Nissan Murano Z50 (2003 year). Manual — part 84
BASIC SERVICE PROCEDURE
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33.
CHECK HEATED OXYGEN SENSOR 1 (BANK 1)/(BANK 2) SIGNAL
Without CONSULT-II
1.
Set ECM to Self-diagnostic mode II (Heated oxygen sensor 1 monitor). Refer to
2.
Switch the monitored sensor to the malfunctioning bank. Refer to
EC-85, "How to Switch Monitored Sen-
sor From Bank 1 to Bank 2 or Vice Versa"
.
3.
Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.),
check that the MIL comes on more than 5 times during 10 seconds.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 34.
34.
DETECT MALFUNCTIONING PART
Check the following.
●
Check fuel pressure regulator and repair or replace if necessary. Refer to
●
Check mass air flow sensor and its circuit, and repair or replace if necessary. Refer to
and
.
●
Check injector and its circuit, and repair or replace if necessary. Refer to
●
Check engine coolant temperature sensor and its circuit, and repair or replace if necessary. Refer to
and
OK or NG
OK
>> GO TO 36.
NG
>> 1. Repair or replace.
2. GO TO 35.
35.
ERASE UNNECESSARY DTC
After this inspection, unnecessary DTC might be displayed.
Erase the stored memory in ECM and TCM. Refer to
EC-81, "HOW TO ERASE EMISSION-RELATED DIAG-
.
>> GO TO 4.
36.
CHECK ECM FUNCTION
1.
Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but
this is the rarely the case.)
2.
Perform initialization of NVIS (NATS) system and registration of NVIS (NATS) ignition key IDs. Refer to
BL-189, "ECM Re-communicating Function"
.
>> GO TO 4.
Accelerator Pedal Released Position Learning
ABS004AI
DESCRIPTION
“Accelerator Pedal Released Position Learning” is an operation to learn the fully released position of the accel-
erator pedal by monitoring the accelerator pedal position sensor output signal. It must be performed each time
harness connector of accelerator pedal position sensor or ECM is disconnected.
OPERATION PROCEDURE
1.
Make sure that accelerator pedal is fully released.
2.
Turn ignition switch “ON” and wait at least 2 seconds.
3.
Turn ignition switch “OFF” wait at least 10 seconds.
4.
Turn ignition switch “ON” and wait at least 2 seconds.
5.
Turn ignition switch “OFF” wait at least 10 seconds.
EC-64
BASIC SERVICE PROCEDURE
Revision; 2004 April
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Throttle Valve Closed Position Learning
ABS004AJ
DESCRIPTION
“Throttle Valve Closed Position Learning” is an operation to learn the fully closed position of the throttle valve
by monitoring the throttle position sensor output signal. It must be performed each time harness connector of
electric throttle control actuator or ECM is disconnected.
OPERATION PROCEDURE
1.
Make sure that accelerator pedal is fully released.
2.
Turn ignition switch “ON”.
3.
Turn ignition switch “OFF” wait at least 10 seconds.
Make sure that throttle valve moves during above 10 seconds by confirming the operating sound.
Idle Air Volume Learning
ABS004AK
DESCRIPTION
“Idle Air Volume Learning” is an operation to learn the idle air volume that keeps each engine within the spe-
cific range. It must be performed under any of the following conditions:
●
Each time electric throttle control actuator or ECM is replaced.
●
Idle speed or ignition timing is out of specification.
PREPARATION
Before performing “Idle Air Volume Learning”, make sure that all of the following conditions are satisfied.
Learning will be cancelled if any of the following conditions are missed for even a moment.
●
Battery voltage: More than 12.9V (At idle)
●
Engine coolant temperature: 70 - 100
°
C (158 - 212
°
F)
●
PNP switch: ON
●
Electric load switch: OFF
(Air conditioner, headlamp, rear window defogger)
On vehicles equipped with daytime light systems, set lighting switch to the 1st position to light
only small lamps.
●
Steering wheel: Neutral (Straight-ahead position)
●
Vehicle speed: Stopped
●
Transmission: Warmed-up
For models with CONSULT-II, drive vehicle until “FLUID TEMP SE” in “DATA MONITOR” mode of “CVT”
system indicates less than 0.9V.
For models without CONSULT-II, drive vehicle for 10 minutes.
OPERATION PROCEDURE
With CONSULT-II
1.
