Isuzu N-Series. Service manual — part 657
6E-50 Engine Control System (4HK1)
Breaker Box Connection Type B
Legend
1. Engine Control Module (ECM)
2. Adapter Harness
3. ECM – Harness Connector
4. Breaker Box
5. ECM connected
The ECM and other connectors have water proof
terminal that is not allowed to back probe. Breaker Box
Connection Type B is suitable usage to test short to
voltage circuit or signal check between the ECM and
electrical components.
CAUTION
To avoid electric shock;
Set the key switch to the "OFF" or "LOCK"
position before checking or repairing the
computer, wiring or/and connectors.
1
2
4
5
3
N6A6475E
Engine Control System (4HK1) 6E-51
Engine Control System Check Sheet
ENGINE CONTROL SYSTEM CHECK SHEET
Inspectors Name
Customer’s Name
Model & Model Year
Driver’s Name
Chassis No.
Date Vehicle Brought In
Engine No.
License No.
Odometer Reading
Km/miles
Engine Does
Not Run
Engine does not crank
No initial combustion
No complete combustion
Hard Start
Engine cranks slowly
Other (
)
Abnormal idling speed
High idling speed ( RPM)
Low idling speed ( RPM)
Rough idling
Incorrect Idle
Other (
)
Hesitation, sag, stumble
Surge, chuggles
Cut out, misses
Lack of power, sluggishness, sponginess
Poor
Driveability
Other (
)
Soon after starting
After accelerator pedal depressed
Engine Stall
During A/C operation
After accelerator pedal released
Shifting from N to D
Other (
)
Black smoke
White smoke
Poor fuel economy
Fuel knock, combustion noise
P
robl
em
S
y
m
p
to
m
s
Others
Other (
)
Dates problem occurred
Constant
Intermittently ( times per day/month)
Once only
Problem frequency
Other (
)
Fine
Cloudy
Rainy
Snow
Weather
Various/Other (
)
Hot (approx. )
Warm
Cool
Cold (approx. )
Outside
Temperature
Any temperature
Highway
Suburbs
City area
Uphill
Place
Downhill
Rough road
Other (
)
Over (approx.
tons)
No load
Load Condition
Other (approx.
tons)
Cold
Warming up
After warming up
Any temperature
Engine
Temperature
Other (
)
Starting
Just after starting (
Min.)
Idling
Racing
Driving
Constant speed
Acceleration
Deceleration
A/C switch On/Off
Engine Operation
Other (
)
Fuel Amount
Full
Above 1/2
Below 1/2
Near empty
Condi
ti
on When
P
robl
em
O
c
c
u
rs
Fuel Bland
Condition of MIL
Remains On
Intermittently turns On
Does not turn On
Present Code
Nothing
P or U Code
No. (
)
Diagnostic Trouble
Code (DTC) or Flash
Code
History Code
Nothing
P or U Code
Code No. (
)
Other Additional
Condition
N6A6476E
6E-52 Engine Control System (4HK1)
Diagnostic Starting Point – Engine
Controls
Begin the system diagnosis with Diagnostic System
Check – Engine Controls. The Diagnostic System
Check – Engine Controls will provide the following
information:
• The identification of the control modules which
command the system.
• The ability of the control modules to communicate
through the serial data circuit.
• The identification of any stored diagnostic trouble
codes (DTCs) and the their statuses.
The use of the Diagnostic System Check – Engine
Controls will identify the correct procedure for
diagnosing the system and where the procedure is
located.
Important:
Engine Control System Check Sheet must be used to
verify the customer complaint, you need to know the
correct (normal) operating behavior of the system and
verify that the customer complaint is a valid failure of
the system.
Diagnostic System Check – Engine
Controls
Description
The Diagnostic System Check – Engine Controls is an
organized approach to identifying a condition that is
created by a malfunction in the electronic engine
control system. The Diagnostic System Check must be
the starting point for any driveability concern. The
Diagnostic System Check directs the service technician
to the next logical step in order to diagnose the
concern. Understanding and correctly using the
diagnostic table reduces diagnostic time, and prevents
the replacement of good parts.
Test Description
The numbers below refer to the step numbers on the
diagnostic table.
