Infiniti Q45 (FY33). Manual — part 118

ENGINE CONTROL SYSTEM

SECTION

EC

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)

″

AIR

BAG

″

and

″

SEAT BELT PRE-TENSIONER

″

. . . .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

TROUBLE DIAGNOSIS FOR INTERMITTENT
INCIDENT. . . . . . . . . . . . . . . . . . 117

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

TROUBLE DIAGNOSIS FOR DTC P0115 . . . . ..145

Engine Coolant Temperature Sensor (ECTS) . . .145

TROUBLE DIAGNOSIS FOR DTC P0120. . . . ..150

Throttle Position Sensor . . . . . . . . . . ..150

TROUBLE DIAGNOSIS FOR DTC P0125. . . . ..161

Engine Coolant Temperature (ECT) Sensor . . ...161

TROUBLE DIAGNOSIS FOR DTC P0130 (B1),
P0150 (B2) . . . . . . . . . . . . . . . . ...166

Heated Oxygen Sensor 1 (Front) (P0130: Bank
1), (P0150: Bank 2) (Circuit) . . . . . . . . ...166

TROUBLE DIAGNOSIS FOR DTC P0131 (B1),
P0151 (B2) . . . . . . . . . . . . . . . . ...174

Heated Oxygen Sensor 1 (Front) (P0131: Bank
1), (P0151: Bank 2) (Lean shift monitoring). . . 174

TROUBLE DIAGNOSIS FOR DTC P0132 (B1),
P0152 (B2) . . . . . . . . . . . . . . . . ...180

Heated Oxygen Sensor 1 (Front) (P0132: Bank
1), (P0152: Bank 2) (Rich Shift Monitoring) . . . 180

TROUBLE DIAGNOSIS FOR DTC P0133 (B1),
P0153 (B2) . . . . . . . . . . . . . . . . ...187

Heated Oxygen Sensor 1 (Front) (P0133: Bank
1), (P0153: Bank 2) (Response monitoring) . . ...187

TROUBLE DIAGNOSIS FOR DTC P0134 (B1),
P0154 (B2) . . . . . . . . . . . . . . . . ...196

Heated Oxygen Sensor 1 (Front) (P0134: Bank
1), (P0154: Bank 2) . . . . . . . . . . . . .196

TROUBLE DIAGNOSIS FOR DTC P0135 (B1),
P0155 (B2) . . . . . . . . . . . . . . . . ...204

Heated Oxygen Sensor 1 Heater (Front) (P0135:
Bank 1), (P0155: Bank 2). . . . . . . . . . 204

TROUBLE DIAGNOSIS FOR DTC P0137 (B1),
P0157 (B2) . . . . . . . . . . . . . . . . ...210

Heated Oxygen Sensor 2 (Rear) (P0137: Bank
1), (P0157: Bank 2) (Min. Voltage Monitoring). . 210

TROUBLE DIAGNOSIS FOR DTC P0138 (B1),
P0158 (B2) . . . . . . . . . . . . . . . . ...218

Heated Oxygen Sensor 2 (Rear) (P0138: Bank
1), (P0158: Bank 2) (Max. Voltage Monitoring). ...218

TROUBLE DIAGNOSIS FOR DTC P0139 (B1),
P0159 (B2) . . . . . . . . . . . . . . . . ...226

Heated Oxygen Sensor 2 (Rear) (P0139: Bank
1), (P0159: Bank 2) (Response Monitoring) . . ...226

TROUBLE DIAGNOSIS FOR DTC P0140 (B1),
P0160 (B2) . . . . . . . . . . . . . . . . ...233

Heated Oxygen Sensor 2 (Rear) (P0140: Bank
1), (P0160: Bank 2) (High voltage) . . . . . . .233

TROUBLE DIAGNOSIS FOR DTC P0141 (B1),
P0161 (B2) . . . . . . . . . . . . . . . . ...239

Heated Oxygen Sensor 2 Heaters (Rear)
(P0141: Bank 1), (P0161: Bank 2) . . . . . . ..239