Perform
EC-63, "Accelerator Pedal Released Position Learning"
.
2.
Perform
EC-64, "Throttle Valve Closed Position Learning"
3.
Start engine and warm it up to normal operating temperature.
4.
Check that all items listed under the topic “PREPARATION” (previously mentioned) are in good order.
5.
Select “IDLE AIR VOL LEARN” in “WORK SUPPORT” mode.
SEF217Z
BASIC SERVICE PROCEDURE
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6.
Touch “START” and wait 20 seconds.
7.
Make sure that “CMPLT” is displayed on CONSULT-II screen. If
“CMPLT” is not displayed, “Idle Air Volume Learning” will not be
carried out successfully. In this case, find the cause of the inci-
dent by referring to the “Diagnostic Procedure” below.
8.
Rev up the engine two or three times and make sure that idle
speed and ignition timing are within the specifications.
Without CONSULT-II
NOTE:
●
It is better to count the time accurately with a clock.
●
It is impossible to switch the diagnostic mode when an accelerator pedal position sensor circuit
has a malfunction.
1.
Perform
EC-63, "Accelerator Pedal Released Position Learning"
2.
Perform
EC-64, "Throttle Valve Closed Position Learning"
3.
Start engine and warm it up to normal operating temperature.
4.
Check that all items listed under the topic “PREPARATION” (previously mentioned) are in good order.
5.
Turn ignition switch “OFF” and wait at least 10 seconds.
6.
Confirm that accelerator pedal is fully released, turn ignition switch “ON” and wait 3 seconds.
7.
Repeat the following procedure quickly five times within 5 seconds.
a.
Fully depress the accelerator pedal.
b.
Fully release the accelerator pedal.
8.
Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 20 seconds until the MIL stops
blinking and turned ON.
9.
Fully release the accelerator pedal within 3 seconds after the MIL turned ON.
10. Start engine and let it idle.
11. Wait 20 seconds.
12. Rev up the engine two or three times and make sure that idle speed and ignition timing are within the
specifications.
SEF454Y
ITEM
SPECIFICATION
Idle speed
CVT: 650
±
50 rpm (in “P” or “N” position)
Ignition timing
CVT: 15
±
5
°
BTDC (in “P” or “N” position)
MBIB0238E
SEC897C
EC-66
BASIC SERVICE PROCEDURE
Revision; 2004 April
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13. If idle speed and ignition timing are not within the specification, “Idle Air Volume Learning” will not be car-
ried out successfully. In this case, find the cause of the incident by referring to the “DIAGNOSTIC PROCE-
DURE” below.
DIAGNOSTIC PROCEDURE
If idle air volume learning cannot be performed successfully, proceed as follows:
1.
Check that throttle valve is fully closed.
2.
Check PCV valve operation.
3.
Check that downstream of throttle valve is free from air leakage.
4.
When the above three items check out OK, engine component parts and their installation condi-
tion are questionable. Check and eliminate the cause of the incident.
It is useful to perform
EC-147, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE"
5.
If any of the following conditions occur after the engine has started, eliminate the cause of the
incident and perform “Idle air volume learning” all over again:
●
Engine stalls.
●
Erroneous idle.
Fuel Pressure Check
ABS004AL
FUEL PRESSURE RELEASE
Before disconnecting fuel line, release fuel pressure from fuel line to eliminate danger.
NOTE:
Prepare pans or saucers under the disconnected fuel line because the fuel may spill out. The fuel pres-
sure cannot be completely released because Z50 models do not have fuel return system.
With CONSULT-II
1.
Turn ignition switch “ON”.
2.
Perform “FUEL PRESSURE RELEASE” in “WORK SUPPORT”
mode with CONSULT-II.
3.
Start engine.
4.
After engine stalls, crank it two or three times to release all fuel
pressure.
5.
Turn ignition switch “OFF”.
Without CONSULT-II
1.
Remove fuel pump fuse located in IPDM E/R.
2.
Start engine.
3.
After engine stalls, crank it two or three times to release all fuel
pressure.
4.
Turn ignition switch “OFF”.
5.
Reinstall fuel pump fuse after servicing fuel system.
ITEM
SPECIFICATION
Idle speed
CVT: 650
±
50 rpm (in “P” or “N” position)
Ignition timing
CVT: 15
±
5
°
BTDC (in “P” or “N” position)
SEF214Y
PBIB1375E
BASIC SERVICE PROCEDURE
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FUEL PRESSURE CHECK
NOTE:
Use Fuel Pressure Gauge Kit (J-44321) to check fuel pressure.
