Nissan Murano Z50 (2004 year). Manual — part 72
ON BOARD DIAGNOSTIC (OBD) SYSTEM
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ON BOARD DIAGNOSTIC SYSTEM FUNCTION
The on board diagnostic system has the following four functions.
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.
The fail-safe function also operates when above diagnoses except MIL circuit are detected and demands the
driver to repair the malfunction.
MIL Flashing Without DTC
If the ECM is in Diagnostic Test Mode II, MIL may flash when engine is running. In this case, check ECM diag-
nostic test mode.
EC-63, "HOW TO SWITCH DIAGNOSTIC TEST MODE"
How to switch the diagnostic test (function) modes, and details of the above functions are described later.
63, "HOW TO SWITCH DIAGNOSTIC TEST MODE"
The following emission-related diagnostic information is cleared when the ECM memory is erased.
●
Diagnostic trouble codes
●
1st trip diagnostic trouble codes
●
Freeze frame data
●
1st trip freeze frame data
●
System readiness test (SRT) codes
●
Test values
●
Others
HOW TO SWITCH DIAGNOSTIC TEST MODE
NOTE:
●
It is better to count the time accurately with a clock.
Diagnostic Test
Mode
KEY and ENG.
Status
Function
Explanation of Function
Mode I
Ignition switch in
ON position
Engine stopped
BULB 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
WARNING
This 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 stopped
SELF-DIAGNOSTIC
RESULTS
This 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-64
ON BOARD DIAGNOSTIC (OBD) SYSTEM
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●
It is impossible to switch the diagnostic mode when an accelerator pedal position sensor circuit
has a malfunction.
●
Always ECM returns to Diagnostic Test Mode I after ignition switch is turned OFF.
How to Set Diagnostic Test Mode II (Self-diagnostic Results)
1.
Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.
2.
Repeat the following procedure quickly five times within 5 seconds.
a.
Fully depress the accelerator pedal.
b.
Fully release the accelerator pedal.
3.
Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds until the MIL starts
blinking.
4.
Fully release the accelerator pedal.
ECM has entered to Diagnostic Test Mode II (Self-diagnostic results).
How to Erase Diagnostic Test Mode II (Self-diagnostic Results)
1.
Set ECM in Diagnostic Test Mode II (Self-diagnostic results). Refer to
EC-64, "How to Set Diagnostic Test
Mode II (Self-diagnostic Results)"
.
2.
Fully depress the accelerator pedal and keep it for more than 10 seconds.
The emission-related diagnostic information has been erased from the backup memory in the ECM.
3.
Fully release the accelerator pedal, and confirm the DTC 0000 is displayed.
DIAGNOSTIC TEST MODE I — BULB CHECK
In this mode, the MIL on the instrument panel should stay ON. If it remains OFF, check the bulb. Refer to
DIAGNOSTIC TEST MODE I — MALFUNCTION WARNING
This DTC number is clarified in Diagnostic Test Mode II (SELF-DIAGNOSTIC RESULTS)
DIAGNOSTIC TEST MODE II — SELF-DIAGNOSTIC RESULTS
In this mode, the DTC and 1st trip DTC are indicated by the number of blinks of the MIL as shown below.
The DTC and 1st trip DTC are displayed at the same time. If the MIL does not illuminate in diagnostic test
mode I (Malfunction warning), all displayed items are 1st trip DTCs. If only one code is displayed when the MIL
illuminates in diagnostic test mode II (SELF-DIAGNOSTIC RESULTS), it is a DTC; if two or more codes are
displayed, they may be either DTCs or 1st trip DTCs. DTC No. is same as that of 1st trip DTC. These uniden-
PBIB0092E
MIL
Condition
ON
When the malfunction is detected.
OFF
No malfunction.
ON BOARD DIAGNOSTIC (OBD) SYSTEM
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tified codes can be identified by using the CONSULT-II or GST. A DTC will be used as an example for how to
read a code.
A particular trouble code can be identified by the number of four-digit numeral flashes. The “zero” is indicated
by the number of ten flashes. The length of time the 1,000th-digit numeral flashes on and off is 1.2 seconds
consisting of an ON (0.6-second) - OFF (0.6-second) cycle.
