NISSAN LATIO 2009 Service Repair Manual

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1. Remove fuel pump fuse (1) located in IPDM E/R (2).
• : Vehicle front
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.
FUEL PRESSURE CHECK CAUTION:
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
pressure cannot be completely released because C11 models do not have fuel return system.
• The fuel hose connection method u sed when taking fuel pressure check must not be used for other
purposes.
• Be careful not to scratch or put debris around connection area when servicing, so that the quick
connector maintains sealability with O-rings inside.
• Do not perform fuel pressure check with electrical syst ems operating (i.e. lights, rear defogger, A/C,
etc.) Fuel pressure gauge may indicate false readin gs due to varying engine load and changes in
manifold vacuum.
1. Release fuel pressure to zero. Refer to "FUEL PRESSURE RELEASE".
2. Prepare fuel hose for fuel pressure check B and fuel tube adapter (KV10118400) D, then connect fuel pressure gauge A.
• : To quick connector
• : To fuel tube (engine side)
• C: Clamp
• Use suitable fuel hose for fuel pressure check (genuine
NISSAN fuel hose without quick connector).
• To avoid unnecessary force or tension to hose, use moder- ately long fuel hose for fuel pressure check.
• Do not use the fuel hose for checking fuel pressure with dam- age or cracks on it.
• Use Pressure Gauge to check fuel pressure.
3. Remove fuel hose. Refer to EM-156 .
• Do not twist or kink fuel hose because it is plastic hose.
4. Connect fuel hose for fuel pressure check (1) to fuel tube (engine side) with clamp (2) as shown in the figure.
• No.2 spool (5)
• Wipe off oil or dirt from hose insertion part using cloth moist-
ened with gasoline.
• Apply proper amount of gasoline between top of the fuel tube (3) and No.1 spool (4).
• Insert fuel hose for fuel pressure check until it touches the No.1 spool on fuel tube.
• Use NISSAN genuine hose clamp (part number: 16439 N4710
or 16439 40U00).
• When reconnecting fuel line, always use new clamps.
• Use a torque driver to tighten clamps.
• Install hose clamp to the positi on within 1 - 2 mm (0.04 - 0.08 in).
• Make sure that clamp screw does not contact adjacent parts.

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TROUBLE DIAGNOSIS
Trouble Diagnosis Introduction INFOID:0000000004537051
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 t he cause of the incidents. A road
test with CONSULT-III (or GST) or a circuit tester connected should
be performed. Follow the Work Flow on "WORK FLOW".
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 "Worksheet Sample" 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.
WORK FLOW MEF036D
SEF233G
SEF234G

EC
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- Study the relationship betw een the cause detected by DTC* 1
and the symptom described by the cus-
tomer. (Symptom Matrix Chart is useful. Refer to EC-583, " Symptom Matrix Chart " .)
3. Check related service bulletins for information.
Is any symptom described and any DTC detected? Symptom is described, DTC*
1
is displayed>>GO TO 3.
Symptom is described, DTC* 1
is not displayed>>GO TO 4.
Symptom is not described, DTC* 1
is displayed>>GO TO 5. DTC Inspection Priority Chart " and determine trouble
diagnosis order.
NOTE:
• Freeze frame data* 2
is useful if the DTC* 1
is not detected.
• Perform Overall Function Check if DTC Confirmation Procedure is not included on Service Manual. This
simplified check procedure is an effective alternative though DTC* 1
cannot be detected during this check.
If the result of Overall Function Check is NG, it is the same as the detection of DTC* 1
by DTC Confirmation
Procedure.
Is DTC* Yes >> GO TO 10.
No >> Check according to EC-626 .
Basic Inspection " .
With CONSULT-III>>GO TO 7.
Without CONSULT-III>>GO TO 9. Inspection Procedure " .
Are they within the SP value? Yes >> GO TO 9.