1.
Release fuel pressure to zero. Refer to
EC-66, "FUEL PRESSURE RELEASE"
2.
Install the inline fuel quick disconnected fitting between fuel
damper and injector tube.
3.
Connect the fuel pressure test gauge (quick connector adapter
hose) to the inline fuel quick disconnected fitting.
4.
Turn ignition switch ON and check for fuel leakage.
5.
Start engine and check for fuel leakage.
6.
Read the indication of fuel pressure gauge.
7.
If result is unsatisfactory, go to next step.
8.
Check the following.
●
Fuel hoses and fuel tubes for clogging
●
Fuel filter for clogging
●
Fuel pump
●
Fuel pressure regulator for clogging
If OK, replace fuel pressure regulator.
If NG, repair or replace.
At idling:
Approximately 350 kPa (3.57 kg/cm
2
, 51 psi)
PBIB1376E
EC-68
ON BOARD DIAGNOSTIC (OBD) SYSTEM
Revision; 2004 April
2003 Murano
ON BOARD DIAGNOSTIC (OBD) SYSTEM
PFP:00028
Introduction
ABS004AM
The ECM has an on board diagnostic system, which detects malfunctions related to engine sensors or actua-
tors. The ECM also records various emission-related diagnostic information including:
The above information can be checked using procedures listed in the table below.
×
: Applicable
—: Not applicable
*1: 1st trip DTCs for self-diagnoses concerning SRT items cannot be shown on the GST display.
*2: When DTC and 1st trip DTC simultaneously appear on the display, they cannot be clearly distinguished from each other.
The malfunction indicator lamp (MIL) on the instrument panel lights up when the same malfunction is detected
in two consecutive trips (Two trip detection logic), or when the ECM enters fail-safe mode. (Refer to
.)
Two Trip Detection Logic
ABS004AN
When a malfunction is detected for the first time, 1st trip DTC and 1st trip Freeze Frame data are stored in the
ECM memory. The MIL will not light up at this stage. <1st trip>
If the same malfunction is detected again during the next drive, the DTC and Freeze Frame data are stored in
the ECM memory, and the MIL lights up. The MIL lights up at the same time when the DTC is stored. <2nd
trip> The “trip” in the “Two Trip Detection Logic” means a driving mode in which self-diagnosis is performed
during vehicle operation. Specific on board diagnostic items will cause the ECM to light up or blink the MIL,
and store DTC and Freeze Frame data, even in the 1st trip, as shown below.
×
: Applicable
—: Not applicable
When there is an open circuit on MIL circuit, the ECM cannot warn the driver by lighting MIL up 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.
Emission-related diagnostic information
SAE Mode
Diagnostic Trouble Code (DTC)
Mode 3 of SAE J1979
Freeze Frame data
Mode 2 of SAE J1979
System Readiness Test (SRT) code
Mode 1 of SAE J1979
1st Trip Diagnostic Trouble Code (1st Trip DTC)
Mode 7 of SAE J1979
1st Trip Freeze Frame data
Test values and Test limits
Mode 6 of SAE J1979
Calibration ID
Mode 9 of SAE J1979
DTC
1st trip DTC
Freeze Frame
data
1st trip Freeze
Frame data
SRT code
Test value
CONSULT-II
×
×
×
×
×
—
GST
×
×
*1
×
—
×
×
ECM
×
×
*2
—
—
—
—
Items
MIL
DTC
1st trip DTC
1st trip
2nd trip
1st trip
displaying
2nd trip
displaying
1st trip
displaying
2nd trip
display-
ing
Blinking
Lighting
up
Blinking
Lighting
up
Misfire (Possible three way cata-
lyst damage) — DTC: P0300 -
P0306 is being detected
×
—
—
—
—
—
×
—
Misfire (Possible three way cata-
lyst damage) — DTC: P0300 -
P0306 is being detected
—
—
×
—
—
×
—
—
One trip detection diagnoses
(Refer to
—
×
—
—
×
—
—
—
Except above
—
—
—
×
—
×
×
—
ON BOARD DIAGNOSTIC (OBD) SYSTEM
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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 Information
ABS004AO
EMISSION-RELATED DIAGNOSTIC INFORMATION ITEMS
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 code
Test value/
Test limit
(GST only)
1st trip DTC
Reference
page
CONSULT-II
GST*
2
ECM*
3
CAN COMM CIRCUIT
U1000
1000*
6
—
—
—
CAN COMM CIRCUIT
U1001
1001*
6
—
—
×
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.
