EC Engine Control System NISSAN TIIDA 2007 Service Repair Manual

COOLING FAN CONTROL
EC-737
< FUNCTION DIAGNOSIS >[MR18DE]
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COOLING FAN CONTROL
System DiagramINFOID:0000000001161740
System DescriptionINFOID:0000000001161741
INPUT/OUTPUT SIGNAL CHART
*1: The ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to ECM through CAN communication line.
SYSTEM DESCRIPTION
ECM controls cooling fan speed corresponding to vehicle speed, engine coolant temperature, refrigerant pres-
sure, air conditioner ON signal. Then control system has 3-step control [HIGH/LOW/OFF].
Cooling Fan Operation
JMBIA0177GB
Sensor Input signal to ECM ECM function Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)Engine speed*
1
Cooling fan
controlIPDM E/R
↓
Cooling fan relay
↓
Cooling fan motor Battery
Battery voltage*
1
Combination meter
Vehicle speed*2
Engine coolant temperature sensor Engine coolant temperature
BCM
Air conditioner ON signal*
2
Refrigerant pressure sensor Refrigerant pressure

EC-744
< FUNCTION DIAGNOSIS >[MR18DE]
COOLING FAN CONTROL
Component Description
INFOID:0000000001161743
1. ASCD steering switch 2. MAIN switch 3. CANCEL switch
4. SET/COAST switch 5. RESUME/ACCELEATE switch 6. Stop lamp switch
7. ASCD brake switch 8. ASCD clutch switch 9. Cluch pedal
ALBIA0273ZZ
Component Reference
Camshaft position sensor (PHASE)EC-866, "
Description"
Crankshaft position sensor (POS)EC-862, "Description"
Cooling fan motorEC-737, "System Diagram"
Engine coolant temperature sensorEC-807, "Description"
Refrigerant pressure sensorEC-988, "Description"

EC-746
< FUNCTION DIAGNOSIS >[MR18DE]
EVAPORATIVE EMISSION SYSTEM
NOTE:
Do not use soapy water or any type of solvent while installing vacuum hose or purge hoses.
System DescriptionINFOID:0000000001161745
INPUT/OUTPUT SIGNAL CHART
*1: ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to the ECM through CAN communication line.
SYSTEM DESCRIPTION
1. EVAP canister purge volume control
solenoid valve2. EVAP purge resonator 3. EVAP canister

1. EVAP canister 3.

ALBIA0274ZZ
Sensor Input signal to ECM ECM function Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)Engine speed*
1
EVAP canister
purge flow controlEVAP canister purge vol-
ume control solenoid valve Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Battery
Battery voltage*
1
Throttle position sensor Throttle position
Accelerator pedal position sensor Accelerator pedal position
Heated oxygen sensor 1Density of oxygen in exhaust gas
(Mixture ratio feedback signal)
Fuel tank temperature sensor Fuel temperature in fuel tank
Combination meter*
2Vehicle speed

EVAPORATIVE EMISSION SYSTEM
EC-747
< FUNCTION DIAGNOSIS >[MR18DE]
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The evaporative emission system is used to reduce hydrocarbons emitted into the atmosphere from the fuel
system. This reduction of hydrocarbons is accomplished by activated charcoals in the EVAP canister.
The fuel vapor in the sealed fuel tank is led into the EVAP canister which contains activated carbon and the
vapor is stored there when the engine is not operating or when refueling to the fuel tank.
The vapor in the EVAP canister is purged by the air through the purge line to the intake manifold when the
engine is operating. EVAP canister purge volume control solenoid valve is controlled by ECM. When the
engine operates, the flow rate of vapor controlled by EVAP canister purge volume control solenoid valve is
proportionally regulated as the air flow increases.
EVAP canister purge volume control solenoid valve also shuts off the vapor purge line during decelerating.
Component Parts LocationINFOID:0000000001603915
1. Ignition coil (with power transistor)
and spark plug2. Intake valve timing control solenoid
valve3. Refrigerant pressure sensor
4. Knock sensor 5. Fuel injector 6. Cooling fan motor
7. Camshaft position sensor (PHASE) 8. IPDM E/R 9. ECM
PBIB3261E

