2008 NISSAN LATIO relay

AIR CONDITIONING CUT CONTROL
EC-27
< SERVICE INFORMATION >
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AIR CONDITIONING CUT CONTROL
Input/Output Signal ChartINFOID:0000000001702558
*1: This signal is sent to the ECM through CAN communication line.
*2: ECM determines the start signal status by the signals of engine speed and battery voltage.
System DescriptionINFOID:0000000001702559
This system improves engine operation when the air conditioner is used.
Under the following conditions, the air conditioner is turned off.
• When the accelerator pedal is fully depressed.
• When cranking the engine.
• At high engine speeds.
• When the engine coolant temperature becomes excessively high.
• When operating power steering during low engine speed or low vehicle speed.
• When engine speed is excessively low.
• When refrigerant pressure is excessively low or high.
Sensor Input Signal to ECM ECM function Actuator
Air conditioner switch
Air conditioner ON signal*
1
Air conditioner
cut controlAir conditioner relay Accelerator pedal position sensor Accelerator pedal position
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)Engine speed*
2
Engine coolant temperature sensor Engine coolant temperature
Battery
Battery voltage*
2
Refrigerant pressure sensor Refrigerant pressure
EPS control unit
Power steering operation*
1
Wheel sensor
Vehicle speed*1

ON BOARD REFUELING VAPOR RECOVERY (ORVR)
EC-41
< SERVICE INFORMATION >
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1. Remove fuel tank. Refer to FL-9.
2. Drain fuel from the tank as follows:
a. Remove fuel feed hose located on the fuel gauge retainer.
b. Connect a spare fuel hose, one side to fuel gauge retainer where the hose was removed and the other
side to a fuel container.
c. Drain fuel using “FUEL PUMP RELAY” in “ACTIVE TEST” mode with CONSULT-II.
3. Check refueling EVAP vapor cut valve for being stuck to close as follows.
Blow air into the refueling EVAP vapor cut valve (from the end of EVAP/ORVR line hose), and check that
the air flows freely into the tank.
4. Check refueling EVAP vapor cut valve for being stuck to open as follows.
a. Connect vacuum pump to hose end.
b. Remove fuel gauge retainer with fuel gauge unit.
Always replace O-ring with new one.
c. Put fuel tank upside down.
d. Apply vacuum pressure to hose end [−13.3 kPa (−100 mmHg, −3.94 inHg)] with fuel gauge retainer
remaining open and check that the pressure is applicable.
Without CONSULT-II
1. Remove fuel tank. Refer to FL-9.
2. Drain fuel from the tank as follows:
a. Remove fuel gauge retainer.
b. Drain fuel from the tank using a handy pump into a fuel container.
3. Check refueling EVAP vapor cut valve for being stuck to close as follows.
Blow air into the refueling EVAP vapor cut valve (from the end of EVAP/ORVR line hose), and check that
the air flows freely into the tank.
4. Check refueling EVAP vapor cut valve for being stuck to open as follows.
a. Connect vacuum pump to hose end.
1. Filler tube 2. Recirculation line 3. EVAP/ORVR line
4. Vacuum/pressure handy pump 5. Fuel tank
BBIA0694E

