2003 NISSAN ALMERA N16 relay

FUEL PUMP CIRCUIT
EC-385
[QG (WITH EURO-OBD)]
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7.DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors M202, F115
●Harness connectors B38, M81
●Harness for open or short between ECM and fuel pump relay
>> Repair open circuit or short to ground or short to power in harness or connectors.
8.CHECK FUEL PUMP RELAY
Refer to EC-385, "
Component Inspection" .
OK or NG
OK >> GO TO 9.
NG >> Replace fuel pump relay.
9.CHECK FUEL PUMP
Refer to EC-385, "
Component Inspection" .
OK or NG
OK >> GO TO 10.
NG >> Replace fuel pump.
10.CHECK INTERMITTENT INCIDENT
Refer to EC-109, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionEBS00KD7
FUEL PUMP RELAY
Check continuity between terminals 3 and 4, 3 and 5 under the fol-
lowing conditions.
FUEL PUMP
1. Disconnect fuel level sensor unit and fuel pump harness connector.
2. Check resistance between fuel level sensor unit and fuel pump
terminals 3 and 5.
Conditions Terminals Continuity
12V direct current supply
between terminals 1 and 23 and 4 No
3 and 5 Yes
No current supply3 and 4 Yes
3 and 5 No
PBIB0098E
Resistance: Approximately 1.0Ω [at 25°C (77°F)]
PBIB0658E

ELECTRICAL LOAD SIGNAL
EC-395
[QG (WITH EURO-OBD)]
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3.CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-II
Without CONSULT-II
Check voltage between ECM terminal 84 and ground under the fol-
lowing conditions.
OK or NG
OK >>INSPECTION END
NG >> GO TO 5.
4.CHECK REAR WINDOW DEFOGGER SYSTEM
Refer to EL-173.
>>INSPECTION END
5.CHECK HEADLAMP FUNCTION
1. Turn lighting switch “ON” at 2nd position.
2. Check that headlamps are illuminated.
OK or NG
OK >> GO TO 6.
NG >> Refer to EL-42 or EL-46 .
6.CHECK HEADLAMP INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
WITHOUT DAYTIME LIGHT SYSTEM
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Disconnect lighting switch harness connector.
4. Check harness continuity between ECM terminal 84 and lighting switch terminal 10.
Refer to Wiring Diagram.
5. Also check harness for short to ground and short to power.
WITH DAYTIME LIGHT SYSTEM
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Disconnect daytime light relay.
4. Check harness continuity between ECM terminal 84 and daytime light relay terminal 3.
Refer to Wiring Diagram.
5. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 8.
NG >> GO TO 7.
Condition Voltage
Lighting switch “ON” at 2nd position Battery voltage
Lighting switch “OFF” Approximately 0V
MBIB0158E
Continuity should exist.
Continuity should exist.

EC-396
[QG (WITH EURO-OBD)]
ELECTRICAL LOAD SIGNAL
7. DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors E75, F36
●harness for open and short between ECM and lighting switch
●harness for open and short between ECM and daytime light relay
>> Repair open circuit or short to ground or short to power in harness or connectors.
8. CHECK INTERMITTENT INCIDENT
Refer to EC-109, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END

