2003 NISSAN ALMERA N16 Cooling fan relay

ENGINE CONTROL SYSTEM
EC-23
[QG (WITH EURO-OBD)]
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EC
System ChartEBS00K34
*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) SystemEBS00K35
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: 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 relay*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 & mixture
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-88
[QG (WITH EURO-OBD)]
TROUBLE DIAGNOSIS
ENGINE CONTROL COMPONENT PARTS/CONTROL SYSTEMS APPLICATION
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-40, "
FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME
DATA" .ItemDIAGNOSTIC TEST MODE
WORK
SUP-
PORTSELF-DIAGNOSTIC
RESULTS
DATA
MONI-
TORDATA
MONI-
TOR
(SPEC)ACTIVE
TESTDTC & SRT
CONFIRMATION
DTC
*1FREEZE
FRAME
DATA
*2
SRT
STATUSDTC
WORK
SUP-
PORT
ENGINE CONTROL COMPONENT PARTS
INPUT
Crankshaft position sensor (POS)××××
Camshaft position sensor (PHASE)××××
Mass air flow sensor×××
Engine coolant temperature sensor×××××
Heated oxygen sensor 1×××××
Heated oxygen sensor 2×××××
Vehicle speed signal××××
Accelerator pedal position sensor×××
Throttle position sensor×××
Intake air temperature sensor××××
Knock sensor×
Refrigerant pressure sensor××
Closed throttle position switch
(accelerator pedal position sensor
signal)××
Air conditioner switch××
Park/neutral position (PNP) switch×××
Stop lamp switch×××
Power steering pressure sensor×××
Battery voltage××
Electrical load signal××
OUTPUT
Injectors×× ×
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××××
Heated oxygen sensor 1 heater××××
Heated oxygen sensor 2 heater××××
Intake valve timing control solenoid
valve××××
Calculated load value×××

TROUBLE DIAGNOSIS
EC-93
[QG (WITH EURO-OBD)]
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EC
PURG VOL C/V
[%]
●Indicates the EVAP canister purge vol-
ume control solenoid valve control value
computed by the ECM according to the
input signals.
●The opening becomes larger as the
value increases.
INT/V TIM (B1)
[°CA]
●Indicates [°CA] of intake camshaft
advanced angle.
INT/V SOL (B1) [%]
●The control condition of the intake valve
timing control solenoid valve (deter-
mined by ECM according to the input
signals) is indicated.
ON ... intake valve timing control is oper-
ating.
OFF ... Intake valve timing control is not
operating.
AIR COND RLY
[ON/OFF]×
●The air conditioner relay control condi-
tion (determined by ECM according to
the input signals) is indicated.
FUEL PUMP RLY
[ON/OFF]×
●Indicates the fuel pump relay control
condition determined by ECM according
to the input signals.
THRTL RELAY
[ON/OFF]×
●Indicates the throttle control motor relay
control condition determined by the
ECM according to the input signals.
COOLING FAN
[ON/OFF]
●Indicates the condition of the cooling fan
(determined by ECM according to the
input signals).
ON ... Operation
OFF ... Stop
HO2S1 HTR (B1)
[ON/OFF]
●Indicates [ON/OFF] condition of heated
oxygen sensor 1 heater determined by
ECM according to the input signals.
HO2S2 HTR (B1)
[ON/OFF]
●Indicates [ON/OFF] condition of heated
oxygen sensor 2 heater determined by
ECM according to the input signals.
VEHICLE SPEED
[km/h] or [mph]×
●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 MI is activated.
O2SEN HTR DTY
[%]
●Indicates the heated oxygen sensor 1
heater control value computed by the
ECM according to the input signals.
AC PRESS SEN
[V]×
●The signal voltage from the refrigerant
pressure sensor is displayed. Monitored item
[Unit]ECM
INPUT
SIG-
NALSMAIN
SIG-
NALSCAN
DIAG
SUP-
PORT
MNTRDescription Remarks

