freeze Frame
data as specified in Work Flow procedure Step 2, refer to EC-101, "
WORK FLOW" . Then perform DTC Con-
firmation Procedure or Overall Function Check to try to duplicate the malfunction. If the malfunction is dupli-
cated, the item requires repair.
How to Read DTC and 1st Trip DTC
DTC and 1st trip DTC can be read by the following methods.
With CONSULT-II
With GST
CONSULT-II or GST (Generic Scan Tool) Examples: P0340, P0850, P11 4 8 , e t c .
These DTCs are prescribed by SAE J2012.
(CONSULT-II also displays the malfunctioning component or system.)
No Tools
The number of blinks of the MIL in the Diagnostic Test Mode II (Self-Diagnostic Results) indicates the DTC.
Example: 0340, 0850, 1148, etc.
These DTCs are controlled by NISSAN.
1st trip DTC No. is the same as DTC No.
Output of a DTC indicates a malfunction. However, GST or the Diagnostic Test Mode II do not indi-
cate whether the malfunction is still occurring or has occurred in the past and has returned to nor-
mal. CONSULT-II can identify malfunction status as shown below. Therefore, using CONSULT-II (if
available) is recommended.
A sample of CONSULT-II display for DTC and 1st trip DTC is shown below. DTC or 1st trip DTC of a malfunc-
tion is displayed in SELF-DIAGNOSTIC RESULTS mode of CONSULT-II. Time data indicates how many times
the vehicle was driven after the last detection of a DTC.
If the DTC is being detected currently, the time data will be [0].
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-137, "
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
PBIB0911E

EC-60
[VQ35DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
Revision: 2006 January2006 M35/M45
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-67, "
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.
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”.
Priority Items
1Freeze frame data Misfire — DTC: P0300 - P0306
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
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 P0133, P0153
Heated oxygen sensor 2 P0137, P0157
Heated oxygen sensor 2 P0138, P0158
Heated oxygen sensor 2 P0139, P0159

ON BOARD DIAGNOSTIC (OBD) SYSTEM
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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 - 30C (68 - 86F)
Diagnosis is performed as quickly as possible under normal conditions.
Under different conditions [For example: ambient air temperature other than 20 - 30
C (68 - 86F)], diag-
nosis may also be performed.
Pattern 1:
The engine is started at the engine coolant temperature of 10 to 35C (14 to 95F)
(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 (158F) (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 0C (32F) (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

EC-66
[VQ35DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
Revision: 2006 January2006 M35/M45
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
CATALYSTThree 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
SYSTEMEVAP 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)P0131 41H 8EH Min. 5mV
P0132 42H 0EH Max. 5mV
P2A00 43H 0EH Max. 0.002
P2A00 44H 8EH Min. 0.002
P0133 45H 8EH Min. 0.004
P0130 46H 0EH Max. 5mV
P0130 47H 8EH Min. 5mV
P0133 48H 8EH Min. 0.004
Air fuel ratio (A/F) sensor 1 (Bank 2)P0151 4CH 8FH Min. 5mV
P0152 4DH 0FH Max. 5mV
P2A03 4EH 0FH Max. 0.002
P2A03 4FH 8FH Min. 0.002
P0153 50H 8FH Min. 0.004
P0150 51H 0FH Max. 5mV
P0150 52H 8FH Min. 5mV
P0153 53H 8FH Min. 0.004
Heated oxygen sensor 2 (Bank 1)P0139 19H 86H Min. 10mV/500 ms
P0137 1AH 86H Min. 10 mV
P0138 1BH 06H Max. 10 mV
P0138 1CH 06H Max. 10mV
Heated oxygen sensor 2 (Bank 2)P0159 21H 87H Min. 10 mV/500 ms
P0157 22H 87H Min. 10 mV
P0158 23H 07H Max. 10 mV
P0158 24H 07H Max. 10mV