Diagnosis Procedure " .
Is malfunctioning part detected? Yes >> GO TO 11.
No >> GO TO 9. Symptom Matrix Chart " based on the confirmed symp-
tom in step 4, and determine the trouble diagnosis order based on possible causes and symptom.
>> GO TO 10. 25, " How to Perform Efficient Diagnosis for an Electrical Incident " .
Is malfunctioning part detected? Yes >> GO TO 11.
No >> Monitor input data from related sensors or check voltage of related ECM terminals using CON-
SULT-III. Refer to EC-597, " ECM Terminal and Reference Value " ,
EC-614, " CONSULT-III Refer-
ence Value in Data Monitor Mode " .
Emission-related Diagnostic Information " .
>> GO TO 12. NG (DTC*
1
is detected)>>GO TO 10.
NG (Symptom remains)>>GO TO 6.
OK >> 1. Before returning the vehicle to the customer, make sure to erase unnecessary DTC* 1
in ECM
and TCM (Transmission Control Module). (Refer to EC-542, " Emission-related Diagnostic
Information " and
AT-39, " OBD-II Diagnostic Trouble Code (DTC) " ,
CVT-209, " OBD-II Diag-
nostic Trouble Code (DTC) " .)
2. If the completion of SRT is needed, drive vehicl e under the specific driving pattern. Refer to
EC-542, " Emission-related Diagnostic Information " .
3. INSPECTION END
*1: Include 1st trip DTC.
*2: Include 1st trip freeze frame data.
DIAGNOSTIC WORKSHEET
Description

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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 MI L to come on steady or blink and
DTC to be detected. Examples:
• Vehicle ran out of fuel, which caused the engine to misfire.
• Fuel filler cap was left off or incorrectly screwed on, allowing fuel to evaporate into the atmosphere.
Worksheet Sample
DTC Inspection Priority Chart INFOID:0000000004537052
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart. SEF907L
MTBL0017

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.

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• When there is an open circuit on MIL circuit, the ECM c
annot warn the driver by lighting up MIL when there
is malfunction on engine control system.
Therefore, when electrical controlled throttle and pa rt 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 diagnos es except MIL circuit are detected and demands the
driver to repair the malfunction.
Symptom Matrix Chart INFOID:0000000004537054
SYSTEM — BASIC ENGINE CONTROL SYSTEM P0117
P0118 Engine coolant temperature
sensor circuit Engine coolant temperature will be determined by ECM based on the following condi-
tion.
CONSULT-III displays the engine coolant temperature decided by ECM.
Condition Engine coolant temperature decided
(CONSULT-III display)
Just as ignition switch is turned ON
or START 40
°C (104 °F)
Approx. 4 minutes or more after
engine sarting. 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 cool-
ing 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.
P0643 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.
P2100
P2103 Throttle control relay ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P2101 Electric throttle control func- tion ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P2118 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.
P2119 Electric throttle control actu- ator (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 ac tuator 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 (A/T, CVT), Neutral (M/T) position, and engine speed
will not exceed 1,000 rpm or more.
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.
DTC No. Detected items Engine operating condition in fail-safe mode
Engine operating condition in fail-safe mode Engine speed will not rise more than 2,500 rpm due to the fuel cut

Fuel pressure regulator system 3 3 4 4 4 4 4 4 4 4
EC-574Fuel injector circuit 1 1 2 3 2 2 2 2
EC-986Evaporative emission system 3 3 4 4 4 4 4 4 4 4
EC-527Air Positive crankcase ventilation sys-
tem 3 34 4 4 4 4 4 4 4 1
EC-538Incorrect idle speed adjustment 1 1 1 1 1
EC-566Electric throttle control actuator 1 1 2 3 3 2 2 2 2 2 2
EC-929 ,
EC-940 Ignition Incorrect ignition timing adjustment 3 3 1 1 1 1 1 1
EC-566Ignition circuit 1 1 2 2 2 2 2 2
EC-996Main power supply and ground circuit 2 2 3 3 3 3 3 2 3
EC-627Mass air flow sensor circuit
1
1 2 2
2 2 2 2 EC-655 ,
EC-663 Engine coolant temperature sensor circuit
33 3
EC-674 ,
EC-684 Air fuel ratio (A/F) sensor 1 circuit
EC-692 ,
EC-698 ,
EC-704 ,
EC-710 ,
EC-966 Throttle position sensor circuit
2 2EC-679 ,
EC-760 ,
EC-895 ,
EC-897 ,
EC-954 Accelerator pedal position sensor circuit 3 2 1
EC-874 ,
EC-942 ,
EC-947 ,
EC-959 Knock sensor circuit 2 3
EC-771Crankshaft position sensor (POS) circuit 2 2
EC-775Camshaft position sens
or (PHASE) circuit 3 2 EC-781Vehicle speed signal circuit 2 3 3 3
EC-866ECM 2 2 3 3 3 3 3 3 3 3 3
EC-872