P0000
0000
—
—
—
—
INT/V TIM CONT-B1
P0011
0011
—
—
×
INT/V TIM CONT-B2
P0021
0021
—
—
×
HO2S1 HTR (B1)
P0031
0031
×
×
×
*
5
HO2S1 HTR (B1)
P0032
0032
×
×
×
*
5
HO2S2 HTR (B1)
P0037
0037
×
×
×
*
5
HO2S2 HTR (B1)
P0038
0038
×
×
×
*
5
HO2S1 HTR (B2)
P0051
0051
×
×
×
*
5
HO2S1 HTR (B2)
P0052
0052
×
×
×
*
5
HO2S2 HTR (B2)
P0057
0057
×
×
×
*
5
HO2S2 HTR (B2)
P0058
0058
×
×
×
*
5
MAF SEN/CIRCUIT
P0101
0101
—
—
—
MAF SEN/CIRCUIT
P0102
0102
—
—
—
MAF SEN/CIRCUIT
P0103
0103
—
—
—
IAT SEN/CIRCUIT
P0112
0112
—
—
×
IAT SEN/CIRCUIT
P0113
0113
—
—
×
ECT SEN/CIRCUIT
P0117
0117
—
—
—
ECT SEN/CIRCUIT
P0118
0118
—
—
—
TP SEN 2/CIRC
P0122
0122
—
—
—
TP SEN 2/CIRC
P0123
0123
—
—
—
ECT SENSOR
P0125
0125
—
—
—
IAT SENSOR
P0127
0127
—
—
×
THERMSTAT FNCTN
P0128
0128
—
—
×
HO2S1 (B1)
P0132
0132
×
×
×
*
5
HO2S1 (B1)
P0133
0133
×
×
×
*
5
HO2S1 (B1)
P0134
0134
×
×
×
*
5
HO2S2 (B1)
P0138
0138
×
×
×
*
5
HO2S2 (B1)
P0139
0139
×
×
×
*
5
HO2S1 (B2)
P0152
0152
×
×
×
*
5
HO2S1 (B2)
P0153
0153
×
×
×
*
5
HO2S1 (B2)
P0154
0154
×
×
×
*
5
EC-70
ON BOARD DIAGNOSTIC (OBD) SYSTEM
Revision; 2004 April
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HO2S2 (B2)
P0158
0158
×
×
×
*
5
HO2S2 (B2)
P0159
0159
×
×
×
*
5
FUEL SYS-LEAN-B1
P0171
0171
—
—
×
FUEL SYS-RICH-B1
P0172
0172
—
—
×
FUEL SYS-LEAN-B2
P0174
0174
—
—
×
FUEL SYS-RICH-B2
P0175
0175
—
—
×
FTT SENSOR
P0181
0181
—
—
×
FTT SEN/CIRCUIT
P0182
0182
—
—
×
FTT SEN/CIRCUIT
P0183
0183
—
—
×
TP SEN 1/CIRC
P0222
0222
—
—
—
TP SEN 1/CIRC
P0223
0223
—
—
—
MULTI CYL MISFIRE
P0300
0300
—
—
×
CYL 1 MISFIRE
P0301
0301
—
—
×
CYL 2 MISFIRE
P0302
0302
—
—
×
CYL 3 MISFIRE
P0303
0303
—
—
×
CYL 4 MISFIRE
P0304
0304
—
—
×
CYL 5 MISFIRE
P0305
0305
—
—
×
CYL 6 MISFIRE
P0306
0306
—
—
×
KNOCK SEN/CIRC-B1
P0327
0327
—
—
×
KNOCK SEN/CIRC-B1
P0328
0328
—
—
×
CKP SEN/CIRCUIT
P0335
0335
—
—
×
CMP SEN/CIRC-B1
P0340
0340
—
—
×
CMP SEN/CIRC-B2
P0345
0345
—
—
×
TW CATALYST SYS-B1
P0420
0420
×
×
×
*
5
TW CATALYST SYS-B2
P0430
0430
×
×
×
*
5
EVAP PURG FLOW/MON
P0441
0441
×
×
×
*
5
EVAP SMALL LEAK
P0442
0442
×
×
×
*
5
PURG VOLUME CONT/V
P0444
0444
—
—
×
PURG VOLUME CONT/V
P0445
0445
—
—
×
VENT CONTROL VALVE
P0447
0447
—
—
×
