2007 ISUZU KB P190 audio

Engine Control System (4JH1) 6E-283
Description And Operation
Engine Control Module (ECM) Description



RTW 66ESH001201
The engine control module (ECM) is designed to
withstand normal current draws associated with vehicle
operation. Avoid overloading any circuit. W hen testing
for opens and shorts, do not ground or apply voltage to
any of the ECM circuits unless instructed to do so. In
some cases, these circuits should only be tested using
a digital multi meter (DMM). The ECM should remain
connected to the ECM harness.
The ECM is located on the floor panel. The ECM mainl
y
controls the following.
• The fuel system control
• The exhaust gas recirculation (EGR) system
control
• The preheating (glow) system control
• The A/C compressor control
• On-board diagnostics for engine control
The ECM constantly observes the information from
various sensor s. The ECM controls the systems that
affect vehicle performance. The ECM performs the
diagnostic function of the system. The ECM can
recognize operational problems, alert the driver through
the malfunction indicator lamp (MIL), and store
diagnostic trouble codes (DTCs). DTCs identify the
system faults to aid the technician in making repairs.





ECM Voltage Description
The ECM supplies a buffered voltage to various
switches and sensor s. The ECM can do this because
resistance in the ECM is so high in value that a test
lamp may not illuminate when connected to the circuit.
An ordinary shop voltmeter may not give an accurate
reading because the voltmeter input impedance is too
low. Use a 10-megaohm input impedance DMM, to
ensure accurate voltage readings. The input and/o
r
output devices in the ECM include analog-to-digital
converters, signal buffers, counters, and special drivers.
The ECM controls most components with electronic
switches which complete a ground circuit when turned
ON.
Aftermarket Electrical and Vacuum Equipment
Aftermarket or add-on electrical and vacuum equipment
is defined as any equipment which connects to the
vehicle's electrical or vacuum systems that is installed
on a vehicle after the vehicle leaves the factory. No
allowances have been made in the vehicle design fo
r
this type of equipment. No add-on vacuum equipment
should be added to this vehicle. Add-on electrical
equipment must only be connected to the vehicle's
electrical system at the battery power and ground. Add-
on electrical equipment, even when installed to these
guidelines, may still cause the powertrain system to
malfunction. This may also include equipment not
connected to the vehicle electrical system such as
portable telephones and audios. Therefore, the first
step in diagnosing any powertrain fault is to eliminate all
aftermarket electrical equipment from the vehicle. Afte
r
this is done, if the fault still exists, the fault may be
diagnosed in the normal manner.
Electrostatic Discharge Damage
Electronic components used in the ECM are often
designed to carry very low voltage. Electronic
components are susceptible to damage caused b
y
electrostatic discharge. By comparison, as much as
4,000 volts may be needed for a person to feel even the
zap of a static discharge. There are several ways for a
person to become statically charged. The most
common methods of charging are by friction and
induction. •
An example of charging by friction is a person
sliding across a vehicle seat.


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ISUZU KB P190 2007

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-11
Power Distribution (2)
RTW76EXF003701
C-108
5
WHT
3
WHT/
BLK
5
WHT
3
WHT/
BLK
3BLU
3BLK/RED
3
WHT/
BLK
3
BLK/
YEL 3
BLK/
WHT B-62
B-63
2
4
B-62
B-63 1
1
3
C-18
Rr
Def.
20A C-21
Door
lock
20A C-19
Meter
(+B)
10A C-15
Stop
lamp
15A C-22
Anti
theft
10A C-13
Audio
(+B)
15A
C-16
RR
Fog
10A C-17
Room
10A C-20
Power
window
30A Fuse/
relay box
(Cabin)
C-14
Meter
10A C-8
SRS
10AC-7
TCM
10A
or
15A C-9
Front
wiper
20A C-10
Back
up
15A C-6
Engine
10A
C-5
ABS/4WD
10AC-1
Starter
10AC-2
Trailer
10AC-3
ELEC IG
10A C-4
Turn
10AC-12
Cigar
lighter
&
ACC
Socket
20A C-11
Audio
10A
SBF9
IG2
60A Fuse/
relay
box
(Engine
room)
Starter relay
SBF5
IG1
40A
1
2
3 B-62 B1
B2
OFF
ACC
IG2ST
IG1 Ignition
switch

