2007 NISSAN 350Z air conditioning

EC-1
ENGINE CONTROL SYSTEM
B ENGINE
CONTENTS
C
D
E
F
G
H
I
J
K
L
M
SECTION EC
A
EC
Revision: 2006 November2007 350Z
ENGINE CONTROL SYSTEM
INDEX FOR DTC ........................................................ 8
DTC No. Index ......................................................... 8
Alphabetical Index .................................................. 13
PRECAUTIONS ........................................................ 18
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ................................................................ 18
Precautions for Battery Service .............................. 18
Precautions for Procedures without Cowl Top Cover ... 18
On Board Diagnostic (OBD) System of Engine and
A/T .......................................................................... 18
Precaution .............................................................. 19
PREPARATION ......................................................... 22
Special Service Tools ............................................. 22
Commercial Service Tools ...................................... 23
ENGINE CONTROL SYSTEM .................................. 24
System Diagram ..................................................... 24
Multiport Fuel Injection (MFI) System .................... 25
Electronic Ignition (EI) System ............................... 27
Fuel Cut Control (at No Load and High Engine
Speed) .................................................................... 28
AIR CONDITIONING CUT CONTROL ..................... 29
Input/Output Signal Chart ....................................... 29
System Description ................................................ 29
AUTOMATIC SPEED CONTROL DEVICE (ASCD) ... 30
System Description ................................................ 30
Component Description .......................................... 31
CAN COMMUNICATION .......................................... 32
System Description ................................................ 32
EVAPORATIVE EMISSION SYSTEM ....................... 33
Description ............................................................. 33
Component Inspection ........................................... 36
Removal and Installation ........................................ 37
How to Detect Fuel Vapor Leakage ....................... 37
ON BOARD REFUELING VAPOR RECOVERY
(ORVR) ...................................................................... 39
System Description ................................................ 39
Diagnostic Procedure ............................................. 40
Component Inspection ........................................... 42
POSITIVE CRANKCASE VENTILATION ................. 44Description .............................................................. 44
Component Inspection ............................................ 45
NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM-
NATS) ........................................................................ 46
Description .............................................................. 46
ON BOARD DIAGNOSTIC (OBD) SYSTEM ............ 47
Introduction ............................................................. 47
Two Trip Detection Logic ........................................ 47
Emission-related Diagnostic Information ................ 48
Malfunction Indicator Lamp (MIL) ........................... 62
OBD System Operation Chart ................................ 65
BASIC SERVICE PROCEDURE ............................... 71
Basic Inspection ..................................................... 71
Idle Speed and Ignition Timing Check .................... 76
Procedure After Replacing ECM ............................ 76
VIN Registration ..................................................... 76
Exhaust Valve Timing Control Learning .................. 76
Accelerator Pedal Released Position Learning ...... 77
Throttle Valve Closed Position Learning ................. 77
Idle Air Volume Learning ........................................ 77
Fuel Pressure Check .............................................. 79
TROUBLE DIAGNOSIS ............................................ 81
Trouble Diagnosis Introduction ............................... 81
DTC Inspection Priority Chart ................................. 87
Fail-safe Chart ........................................................ 89
Symptom Matrix Chart ............................................ 90
Engine Control Component Parts Location ............ 94
Vacuum Hose Drawing .........................................100
Circuit Diagram .....................................................101
ECM Harness Connector Terminal Layout ...........103
ECM Terminals and Reference Value ...................103
CONSULT-III Function (ENGINE) .........................116
Generic Scan Tool (GST) Function .......................125
CONSULT-III Reference Value in Data Monitor ....127
TROUBLE DIAGNOSIS - SPECIFICATION VALUE .132
Description ............................................................132
Testing Condition ..................................................132
Inspection Procedure ............................................132
Diagnostic Procedure ...........................................133
TROUBLE DIAGNOSIS FOR INTERMITTENT INCI-

AIR CONDITIONING CUT CONTROL
EC-29
C
D
E
F
G
H
I
J
K
L
MA
EC
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