TROUBLE DIAGNOSIS FOR DTC P0171 (B1),
P0174 (B2) . . . . . . . . . . . . . . . . ...245

Fuel Injection System Function (Lean side)
(P0171: Bank 1), (P0174: Bank 2) . . . . . . ..245

TROUBLE DIAGNOSIS FOR DTC P0172 (B1),
P0175 (B2) . . . . . . . . . . . . . . . . ...251

Fuel Injection System Function (Rich side)
(P0172: Left bank), (P0175: Right bank) . . . . 251

TROUBLE DIAGNOSIS FOR DTC P0180. . . . ..257

Fuel Tank Temperature Sensor . . . . . . . ...257

TROUBLE DIAGNOSIS FOR DTC P0300 - P0308. 262

No. 1 - 8 Cylinder Misfire, Multiple Cylinder
Misfire . . . . . . . . . . . . . . . . . ..262

TROUBLE DIAGNOSIS FOR DTC P0325 (B1),
P0330 (B2) . . . . . . . . . . . . . . . . ...267

Knock Sensor (KS) (P0325: Left bank), (P0330:
Right bank) . . . . . . . . . . . . . . . ..267

TROUBLE DIAGNOSIS FOR DTC P0335. . . . ..270

Crankshaft Position Sensor (CKPS) (OBD) . . . 270

TROUBLE DIAGNOSIS FOR DTC P0340. . . . ..275

Camshaft Position Sensor (CMPS) . . . . . . .275

TROUBLE DIAGNOSIS FOR DTC P0400. . . . ..281

EGR Function (Close) . . . . . . . . . . . .281

TROUBLE DIAGNOSIS FOR DTC P0402. . . . ..290

EGRC-BPT Valve Function . . . . . . . . . .290

TROUBLE DIAGNOSIS FOR DTC P0420 (B1),
P0430 (B2) . . . . . . . . . . . . . . . . ...295

Three Way Catalyst Function (P0420: Left bank),
(P0430: Right bank). . . . . . . . . . . . .295

TROUBLE DIAGNOSIS FOR DTC P0440. . . . ..298

Evaporative Emission (EVAP) Control System
(Small Leak) (Negative Pressure) . . . . . . ...298

TROUBLE DIAGNOSIS FOR DTC P0443. . . . ..309

Evaporative Emission (EVAP) Canister Purge
Volume Control Valve (Circuit) . . . . . . . . 309

TROUBLE DIAGNOSIS FOR DTC P0446. . . . ..315

Evaporative Emission (EVAP) Canister Vent
Control Valve (Circuit). . . . . . . . . . . ..315

TROUBLE DIAGNOSIS FOR DTC P0450. . . . ..320

Evaporative Emission (EVAP) Control System
Pressure Sensor . . . . . . . . . . . . . ..320

TROUBLE DIAGNOSIS FOR DTC P0455. . . . ..326

Evaporative Emission (EVAP) Control System
(Gross Leak) . . . . . . . . . . . . . . . 326

TROUBLE DIAGNOSIS FOR DTC P0500. . . . ..335

Vehicle Speed Sensor (VSS) . . . . . . . . ..335

TROUBLE DIAGNOSIS FOR DTC P0505. . . . ..340

Idle Air Control Valve (IACV) - Auxiliary Air
Control (AAC) Valve . . . . . . . . . . . . 340

TROUBLE DIAGNOSIS FOR DTC P0510. . . . ..346

Closed Throttle Position Switch. . . . . . . ...346

TROUBLE DIAGNOSIS FOR DTC P0600, P1605 . .352

A/T Communication Line (P0600) and A/T
Diagnostic Communication Line (P1605) . . . . 352

CONTENTS

(Cont’d)

