Isuzu engine C22NE / 22LE / 20LE. Manual - part 48

DRIVEABILITY AND EMISSIONS  6E1-21

PAGE

Installation............................................................................................................... 6E1-281

WEATHER-PACK CONNECTOR ................................................................................. 6E1-282

Tools Required........................................................................................................ 6E1-282

Removal................................................................................................................... 6E1-282

Installation............................................................................................................... 6E1-283

COM-PACK III............................................................................................................... 6E1-283

METRI-PACK ................................................................................................................ 6E1-283

Tools Required........................................................................................................ 6E1-283

Removal................................................................................................................... 6E1-283

Installation............................................................................................................... 6E1-284

GENERAL DESCRIPTION............................................................................................ 6E1-285

ECM AND SENSORS ................................................................................................... 6E1-285

58X REFERENCE ECM INPUT .................................................................................... 6E1-285

A/C REQUEST SIGNAL................................................................................................ 6E1-285

CRANKSHAFT POSITION (CKP) SENSOR................................................................. 6E1-285

ENGINE COOLANT TEMPERATURE (ECT) SENSOR ............................................... 6E1-286

FUEL CONTROL HEATED OXYGEN SENSOR (IF APPLICABLE) ............................ 6E1-286

INTAKE AIR TEMPERATURE (IAT) SENSOR ............................................................. 6E1-287

MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR ............................................... 6E1-287

ENGINE CONTROL MODULE (ECM) .......................................................................... 6E1-287

ECM FUNCTION ........................................................................................................... 6E1-288

ECM COMPONENTS.................................................................................................... 6E1-288

ECM VOLTAGE DESCRIPTION................................................................................... 6E1-288

ECM INPUT/OUTPUTS................................................................................................. 6E1-289

Input-Operating Conditions Read.......................................................................... 6E1-289

Outputs-Systems Controlled ................................................................................. 6E1-289

ECM SERVICE PRECAUTIONS................................................................................... 6E1-289

THROTTLE POSITION SENSOR (TPS)....................................................................... 6E1-290

VEHICLE SPEED SENSOR (VSS) ............................................................................... 6E1-290

USE OF CIRCUIT TESTING TOOLS............................................................................ 6E1-290

AFTERMARKET ELECTRICAL AND VACUUM EQUIPMENT..................................... 6E1-291

ELECTROSTATIC DISCHARGE DAMAGE.................................................................. 6E1-291

AIR INDUCTION ........................................................................................................... 6E1-292

AIR INDUCTION SYSTEM............................................................................................ 6E1-292

6E1-22  DRIVEABILITY AND EMISSIONS

PAGE

FUEL METERING ......................................................................................................... 6E1-292

ACCELERATION MODE .............................................................................................. 6E1-292

ACCELERATOR CONTROLS ...................................................................................... 6E1-292

BATTERY VOLTAGE CORRECTION MODE............................................................... 6E1-293

CLEAR FLOOD MODE ................................................................................................. 6E1-293

DECELERATION FUEL CUTOFF (DFCO) MODE ....................................................... 6E1-293

ENGINE SPEED/VEHICLE SPEED/FUEL DISABLE MODE ....................................... 6E1-293

FUEL CUTOFF MODE.................................................................................................. 6E1-293

FUEL INJECTOR .......................................................................................................... 6E1-293

FUEL METERING SYSTEM COMPONENTS ............................................................... 6E1-294

Basic System Operation......................................................................................... 6E1-294

FUEL METERING SYSTEM PURPOSE ....................................................................... 6E1-294

FUEL PRESSURE REGULATOR................................................................................. 6E1-295

FUEL PUMP ELECTRICAL CIRCUIT........................................................................... 6E1-295

FUEL RAIL.................................................................................................................... 6E1-295

IDLE AIR CONTROL (IAC) VALVE .............................................................................. 6E1-296

RUN MODE (APPLICABLE TO CLOSED LOOP SYSTEMS) ...................................... 6E1-296

STARTING MODE ........................................................................................................ 6E1-297