ENGINE CONTROL SYSTEM
EC-417
[QG (WITHOUT EURO-OBD)]
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System ChartEBS00KEB
*1: This sensor is not used to control the engine system under normal conditions.
*2: The signals are sent to the ECM through CAN communication line.
*3: The output signals are sent from the ECM through CAN communication line.
Multiport Fuel Injection (MFI) SystemEBS00KEC
INPUT/OUTPUT SIGNAL CHART
*1: Under normal conditions, this sensor is not for engine control operation.
*2: This signal is sent to the ECM through CAN communication line.
*3: The ECM determines the start signal status by the signals of engine speed and battery voltage.
SYSTEM DESCRIPTION
The amount of fuel injected from the fuel injector is determined by the ECM. The ECM controls the length of
time the valve remains open (injection pulse duration). The amount of fuel injected is a program value in the
Input (Sensor) ECM Function Output (Actuator)
●Camshaft position sensor (PHASE)
●Crankshaft position sensor (POS)
●Mass air flow sensor
●Engine coolant temperature sensor
●Heated oxygen sensor 1
●Throttle position sensor
●Accelerator pedal position sensor
●Park/neutral position (PNP) switch
●Intake air temperature sensor
●Power steering pressure sensor
●Ignition switch
●Stop lamp switch
●Battery voltage
●Knock sensor
●Refrigerant pressure sensor
●Heated oxygen sensor 2*1
●TCM (Transmission control module)*2
●Air conditioner switch*2
●Vehicle speed signal*2
●Electrical load signal*2
Fuel injection & mixture ratio control Fuel injectors
Electronic ignition system Power transistor
Fuel pump control Fuel pump relay
On board diagnostic system
MI (On the instrument panel)
*3
Intake valve timing controlIntake valve timing control solenoid
valve
Heated oxygen sensor 1 heater control Heated oxygen sensor 1 heater
Heated oxygen sensor 2 heater control Heated oxygen sensor 2 heater
EVAP canister purge flow controlEVAP canister purge volume control
solenoid valve
Air conditioning cut control
Air conditioner relay
*3
Cooling fan control
Cooling fan relays*3
Sensor Input Signal to ECM ECM function Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)Engine speed
*3 and piston position
Fuel injection & mix-
ture ratio controlFuel injectors Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Heated oxygen sensor 1 Density of oxygen in exhaust gas
Throttle position sensor Throttle position
Accelerator pedal position sensor Accelerator pedal position
Park/neutral position (PNP) switch Gear position
Knock sensor Engine knocking condition
Battery
Battery voltage
*3
Power steering pressure sensor Power steering operation
Heated oxygen sensor 2
*1Density of oxygen in exhaust gas
Vehicle speed signal
*2Vehicle speed
Air conditioner switch
*2Air conditioner operation

EC-420
[QG (WITHOUT EURO-OBD)]
ENGINE CONTROL SYSTEM
SYSTEM DESCRIPTION
The ignition timing is controlled by the ECM to maintain the best air-
fuel ratio for every running condition of the engine. The ignition tim-
ing data is stored in the ECM. This data forms the map shown.
The ECM receives information such as the injection pulse width and
camshaft position sensor signal. Computing this information, ignition
signals are transmitted to the power transistor.
e.g., N: 1,800 rpm, Tp: 1.50 msec
A°BTDC
During the following conditions, the ignition timing is revised by the
ECM according to the other data stored in the ECM.
●At starting
●During warm-up
●At idle
●At low battery voltage
●During acceleration
The knock sensor retard system is designed only for emergencies. The basic ignition timing is programmed
within the anti-knocking zone, if recommended fuel is used under dry conditions. The retard system does not
operate under normal driving conditions. If engine knocking occurs, the knock sensor monitors the condition.
The signal is transmitted to the ECM. The ECM retards the ignition timing to eliminate the knocking condition.
Air Conditioning Cut ControlEBS00KEE
INPUT/OUTPUT SIGNAL CHART
*1: These signals are sent to the ECM through CAN communication line.
*2: The ECM determines the start signal status by the signals of engine speed and battery voltage.
SYSTEM DESCRIPTION
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.
SEF742M
Sensor Input Signal to ECM ECM function Actuator
Air conditioner switch
*1Air conditioner “ON” signal
Air conditioner
cut controlAir conditioner relay Throttle position sensor Throttle valve opening angle
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
Power steering pressure sensor Power steering operation
Vehicle speed signal
*1Vehicle speed