The 100th-digit numeral and lower digit numerals consist of a 0.3-second ON and 0.3-second OFF cycle.
A change from one digit numeral to another occurs at an interval of 1.0-second OFF. In other words, the later
numeral appears on the display 1.3 seconds after the former numeral has disappeared.
A change from one trouble code to another occurs at an interval of 1.8-second OFF.
In this way, all the detected malfunctions are classified by their DTC numbers. The DTC 0000 refers to no mal-
function. (See
How to Erase Diagnostic Test Mode II (Self-diagnostic Results)
The DTC can be erased from the back up memory in the ECM by depressing accelerator pedal. Refer to
64, "How to Erase Diagnostic Test Mode II (Self-diagnostic Results)"
.
●
If the battery is disconnected, the DTC will be lost from the backup memory within 24 hours.
●
Be careful not to erase the stored memory before starting trouble diagnoses.
OBD System Operation Chart
ABS004AR
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
.
●
The MIL will go off after the vehicle is driven 3 times 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.
PBIA3905E
EC-66
ON BOARD DIAGNOSTIC (OBD) SYSTEM
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SUMMARY CHART
For details about patterns B and C under “Fuel Injection System” and “Misfire”, see
.
For details about patterns A and B under Other, see
*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), *1
1 (pattern C), *1
1 (pattern B)
1st Trip Freeze Frame Data
(clear)
*1, *2
*1, *2
1 (pattern B)
ON BOARD DIAGNOSTIC (OBD) SYSTEM
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RELATIONSHIP BETWEEN MIL, DTC, 1ST TRIP DTC AND DRIVING PATTERNS FOR “MISFIRE
” <EXHAUST QUALITY DETERIORATION>, “FUEL INJECTION SYSTEM”
*1: When the same malfunction is
detected in two consecutive trips,
MIL will light up.
*2: MIL will go off after vehicle is driven
3 times (pattern B) without any mal-
functions.
*3: When the same malfunction is
detected in two consecutive trips, the
DTC and the freeze frame data will
be stored in ECM.
*4: The DTC and the freeze frame data
will not be displayed any longer after
vehicle is driven 80 times (pattern C)
without the same malfunction. (The
DTC and the freeze frame data still
remain in ECM.)
*5: When a malfunction is detected for
the first time, the 1st trip DTC and
the 1st trip freeze frame data will be
stored in ECM.
*6: The 1st trip DTC and the 1st trip
freeze frame data will be cleared at
the moment OK is detected.
*7: When the same malfunction is
detected in the 2nd trip, the 1st trip
freeze frame data will be cleared.
*8: 1st trip DTC will be cleared when
vehicle is driven once (pattern C)
without the same malfunction after
DTC is stored in ECM.
SEF392S
EC-68
ON BOARD DIAGNOSTIC (OBD) SYSTEM
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EXPLANATION FOR DRIVING PATTERNS FOR “MISFIRE <EXHAUST QUALITY DETERIORA-
TION>”, “FUEL INJECTION SYSTEM”
<Driving Pattern B>
Driving pattern B means the vehicle operation as follows:
All components and systems should be monitored at least once by the OBD system.
●
The B counter will be cleared when the malfunction is detected once regardless of the driving pattern.
●
The B counter will be counted up when driving pattern B is satisfied without any malfunction.
●
The MIL will go off when the B counter reaches 3. (*2 in “OBD SYSTEM OPERATION CHART”)
<Driving Pattern C>
Driving pattern C means the vehicle operation as follows:
The following conditions should be satisfied at the same time:
Engine speed: (Engine speed in the freeze frame data)
±
375 rpm
Calculated load value: (Calculated load value in the freeze frame data) x (1
±
0.1) [%]
Engine coolant temperature (T) condition:
●
When the freeze frame data shows lower than 70
°
C (158
°
F), T should be lower than 70
°
C (158
°
F).
●
When the freeze frame data shows higher than or equal to 70
°
C (158
°
F), T should be higher than or equal
to 70
°
C (158
°
F).