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6E-354 ENGINE CONTROL SYSTEM (4JK1/4JJ1)
ECM Input & Output
ECM Voltage Description
The ECM supplies a buffered voltage to various
switches and sensors. The ECM can do this because
resistance in the ECM is so high in value that a test
lamp may not illuminate when connected to the circuit.
An ordinary shop voltmeter may not give an accurate
reading because the voltmeter input impedance is too
low. Use a 10-megaohm input impedance DMM, to
ensure accurate voltage readings. The input and/ or
output devices in the ECM include analog-to-digital
converters, signal buffers, counters, and special
drivers. The ECM controls most components with
electronic switches which complete a ground circuit
when turned ON. Aftermarket Electrical and Vacuum Equipment
Aftermarket or add-on electrical and vacuum
equipment is defined as any equipment which connects
to the vehicle's electrical or vacuum systems that is
installed on a vehicle after the vehicle leaves the
factory. No allowances have been made in the vehicle
design for this type of equipment. No add-on vacuum
equipment should be added to this vehicle. Add-on
electrical equipment must only be connected to the
vehicle's electrical system at the battery power and
ground. Add-on electrical equipment, even when
installed to these guidelines, may still cause the
powertrain system to malfunction. This may also
include equipment not connected to the vehicle
electrical system such as portable telephones and
audios. Therefore, the first step in diagnosing any
powertrain fault is to eliminate all aftermarket electrical
equipment from the vehicle. After this is done, if the
fault still exists, the fault may be diagnosed in the
normal manner.
RTW76EMF000501
Sensor inputs
· Intake air temperature (IAT) sensor
· Mass air flow (MAF) sensor
· Engine coolant temperature (ECT) sensor
· Fuel temperature (FT) sensor
· Barometric pressure (BARO) sensor
· Boost pressure sensor (High output engine)
· Accelerator pedal position (APP) sensor
· EGR position sensor
· Intake throttle position sensor
· Crankshaft position (CKP) sensor
· Camshaft position (CMP) sensor
· Fuel rail pressure (FRP) sensor
· Vehicle speed sensor (VSS)
Switch input
· Ignition switch (ON/start position)
· Clutch switch (M/T)
· Brake switch
· Neutral switch
· Cruise main switch
· Cruise cancel switch
· Cruise resume/ accel. switch
· Cruise set/ cast switch
· Fuel filter switch
· A/C switch
· Diagnostic request switch
Fuel injection control
· Fuel rail pressure (FRP) regulator
· Fuel injector #1
· Fuel injector #2
· Fuel injector #3
· Fuel injector #4
Relay control outputs
· Glow relay
· Fuel pump relay
· Starter cut relay
· A/C compressor relay
Lamp control
· Malfunction indicator lamp (MIL)
· Service vehicle soon (SVS) lamp
· Glow indicator lamp
· Fuel filter lamp
Communication
· Controller area network (CAN)
Actuator control
· Intake throttle solenoid
· EGR solenoid
· Swirl control solenoid
· Turbocharger nozzle control solenoid
(High output engine)ECM

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6E–32 ENGINE DRIVEABILITY AND EMISSIONS
FUSE AND RELAY LOCATION (LHD & RHD)
FUSE
SLOW BLOW FUSE
RELAY No. Capacity Indication on label No. Capacity Indication on label
1— — 1 215A CIGER/ACC
SOCKET
2 10A ABS/4WD 13 15A AUDIO (+B)
3 10A TRAILER 14 20A DOOR LOCK
4 15A BACK UP 15 10A METER (+B)
5 15A METER16 10A ROOM
6 10A TURN17 10A ANTI THEFT
7 15A ELEC.IG 18 15ASTOP
815A ENGINE 19 — —
9 20A FRT WIPER 20 10A STARTER
10 15A EGR (RHD)
IG.COIL (LHD) 21 10A
SRS
11 10A AUDIO
No. Capacity Indication on label 22 20A RR DEF
23 30A POWER WINDOW
Connector No. B-7B-8B-40
C24SE REAR DEFOGGER POWER WINDOW (NO RELAY)
FUSE BOX

