2007 NISSAN 350Z engine coolant

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Revision: 2006 November2007 350Z Description ........................................................... 628
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... 628
On Board Diagnosis Logic ................................... 628
DTC Confirmation Procedure ............................... 628
Wiring Diagram .................................................... 629
Diagnostic Procedure ........................................... 630
Component Inspection ......................................... 632
DTC P2122, P2123 APP SENSOR ........................ 633
Component Description ........................................ 633
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... 633
On Board Diagnosis Logic ................................... 633
DTC Confirmation Procedure ............................... 634
Wiring Diagram .................................................... 635
Diagnostic Procedure ........................................... 637
Component Inspection ......................................... 640
Removal and Installation ...................................... 640
DTC P2127, P2128 APP SENSOR ........................ 641
Component Description ........................................ 641
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... 641
On Board Diagnosis Logic ................................... 641
DTC Confirmation Procedure ............................... 642
Wiring Diagram .................................................... 643
Diagnostic Procedure ........................................... 645
Component Inspection ......................................... 648
Removal and Installation ...................................... 649
DTC P2138 APP SENSOR ..................................... 650
Component Description ........................................ 650
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... 650
On Board Diagnosis Logic ................................... 650
DTC Confirmation Procedure ............................... 651
Wiring Diagram .................................................... 652
Diagnostic Procedure ........................................... 654
Component Inspection ......................................... 658
Removal and Installation ...................................... 658
DTC P2A00, P2A03 A/F SENSOR 1 ...................... 659
Component Description ........................................ 659
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... 659
On Board Diagnosis Logic ................................... 659
DTC Confirmation Procedure ............................... 660
Wiring Diagram .................................................... 661
Diagnostic Procedure ........................................... 665
Removal and Installation ...................................... 670
ASCD BRAKE SWITCH ......................................... 671
Component Description ........................................ 671
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... 671
Wiring Diagram .................................................... 672
Diagnostic Procedure ........................................... 675
Component Inspection ......................................... 680ASCD INDICATOR ..................................................681
Component Description ........................................681
CONSULT-III Reference Value in Data Monitor
Mode .....................................................................681
Wiring Diagram .....................................................682
Diagnostic Procedure ...........................................683
ELECTRICAL LOAD SIGNAL ................................684
Description ............................................................684
CONSULT-III Reference Value in Data Monitor
Mode .....................................................................684
Diagnostic Procedure ...........................................684
FUEL INJECTOR ....................................................686
Component Description ........................................686
CONSULT-III Reference Value in Data Monitor
Mode .....................................................................686
Wiring Diagram .....................................................687
Diagnostic Procedure ...........................................688
Component Inspection ..........................................690
Removal and Installation ......................................690
FUEL PUMP ............................................................691
Description ............................................................691
CONSULT-III Reference Value in Data Monitor
Mode .....................................................................691
Wiring Diagram .....................................................692
Diagnostic Procedure ...........................................693
Component Inspection ..........................................697
Removal and Installation ......................................697
IGNITION SIGNAL ..................................................698
Component Description ........................................698
Wiring Diagram .....................................................699
Diagnostic Procedure ...........................................704
Component Inspection ..........................................708
Removal and Installation ......................................709
REFRIGERANT PRESSURE SENSOR ..................710
Component Description ........................................710
Wiring Diagram .....................................................711
Diagnostic Procedure ...........................................712
Removal and Installation ......................................715
MIL AND DATA LINK CONNECTOR ......................716
Wiring Diagram .....................................................716
SERVICE DATA AND SPECIFICATIONS (SDS) ....718
Fuel Pressure .......................................................718
Idle Speed and Ignition Timing .............................718
Calculated Load Value ..........................................718
Mass Air Flow Sensor ...........................................718
Intake Air Temperature Sensor .............................718
Engine Coolant Temperature Sensor ...................718
Air Fuel Ratio (A/F) Sensor 1 Heater ....................718
Heated Oxygen sensor 2 Heater ..........................718
Crankshaft Position Sensor (POS) .......................718
Camshaft Position Sensor (PHASE) ....................718
Throttle Control Motor ...........................................719
Fuel Injector ..........................................................719
Fuel Pump ............................................................719

PREPARATION
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Commercial Service ToolsNBS0002F
Tool name
(Kent-Moore No.)Description
Leak detector
i.e.: (J-41416)Locating the EVAP leak
EVAP service port
adapter
i.e.: (J-41413-OBD)Applying positive pressure through EVAP service
port
Fuel filler cap adapter
i.e.: (MLR-8382)Checking fuel tank vacuum relief valve opening
pressure
Socket wrench Removing and installing engine coolant
temperature sensor
Oxygen sensor thread
cleaner
i.e.: (J-43897-18)
(J-43897-12)Reconditioning the exhaust system threads
before installing a new oxygen sensor. Use with
anti-seize lubricant shown below.
a: 18 mm diameter with pitch 1.5 mm for
Zirconia Oxygen Sensor
b: 12 mm diameter with pitch 1.25 mm for
Titania Oxygen Sensor
Anti-seize lubricant
i.e.: (Permatex
TM
133AR or equivalent
meeting MIL
specification MIL-A-
907)Lubricating oxygen sensor thread cleaning tool
when reconditioning exhaust system threads.
S-NT703
S-NT704
S-NT815
S-NT705
AEM488
S-NT779