Example:
If the stored freeze frame data is as follows:
Engine speed: 850 rpm, Calculated load value: 30%, Engine coolant temperature: 80
°
C (176
°
F)
To be satisfied with driving pattern C, the vehicle should run under the following conditions:
Engine speed: 475 - 1,225 rpm, Calculated load value: 27 - 33%, Engine coolant temperature: more than 70
°
C
(158
°
F)
●
The C counter will be cleared when the malfunction is detected regardless of vehicle conditions above.
●
The C counter will be counted up when vehicle conditions above is satisfied without the same malfunction.
●
The DTC will not be displayed after C counter reaches 80.
●
The 1st trip DTC will be cleared when C counter is counted once without the same malfunction after DTC
is stored in ECM.
ON BOARD DIAGNOSTIC (OBD) SYSTEM
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RELATIONSHIP BETWEEN MIL, DTC, 1ST TRIP DTC AND DRIVING PATTERNS EXCEPT FOR
“MISFIRE <EXHAUST QUALITY DETERIORATION>”, “FUEL INJECTION SYSTEM”
*1: When the same malfunction is
detected in two consecutive trips,
MIL will light up.
*2: MIL will go off after vehicle is driven
3 times (pattern B) without any mal-
functions.
*3: When the same malfunction is
detected in two consecutive trips, the
DTC and the freeze frame data will
be stored in ECM.
*4: The DTC and the freeze frame data
will not be displayed any longer after
vehicle is driven 40 times (pattern A)
without the same malfunction.
(The DTC and the freeze frame data
still remain in ECM.)
*5: When a malfunction is detected for
the first time, the 1st trip DTC and
the 1st trip freeze frame data will be
stored in ECM.
*6: 1st trip DTC will be cleared after
vehicle is driven once (pattern B)
without the same malfunction.
*7: When the same malfunction is
detected in the 2nd trip, the 1st trip
freeze frame data will be cleared.
SEF393SD
EC-70
ON BOARD DIAGNOSTIC (OBD) SYSTEM
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EXPLANATION FOR DRIVING PATTERNS EXCEPT FOR “MISFIRE <EXHAUST QUALITY
DETERIORATION>”, “FUEL INJECTION SYSTEM”
<Driving Pattern A>
●
The A counter will be cleared when the malfunction is detected regardless of (1) - (4).
●
The A counter will be counted up when (1) - (4) are satisfied without the same malfunction.
●
The DTC will not be displayed after the A counter reaches 40.
<Driving Pattern B>
Driving pattern B means the vehicle operation as follows:
All components and systems should be monitored at least once by the OBD system.
●
The B counter will be cleared when the malfunction is detected once regardless of the driving pattern.
●
The B counter will be counted up when driving pattern B is satisfied without any malfunctions.
●
The MIL will go off when the B counter reaches 3 (*2 in OBD SYSTEM OPERATION CHART).
AEC574
TROUBLE DIAGNOSIS
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TROUBLE DIAGNOSIS
PFP:00004
Trouble Diagnosis Introduction
ABS004AS
INTRODUCTION
The engine has an ECM to control major systems such as fuel con-
trol, ignition control, idle air control system, etc. The ECM accepts
input signals from sensors and instantly drives actuators. It is essen-
tial that both input and output signals are proper and stable. At the
same time, it is important that there are no malfunctions such as vac-
uum leaks, fouled spark plugs, or other malfunctions with the engine.
It is much more difficult to diagnose an incident that occurs intermit-
tently rather than continuously. Most intermittent incidents are
caused by poor electric connections or improper wiring. In this case,
careful checking of suspected circuits may help prevent the replace-
ment of good parts.
A visual check only may not find the cause of the incidents. A road
test with CONSULT-II (or GST) or a circuit tester connected should
be performed. Follow the Work Flow on
Before undertaking actual checks, take a few minutes to talk with a
customer who approaches with a driveability complaint. The cus-
tomer can supply good information about such incidents, especially
intermittent ones. Find out what symptoms are present and under
what conditions they occur. A Diagnostic Worksheet like the example
on
should be used.