TROUBLE DIAGNOSIS
EC-95
[QG (WITH EURO-OBD)]
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EC
ACTIVE TEST MODE
Test Item
*: Leaving cooling fan ″OFF″ with CONSULT-II while engine is running may cause the engine to overheat.
DTC & SRT CONFIRMATION MODE
SRT STATUS Mode
For details, refer to EC-40, "SYSTEM READINESS TEST (SRT) CODE" .
SRT Work Support Mode
This mode enables a technician to drive a vehicle to set the SRT while monitoring the SRT status.
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 injectors
●Heated oxygen 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 Learn-
ing”.
POWER BAL-
ANCE
●Engine: After warming up, idle
the engine.
●A/C switch “OFF”
●Shift lever:
N (A/T models)
Neutral (M/T models)
●Cut off each injector signal one at
a time using CONSULT-II.Engine runs rough or dies.
●Harness and connectors
●Compression
●Fuel injectors
●Power transistor
●Spark plugs
●Ignition coils
COOLING FAN*
●Ignition switch: ON
●Turn the cooling fan “ON” 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 injectors
FUEL PUMP
RELAY
●Ignition switch: ON (Engine
stopped)
●Turn the fuel pump relay “ON”
and “OFF” using CONSULT-II
and listen 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
engine 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
●Solenoid valve
V/T ASSIGN
ANGLE
●Engine: Return to the original
trouble condition
●Change intake valve timing using
CONSULT-II.If trouble symptom disappears, see
CHECK ITEM.
●Harness and connectors
●Intake valve timing control sole-
noid valve

TROUBLE DIAGNOSIS
EC-101
[QG (WITH EURO-OBD)]
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ECMASS AIRFLOW
●Engine: After warming up
●Shift lever:
N (A/T models)
Neutral (M/T models)
●Air conditioner switch: OFF
●No-loadIdle 1.0 - 4.0 g·m/s
2,500 rpm 5.0 - 10.0 g·m/s
PURG VOL C/V
●Engine: After warming up
●Shift lever:
N (A/T models)
Neutral (M/T models)
●Air conditioner switch: OFF
●No-loadIdle 0%
2,000 rpm 15 - 30%
INT/V TIM (B1)
●Engine: After warming up
●Shift lever:
N (A/T models)
Neutral (M/T models)
●Air conditioner switch: OFF
●No-loadIdle−5° - 5°CA
When revving engine up to 2,000 rpm
quicklyApprox. 0° - 30°CA
INT/V SOL (B1)
●Engine: After warming up
●Shift lever:
N (A/T models)
Neutral (M/T models)
●Air conditioner switch: OFF
●No-loadIdle 0% - 2%
When revving engine up to 2,000 rpm
quicklyApprox. 0% - 60%
AIR COND RLY
●Engine: After warming up, idle
the engineAir conditioner switch: OFF OFF
Air conditioner switch: ON
(Compressor operates)ON
FUEL PUMP RLY
●For 1 seconds after turning ignition switch ON
●Engine running or crankingON
●Except above conditions OFF
THRTL RELAY
●Ignition switch: ON ON
COOLING FAN
●Engine: After warming up, idle
the engine
●Air conditioner switch: OFFEngine coolant temperature is 99°C
(210°F) or lessOFF
Engine coolant temperature is 100°C
(212°F) or moreON
HO2S1 HTR (B1)
●Engine: After warming up
●Engine speed: Below 3,600 rpm (M/T models)
Below 3,200 rpm (A/T models)ON
●Engine speed: Above 3,600 rpm (M/T models)
Above 3,200 rpm (A/T models)OFF
HO2S2 HTR (B1)
●Engine speed: Below 3,800 rpm after the following conditions are met.
●Engine: After warming up
●Keeping the engine speed between 3,500 and 4,000 rpm for one minute
and at idle for one minute under no loadON
●Engine speed: Above 3,800 rpm OFF
TRVL AFTER MIL
●Ignition switch: ONVehicle has traveled after MI has
turned ON.0 - 65,280 km
(0 - 40,565 mile)
O2SEN HTR DTY
●Engine coolant temperature when engine started: More than 80° (176°F)
●Engine speed: Below 3,600 rpm (M/T models)
Below 3,200 rpm (A/T models)Approx. 50% MONITOR ITEM CONDITION SPECIFICATION