EVAP SYS PRES SEN
P0451
0451
—
—
×
EVAP SYS PRES SEN
P0452
0452
—
—
×
EVAP SYS PRES SEN
P0453
0453
—
—
×
EVAP GROSS LEAK
P0455
0455
—
×
×
*
5
EVAP VERY SML LEAK
P0456
0456
×
*
4
×
×
*
5
FUEL LEV SEN SLOSH
P0460
0460
—
—
×
FUEL LEVEL SENSOR
P0461
0461
—
—
×
FUEL LEVL SEN/CIRC
P0462
0462
—
—
×
FUEL LEVL SEN/CIRC
P0463
0463
—
—
×
VEH SPEED SEN/CIRC*
7
P0500
0500
—
—
×
ISC SYSTEM
P0506
0506
—
—
×
Items
(CONSULT-II screen terms)
DTC*
1
SRT code
Test value/
Test limit
(GST only)
1st trip DTC
Reference
page
CONSULT-II
GST*
2
ECM*
3
ON BOARD DIAGNOSTIC (OBD) SYSTEM
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ISC SYSTEM
P0507
0507
—
—
×
PW ST P SEN/CIRC
P0550
0550
—
—
×
ECM
P0605
0605
—
—
×
or —
PNP SW/CIRC
P0705
0705
—
—
×
ATF TEMP SEN/CIRC
P0710
0710
—
—
—
INPUT SPD SEN/CIRC
(IN PY SPD SEN/CIRC)*
8
P0715
0715
—
—
×
VEH SPD SEN/CIR AT*
7
P0720
0720
—
—
×
TCC SOLENOID/CIRC
P0740
0740
—
—
×
A/T TCC S/V FNCTN
P0744
0744
—
—
×
L/PRESS SOL/CIRC
P0745
0745
—
—
×
PRS CNT SOL/A FCTN
(—)*
8
P0746
0746
—
—
—
PRS CNT SOL/B FCTN
(—)*
8
P0776
0776
—
—
×
PRS CNT SOL/B CIRC
(—)*
8
P0778
0778
—
—
×
TR PRS SENS/A CIRC
(—)*
8
P0840
0840
—
—
×
TR PRS SENS/B CIRC
(—)*
8
P0845
0845
—
—
×
ECM BACK UP/CIRC
P1065
1065
—
—
×
INT/V TIM V/CIR-B1
P1111
1111
—
—
×
ETC ACTR
P1121
1121
—
—
—
ETC FUNCTION/CIRC
P1122
1122
—
—
—
ETC MOT PWR
P1124
1124
—
—
—
ETC MOT PWR
P1126
1126
—
—
—
ETC MOT
P1128
1128
—
—
—
INT/V TIM V/CIR-B2
P1136
1136
—
—
×
HO2S1 (B1)
P1143
1143
×
×
×
*
5
HO2S1 (B1)
P1144
1144
×
×
×
*
5
HO2S2 (B1)
P1146
1146
×
×
×
*
5
HO2S2 (B1)
P1147
1147
×
×
×
*
5
CLOSED LOOP-B1
P1148
1148
—
—
—
HO2S1 (B2)
P1163
1163
×
×
×
*
5
HO2S1 (B2)
P1164
1164
×
×
×
*
5
HO2S2 (B2)
P1166
1166
×
×
×
*
5
HO2S2 (B2)
P1167
1167
×
×
×
*
5
CLOSED LOOP-B2
P1168
1168
—
—
—
TCS C/U FUNCTN
P1211
1211
—
—
×
TCS/CIRC
P1212
1212
—
—
×
ENG OVER TEMP
P1217
1217
—
—
—
Items
(CONSULT-II screen terms)
DTC*
1
SRT code
Test value/
Test limit
(GST only)
1st trip DTC
Reference
page
CONSULT-II
GST*
2
ECM*
3
EC-72
ON BOARD DIAGNOSTIC (OBD) SYSTEM
Revision; 2004 April
2003 Murano
*1: 1st trip DTC No. is the same as DTC No.
*2: These numbers are prescribed by SAE J2012.