TROUBLE DIAGNOSIS
EC-87
< SERVICE INFORMATION >
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Fail-Safe ChartINFOID:0000000001702588
When the DTC listed below is detected, the ECM enters fail-safe mode and the MIL lights up.
Priority Detected items (DTC)
1 • U1000 U1001 CAN communication line
• U1010 CAN communication
• P0101 P0102 P0103 Mass air flow sensor
• P0112 P0113 P0127 Intake air temperature sensor
• P0117 P0118 P0125 Engine coolant temperature sensor
• P0122 P0123 P0222 P0223 P1225 P1226 P2135 Throttle position sensor
• P0128 Thermostat function
• P0181 P0182 P0183 Fuel tank temperature sensor
• P0327 P0328 Knock sensor
• P0335 Crankshaft position sensor (POS)
• P0340 Camshaft position sensor (PHASE)
• P0460 P0461 P0462 P0463 Fuel level sensor
• P0500 Vehicle speed sensor
• P0605 ECM
• P0643 Sensor power supply
• P0705 P0850 Park/neutral position (PNP) switch
• P1610 - P1615 NATS
• P2122 P2123 P2127 P2128 P2138 Accelerator pedal position sensor
2 • P0031 P0032 Air fuel ratio (A/F) sensor 1 heater
• P0037 P0038 Heated oxygen sensor 2 heater
• P0075 Intake valve timing control solenoid valve
• P0130 P0131 P0132 P0133 P2A00 Air fuel ratio (A/F) sensor 1
• P0137 P0138 P0139 Heated oxygen sensor 2
• P0441 EVAP control system purge flow monitoring
• P0443 P0444 P0445 EVAP canister purge volume control solenoid valve
• P0447 P0448 EVAP canister vent control valve
• P0451 P0452 P0453 EVAP control system pressure sensor
• P1217 Engine over temperature (OVERHEAT)
• P1805 Brake switch
• P2100 P2103 Throttle control motor relay
• P2101 Electric throttle control function
• P2118 Throttle control motor
3 • P0011 Intake valve timing control
• P0171 P0172 Fuel injection system function
• P0300 - P0304 Misfire
• P0420 Three way catalyst function
• P0442 P0456 EVAP control system (SMALL LEAK, VERY SMALL LEAK)
• P0455 EVAP control system (GROSS LEAK)
• P0506 P0507 Idle speed control system
• P0710 P0715 P0720 P0725 P0731 P0732 P0733 P0734 P0740 P0744 P0745 P0746 P0750 P0755 P0776 P0778
P0840 P0845 P1705 P1740 P1760 P1777 P1778 A/T or CVT related sensors, solenoid valves and switches
• P1148 Closed loop control
• P1421 Cold start control
• P1564 ASCD steering switch
• P1572 ASCD brake switch
• P1574 ASCD vehicle speed sensor
• P1715 Turbine revolution sensor (A/T), Primary speed sensor (CVT)
• P2119 Electric throttle control actuator
DTC No. Detected items Engine operating condition in fail-safe mode
P0102
P0103Mass air flow sensor circuit Engine speed will not rise more than 2,400 rpm due to the fuel cut.

EC-88
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
• 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.
Symptom Matrix ChartINFOID:0000000001702589
SYSTEM — BASIC ENGINE CONTROL SYSTEM
P0117
P0118Engine coolant temperature
sensor circuitEngine 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.
ConditionEngine coolant temperature decided
(CONSULT-II display)
Just as ignition switch is turned ON
or START40°C (104°F)
More than approx. 4 minutes after
ignition ON or START80°C (176°F)
Except as shown above40 - 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
P2135Throttle 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
P2103Throttle 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-
tionECM 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 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 (A/T, CVT), Neutral (M/T) position, and engine speed
will not exceed 1,000 rpm or more.
P2122
P2123
P2127
P2128
P2138Accelerator pedal position
sensorThe 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

EC-104
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
15 Y Throttle control motor relay[Ignition switch: OFF]BATTERY VOLTAGE
(11 - 14V)
[Ignition switch: ON]0 - 1.0V
17
18
21
22R
LG
G
SBIgnition signal No. 1
Ignition signal No. 2
Ignition signal No. 4
Ignition signal No. 3[Engine is running]
•Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes depending on rpm
at idle.0 - 0.3V
[Engine is running]
• Warm-up condition
• Engine speed: 2,500 rpm.0.2 - 0.5V
23 GR Fuel pump relay[Ignition switch: ON]
• For 1 second after turning ignition switch
ON
[Engine is running]0 - 1.0V
[Ignition switch: ON]
• More than 1 second after turning ignition
switch ONBATTERY VOLTAGE
(11 - 14V)
25
29
30
31V
Y
O
LFuel injector No. 4
Fuel injector No. 3
Fuel injector No. 2
Fuel injector No. 1[Engine is running]
•Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes depending on rpm
at idle.BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
•Warm-up condition
• Engine speed: 2,000 rpmBATTERY VOLTAGE
(11 - 14V)
28 WEVAP canister vent control
valve[Ignition switch: ON]BATTERY VOLTAGE
(11 - 14V)
32 PECM relay
(Self shut-off)[Engine is running]
[Ignition switch: OFF]
• For a few seconds after turning ignition
switch OFF0 - 1.0V
[Ignition switch: OFF]
• More than a few seconds after turning igni-
tion switch OFFBATTERY VOLTAGE
(11 - 14V) TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
PBIA9265J
PBIA9266J
PBIB0529E
PBIA4943J