EC-2

TROUBLE DIAGNOSIS FOR DTC P0605. . . . ..355

Engine Control Module (ECM) . . . . . . . . 355

TROUBLE DIAGNOSIS FOR DTC P1105 . . . . ..358

Manifold Absolute Pressure (MAP)/Barometric
Pressure (BARO) Switch Solenoid Valve. . . . 358

TROUBLE DIAGNOSIS FOR DTC P1110 (B1),
P1135 (B2) . . . . . . . . . . . . . . . . ...367

Intake Valve Timing Control (P1110: Left bank),
(P1135: Right bank). . . . . . . . . . . . .367

TROUBLE DIAGNOSIS FOR DTC P1120 . . . . ..375

Secondary Throttle Position Sensor (STPS). . ...375

TROUBLE DIAGNOSIS FOR DTC P1125 . . . . ..381

Tandem Throttle Position Sensor . . . . . . . 381

TROUBLE DIAGNOSIS FOR DTC P1140 (B1),
P1145 (B2) . . . . . . . . . . . . . . . . ...382

Intake Valve Timing Control Position Sensor
(P1140: Left bank), (P1145: Right bank) . . . . .382

TROUBLE DIAGNOSIS FOR DTC P1148 (B1),
P1168 (B2) . . . . . . . . . . . . . . . . ...388

Closed Loop Control (P1148: Left bank), (P1168:
Right bank) . . . . . . . . . . . . . . . ..388

TROUBLE DIAGNOSIS FOR DTC P1210. . . . ..390

Traction Control System (TCS) Signal Circuit. . .390

TROUBLE DIAGNOSIS FOR DTC P1220. . . . ..393

Fuel Pump Control Module (FPCM). . . . . . 393

TROUBLE DIAGNOSIS FOR DTC P1320. . . . ..399

Ignition Signal . . . . . . . . . . . . . . ..399

TROUBLE DIAGNOSIS FOR DTC P1336. . . . ..407

Crankshaft Position Sensor (CKPS) (OBD)
(COG) . . . . . . . . . . . . . . . . . ..407

TROUBLE DIAGNOSIS FOR DTC P1400. . . . ..412

EGRC-solenoid Valve . . . . . . . . . . . 412

TROUBLE DIAGNOSIS FOR DTC P1401. . . . ..417

EGR Temperature Sensor . . . . . . . . . ...417

TROUBLE DIAGNOSIS FOR DTC P1402. . . . ..423

EGR Function (Open). . . . . . . . . . . ..423

TROUBLE DIAGNOSIS FOR DTC P1440. . . . ..432

Evaporative Emission (EVAP) Control System
(Small Leak) (Positive Pressure). . . . . . . .432

TROUBLE DIAGNOSIS FOR DTC P1444. . . . ..444

Evaporative Emission (EVAP) Canister Purge
Volume Control Valve . . . . . . . . . . . ..444

TROUBLE DIAGNOSIS FOR DTC P1446. . . . ..452

Evaporative Emission (EVAP) Canister Vent
Control Valve (Close). . . . . . . . . . . ...452

TROUBLE DIAGNOSIS FOR DTC P1447. . . . ..457

Evaporative Emission (EVAP) Control System
Purge Flow Monitoring. . . . . . . . . . . .457

TROUBLE DIAGNOSIS FOR DTC P1448. . . . ..464

Evaporative Emission (EVAP) Canister Vent
Control Valve (Open) . . . . . . . . . . . ...464

TROUBLE DIAGNOSIS FOR DTC P1490. . . . ..470

Vacuum Cut Valve Bypass Valve (Circuit). . . ...470

TROUBLE DIAGNOSIS FOR DTC P1491. . . . ..475

Vacuum Cut Valve Bypass Valve . . . . . . . 475

TROUBLE DIAGNOSIS FOR DTC P1492. . . . ..481

Evaporative Emission (EVAP) Canister Purge
Control Valve/Solenoid Valve (Circuit). . . . . .481