THROTTLE BODY UNIT............................................................................................... 6E1-297

ELECTRONIC IGNITION SYSTEM............................................................................... 6E1-297

CRANKSHAFT POSITION (CKP) SENSOR................................................................. 6E1-297

ELECTRONIC IGNITON ............................................................................................... 6E1-297

IGNITION COILS........................................................................................................... 6E1-298

IGNITION CONTROL.................................................................................................... 6E1-298

IGNITION CONTROL ECM OUTPUT ........................................................................... 6E1-298

ENGINE CONTROL MODULE (ECM) .......................................................................... 6E1-298

SPARK PLUG ............................................................................................................... 6E1-299

A/C CLUTCH DIAGNOSIS............................................................................................ 6E1-301

A/C CLUTCH CIRCUIT OPERATION ........................................................................... 6E1-301

A/C CLUTCH CIRCUIT PURPOSE............................................................................... 6E1-301

A/C REQUEST SIGNAL................................................................................................ 6E1-301

EVAPORATIVE EMISSION (EVAP) SYSTEM (IF APPLICABLE)................................ 6E1-302

EVAP EMISSION CONTROL SYSTEM PURPOSE ..................................................... 6E1-302

EVAP EMISSION CONTROL SYSTEM OPERATION.................................................. 6E1-302

DRIVEABILITY AND EMISSIONS  6E1-23

PAGE

SYSTEM FALUT DETECTION ..................................................................................... 6E1-303

POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM ........................................... 6E1-304

CRANKCASE VENTILATION SYSTEM PURPOSE ..................................................... 6E1-304

SPECIAL SERVICE TOOLS ......................................................................................... 6E1-305

6E1-24  DRIVEABILITY AND EMISSIONS

SPECIFICATIONS

Tightening Specifications

Application

N

⋅⋅⋅⋅

m

Lb Ft.

Lb In.

Crankshaft Position Sensor Mounting Bolt

9

-

78

Engine Coolant Temperature Sensor

30

22

-

Fuel Pressure Regulator Attaching Screw

6.5

-

60

Fuel Rail Bolts

7

-

75

Heated Oxygen Sensor (If applicable)

5

40

-

Spark Plugs

25

18

-

Throttle Body Mounting Bolts

13

-

120

VSS Retaining Bolt

13

-

120

Intake Manifold to Cylinder Head

22

16

-

EMISSION CONTROL SYSTEM SCHEMATICS

1

10 11 12 13 14 15 16

2 3 4 5 6 7 8

9

ROLL OVER&
FLOAT VALVE

FUEL PUMP

TWC CONVERTER

CRANKSHAFT
POSITION SENSOR

KNOCK SENSOR

COOLANT
TEMPERATURE 
SENSOR

FUEL INJECTOR

MAP SENSOR

AIR CLEANER

HEATED
OXYGEN SENSOR

IGNITION PLUG

IAT SENSOR

THROTTLE
BODY

THROTTLE 
POSITION SENSOR

IAC
VALVE

IGNITION
COIL

DUTY
SOLENOID
VALVE

CHARCOAL
CANISTER

FUEL PRESSURE
CONTROL VALVE

FUEL FILTER

FUEL PUMP
RELAY

CHECK VLV

BATTERY

+12V
IGUNITION

10A FUSE
(STOP)

DIAG

SDATA

DATA LINK
CONNECTOR

ENGINE CONTROL MODULE

METER CLUSTER

TACHO SIGNAL OUT

SPEED METER

VEHICLE SPEED SENSOR

A/C CLUTCH
A/C REQUEST
POWER STEERING SWITCH

MIL LAMP(CHECK ENGINE)

*

*

*

*

*

Refer to the matrix for engine specification, page 6A-11 thru 6A-17.

*  If equipped.