Isuzu KB P190. Manual - part 881

Engine Management – V6 – Diagnostics 

Page 6C1-2–246 

 

N O T E  

After an ECU reset, the ignition switch must be 
turned Off for at least 10 seconds and then 
turned On for at least one minute, before 
attempting communication between Tech 2 and 
the ECU. 

 

Preconditions:  The four digit security code must be entered into Tech 2 and the theft deterrent system 
must be disarmed and the ignition switched ‘On’ with a programmed remote coded key. 

F2:  Fuel Trim Reset: This function resets the fuel trim data values learned by the ECM. 

F3: Throttle Body Relearn: In this mode, Tech 2 commands the throttle plate from its rest position to full closed 

then to about 10% open. This procedure takes approximately 6 – 8 seconds. At the start of this procedure, 
the Tech 2, ‘Electronic Throttle Control Learn Counter’ parameter should display ‘0’ then count up to 11, after 
the procedure is completed. If the counter does not start at ‘0’, nor display a count of ‘11’ at the conclusion of 
the procedure, a fault has occurred and a DTC will set. 

 

Engine Management – V6 – Service Operations 

Page 6C1-3–1 

 

6C1-3 

Engine Management – V6 – Service Operations 

A T T E N T I O N  

Before performing any service operation or other procedure described in this Section, refer to 1.4  Warning 
Caution and Notes for correct workshop practices with regard to safety and / or property damage. 

1

 

General Information ...............................................................................................................................4

 

1.1

 

General Description............................................................................................................................................... 4

 

1.2

 

Service Precautions and Requirements............................................................................................................... 4

 

Service Precautions............................................................................................................................................... 4

 

Service Requirements ........................................................................................................................................... 5

 

Basic Knowledge Required ................................................................................................................................ 5

 

Basic Diagnostic Tools Required ......................................................................................................................... 6

 

1.3

 

Service Operations Not Covered In This Section................................................................................................ 6

 

Air-conditioning System........................................................................................................................................ 6

 

Electrical Components .......................................................................................................................................... 6

 

Fuel System............................................................................................................................................................ 6

 

Transmission – Automatic .................................................................................................................................... 7

 

Transmission – Manual ......................................................................................................................................... 7

 

1.4

 

Warning Caution and Notes .................................................................................................................................. 7

 

Definition of WARNING, CAUTION and NOTE Statements................................................................................. 7

 

WARNING defined ............................................................................................................................................. 7

 

CAUTION defined .............................................................................................................................................. 7

 

NOTE defined..................................................................................................................................................... 7

 

2

 

General Service Operations ..................................................................................................................9

 

2.1

 

Accelerator Pedal Position Sensor ...................................................................................................................... 9

 

Remove ................................................................................................................................................................... 9

 

Reinstall .................................................................................................................................................................. 9

 

2.2

 

Air Cleaner Assembly............................................................................................................................................ 9

 

Air Cleaner Upper Housing ................................................................................................................................... 9

 

Remove.............................................................................................................................................................. 9

 

Reinstall ........................................................................................................................................................... 10

 

Air Cleaner Lower Housing Assembly ............................................................................................................... 10

 

Remove............................................................................................................................................................ 10

 

Reinstall ........................................................................................................................................................... 11

 

2.3

 

Barometric Pressure Sensor............................................................................................................................... 11

 

Remove ................................................................................................................................................................. 11

 

Reinstall ................................................................................................................................................................ 12

 

2.4

 

Camshaft Position Sensor .................................................................................................................................. 12

 

Remove ................................................................................................................................................................. 12

 

Reinstall ................................................................................................................................................................ 13

 

2.5

 

Crankshaft Position Sensor ................................................................................................................................ 13

 

Remove ................................................................................................................................................................. 13

 

Test ....................................................................................................................................................................... 15

 

Resistance Check ............................................................................................................................................ 15

 

Reinstall ................................................................................................................................................................ 15

 

2.6

 

Engine Coolant Temperature Sensor................................................................................................................. 16

 

Remove ................................................................................................................................................................. 16

 

Test ....................................................................................................................................................................... 17

 

Resistance Check ............................................................................................................................................ 17

 

Reinstall ................................................................................................................................................................ 18

 

2.7

 

Engine Control Module........................................................................................................................................ 18

 

Remove ................................................................................................................................................................. 19

 

Engine Management – V6 – Service Operations 

Page 6C1-3–2 

 

Reinstall ................................................................................................................................................................ 20

 

ECM Reset ............................................................................................................................................................ 20

 

2.8

 

Engine Control Module Bracket Assembly........................................................................................................ 21

 

Remove ................................................................................................................................................................. 21

 

Reinstall ................................................................................................................................................................ 21

 

2.9

 

Engine Oil Level and Temperature Sensor ........................................................................................................ 22