TROUBLE DIAGNOSIS FOR DTC P1493. . . . ..487

Evaporative Emission (EVAP) Canister Purge
Control Valve/Solenoid Valve . . . . . . . . ..487

TROUBLE DIAGNOSIS FOR DTC P1706. . . . ..494

Park/Neutral Position (PNP) Switch . . . . . . 494

TROUBLE DIAGNOSIS FOR ABS/TCS C/U
SIGNAL . . . . . . . . . . . . . . . . . . 499

ABS/TCS Control Unit . . . . . . . . . . . .499

TROUBLE DIAGNOSIS FOR ECM - ABS/TCS
COMM NG. . . . . . . . . . . . . . . . . 500

ABS/TCS Communication Line . . . . . . . ...500

TROUBLE DIAGNOSIS FOR OVERHEAT . . . . .503

Overheat . . . . . . . . . . . . . . . . ..503

TROUBLE DIAGNOSIS FOR NON-DETECTABLE
ITEMS. . . . . . . . . . . . . . . . . . ...515

Injector . . . . . . . . . . . . . . . . . .515
Start Signal . . . . . . . . . . . . . . . ..521
Fuel Pump Control. . . . . . . . . . . . ...523
Power Steering Oil Pressure Switch . . . . . ...527
Electrical Load Signal . . . . . . . . . . . ..532
MIL & Data Link Connectors . . . . . . . . ...535

SERVICE DATA AND SPECIFICATIONS (SDS) . . 536

General Specifications. . . . . . . . . . . .536
Inspection and Adjustment . . . . . . . . . ..536

When you read wiring diagrams:

I

Read GI section, “HOW TO READ WIRING DIAGRAMS”.

I

See EL section, “POWER SUPPLY ROUTING” for power distribution circuit.

When you perform trouble diagnoses, read GI section, “HOW TO FOLLOW FLOW CHART IN
TROUBLE DIAGNOSES” and “HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL
INCIDENT”.

GI

MA

EM

LC

FE

AT

PD

FA

RA

BR

ST

RS

BT

HA

EL

IDX

CONTENTS

(Cont’d)

EC-3

Alphabetical & P No. Index for DTC

ALPHABETICAL INDEX FOR DTC

Items

(CONSULT-II screen

terms)

DTC*6

Reference

page

CONSULT-II

GST*2

ECM*1

*COOLAN T SEN/CIRC

P0125

0908

EC-161

A/T 1ST GR FNCTN

P0731

1103

AT-95

A/T 2ND GR FNCTN

P0732

1104

AT-100

A/T 3RD GR FNCTN

P0733

1105

AT-104

A/T 4TH GR FNCTN

P0734

1106

AT-108

A/T COMM LINE

P0600

0504

EC-352

A/T DIAG COMM LINE

P1605

0804

EC-352

A/T TCC S/V FNCTN

P0744

1107

AT-118

ABS-TCS C/U SIGNAL

—

0107

EC-500

ABSL PRES SEN/CIRC

P0105

0803

EC-132

AIR TEMP SEN/CIRC

P0110

0401

EC-140

ATF TEMP SEN/CIRC

P0710

1208

AT-85

CAM POS SEN/CIR

P0340

0101

EC-275

CLOSED LOOP-B1

P1148

0307

EC-388

CLOSED LOOP-B2

P1168

0308

EC-388

CLOSED TP SW/CIRC

P0510

0203

EC-346

COOLANT T SEN/CIRC

P0115

0103

EC-145

CPS/CIRC (OBD) COG

P1336

0905

EC-407

CPS/CIRCUIT (OBD)