Start your diagnosis by looking for conventional malfunctions first.
This will help troubleshoot driveability malfunctions on an electroni-
cally controlled engine vehicle.
MEF036D
SEF233G
SEF234G
EC-72
TROUBLE DIAGNOSIS
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WORK FLOW
Flow Chart
*1
If time data of “SELF-DIAG
RESULTS” is other than [0] or [1t],
perform
NOSIS FOR INTERMITTENT INCI-
DENT"
.
*2
If the incident cannot be verified, per-
form
SIS FOR INTERMITTENT
INCIDENT"
*3
If the on board diagnostic system
cannot be performed, check main
power supply and ground circuit.
Refer to
*4
If malfunctioning part cannot be
detected, perform
BLE DIAGNOSIS FOR INTERMIT-
TENT INCIDENT"
*5
*6
PBIB1043E
TROUBLE DIAGNOSIS
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Description for Work Flow
DIAGNOSTIC WORKSHEET
Description
There are many operating conditions that lead to the malfunction of
engine components. A good grasp of such conditions can make trou-
bleshooting faster and more accurate.
In general, each customer feels differently about a incident. It is
important to fully understand the symptoms or conditions for a cus-
tomer complaint.
Utilize a diagnostic worksheet like the one on the next page in order
to organize all the information for troubleshooting.
Some conditions may cause the MIL to come on steady or blink and
DTC to be detected. Examples:
●
Vehicle ran out of fuel, which caused the engine to misfire.
STEP
DESCRIPTION
STEP I
Get detailed information about the conditions and the environment when the incident/symptom occurred using the
“DIAGNOSTIC WORK SHEET”,
STEP II
Before confirming the concern, check and write down (print out using CONSULT-II or GST) the (1st trip) DTC and the
(1st trip) freeze frame data, then erase the DTC and the data. (Refer to
.) The (1st trip) DTC and the (1st trip)
freeze frame data can be used when duplicating the incident at STEP III & IV.
If the incident cannot be verified, perform
EC-130, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
Study the relationship between the cause, specified by (1st trip) DTC, and the symptom described by the customer.
(The Symptom Matrix Chart will be useful. See
.)
Also check related service bulletins for information.
STEP III
Try to confirm the symptom and under what conditions the incident occurs.
The DIAGNOSTIC WORK SHEET and the freeze frame data are useful to verify the incident. Connect CONSULT-II
to the vehicle in “DATA MONITOR (AUTO TRIG) ”mode and check real time diagnosis results.
If the incident cannot be verified, perform
EC-130, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
If the malfunction code is detected, skip STEP IV and perform STEP V.
STEP IV
Try to detect the (1st trip) DTC by driving in (or performing) the DTC Confirmation Procedure. Check and read the (1st
trip) DTC and (1st trip) freeze frame data by using CONSULT-II or GST.
During the (1st trip) DTC verification, be sure to connect CONSULT-II to the vehicle in “DATA MONITOR (AUTO
TRIG) ”mode and check real time diagnosis results.
If the incident cannot be verified, perform
EC-130, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
In case the DTC Confirmation Procedure is not available, perform the Overall Function Check instead. The (1st trip)
DTC cannot be displayed by this check, however, this simplified check is an effective alternative.
The NG result of the Overall Function Check is the same as the (1st trip) DTC detection.
STEP V
Take the appropriate action based on the results of STEP I through IV.
If the malfunction code is indicated, proceed to TROUBLE DIAGNOSIS FOR DTC PXXXX.
If the normal code is indicated, proceed to the BASIC INSPECTION. (Refer to
according to the Symptom Matrix Chart. (Refer to
STEP VI
Identify where to begin diagnosis based on the relationship study between symptom and possible causes. Inspect the
system for mechanical binding, loose connectors or wiring damage using (tracing) Harness Layouts.
Gently shake the related connectors, components or wiring harness with CONSULT-II set in “DATA MONITOR
(AUTO TRIG)” mode.
Check the voltage of the related ECM terminals or monitor the output data from the related sensors with CONSULT-II.