ON BOARD DIAGNOSTIC (OBD) SYSTEM
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–Te s t v a l u e s
Actual work procedures are explained using a DTC as an example. Be careful so that not only the DTC, but all
of the data listed above, are cleared from the ECM memory during work procedures.
Malfunction Indicator Lamp (MIL)NBS004SO
DESCRIPTION
The MIL is located on the instrument panel.
1. The MIL will light up when the ignition switch is turned ON with-
out the engine running. This is a bulb check.
If the MIL does not light up, refer to DI-40, "
WARNING LAMPS" ,
or see EC-722, "
MIL AND DATA LINK CONNECTOR" .
2. When the engine is started, the MIL should go off.
If the MIL remains on, the on board diagnostic system has
detected an engine system malfunction.
ON BOARD DIAGNOSTIC SYSTEM FUNCTION
The on board diagnostic system has the following three functions.
When there is an open circuit on MIL circuit, the ECM cannot warn the driver by lighting up MIL when there is
malfunction on engine control system.
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.
SEF217U
Diagnostic Test
ModeKEY and ENG.
StatusFunction Explanation of Function
Mode I Ignition switch in
ON position
Engine stoppedBULB CHECK This function checks the MIL bulb for damage (blown,
open circuit, etc.).
If the MIL does not come on, check MIL circuit.
Engine running MALFUNCTION
WARNINGThis is a usual driving condition. When a malfunction is
detected twice in two consecutive driving cycles (two trip
detection logic), the MIL will light up to inform the driver
that a malfunction has been detected.
The following malfunctions will light up or blink the MIL in
the 1st trip.
Misfire (Possible three way catalyst damage)
One trip detection diagnoses
Mode II Ignition switch in
ON position
Engine stoppedSELF-DIAGNOSTIC
RESULTSThis function allows DTCs and 1st trip DTCs to be read.
Engine operating condition in fail-safe mode Engine speed will not rise more than 2,500 rpm due to the fuel cut

EC-72
[VQ35DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
Revision: 2006 January2006 M35/M45
OBD System Operation ChartNBS004SP
RELATIONSHIP BETWEEN MIL, 1ST TRIP DTC, DTC, AND DETECTABLE ITEMS
When a malfunction is detected for the first time, the 1st trip DTC and the 1st trip freeze frame data are
stored in the ECM memory.
When the same malfunction is detected in two consecutive trips, the DTC and the freeze frame data are
stored in the ECM memory, and the MIL will come on. For details, refer to EC-54, "
Two Trip Detection
Logic" .
The MIL will go off after the vehicle is driven 3 times (driving pattern B) with no malfunction. The drive is
counted only when the recorded driving pattern is met (as stored in the ECM). If another malfunction
occurs while counting, the counter will reset.
The DTC and the freeze frame data will be stored until the vehicle is driven 40 times (driving pattern A)
without the same malfunction recurring (except for Misfire and Fuel Injection System). For Misfire and
Fuel Injection System, the DTC and freeze frame data will be stored until the vehicle is driven 80 times
(driving pattern C) without the same malfunction recurring. The “TIME” in “SELF-DIAGNOSTIC
RESULTS” mode of CONSULT-II will count the number of times the vehicle is driven.
The 1st trip DTC is not displayed when the self-diagnosis results in OK for the 2nd trip.
SUMMARY CHART
For details about patterns B and C under “Fuel Injection System” and “Misfire”, see EC-74, "EXPLANATION FOR DRIVING PATTERNS
FOR “MISFIRE ”, “FUEL INJECTION SYSTEM”" .
For details about patterns A and B under Other, see EC-76, "
EXPLANATION FOR DRIVING PATTERNS EXCEPT FOR “MISFIRE
”, “FUEL INJECTION SYSTEM”" .
*1: Clear timing is at the moment OK is detected.
*2: Clear timing is when the same malfunction is detected in the 2nd trip. Items Fuel Injection System Misfire Other
MIL (goes off) 3 (pattern B) 3 (pattern B) 3 (pattern B)
DTC, Freeze Frame Data (no
display)80 (pattern C) 80 (pattern C) 40 (pattern A)
1st Trip DTC (clear)
1 (pattern C), *
11 (pattern C), *11 (pattern B)
1st Trip Freeze Frame Data
(clear)*1, *2 *1, *2 1 (pattern B)