EC-748
< FUNCTION DIAGNOSIS >[MR18DE]
EVAPORATIVE EMISSION SYSTEM
10. Mass air flow sensor (with intake
temperature sensor)11. Engine coolant temperature sensor 12. Electric throttle control actuator
(with built in throttle position sensor
and throttle control motor)
13. EVAP canister purge volume control
solenoid valve
1. Mass air flow sensor
(with intake air temperature sensor)2. Engine coolant temperature sensor 3. Electric throttle control actuator
(with built in throttle position sensor,
throttle control motor)
4. PCV valve 5. Cooling fan motor 6. Resistor
7. Refrigerant pressure sensor
BBIA0724E

EC-752
< FUNCTION DIAGNOSIS >[MR18DE]
EVAPORATIVE EMISSION SYSTEM
Component Description
INFOID:0000000001161747
1. ASCD steering switch 2. MAIN switch 3. CANCEL switch
4. SET/COAST switch 5. RESUME/ACCELEATE switch 6. Stop lamp switch
7. ASCD brake switch 8. ASCD clutch switch 9. Cluch pedal
ALBIA0273ZZ
Component Reference
Accelerator pedal position sensorEC-959, "
Description"
Camshaft position sensor (PHASE)EC-866, "Description"
Crankshaft position sensor (POS)EC-862, "Description"
Engine coolant temperature sensorEC-807, "Description"
EVAP canister purge volume control solenoid valveEC-875, "Description"
Heated oxygen sensor 1EC-813, "Description"
Mass air flow sensorEC-799, "Description"
Throttle position sensorEC-810, "Description"
Vehicle speed sensorEC-878, "Description"

INTAKE VALVE TIMING CONTROL
EC-753
< FUNCTION DIAGNOSIS >[MR18DE]
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INTAKE VALVE TIMING CONTROL
System DiagramINFOID:0000000001161748
System DescriptionINFOID:0000000001161749
INPUT/OUTPUT SIGNAL CHART
*: This signal is sent to the ECM through CAN communication line
SYSTEM DESCRIPTION
This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the intake
valve.
The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant
temperature. Then, the ECM sends ON/OFF pulse duty signals to the intake valve timing (IVT) control sole-
noid valve depending on driving status. This makes it possible to control the shut/open timing of the intake
valve to increase engine torque in low/mid speed range and output in high-speed range.
PBIB3333E
Sensor Input signal to ECM ECM function Actuator
Crankshaft position sensor (POS)
Engine speed and piston position
Intake valve
timing controlIntake valve timing control
solenoid valve Camshaft position sensor (PHASE)
Engine coolant temperature sensor Engine coolant temperature
Combination meter* Vehicle speed

INTAKE VALVE TIMING CONTROL
EC-759
< FUNCTION DIAGNOSIS >[MR18DE]
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Component DescriptionINFOID:0000000001161751
1. ASCD steering switch 2. MAIN switch 3. CANCEL switch
4. SET/COAST switch 5. RESUME/ACCELEATE switch 6. Stop lamp switch
7. ASCD brake switch 8. ASCD clutch switch 9. Cluch pedal
ALBIA0273ZZ
Component Reference
Camshaft position sensor (PHASE)EC-866, "
Description"
Crankshaft position sensor (POS)EC-862, "Description"
Engine coolant temperature sensorEC-807, "Description"
Intake valve timing control solenoid valveEC-753, "System Diagram"
Vehicle speed sensorEC-878, "Description"