EC-324
[QG (WITH EURO-OBD)]
DTC P1217 ENGINE OVER TEMPERATURE
DTC P1217 ENGINE OVER TEMPERATURE
PFP:00000
System DescriptionEBS00KBC
NOTE:
If DTC P1217 is displayed with DTC U1000, U1001, first perform the trouble diagnosis for DTC U1000,
U1001. Refer to EC-116, "
DTC U1000, U1001 CAN COMMUNICATION LINE" .
COOLING FAN CONTROL
*1: The ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: These signals are sent to the ECM through CAN communication line.
The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, refrigerant
pressure, and air conditioner ON signal. The control system has 2-step control [ON/OFF].
The ECM sends a cooling fan control signal to the smart entrance control unit through CAN communication
line, and the smart entrance control unit controls cooling fan relays.
OPERATION
CONSULT-II Reference Value in Data Monitor ModeEBS00KBD
Specification data are reference values.
Sensor Input Signal to ECM ECM Function Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)Engine speed
*1
Cooling fan
controlCooling fan relay(s) Battery
Battery voltage
*1
Vehicle speed signal
Vehicle speed*2
Engine coolant temperature sensor Engine coolant temperature
Air conditioner switch
Air conditioner “ON” signal
*2
Refrigerant pressure sensor Refrigerant pressure
MBIB0036E
MONITOR ITEM CONDITION SPECIFICATION
AIR COND SIG
●Engine: After warming up, idle
the engineAir conditioner switch: OFF OFF
Air conditioner switch: ON
(Compressor operates.)ON
COOLING FAN
●Engine: After warming up, idle
the engine
●Air conditioner switch: OFFEngine coolant temperature is 99°C
(210°F) or lessOFF
Engine coolant temperature is 100°C
(212°F) or moreON

DTC P1217 ENGINE OVER TEMPERATURE
EC-331
[QG (WITH EURO-OBD)]
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EC
PROCEDURE A
1.CHECK COOLING FAN POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect cooling fan relay-1.
3. Turn ignition switch “ON”.
4. Check voltage between cooling fan relay-1 terminals 1, 3, 6 and
ground with CONSULT-II or tester.
OK or NG
OK >> GO TO 3.
NG >> GO TO 2.
2.DETECT MALFUNCTIONING PART
Check the following.
●Fuse block (J/B) connector E106
●10A fuse
●30A fusible links
●Harness for open or short between cooling fan relay-1 and fuse
●Harness for open or short between cooling fan relay-1 and battery
>> Repair open circuit or short to ground or short to power in harness or connectors.
MBIB0247E
Voltage: Battery voltage
PBIB0951E

EC-332
[QG (WITH EURO-OBD)]
DTC P1217 ENGINE OVER TEMPERATURE
3. CHECK COOLING FAN MOTORS CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect cooling fan motor-1 harness connector and cooling
fan motor-2 harness connector.
3. Check harness continuity between cooling fan relay-1 terminal 5
and cooling fan motor-1 terminal 1, cooling fan motor-1 terminal
2 and body ground.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
5. Check harness continuity between cooling fan relay-1 terminal 7
and cooling fan motor-2 terminal 1, cooling fan motor-2 terminal
2 and body ground.
Refer to Wiring Diagram.
6. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 4.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
4. CHECK COOLING FAN OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect smart entrance control unit.
2. Check harness continuity between smart entrance control unit
terminal 33 and cooling fan relay-1 terminal 2.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 6.
NG >> GO TO 5.
5. DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors E251, M182 (LHD models)
●Harness connectors E174, M159 (RHD models)
●Harness for open or short between smart entrance control unit and cooling fan relay-1
>> Repair open circuit or short to ground or short to power in harness or connectors.
6. CHECK COOLING FAN RELAY-1
Refer to EC-334, "
Component Inspection" .
OK or NG
OK >> GO TO 7.
NG >> Replace cooling fan relay.Continuity should exist.
Continuity should exist.
MBIB0252E
Continuity should exist.
MBIB0264E