 

Remove ................................................................................................................................................................. 22

 

Test ....................................................................................................................................................................... 23

 

Engine Oil Level Sensor Check........................................................................................................................ 23

 

Reinstall ................................................................................................................................................................ 23

 

2.10

 

Engine Oil Pressure Sensor................................................................................................................................ 23

 

Remove ................................................................................................................................................................. 23

 

Reinstall ................................................................................................................................................................ 24

 

2.11

 

Evaporative Emission (EVAP) Canister Purge Valve Quick Connect Fittings................................................ 24

 

Disconnect............................................................................................................................................................ 24

 

Locking Lever Type .......................................................................................................................................... 25

 

Latch Type ....................................................................................................................................................... 25

 

Connect............................................................................................................................................................ 25

 

2.12

 

Evaporative Emission Canister Purge Valve ..................................................................................................... 26

 

Remove ................................................................................................................................................................. 26

 

Test ....................................................................................................................................................................... 27

 

Resistance Check ............................................................................................................................................ 27

 

Functional Test................................................................................................................................................. 27

 

Reinstall ................................................................................................................................................................ 28

 

2.13

 

Fuel Rail Assembly .............................................................................................................................................. 28

 

Remove ................................................................................................................................................................. 28

 

Disassemble ......................................................................................................................................................... 30

 

Fuel Injector ..................................................................................................................................................... 30

 

Fuel Injector Wiring Harness Assembly............................................................................................................ 32

 

Reinstall ................................................................................................................................................................ 33

 

2.14

 

Heated Oxygen Sensor........................................................................................................................................ 33

 

Service Precautions............................................................................................................................................. 33

 

Six Wire Sensor................................................................................................................................................ 34

 

Four Wire Sensor ............................................................................................................................................. 35

 

Test ....................................................................................................................................................................... 37

 

Heater Resistance Check – Six Wire HO2S..................................................................................................... 37

 

Heater Resistance Check – Four Wire HO2S .................................................................................................. 37

 

2.15

 

Ignition Coil .......................................................................................................................................................... 38

 

Ignition Coils ........................................................................................................................................................ 38

 

Remove............................................................................................................................................................ 38

 

Disassemble..................................................................................................................................................... 39

 

Reassemble ..................................................................................................................................................... 39

 

Test .................................................................................................................................................................. 39

 

Reinstall ........................................................................................................................................................... 40

 

2.16

 

Intake Air Duct Assembly.................................................................................................................................... 40

 

Remove ................................................................................................................................................................. 40

 

Reinstall ................................................................................................................................................................ 40

 

2.17

 

Intake Air Temperature Sensor........................................................................................................................... 41

 

Test ....................................................................................................................................................................... 41

 

Resistance Check ............................................................................................................................................ 41

 

2.18

 

Knock Sensor, Bank 2 (LHS)............................................................................................................................... 42

 

Remove ................................................................................................................................................................. 42

 

Reinstall ................................................................................................................................................................ 43

 

2.19

 

Knock Sensor, Bank 1 (RHS) .............................................................................................................................. 43

 

Remove ................................................................................................................................................................. 43

 

Reinstall ................................................................................................................................................................ 44

 

2.20

 

Mass Air Flow Sensor.......................................................................................................................................... 45

 

Handling Precautions .......................................................................................................................................... 45

 

Remove ................................................................................................................................................................. 45

 

Reinstall ................................................................................................................................................................ 46

 

Engine Management – V6 – Service Operations 

Page 6C1-3–3 

 

2.21

 

Schrader Valve – Fuel Pressure Gauge Connection Point............................................................................... 47

 

Remove ................................................................................................................................................................. 47

 

Reinstall ................................................................................................................................................................ 47

 

2.22

 

Spark Plugs .......................................................................................................................................................... 48

 

Service Precautions............................................................................................................................................. 48

 

Remove ................................................................................................................................................................. 48

 

Inspect .................................................................................................................................................................. 48

 

Spark Plug Inspection ......................................................................................................................................... 49

 

Poor Spark Plug Performance.......................................................................................................................... 49

 

Analysis of Spark Plug Condition ..................................................................................................................... 51

 

Reinstall ................................................................................................................................................................ 53

 

2.23

 

Throttle Body Assembly...................................................................................................................................... 53

 

Handling Precautions .......................................................................................................................................... 53

 

Remove ................................................................................................................................................................. 53

 

Inspect .................................................................................................................................................................. 55

 

Reinstall ................................................................................................................................................................ 55

 

3

 

Specifications .......................................................................................................................................57

 

4

 

Assembly Lubricants ...........................................................................................................................60

 

5

 

Torque Specifications ..........................................................................................................................61

 

6

 

Special Tools ........................................................................................................................................62