EC-762
< FUNCTION DIAGNOSIS >[MR18DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
(CONSULT-III also displays the malfunctioning component or system.)
No Tools
The number of blinks of the MI in the Diagnostic Test Mode II (Self-Diagnostic Results) indicates the DTC.
Example: 0340, 1148, 1706, etc.
These DTCs are controlled by NISSAN.
1st trip DTC No. is the same as DTC No.
Output of a DTC indicates a malfunction. However, GST or the Diagnostic Test Mode II do not indi-
cate whether the malfunction is still occurring or has occurred in the past and has returned to nor-
mal. CONSULT-III can identify malfunction status as shown below. Therefore, using CONSULT-III (if
available) is recommended.
DTC or 1st trip DTC of a malfunction is displayed in “SELF-DIAGNOSTIC RESULTS” mode of CONSULT-III.
Time data indicates how many times the vehicle was driven after the last detection of a DTC.
If the DTC is being detected currently, the time data will be [0].
If a 1st trip DTC is stored in the ECM, the time data will be [1t].
How to Erase DTC and 1st Trip DTC
With CONSULT-III
The emission related diagnostic information in the ECM can be erased by selecting “All Erase” in the “Descrip-
tion” of “FINAL CHECK” mode with CONSULT-III.
With GST
The emission related diagnostic information in the ECM can be erased by selecting Service $04 with GST.
1. If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once. Wait at least 10
seconds and then turn it ON (engine stopped) again.
2. Select Service $04 with GST (Generic Scan Tool).
No Tools
1. If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once.
Wait at least 10 seconds and then turn it ON (engine stopped) again.
2. Change the diagnostic test mode from Mode II to Mode I by depressing the accelerator pedal.
If the battery is disconnected, the emission-related diagnostic information will be lost within 24
hours.
The following data are 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
Actual work procedures are explained using a DTC as an example. Be careful so that not only the DTC, but all
of the data listed above, are cleared from the ECM memory during work procedures.
SYSTEM READINESS TEST (SRT) CODE
System Readiness Test (SRT) code is specified in Service $01 of ISO 15031-5.
As part of an enhanced emissions test for Inspection & Maintenance (I/M), certain states require the status of
SRT be used to indicate whether the ECM has completed self-diagnosis of major emission systems and com-
ponents. Completion must be verified in order for the emissions inspection to proceed.
If a vehicle is rejected for a State emissions inspection due to one or more SRT items indicating “INCMP”, use
the information in this Service Manual to set the SRT to “CMPLT”.
In most cases the ECM will automatically complete its self-diagnosis cycle during normal usage, and the SRT
status will indicate “CMPLT” for each application system. Once set as “CMPLT”, the SRT status remains
“CMPLT” until the self-diagnosis memory is erased.
Occasionally, certain portions of the self-diagnostic test may not be completed as a result of the customer's
normal driving pattern; the SRT will indicate “INCMP” for these items.
NOTE:
The SRT will also indicate “INCMP” if the self-diagnosis memory is erased for any reason or if the ECM mem-
ory power supply is interrupted for several hours.
If, during the state emissions inspection, the SRT indicates “CMPLT” for all test items, the inspector will con-
tinue with the emissions test. However, if the SRT indicates “INCMP” for one or more of the SRT items the
vehicle is returned to the customer untested.
NOTE:

ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-773
< FUNCTION DIAGNOSIS >[MR18DE]
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 System readiness test (SRT) codes
Test values
ENGINE CONTROL COMPONENT PARTS/CONTROL SYSTEMS APPLICATION
ItemDIAGNOSTIC TEST MODE
WORK
SUPPORTSELF-DIAGNOSTIC
RESULTS
DATA
MONI-
TORACTIVE
TESTDTC & SRT
CONFIRMATION
DTC*
1FREEZE
FRAME
DATA*
2
SRT STA-
TUSDTC
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××××
Wheel sensor×××
Accelerator pedal position sensor××
Throttle position sensor××
Intake air temperature sensor×××
Knock sensor×
EPS control unit×
Refrigerant pressure sensor×
Closed throttle position switch (accel-
erator pedal position sensor signal)×
Air conditioner switch×
Park/neutral position (PNP) switch××
Stop lamp switch××
Battery voltage×
Load signal×
ASCD steering switch××
ASCD break switch××
ASCD cluch switch××
ENGINE CONTROL COMPONENT PARTS
OUTPUT
Fuel injector××
Power transistor (Ignition timing)××
Throttle control motor relay××
Throttle control motor×
EVAP canister purge volume control
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××