EC-442
[QG (WITHOUT EURO-OBD)]
TROUBLE DIAGNOSIS
●When there is an open circuit on MI circuit, the ECM cannot warn the driver by lighting MI 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 MI circuit is open by
means of operating fail-safe function.
The fail-safe function also operates when above diagnoses except MI circuit and demands the driver to
repair the malfunction.
P1122 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.
P1124
P1126Throttle 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 motorECM 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. 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-464
[QG (WITHOUT EURO-OBD)]
TROUBLE DIAGNOSIS
82 BSensor ground
(Accelerator pedal position
sensor 1)[Engine is running]●Warm-up condition
●Idle speedApproximately 0V
83 BSensor ground
(Accelerator pedal position
sensor 2)[Engine is running]
●Warm-up condition
●Idle speedApproximately 0V
84 R/YElectrical load signal
(Headlamp signal)[Ignition switch “ON”]
●Lighting switch is ″2nd″ position.BATTERY VOLTAGE
(11 - 14V)
[Ignition switch “ON”]
●Lighting switch is ″OFF″.Approximately 0V
85 LG DATA link connector[Ignition switch “ON”]
●CONSULT-II or GST is disconnected.BATTERY VOLTAGE
(11 - 14V)
86 R CAN communication line[Ignition switch “ON”]Approximately 2.3V
90 RSensor power supply
(Accelerator pedal position
sensor 1)[Ignition switch “ON”]Approximately 5V
91 GSensor power supply
(Accelerator pedal position
sensor 2)[Ignition switch “ON”]Approximately 5V
94 L CAN communication line[Ignition switch “ON”]Approximately 2.8V
98 LGAccelerator pedal position
sensor 2[Ignition switch “ON”]
●Engine stopped.
●Accelerator pedal fully released.0.175 - 0.335V
[Ignition switch “ON”]
●Engine stopped.
●Accelerator pedal fully depressed.More than 1.95V
101 R/G Stop lamp switch[Ignition switch “ON”]
●Brake pedal fully released.Approximately 0V
[Ignition switch “ON”]
●Brake pedal fully depressed.BATTERY VOLTAGE
(11 - 14V)
102P (A/T)
G/OR
(M/T)PNP switch[Ignition switch “ON”]
●Shift lever position is ″P″ or ″N″ (A/T mod-
els).
●Shift lever position is ″Neutral″ (M/T mod-
els).Approximately 0V
[Ignition switch “ON”]
●Except the above gear position.Approximately 5V
104 OR Throttle control motor relay[Ignition switch “OFF”]BATTERY VOLTAGE
(11 - 14V)
[Ignition switch “ON”]0 - 1.0V
106 LAccelerator pedal position
sensor 1[Ignition switch “ON”]
●Engine stopped.
●Accelerator pedal fully released.0.35 - 0.67V
[Ignition switch “ON”]
●Engine stopped.
●Accelerator pedal fully depressed.More than 3.9V TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)

TROUBLE DIAGNOSIS
EC-465
[QG (WITHOUT EURO-OBD)]
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: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
CONSULT-II FunctionEBS00KF0
FUNCTION
*1: 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
●Others109 B/R Ignition switch[Ignition switch “OFF”]0V
[Ignition switch “ON”]BATTERY VOLTAGE
(11 - 14V)
111 W/G ECM relay (Self shut-off)[Engine is running]
[Ignition switch “OFF”]
●For 5 seconds after turning ignition switch
“OFF”.0 - 1.0V
[Ignition switch “OFF”]
●5 seconds passed after turning ignition
switch “OFF”.BATTERY VOLTAGE
(11 - 14V)
113 B/P 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 “ON”.BATTERY VOLTAGE
(11 - 14V)
11 5
11 6B
BECM ground[Engine is running]
●Idle speedEngine ground
11 9
120W
WPower supply for ECM[Ignition switch “ON”]BATTERY VOLTAGE
(11 - 14V)
121 W/LPower supply for ECM
(Buck-up)[Ignition switch “OFF”]BATTERY VOLTAGE
(11 - 14V) TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
Diagnostic test mode Function
Work supportThis mode enables a technician to adjust some devices faster and more accurately by following the
indications on the CONSULT-II unit.
Self-diagnostic resultsSelf-diagnostic results such as 1st trip DTC, DTCs and 1st trip freeze frame data or freeze frame data
can be read and erased quickly.
*1
Data monitor Input/Output data in the ECM can be read.
Data monitor (SPEC)Input/Output of the specification for Basic fuel schedule, AFM, A/F feedback control value and the
other data monitor items can be read.
Active testDiagnostic Test Mode in which CONSULT-II drives some actuators apart from the ECMs and also
shifts some parameters in a specified range.
Function test This mode is used to inform customers when their vehicle condition requires periodic maintenance.
ECM part number ECM part number can be read.