1. Lack of communication may be because of a partial
or a total malfunction of the Keyword 2000 serial data
circuit. The specified procedure determines the
particular condition.
4. The presence of DTCs which begin with U, indicate
that some other module is not communicating.
10. If there are other modules with DTCs set, refer to
the DTC list. The DTC list directs you to the appropriate
diagnostic procedure. If the control module stores
multiple DTCs, diagnose the DTCs in the following
order.
• Component level DTCs, such as sensor DTCs,
solenoid DTCs, actuator DTCs, and relay DTCs.
Diagnose the multiple DTCs within this category in
numerical order. Begin with the lowest numbered
DTC, unless the diagnostic table directs you
otherwise.
Diagnostic System Check – Engine Controls
Important:
• DO NOT perform this diagnostic if there is not a
driveability concern, unless another procedure
directs you to this diagnostic.
• Before you proceed with diagnosis, search for
applicable service bulletins.
• Unless a diagnostic procedure instructs you, DO
NOT clear the DTCs.
• If there is a condition with the starting system, refer
to the starting system section in the engine
mechanical.
• Ensure the battery has a full charge.
• Ensure the battery cables (+) (
−) are clean and
tight.
• Ensure the ECM grounds are clean, tight, and in
the correct location.
• Ensure the ECM harness connectors are clean
and correctly connected.
• Ensure the ECM terminals are clean and correctly
mating.
• Ensure the vehicle maintenance has been done
enough.
• Ensure the Fuel Injector ID Code Data is correctly
programmed.
• If there are fuel system DTC’s (P0087, P0088,
P0089, P1093, P1094 or P1095), diagnose sensor
DTCs, solenoid DTCs, actuator DTCs and relay
DTCs FIRST.
Engine Control System (4HK1) 6E-53
Step
Action
Value(s)
Yes
No
1
1.
Install the Tech 2.
2.
Turn ON the ignition, with the engine OFF.
3.
Attempt to establish communication with the
listed control modules.
• Engine control module (ECM)
• Transmission control module (TCM)
(Smoother only)
• Hill start aid (HSA) control module (If so
equipped)
• Supplemental restraint system (SRS)
control module (If so equipped)
Does the Tech 2 communicate with all the listed
control modules?
—
Go to Step 2
Go to Tech 2 Does
Not Communicate
with Keyword
Device
2
Attempt to start the engine.
Does the engine start and idle?
—
Go to Step 3
Go to Engine
Cranks but Does
Not Run
3
Select the DTC display function for the following
control modules:
• ECM
• TCM (Smoother only)
• HSA control module (If so equipped)
• SRS control module (If so equipped)
Does the Tech 2 display any DTCs?
—
Go to Step 4
Go to Step 11
4
Does the Tech 2 display DTCs which begin with a U
or other control module communication fault
DTCs?
—
Go to Applicable
DTC
Go to Step 5
5
Does the Tech 2 display ECM DTCs P0601, P0603,
P0606, P0611, P0612 or P1630?
—
Go to Applicable
DTC
Go to Step 6
6
Does the Tech 2 display ECM DTC P1625?
—
Go to Applicable
DTC
Go to Step 7
7
Does the Tech 2 display ECM DTCs P1631, P1632,
P1633, P1634 or P1635?
—
Go to Applicable
DTC
Go to Step 8
8
Does the Tech 2 display ECM DTCs P0219, P0335,
P0336, P0340, P0341 or P1345?
—
Go to Applicable
DTC
Go to Step 9
9
Does the Tech 2 display ECM DTCs P0090, P0201,
P0202, P0203, P0204, P1261 or P1262?
—
Go to Applicable
DTC
Go to Step 10
10
Is there any other code in any controller that has
not been diagnosed?
—
Go to Applicable
DTC
Go to Step 11
11
Is the customer’s concern with the transmission?
—
Go to Diagnostic
System Check –
Transmission
Controls
Go to Step 12
12
Is the customer’s concern with the HSA system?
—
Go to Diagnostic
System Check –
HSA Controls
Go to Step 13
13
Is the customer’s concern with the SRS airbag
system?
—
Go to Diagnostic
System Check –
SRS Controls
Go to Step 14
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