P0335

0802

EC-270

CYL 1 MISFIRE

P0301

0608

EC-262

CYL 2 MISFIRE

P0302

0607

EC-262

CYL 3 MISFIRE

P0303

0606

EC-262

CYL 4 MISFIRE

P0304

0605

EC-262

CYL 5 MISFIRE

P0305

0604

EC-262

CYL 6 MISFIRE

P0306

0603

EC-262

CYL 7 MISFIRE

P0307

0602

EC-262

CYL 8 MISFIRE

P0308

0601

EC-262

ECM

P0605

0301

EC-355

ECM-ABSTCS COMM
NG

—

0404

EC-500

EGR SYSTEM

P0400

0302

EC-281

EGR SYSTEM

P1402

0514

EC-423

EGR TEMP SEN/CIRC

P1401

0305

EC-417

EGRC SOLENOID/V

P1400

1005

EC-412

EGRC-BPT VALVE

P0402

0306

EC-290

ENGINE SPEED SIG

P0725

1207

AT-92

EVAP PURG FLOW/
MON

P1447

0111

EC-457

EVAP SMALL LEAK

P1440

0213

EC-432

EVAP SMALL LEAK

P0440

0705

EC-298

EVAP SYS PRES SEN

P0450

0704

EC-320

EVAP GROSS LEAK

P0455

0715

EC-326

Items

(CONSULT-II screen

terms)

DTC*6

Reference

page

CONSULT-II

GST*2

ECM*1

FPCM/CIRCUIT

P1220

1305

EC-393

FUEL SYS LEAN/BK1

P0171

0115

EC-245

FUEL SYS LEAN/BK2

P0174

0210

EC-245

FUEL SYS RICH/BK1

P0172

0114

EC-251

FUEL SYS RICH/BK2

P0175

0209

EC-251

FUEL TEMP SEN/CIRC

P0180

0402

EC-257

HO2S1 (B1)

P0130

0303

EC-166

HO2S1 (B1)

P0133

0409

EC-187

HO2S1 (B1)

P0132

0410

EC-180

HO2S1 (B1)

P0131

0411

EC-174

HO2S1 (B1)

P0134

0412

EC-196

HO2S1 (B2)

P0153

0413

EC-187

HO2S1 (B2)

P0152

0414

EC-180

HO2S1 (B2)

P0151

0415

EC-174

HO2S1 (B2)

P0150

0503

EC-166

HO2S1 (B2)

P0154

0509

EC-196

HO2S1 HTR (B1)

P0135

0901

EC-204

HO2S1 HTR (B2)

P0155

1001

EC-204

HO2S2 (B1)

P0137

0511

EC-210

HO2S2 (B1)

P0140

0512

EC-233

HO2S2 (B1)

P0139

0707

EC-226

HO2S2 (B1)

P0138

0510

EC-218

HO2S2 (B2)

P0158

0313

EC-218

HO2S2 (B2)

P0157

0314

EC-210

HO2S2 (B2)

P0160

0315

EC-233

HO2S2 (B2)

P0159

0708

EC-226

HO2S2 HTR (B1)

P0141

0902

EC-239

HO2S2 HTR (B2)

P0161

1002

EC-239

IACV/AAC VLV/CIRC

P0505

0205

EC-340

IGN SIGNAL-PRIMARY

P1320

0201

EC-399

INT/V TIM CONT-B1

P1110

0805

EC-367

INT/V TIM CONT-B2

P1135

1301

EC-367

INTK TIM S/CIRC-B1

P1140

1303

EC-382

INTK TIM S/CIRC-B2

P1145

1304

EC-382

KNOCK SEN/CIRC-B1

P0325

0304

EC-267

KNOCK SEN/CIRC-B2

P0330

0212

EC-267

L/PRESS SOL/CIRC

P0745

1205

AT-125

MAF SEN/CIRCUIT*3

P0100

0102

EC-124

MAP/BAR SW SOL/CIR

P1105

1302

EC-358

MULTI CYL MISFIRE

P0300

0701

EC-262

NATS MALFUNCTION

—

—

EC-69

DIAGNOSTIC TROUBLE CODE INDEX

EC-4