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ISUZU KB P190 2007

Powertrain Interface Module – V6 Page 6E1–25

• Thorough inspection of the wiring circuits and connectors listed in the diagnostic procedures must be performed,
otherwise misdiagnosis may occur.
• Inspect the electrical circuitry or connector terminals that are suspected to be causing the complaint for the
following conditions:
• backed-out connector terminals,
• improper wiring connector mating,
• broken wiring connector locks,
• damaged connector terminals, and
• physical damage to the wiring harness.
• Before replacing a component, inspect its connector terminal for corrosion or deformation that may cause the fault
condition.
Preliminary Checks
The PIM preliminary check examines easily accessible components which may cause problems with the PIM. This visual
and physical inspection procedure may quickly identify the fault condition and eliminate the need for additional diagnosis.
• Refer to Service Techlines for relevant information regarding the fault condition.
• Ensure the battery is fully charged.
• Check the battery connections for corrosion or a loose terminal.
• Perform a visual and physical inspection of the following:
• PIM component wiring harness and terminals for proper connections, pinches or cuts, and
• PIM wiring harness routing which may be positioned very close to a high voltage or high current devices such
as aftermarket audio systems.
NOTE
High voltage or high current devices may induce
electrical noise on a circuit, which can interfere
with normal circuit operation.
• The PIM is sensitive to Electro Magnetic Interference (EMI). Check for incorrect aftermarket theft deterrent
devices, lights or mobile phone installations if an intermittent malfunction is suspected.
7.2 Diagnostic System Check
Step Action Yes No
1
Have you met the basic diagnostic requirements listed in the PIM
Diagnostic Starting Point?
Go to Step 2 Refer to
7.1 Diagnostic
Requirements,
Precautions and
Preliminary Checks
2 Have you read the Diagnostic Precautions?
Go to Step 3 Refer to
7.1 Diagnostic Requirements,
Precautions and
Preliminary Checks
3 Have you performed the Preliminary Checks?
Go to Step 4 Refer to
7.1 Diagnostic Requirements,
Precautions and
Preliminary Checks

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ELECTRICAL-BODY AND CHASSIS 8A-3
PAGE
Power Window ............................................................................................................8A- 41 5
Audio, Clock and Cigarette Lighter ...........................................................................8A- 440
Power Door Mirror ......................................................................................................8A- 464
Rear Defogger .............................................................................................................8A- 480
Supplemental Restraint System (SRS)-Air Bag ........................................................8A- 491
Transfer Case Control Module ...................................................................................8A- 498
Anti-Lock Brake System .............................................................................................8A- 514
Immobilizer ..................................................................................................................8 A- 519
Keyless Entry ..............................................................................................................8A- 529
Data Link Connector ...................................................................................................8A- 553
Anti Theft ..................................................................................................................... .8A- 561
Key Inter Lock .............................................................................................................8A- 588
DRM ........................................................................................................................... ...8A- 592
Trailer Hitch ................................................................................................................. 8A- 595
Power Train Interface Module (PIM) ..........................................................................8A- 600
Connector List ................................................................................................................ .8A- 606

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ELECTRICAL-BODY AND CHASSIS 8A-33
FUSE LOCATION


RHD/LHD

FUSE
NO. Capacity Indication on label NO. Capacity Indication on label
C 1 10A STARTER C 1110A AUDIO
C2
  C
12 20A CIGAR/ACC SOCKET
10A TRAILER *3 C 13 15A AUDIO (+B)
C3 10A ELEC IG C 14 10A METER
C4 10A TURN C 15 15A STOP
C5 10A ABS/4WD C 16
 
C6 10A ENGINE C 17 10A ROOM
10A ECU *4 C19 10A METER (+B)
C7 15A TCM/IG COIL/ C2 120A DOOR LOCK
10A GLOW ENGINE *4 C22
 
C8 10A SRS 10A ANTI THEFT *5
C9 20A FRT WIPER
C10 15A BACKUP

SLOW BLOW FUSE
NO. Capacity Indication on label
C 18 20A RR DEF
C20 30A POWER WINDOW

FUSE BOX
*3 … HFV6 (AUSTRALIA)
*4 … HFV6
*5 … 4JJ 1-TC (EUROPE)



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8A-440 ELECTRICAL-BODY AND CHASSIS
AUDIO, CLOCK AND CIGARETTE LIGHTER
PARTS LOCATION (RHD)







RTW 78AXF039701 & RTW 78AXF045901

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