EC-24
ENGINE CONTROL SYSTEM
Revision: 2006 November2007 350Z
ENGINE CONTROL SYSTEMPFP:23710
System DiagramNBS0002H
PBIB3466E
1. ECM 2. Data link connector 3. MIL
4. Ignition switch 5. Cooling fan 6. PNP switch
7. A/F sensor 1 8. Heated oxygen sensor 2 9.Exhaust valve timing control magnet
retarder
10.Exhaust valve timing control position
sensor11. PCV valve 12. Spark plug
13. Camshaft position sensor (PHASE) 14.Intake valve timing control solenoid
valve15. Fuel injector
16. Engine coolant temperature sensor 17. Fuel injector 18.Intake valve timing control solenoid
valve
19. Camshaft position sensor (PHASE) 20. Spark plug 21.Exhaust valve timing control position
sensor

ENGINE CONTROL SYSTEM
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Revision: 2006 November2007 350Z
Multiport Fuel Injection (MFI) SystemNBS0002I
INPUT/OUTPUT SIGNAL CHART
*1: This sensor is not used to control the engine system under normal conditions.
*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
ECM memory. The program value is preset by engine operating conditions. These conditions are determined
by input signals (for engine speed and intake air) from both the crankshaft position sensor and the mass air
flow sensor.
VARIOUS FUEL INJECTION INCREASE/DECREASE COMPENSATION
In addition, the amount of fuel injected is compensated to improve engine performance under various operat-
ing conditions as listed below.


During warm-up

When starting the engine

During acceleration

Hot-engine operation
22.Exhaust valve timing control magnet
retarder23. A/F sensor 1 24. Heated oxygen sensor 2
25. Knock sensor 26. Crankshaft position sensor (POS) 27. Engine oil temperature sensor
28. Knock sensor 29. Three way catalyst 1 30. Three way catalyst 2
31. Three way catalyst 1 32. Three way catalyst 2 33. Muffler
34. EVAP canister vent control valve 35.EVAP control system pressure sen-
sor36. EVAP service port
37.EVAP canister purge volume con-
trol solenoid valve38. EVAP canister 39. Fuel camper
40. Fuel pump 41. Fuel pressure regulator 42. Fuel level sensor
43. Fuel tank temperature sensor 44. Fuel tank 45. Accelerator pedal position sensor
46. Electric throttle control actuator 47. Throttle position sensor 48.Mass air flow sensor (with intake air
temperature sensor)
49. Air cleaner 50. Electric throttle control actuator 51. Throttle position sensor
52.Mass air flow sensor (with intake air
temperature sensor)53. Air cleaner
Sensor Input Signal to ECM ECM function Actuator
Crankshaft position sensor (POS)
Engine speed*
3
Piston position
Fuel injection
& mixture ratio
controlFuel injector Camshaft position sensor (PHASE)
Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Air fuel ratio (A/F) 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
Air conditioner switch
Air conditioner operation*
2
Wheel sensor
Vehicle speed*2

EC-26
ENGINE CONTROL SYSTEM
Revision: 2006 November2007 350Z

When selector lever is changed from N to D (A/T models)

High-load, high-speed operation


During deceleration

During high engine speed operation
MIXTURE RATIO FEEDBACK CONTROL (CLOSED LOOP CONTROL)
The mixture ratio feedback system provides the best air-fuel mixture ratio for driveability and emission control.
The three way catalyst 1 can then better reduce CO, HC and NOx emissions. This system uses air fuel ratio
(A/F) sensor 1 in the exhaust manifold to monitor whether the engine operation is rich or lean. The ECM
adjusts the injection pulse width according to the sensor voltage signal. For more information about air fuel
ratio (A/F) sensor 1, refer to EC-257, "
DTC P0131, P0151 A/F SENSOR 1" . This maintains the mixture ratio
within the range of stoichiometric (ideal air-fuel mixture).
This stage is referred to as the closed loop control condition.
Heated oxygen sensor 2 is located downstream of the three way catalyst 1. Even if the switching characteris-
tics of air fuel ratio (A/F) sensor 1 shift, the air-fuel ratio is controlled to stoichiometric by the signal from
heated oxygen sensor 2.
Open Loop Control
The open loop system condition refers to when the ECM detects any of the following conditions. Feedback
control stops in order to maintain stabilized fuel combustion.