*3: In Diagnostic Test Mode II (Self-diagnostic results), these numbers are controlled by NISSAN.
*4: SRT code will not be set if the self-diagnostic result is NG.
*5: These are not displayed with GST.
*6: The troubleshooting for these DTCs need CONSULT-II.
*7: When the fail-safe operations for both self-diagnoses occur at the same time, the MIL illuminates.
*8: CONSULT-II screen terms are shown differently depending on the version of CONSULT-II card.
NOTE:
Regarding Z50 models, "B1" indicates bank 1, "B2" indicates bank 2.
CTP LEARNING
P1225
1225
—
—
×
CTP LEARNING
P1226
1226
—
—
×
SENSOR POWER/CIRC
P1229
1229
—
—
—
PURG VOLUME CONT/V
P1444
1444
—
—
×
VENT CONTROL VALVE
P1446
1446
—
—
×
ASCD SW
P1564
1564
—
—
—
ASCD BRAKE SW
P1572
1572
—
—
—
ASCD VHL SPD SEN
P1574
1574
—
—
—
NATS MALFUNCTION
P1610 -
P1615
1610 - 1615
—
—
×
CVT C/U FUNCT
P1700
1700
—
—
—
P-N POS SW/CIRCUIT
P1706
1706
—
—
×
IN PULY SPEED
P1715
1715
—
—
×
V/SP SEN (A/T OUT)
P1720
1720
—
—
×
LU-SLCT SOL/CIRC
(—)*
8
P1740
1740
—
—
×
STEP MOTR CIRC
P1777
1777
—
—
—
STEP MOTR FNC
P1778
1778
—
—
×
VIAS S/V CIRC
P1800
1800
—
—
×
BRAKE SW/CIRCUIT
P1805
1805
—
—
×
APP SEN 1/CIRC
P2122
2122
—
—
—
APP SEN 1/CIRC
P2123
2123
—
—
—
APP SEN 2/CIRC
P2127
2127
—
—
—
APP SEN 2/CIRC
P2128
2128
—
—
—
TP SENSOR
P2135
2135
—
—
—
APP SENSOR
P2138
2138
—
—
—
Items
(CONSULT-II screen terms)
DTC*
1
SRT code
Test value/
Test limit
(GST only)
1st trip DTC
Reference
page
CONSULT-II
GST*
2
ECM*
3
ON BOARD DIAGNOSTIC (OBD) SYSTEM
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DTC AND 1ST TRIP DTC
The 1st trip DTC (whose number is the same as the DTC number) is displayed for the latest self-diagnostic
result obtained. If the ECM memory was cleared previously, and the 1st trip DTC did not reoccur, the 1st trip
DTC will not be displayed.
If a malfunction is detected during the 1st trip, the 1st trip DTC is stored in the ECM memory. The MIL will not
light up (two trip detection logic). If the same malfunction is not detected in the 2nd trip (meeting the required
driving pattern), the 1st trip DTC is cleared from the ECM memory. If the same malfunction is detected in the
2nd trip, both the 1st trip DTC and DTC are stored in the ECM memory and the MIL lights up. In other words,
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
TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION"
For malfunctions in which 1st trip DTCs are displayed, refer to
EC-69, "EMISSION-RELATED DIAGNOSTIC
. 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 Mode 7 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 vehi-
cle 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 II, refer to
. 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, P1148, P1706, etc.
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, 1148, 1706, 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]”.
PBIB0911E
EC-74
ON BOARD DIAGNOSTIC (OBD) SYSTEM
Revision; 2004 April
2003 Murano
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, 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-129, "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
SION-RELATED DIAGNOSTIC INFORMATION"
.
SYSTEM READINESS TEST (SRT) CODE
System Readiness Test (SRT) code is specified in Mode 1 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.
Priority
Items
1
Freeze frame data
Misfire — DTC: P0300 - P0306
Fuel Injection System Function — DTC: P0171, P0172, P0174, P0175
2
Except the above items (Includes CVT related items)
3
1st trip freeze frame data
ON BOARD DIAGNOSTIC (OBD) SYSTEM
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SRT Item
The table below shows required self-diagnostic items to set the SRT to “CMPLT”.
*1: 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.
NG: Self-diagnosis is carried out and the result is NG.
SRT item
(CONSULT-II indica-
tion)
Perfor-
mance Pri-
ority*1
Required self-diagnostic items to set the SRT to “CMPLT”
Corresponding DTC
No.