TROUBLE DIAGNOSIS
EC-111
< SERVICE INFORMATION >
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X: Applicable
*1: This item includes 1st trip DTCs.
*2: This mode includes 1st trip freeze frame data or freeze frame data. The items appear on CONSULT-II screen in freeze frame data
mode only if a 1st trip DTC or DTC is detected. For details, refer to EC-47, "
Emission-related Diagnostic Information".
*3: Always “COMPLT” is displayed.
INSPECTION PROCEDURE
Refer to LAN-8, "Description".
WORK SUPPORT MODE
Work Item
ENGINE CONTROL COMPONENT PARTS
OUTPUT
Fuel injector×× ×
Power transistor (Ignition timing)×× ×
Throttle control motor relay×××
Throttle control motor×
EVAP canister purge volume con-
trol solenoid valve×××××
Air conditioner relay××
Fuel pump relay××××
Cooling fan relay××××
Air fuel ratio (A/F) sensor 1 heater×××
×*
3
Heated oxygen sensor 2 heater×××
×*3
EVAP canister vent control valve×× ×××
Intake valve timing control solenoid
valve××××
Calculated load value××× ItemDIAGNOSTIC TEST MODE
WORK
SUP-
PORTSELF-DIAGNOSTIC
RESULTS
DATA
MONI-
TORDATA
MONI-
TOR
(SPEC)ACTIVE
TESTDTC & SRT
CONFIRMATION
DTC*
1 FREEZE
FRAME
DATA*
2
SRT
STATUSDTC
WORK
SUP-
PORT
WORK ITEM CONDITION USAGE
FUEL PRESSURE RELEASE • FUEL PUMP WILL STOP BY TOUCHING “START” DUR-
ING IDLING.
CRANK A FEW TIMES AFTER ENGINE STALLS.When releasing fuel pressure from
fuel line
IDLE AIR VOL LEARN • THE IDLE AIR VOLUME THAT KEEPS THE ENGINE
WITHIN THE SPECIFIED RANGE IS MEMORIZED IN
ECM.When learning the idle air volume
SELF-LEARNING CONT • THE COEFFICIENT OF SELF-LEARNING CONTROL
MIXTURE RATIO RETURNS TO THE ORIGINAL COEF-
FICIENT.When clearing the coefficient of
self-learning control value

TROUBLE DIAGNOSIS
EC-115
< SERVICE INFORMATION >
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P OINT/V SOL (B1) [%]• The control value of the intake valve timing
control solenoid valve (determined by ECM ac-
cording to the input signal) is indicated.
• The advance angle becomes larger as the val-
ue increases
AIR COND RLY
[ON/OFF]ו The air conditioner relay control condition (de-
termined by ECM according to the input sig-
nals) is indicated.
FUEL PUMP RLY
[ON/OFF]ו Indicates the fuel pump relay control condition
determined by ECM according to the input sig-
nals.
VENT CONT/V [ON/
OFF]• The control condition of the EVAP canister vent
control valve (determined by ECM according to
the input signals) is indicated.
ON: Closed
OFF: Open
THRTL RELAY
[ON/OFF]ו Indicates the throttle control motor relay control
condition determined by the ECM according to
the input signals.
COOLING FAN
[HI/LOW/OFF]ו Indicates the condition of the cooling fan (de-
termined by ECM according to the input sig-
nals).
HI: High speed operation
LOW: Low speed operation
OFF: Stop
HO2S2 HTR (B1)
[ON/OFF]• Indicates [ON/OFF] condition of heated oxygen
sensor 2 heater determined by ECM according
to the input signals.
I/P PULLY SPD
[rpm]• Indicates the engine speed computed from the
turbine revolution sensor signal.
VEHICLE SPEED
[km/h] or [MPH]ו The vehicle speed computed from the vehicle
speed signal sent from TCM is displayed.
IDL A/V LEARN
[YET/CMPLT]• Display the condition of idle air volume learning
YET: Idle Air Volume Learning has not been
performed yet.
CMPLT: Idle Air Volume Learning has already
been performed successfully.
TRVL AFTER MIL
[km] or [mile]• Distance traveled while MIL is activated.
A/F S1 HTR (B1) [%]• Indicates A/F sensor 1 heater control value
computed by ECM according to the input sig-
nals.
• The current flow to the heater becomes larger
as the value increases.
AC PRESS SEN [V]ו The signal voltage from the refrigerant pres-
sure sensor is displayed.
VHCL SPEED SE
[km/h] or [MPH]• The vehicle speed computed from the vehicle
speed signal sent from TCM is displayed.
SET VHCL SPD
[km/h] or [MPH]• The preset vehicle speed is displayed.
MAIN SW
[ON/OFF]• Indicates [ON/OFF] condition from MAIN
switch signal.
CANCEL SW
[ON/OFF]• Indicates [ON/OFF] condition from CANCEL
switch signal. Monitored item [Unit]ECM IN-
PUT SIG-
NALSMAIN
SIG-
NALSDescription Remarks