Deceleration and acceleration

High-load, high-speed operation

Malfunction of air fuel ratio (A/F) sensor 1 or its circuit

Insufficient activation of air fuel ratio (A/F) sensor 1 at low engine coolant temperature

High engine coolant temperature

During warm-up

After shifting from N to D (A/T models)

When starting the engine
MIXTURE RATIO SELF-LEARNING CONTROL
The mixture ratio feedback control system monitors the mixture ratio signal transmitted from air fuel ratio (A/F)
sensor 1. This feedback signal is then sent to the ECM. The ECM controls the basic mixture ratio as close to
the theoretical mixture ratio as possible. However, the basic mixture ratio is not necessarily controlled as orig-
inally designed. Both manufacturing differences (i.e., mass air flow sensor hot wire) and characteristic
changes during operation (i.e., fuel injector clogging) directly affect mixture ratio.
Accordingly, the difference between the basic and theoretical mixture ratios is monitored in this system. This is
then computed in terms of “injection pulse duration” to automatically compensate for the difference between
the two ratios.
“Fuel trim” refers to the feedback compensation value compared against the basic injection duration. Fuel trim
includes short term fuel trim and long term fuel trim.
“Short term fuel trim” is the short-term fuel compensation used to maintain the mixture ratio at its theoretical
value. The signal from air fuel ratio (A/F) sensor 1 indicates whether the mixture ratio is RICH or LEAN com-
pared to the theoretical value. The signal then triggers a reduction in fuel volume if the mixture ratio is rich, and
an increase in fuel volume if it is lean.
PBIB3020E

ENGINE CONTROL SYSTEM
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“Long term fuel trim” is overall fuel compensation carried out long-term to compensate for continual deviation
of the short term fuel trim from the central value. Such deviation will occur due to individual engine differences,
wear over time and changes in the usage environment.
FUEL INJECTION TIMING
Two types of systems are used.
Sequential Multiport Fuel Injection System
Fuel is injected into each cylinder during each engine cycle according to the firing order. This system is used
when the engine is running.
Simultaneous Multiport Fuel Injection System
Fuel is injected simultaneously into all six cylinders twice each engine cycle. In other words, pulse signals of
the same width are simultaneously transmitted from the ECM.
The six fuel injectors will then receive the signals two times for each engine cycle.
This system is used when the engine is being started and/or if the fail-safe system (CPU) is operating.
FUEL SHUT-OFF
Fuel to each cylinder is cut off during deceleration, operation of the engine at excessively high speeds or oper-
ation of the vehicle at excessively high speeds.
Electronic Ignition (EI) SystemNBS0002J
INPUT/OUTPUT SIGNAL CHART
*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 DESCRIPTION
Firing order: 1-2-3-4-5-6
The ignition timing is controlled by the ECM to maintain the best air-fuel ratio for every running condition of the
engine. The ignition timing data is stored in the ECM.
The ECM receives information such as the injection pulse width and camshaft position sensor (PHASE) sig-
nal. Computing this information, ignition signals are transmitted to the power transistor.
During the following conditions, the ignition timing is revised by the ECM according to the other data stored in
the ECM.

At starting
SEF179U
Sensor Input Signal to ECM ECM function Actuator
Crankshaft position sensor (POS)
Engine speed*
2
Piston position
Ignition timing
controlPower transistor Camshaft position sensor (PHASE)
Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Throttle position sensor Throttle position
Accelerator pedal position sensor Accelerator pedal position
Knock sensor Engine knocking
Park/neutral position (PNP) switch Gear position
Battery
Battery voltage*
2
Wheel sensor
Vehicle speed*1

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ENGINE CONTROL SYSTEM
Revision: 2006 November2007 350Z

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.
Fuel Cut Control (at No Load and High Engine Speed)NBS0002K
INPUT/OUTPUT SIGNAL CHART
*: This signal is sent to the ECM through CAN communication line.
SYSTEM DESCRIPTION
If the engine speed is above 1,800 rpm under no load (for example, the shift position is neutral and engine
speed is over 1,800 rpm) fuel will be cut off after some time. The exact time when the fuel is cut off varies
based on engine speed.
Fuel cut will be operated until the engine speed reaches 1,500 rpm, then fuel cut will be cancelled.
NOTE:
This function is different from deceleration control listed under EC-25, "
Multiport Fuel Injection (MFI) System" .
Sensor Input Signal to ECM ECM function Actuator
Park/neutral position (PNP) switch Neutral position
Fuel cut con-
trolFuel injector Accelerator pedal position sensor Accelerator pedal position
Engine coolant temperature sensor Engine coolant temperature
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)Engine speed
Wheel sensor Vehicle speed*

AIR CONDITIONING CUT CONTROL
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Revision: 2006 November2007 350Z
AIR CONDITIONING CUT CONTROLPFP:23710
Input/Output Signal ChartNBS0002L
*1: This signal is sent to the ECM through CAN communication line.
*2: ECM determines the start signal status by the signal 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.
System DescriptionNBS006TJ
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 Throttle position sensor Throttle position
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
Refrigerant pressure sensor Refrigerant pressure
Power steering pressure sensor Power steering operation
Wheel sensor
Vehicle speed*
1
Battery
Battery voltage*2