CATALYST
2
Three way catalyst function
P0420, P0430
EVAP SYSTEM
1
EVAP control system
P0442
2
EVAP control system
P0456
2
EVAP control system purge flow monitoring
P0441
HO2S
2
Heated oxygen sensor 1
P0132, P0152
Heated oxygen sensor 1
P0133, P0153
Heated oxygen sensor 1
P0134, P0154
Heated oxygen sensor 1
P1143, P1163
Heated oxygen sensor 1
P1144, P1164
Heated oxygen sensor 2
P0138, P0158
Heated oxygen sensor 2
P0139, P0159
Heated oxygen sensor 2
P1146, P1166
Heated oxygen sensor 2
P1147, P1167
HO2S HTR
2
Heated oxygen sensor 1 heater
P0031, P0032, P0051,
P0052
Heated oxygen sensor 2 heater
P0037, P0038, P0057,
P0058
Self-diagnosis result
Example
Diagnosis
Ignition 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
—
NG
NG
(Consecutive
NG)
(1st trip)
DTC
1st trip DTC
—
1st trip DTC
DTC
(= MIL “ON”)
SRT of EGR
“INCMP”
“INCMP”
“INCMP”
“CMPLT”
EC-76
ON BOARD DIAGNOSTIC (OBD) SYSTEM
Revision; 2004 April
2003 Murano
—: Self-diagnosis is not carried out.
When all SRT related self-diagnoses showed OK results in a single cycle (Ignition OFF-ON-OFF), the SRT will
indicate “CMPLT”.
→
Case 1 above
When all SRT related self-diagnoses showed OK results through several different cycles, the SRT will indicate
“CMPLT” at the time the respective self-diagnoses have at least one OK result.
→
Case 2 above
If one or more SRT related self-diagnoses showed NG results in 2 consecutive cycles, the SRT will also indi-
cate “CMPLT”.
→
Case 3 above
The table above shows that the minimum number of cycles for setting SRT as “INCMP” is one (1) for each
self-diagnosis (Case 1 & 2) or two (2) for one of self-diagnoses (Case 3). However, in preparation for the state
emissions inspection, it is unnecessary for each self-diagnosis to be executed twice (Case 3) for the following
reasons:
●
The SRT will indicate “CMPLT” at the time the respective self-diagnoses have one (1) OK result.
●
The emissions inspection requires “CMPLT” of the SRT only with OK self-diagnosis results.
●
When, during SRT driving pattern, 1st trip DTC (NG) is detected prior to “CMPLT” of SRT, the self-diagno-
sis memory must be erased from ECM after repair.
●
If the 1st trip DTC is erased, all the SRT will indicate “INCMP”.
NOTE:
SRT can be set as “CMPLT” together with the DTC(s). Therefore, DTC check must always be carried out
prior to the state emission inspection even though the SRT indicates “CMPLT”.
SRT Service Procedure
If a vehicle has failed the state emissions inspection due to one or more SRT items indicating “INCMP”, review
the flowchart diagnostic sequence on the next page.
ON BOARD DIAGNOSTIC (OBD) SYSTEM
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How to Display SRT Code
WITH CONSULT-II
Selecting “SRT STATUS” in “DTC CONFIRMATION” mode with
CONSULT-II.
For items whose SRT codes are set, a “CMPLT” is displayed on the
CONSULT-II screen; for items whose SRT codes are not set,
“INCMP” is displayed.
A sample of CONSULT-II display for SRT code is shown at right.
“INCMP” means the self-diagnosis is incomplete and SRT is not set.
“CMPLT” means the self-diagnosis is complete and SRT is set.
WITH GST
Selecting Mode 1 with GST (Generic Scan Tool)
*1
*2
*3
SEF573XA
SEF935Z
EC-78
ON BOARD DIAGNOSTIC (OBD) SYSTEM
Revision; 2004 April
2003 Murano
How to Set SRT Code
To set all SRT codes, self-diagnosis for the items indicated above must be performed one or more times. Each
diagnosis may require a long period of actual driving under various conditions.
WITH CONSULT-II
Perform corresponding DTC Confirmation Procedure one by one based on “Performance Priority” in the table
on
WITHOUT CONSULT-II
The most efficient driving pattern in which SRT codes can be properly set is explained on the next page. The
driving pattern should be performed one or more times to set all SRT codes.
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