TROUBLE DIAGNOSIS
EC-117
< SERVICE INFORMATION >
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NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.
ACTIVE TEST MODE
Test Item
Monitored item [Unit]ECM
input
signalsMain
signalsDescription Remarks
ENG SPEED [rpm]×ו Indicates the engine speed computed
from the signal of the crankshaft position
sensor (POS) and camshaft position
sensor (PHASE).
MAS A/F SE-B1 [V]×ו The signal voltage of the mass air flow
sensor specification is displayed.• When engine is running specification
range is indicated.
B/FUEL SCHDL
[msec]ו “Base fuel schedule” indicates the fuel in-
jection pulse width programmed into
ECM, prior to any learned on board cor-
rection.• When engine is running specification
range is indicated.
A/F ALPHA-B1 [%]ו The mean value of the air-fuel ratio feed-
back correction factor per cycle is indi-
cated.• When engine is running specification
range is indicated.
• This data also includes the data for the
air-fuel ratio learning control.
TEST ITEM CONDITION JUDGEMENT CHECK ITEM (REMEDY)
FUEL INJEC-
TION• Engine: Return to the original
trouble condition
• Change the amount of fuel injec-
tion using CONSULT-II.If trouble symptom disappears, see
CHECK ITEM.• Harness and connectors
• Fuel injector
• Air fuel ratio (A/F) sensor 1
IGNITION TIM-
ING• Engine: Return to the original
trouble condition
• Timing light: Set
• Retard the ignition timing using
CONSULT-II.If trouble symptom disappears, see
CHECK ITEM.• Perform Idle Air Volume Learning.
POWER BAL-
ANCE• Engine: After warming up, idle the
engine.
• A/C switch OFF
• Shift lever: P or N (A/T, CVT),
Neutral (M/T)
• Cut off each fuel injector signal
one at a time using CONSULT-II.Engine runs rough or dies.• Harness and connectors
• Compression
• Fuel injector
• Power transistor
•Spark plug
• Ignition coil
COOLING FAN*• Ignition switch: ON
• Turn the cooling fan “LOW”, “HI”
and “OFF” with CONSULT-II.Cooling fan moves and stops.• Harness and connectors
• Cooling fan relay
• Cooling fan motor
ENG COOLANT
TEMP• Engine: Return to the original
trouble condition
• Change the engine coolant tem-
perature using CONSULT-II.If trouble symptom disappears, see
CHECK ITEM.• Harness and connectors
• Engine coolant temperature sen-
sor
• Fuel injector
FUEL PUMP RE-
LAY• Ignition switch: ON
(Engine stopped)
• Turn the fuel pump relay ON and
OFF using CONSULT-II and lis-
ten to operating sound.Fuel pump relay makes the operat-
ing sound.• Harness and connectors
• Fuel pump relay
PURG VOL
CONT/V• Engine: After warming up, run en-
gine at 1,500 rpm.
• Change the EVAP canister purge
volume control solenoid valve
opening percent using CON-
SULT-II.Engine speed changes according to
the opening percent.• Harness and connectors
• EVAP canister purge volume con-
trol solenoid valve