Nissan Pathfinder Ec

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B ENGINE

SECTION

ENGINE CONTROL SYSTEM

EC

A

EC

C

D

CONTENTSINDEX FOR DTC ....................................................... 9 . DTC No. Index ........................................................ 9 . Alphabetical Index ................................................. 13 . PRECAUTIONS ....................................................... 17 . Precautions for Supplemental Restraint System (SRS) AIR BAG and SEAT BELT PRE-TENSIONER ............................................................... 17 . Precautions for Procedures without Cowl Top Cover 17 ... On Board Diagnostic (OBD) System of Engine and A/T ......................................................................... 17 . Precaution ............................................................. 18 . PREPARATION ........................................................ 21 . Special Service Tools ............................................ 21 . Commercial Service Tools ..................................... 22 . ENGINE CONTROL SYSTEM ................................. 23 . System Diagram .................................................... 23 . Multiport Fuel Injection (MFI) System ................... 24 . Electronic Ignition (EI) System .............................. 26 . Fuel Cut Control (at No Load and High Engine Speed) ................................................................... 27 . AIR CONDITIONING CUT CONTROL .................... 28 . Input/Output Signal Chart ...................................... 28 . System Description ............................................... 28 . AUTOMATIC SPEED CONTROL DEVICE (ASCD) 29 ... System Description ............................................... 29 . Component Description ......................................... 30 . CAN COMMUNICATION ......................................... 31 . System Description ............................................... 31 . EVAPORATIVE EMISSION SYSTEM ...................... 32 . Description ............................................................ 32 . Component Inspection .......................................... 35 . Removal and Installation ....................................... 36 . How to Detect Fuel Vapor Leakage ...................... 36 . ON BOARD REFUELING VAPOR RECOVERY (ORVR) ..................................................................... 39 . System Description ............................................... 39 . Diagnostic Procedure ............................................ 40 . Component Inspection .......................................... 42 . POSITIVE CRANKCASE VENTILATION ................ 44 . Description ............................................................. 44 . Component Inspection ........................................... 44 . NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEMNATS) ....................................................................... 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) .......................... 61 . OBD System Operation Chart ............................... 64 . BASIC SERVICE PROCEDURE .............................. 70 . Basic Inspection .................................................... 70 . Idle Speed and Ignition Timing Check ................... 75 . Procedure After Replacing ECM ........................... 76 . VIN Registration .................................................... 76 . Accelerator Pedal Released Position Learning ..... 77 . Throttle Valve Closed Position Learning ................ 77 . Idle Air Volume Learning ....................................... 77 . Fuel Pressure Check ............................................. 79 . TROUBLE DIAGNOSIS ........................................... 82 . Trouble Diagnosis Introduction .............................. 82 . DTC Inspection Priority Chart ................................ 88 . Fail-safe Chart ....................................................... 90 . Symptom Matrix Chart ........................................... 91 . Engine Control Component Parts Location ........... 95 . Vacuum Hose Drawing ........................................ 102 . Circuit Diagram .................................................... 103 . ECM Harness Connector Terminal Layout .......... 105 . ECM Terminals and Reference Value .................. 105 . CONSULT-II Function (ENGINE) ......................... 114 . Generic Scan Tool (GST) Function ...................... 126 . CONSULT-II Reference Value in Data Monitor .... 129 . Major Sensor Reference Graph in Data Monitor Mode .................................................................... 133 . TROUBLE DIAGNOSIS - SPECIFICATION VALUE 135 . Description ........................................................... 135 . Testing Condition ................................................. 135 . Inspection Procedure ........................................... 135 . Diagnostic Procedure .......................................... 136 .

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Revision: September 2006

EC-1

2007 Pathfinder

TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ...................................................................... 145 . Description ........................................................... 145 . Diagnostic Procedure .......................................... 145 . POWER SUPPLY AND GROUND CIRCUIT .......... 146 . Wiring Diagram .................................................... 146 . Diagnostic Procedure .......................................... 149 . Ground Inspection ............................................... 153 . DTC U1000, U1001 CAN COMMUNICATION LINE. 154 Description ........................................................... 154 . On Board Diagnosis Logic ................................... 154 . DTC Confirmation Procedure .............................. 154 . Wiring Diagram .................................................... 155 . Diagnostic Procedure .......................................... 156 . DTC U1010 CAN COMMUNICATION .................... 157 . Description ........................................................... 157 . On Board Diagnosis Logic ................................... 157 . DTC Confirmation Procedure .............................. 157 . Diagnostic Procedure .......................................... 158 . DTC P0011, P0021 IVT CONTROL ....................... 159 . Description ........................................................... 159 . CONSULT-II Reference Value in Data Monitor Mode . 159 On Board Diagnosis Logic ................................... 160 . DTC Confirmation Procedure .............................. 160 . Diagnostic Procedure .......................................... 161 . Component Inspection ......................................... 162 . Removal and Installation ..................................... 162 . DTC P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER ................................................................. 163 . Description ........................................................... 163 . CONSULT-II Reference Value in Data Monitor Mode . 163 On Board Diagnosis Logic ................................... 163 . DTC Confirmation Procedure .............................. 163 . Wiring Diagram .................................................... 165 . Diagnostic Procedure .......................................... 168 . Component Inspection ......................................... 170 . Removal and Installation ..................................... 170 . DTC P0037, P0038, P0057, P0058 HO2S2 HEATER 171 . Description ........................................................... 171 . CONSULT-II Reference Value in Data Monitor Mode . 171 On Board Diagnosis Logic ................................... 171 . DTC Confirmation Procedure .............................. 172 . Wiring Diagram .................................................... 173 . Diagnostic Procedure .......................................... 176 . Component Inspection ......................................... 178 . Removal and Installation ..................................... 179 . DTC P0075, P0081 IVT CONTROL SOLENOID VALVE .................................................................... 180 . Component Description ....................................... 180 . CONSULT-II Reference Value in Data Monitor Mode . 180 On Board Diagnosis Logic ................................... 180 . DTC Confirmation Procedure .............................. 180 . Wiring Diagram .................................................... 181 . Diagnostic Procedure .......................................... 185 . Revision: September 2006

Component Inspection ......................................... 186 . Removal and Installation ...................................... 186 . DTC P0101 MAF SENSOR .................................... 187 . Component Description ....................................... 187 . CONSULT-II Reference Value in Data Monitor Mode .187 On Board Diagnosis Logic ................................... 187 . DTC Confirmation Procedure ............................... 188 . Overall Function Check ........................................ 189 . Wiring Diagram .................................................... 190 . Diagnostic Procedure ........................................... 191 . Component Inspection ......................................... 193 . Removal and Installation ...................................... 195 . DTC P0102, P0103 MAF SENSOR ........................ 196 . Component Description ..............