Refer to
The Diagnostic Procedure in EC section contains a description based on open circuit inspection. A short circuit
inspection is also required for the circuit check in the Diagnostic Procedure. For details, refer to Circuit Inspection in
GI-26, "How to Perform Efficient Diagnosis for an Electrical Incident"
Repair or replace the malfunction parts.
If malfunctioning part cannot be detected, perform
EC-130, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCI-
.
STEP VII
Once you have repaired the circuit or replaced a component, you need to run the engine in the same conditions and
circumstances which resulted in the customer's initial complaint.
Perform the DTC Confirmation Procedure and confirm the normal code [DTC No. P0000] is detected. If the incident is
still detected in the final check, perform STEP VI by using a method different from the previous one.
Before returning the vehicle to the customer, be sure to erase the unnecessary (already fixed) (1st trip) DTC in ECM
and TCM (Transmission control module). (Refer to
EC-61, "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC
and
SEF907L
EC-74
TROUBLE DIAGNOSIS
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●
Fuel filler cap was left off or incorrectly screwed on, allowing fuel to evaporate into the atmosphere.
Worksheet Sample
MTBL0017
TROUBLE DIAGNOSIS
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DTC Inspection Priority Chart
ABS004AT
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
NOTE:
If DTC U1000 and/or U1001 is displayed with other DTC, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to
.
Priority
Detected items (DTC)
1
●
U1000 U1001 CAN communication line
●
P0101 P0102 P0103 Mass air flow sensor
●
P0112 P0113 P0127 Intake air temperature sensor
●
P0117 P0118 P0125 Engine coolant temperature sensor
●
P0128 Thermostat function
●
P0122 P0123 P0222 P0223 P1225 P1226 P2135 Throttle position sensor
●
P0181 P0182 P0183 Fuel tank temperature sensor
●
P0327 P0328 Knock sensor
●
P0335 Crankshaft position sensor (POS)
●
P0340 P0345 Camshaft position sensor (PHASE)
●
P0460 P0461 P0462 P0463 Fuel level sensor
●
P0500 Vehicle speed sensor
●
P0605 ECM
●
P0705 Park/Neutral position (PNP) switch
●
P1229 Sensor power supply
●
P1610 - P1615 NATS
●
P1700 CVT control system
●
P1706 Park/Neutral position (PNP) switch
●
P2122 P2123 P2127 P2128 P2138 Accelerator pedal position sensor
EC-76
TROUBLE DIAGNOSIS
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2
●
P0037 P0038 P0057 P0058 Heated oxygen sensor 2 heater
●
P0138 P0139 P0158 P0159 P1146 P1147 P1166 P1167 Heated oxygen sensor 2
●
P0441 EVAP control system purge flow monitoring
●
P0444 P0445 P1444 EVAP canister purge volume control solenoid valve
●
P0447 P1446 EVAP canister vent control valve
●
P0451 P0452 P0453 EVAP control system pressure sensor
●
P0550 Power steering pressure sensor
●
P0710 P0715 P0720 P0740 P0744 P0745 P0746 P0776 P0778 P0840 P0845 P1740 CVT related sensors, solenoid
valves and switches
●
P1031 P1032 P1051 P1052 A/F sensor 1 heater
●
P1065 ECM power supply
●
P1111 P1136 Intake valve timing control solenoid valve
●
P1122 Electric throttle control function
●
P1124 P1126 P1128 Electric throttle control actuator
●
P1217 Engine over temperature (OVERHEAT)
●
P1271 P1272 P1273 P1274 P1276 P1278 P1279 P1281 P1282 P1283 P1284 P1286 P1288 P1289 A/F sensor 1
●
P1720 Vehicle speed sensor
●
P1777 P1778 CVT step motor
●
P1805 Brake switch
3
●
P0011 P0021 Intake valve timing control
●
P0171 P0172 P0174 P0175 Fuel injection system function
●
P0300 - P0306 Misfire
●
P0420 P0430 Three way catalyst function
●
P0442 P0456 EVAP control system
●
P0506 P0507 Idle speed control system
●
P1121 Electric throttle control actuator
●
P1148 P1168 Closed loop control
●
P1211 TCS control unit
●
P1212 TCS communication line
●
P1564 ASCD steering switch
●
P1572 ASCD brake switch
●
P1574 ASCD vehicle speed sensor
●
P1715 Primary speed sensor
●
P1800 VIAS control solenoid valve
Priority
Detected items (DTC)
TROUBLE DIAGNOSIS
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Fail-Safe Chart
ABS004AU
When the DTC listed below is detected, the ECM enters fail-safe mode and the MIL lights up.
●
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.
The fail-safe function also operates when above diagnoses except MIL circuit are detected and demands
the driver to repair the malfunction.
DTC No.
Detected items
Engine operating condition in fail-safe mode
P0102
P0103
Mass air flow sensor circuit
Engine speed will not rise more than 2,400 rpm due to the fuel cut.
P0117
P0118
Engine coolant tempera-
ture sensor circuit
Engine coolant temperature will be determined by ECM based on the time after turning
ignition switch ON or START.
CONSULT-II displays the engine coolant temperature decided by ECM.
Condition
Engine coolant temperature decided
(CONSULT-II display)
Just as ignition switch is turned
ON or Start
40
°
C (104
°
F)
More than approx. 4 minutes after
ignition ON or Start
80
°
C (176
°
F)
Except as shown above
40 - 80
°
C (104 - 176
°
F)
(Depends on the time)
When the fail-safe system for engine coolant temperature sensor is activated, the cooling
fan operates while engine is running.
P0122
P0123
P0222
P0223
P2135
Throttle position sensor
The ECM controls the electric throttle control actuator in regulating the throttle opening in
order for the idle position to be within +10 degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal
condition.
So, the acceleration will be poor.
P1121
Electric throttle control
actuator
(When electric throttle control actuator does not function properly due to the return spring
malfunction:)
ECM controls the electric throttle actuator by regulating the throttle opening around the
idle position. The engine speed will not rise more than 2,000 rpm.
(When throttle valve opening angle in fail-safe mode is not in specified range:)
ECM controls the electric throttle control actuator by regulating the throttle opening to 20
degrees or less.
(When ECM detects the throttle valve is stuck open:)
While the vehicle is driving, it slows down gradually by fuel cut. After the vehicle stops,
the engine stalls.
The engine can restart in N or P position, and engine speed will not exceed 1,000 rpm or
more.
P1122
Electric throttle control
function
ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P1124
P1126
Throttle control motor relay
ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P1128
Throttle control motor
ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P1229
Sensor power supply
ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P2122
P2123
P2127
P2128
P2138
Accelerator pedal position
sensor
The ECM controls the electric throttle control actuator in regulating the throttle opening in
order for the idle position to be within +10 degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal
condition.
So, the acceleration will be poor.
Engine operating condition in fail-safe mode
Engine speed will not rise more than 2,500 rpm due to the fuel cut
EC-78
TROUBLE DIAGNOSIS
Revision: 2004 November
2004 Murano
Basic Inspection
ABS004AV
1.
INSPECTION START
1.
Check service records for any recent repairs that may indicate a related malfunction, or a current need for
scheduled maintenance.
2.
Open engine hood and check the following:
–
Harness connectors for improper connections
–
Wiring harness for improper connections, pinches and cut
–
Vacuum hoses for splits, kinks and improper connections
–
Hoses and ducts for leaks
–
Air cleaner clogging
–
Gasket
3.
Confirm that electrical or mechanical loads are not applied.
–
Headlamp switch is OFF.
–
Air conditioner switch is OFF.
–
Rear window defogger switch is OFF.
–
Steering wheel is in the straight-ahead position, etc.
4.
Start engine and warm it up until engine coolant temperature
indicator points the middle of gauge.
Ensure engine stays below 1,000 rpm.
5.
Run engine at about 2,000 rpm for about 2 minutes under no-
load.
6.
Make sure that no DTC is displayed with CONSULT-II or GST.
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 2.
2.
REPAIR OR REPLACE
Repair or replace components as necessary according to corresponding Diagnostic Procedure.
>> GO TO 3.
SEF983U
SEF976U
SEF977U
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