Infiniti Q45 (FY33). Manual - part 118
ENGINE CONTROL SYSTEM
CONTENTS
DIAGNOSTIC TROUBLE CODE INDEX.........................4
Alphabetical & P No. Index for DTC ...........................4
PRECAUTIONS AND PREPARATION............................8
Special Service Tool ....................................................8
Commercial Service Tools ...........................................8
Supplemental Restraint System (SRS)
.............10
Precautions for On Board Diagnostic (OBD)
System of Engine and A/T.........................................10
Engine Fuel & Emission Control System .................. 11
Precautions ................................................................12
ENGINE AND EMISSION CONTROL OVERALL
SYSTEM.........................................................................14
Circuit Diagram ..........................................................14
System Diagram ........................................................16
Engine Control Component Parts Location...............17
Vacuum Hose Drawing ..............................................19
System Chart .............................................................20
ENGINE AND EMISSION BASIC CONTROL
SYSTEM DESCRIPTION ...............................................21
Multiport Fuel Injection (MFI) System .......................21
Electronic Ignition (EI) System ..................................23
Air Conditioning Cut Control......................................24
Fuel Cut Control (at no load & high engine
speed) ........................................................................25
EVAPORATIVE EMISSION SYSTEM ...........................26
Description .................................................................26
Inspection...................................................................26
Evaporative Emission Line Drawing..........................29
On Board Refueling Vapor Recovery (ORVR) ..........31
POSITIVE CRANKCASE VENTILATION......................36
Description .................................................................36
Inspection...................................................................36
BASIC SERVICE PROCEDURE ...................................37
Fuel Pressure Release ..............................................37
Fuel Pressure Check .................................................37
Injector Removal and Installation ..............................38
Throttle Opener..........................................................39
Fast Idle Cam (FIC) Inspection and Adjustment .......40
Direct Ignition System - How to Check Idle
Speed and Ignition Timing.........................................40
Idle Speed/Ignition Timing/Idle Mixture Ratio
Adjustment .................................................................42
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION ...............................................................49
Introduction ................................................................49
Two Trip Detection Logic ...........................................49
Emission-related Diagnostic Information ...................50
Malfunction Indicator Lamp (MIL)..............................65
OBD System Operation Chart ...................................69
CONSULT-II ...............................................................74
Generic Scan Tool (GST) ..........................................85
TROUBLE DIAGNOSIS - Introduction ........................87
Introduction ................................................................87
Diagnostic Worksheet................................................87
TROUBLE DIAGNOSIS - Work Flow...........................89
Work Flow..................................................................89
Description for Work Flow .........................................90
TROUBLE DIAGNOSIS - Basic Inspection ................91
Basic Inspection.........................................................91
TROUBLE DIAGNOSIS - General Description...........97
Diagnostic Trouble Code (DTC) Inspection
Priority Chart..............................................................97
Fail-Safe Chart...........................................................98
Symptom Matrix Chart...............................................99
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................102
Major Sensor Reference Graph in Data Monitor
Mode ........................................................................105
ECM Terminals and Reference Value .....................107
Description ............................................................... 117
Common I/I Report Situations ................................. 117
Diagnostic Procedure .............................................. 117
TROUBLE DIAGNOSIS FOR POWER SUPPLY ........ 118
Main Power Supply and Ground Circuit.................. 118
TROUBLE DIAGNOSIS FOR DTC P0100..................124
Mass Air Flow Sensor (MAFS) ................................124
TROUBLE DIAGNOSIS FOR DTC P0105..................132
Absolute Pressure Sensor.......................................132
TROUBLE DIAGNOSIS FOR DTC P0110 ..................140
Intake Air Temperature Sensor................................140
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX