Isuzu N-Series. Service manual — part 743
Engine Control System (4JH1) 6E-23
Exhaust Brake Solenoid Valve
Fuel Injection Pump Control Unit (PCU)
3
BLU/RED
Engine Warm Up Switch 12V
Feed
4
BRN/RED
Indicator Lamp Voltage Feed
From Switch Signal
5
BLK
Illumination Lamp Ground
6
BRN/RED
Engine Warm Up Switch Signal
Connector No.
J-31
Connector Color
Black
Test Adapter No.
J-35616-33
Pin
Wire Color
Pin Function
1
BLK
Ignition Voltage
2
LT GRN
Exhaust Brake Solenoid Control
Connector No.
B-31
Connector Color
Gray
Test Adapter No.
J-35616-42
Pin
Wire Color
Pin Function
1
2
N6A3807E
Connector No.
E-110
Connector Color
Black
Test Adapter No.
J-35616-8
Pin
Wire Color
Pin Function
1
BLU
CAN Low Signal
2
YEL
CAN High Signal
3
—
Not Used
4
—
Not Used
5
ORN
Engine Shutoff (ESO) Solenoid
Valve Control Signal Input
6
BLK
Ground
7
RED/WHT
Battery voltage
8
PNK
CKP Sensor Signal Input
9
—
Not Used
2
3
4
5
6
1
9
8
7
N6A3808E
6E-24 Engine Control System (4JH1)
Glow Plug
Idle Switch
Intake Throttle Solenoid Valve
Mass Air Flow (MAF) / Intake Air Temperature
Sensor
Connector No.
J-122
Connector Color
Silver
Pin
Wire Color
Pin Function
1
BLK/YEL
Power Supply
Connector No.
B-340
Connector Color
Black
Test Adapter No.
J-35616
Pin
Wire Color
Pin Function
1
GRN/BLK
Idle Switch Signal
2
BLK
Idle Switch Ground
N6A3809E
1 2
N6A3810E
Connector No.
J-40
Connector Color
Brown
Test Adapter No.
J-35616-4A
Pin
Wire Color
Pin Function
1
BLU/RED
Ignition Voltage
2
LT GRN/
WHT
Intake Throttle Solenoid Control
Connector No.
J-182
Connector Color
Black
Test Adapter No.
J-35616-4A
Pin
Wire Color
Pin Function
1
BLK/BLU
IAT Sensor Signal
1
2
N6A3811E
1
2
3
4
5
N6A3812E
Engine Control System (4JH1) 6E-25
Vehicle Speed Sensor (VSS)
2
BLU/RED
MAF Sensor Ignition Voltage
Feed
3
BLK/RED
MAF Sensor & IAT Sensor Low
Reference
4
WHT/RED
MAF Sensor 5 Volts Reference
5
GRN/RED
MAF Sensor Signal
Connector No.
J-32
Connector Color
Gray
Test Adapter No.
J-35616-64A
Pin
Wire Color
Pin Function
1
BLK/YEL
VSS 12 Volts Feed
2
BLK
VSS Low Reference
3
YEL/GRN
VSS Signal
Connector No.
J-182
Connector Color
Black
Test Adapter No.
J-35616-4A
Pin
Wire Color
Pin Function
1
2
3
N6A3813E
6E-26 Engine Control System (4JH1)
Diagnostic Information and Procedures
General Service Information
Non-OEM Parts
All of the on-board diagnostic (OBD) has been
calibrated to run with original equipment manufacturer
(OEM) parts. Accordingly, if commercially sold sensor
or switch is installed, it makes a wrong diagnosis and
turn on the malfunction indicator lamp (MIL).
Aftermarket electronics, such as cellular phones,
stereos, and anti-theft devices, may indicate
electromagnetic interference (EMI) into the control
system if they are improperly installed. This may cause
a false sensor reading and turn on the MIL.
Poor Vehicle Maintenance
The sensitivity of OBD will cause the MIL turn on if the
vehicle is not maintained properly. Restricted oil filters,
fuel filters, and crankcase deposits due to lack of oil
changes or improper oil viscosity can trigger actual
vehicle faults that were not previously monitored prior
to OBD. Poor vehicle maintenance cannot be
classified as a “non-vehicle fault”, but with the
sensitivity of OBD diagnostics, vehicle maintenance
schedules must be more closely followed.
Visual/Physical Engine Compartment Inspection
Perform a careful visual and physical engine
compartment inspection when performing any
diagnostic procedure or diagnosing the cause of an
emission test failure. This can often lead to repairing a
problem without further steps. Use the following
guidelines when performing a visual/physical
inspection:
• Inspect all vacuum hoses for punches, cuts,
disconnects, and correct routing.
• Inspect hoses that are difficult to see behind other
components.
• Inspect all wires in the engine compartment for
proper connections, burned or chafed spots,
pinched wires, contact with sharp edges or contact
with hot exhaust manifolds or pipes.
Basic Knowledge of Tools Required
Lack of basic knowledge of this powertrain when
performing diagnostic procedures could result in an
incorrect diagnosis or damage to powertrain
components. Do not attempt to diagnose a powertrain
problem without this basic knowledge. A basic
understanding of hand tools is necessary to effectively
use this section of the manual.
Malfunction Indicator Lamp (MIL)
Basically, the MIL is turned on when the ECM detects a
DTC that will impact the vehicle emissions. When the
MIL remains “ON” while the engine is running, or when
a malfunction is suspected due to a driveability or
emissions problem, a Diagnostic System Check must
be performed. The procedures for these checks are
given in Diagnostic System Check – Engine Controls.
DTC Types
Characteristic of Code
• Non-Emissions related
• Dose not request illumination of any lamp
• Stores a DTC on the first trip with a fail
Reading Flash Diagnostic Trouble Codes
The provision for communicating with the ECM is the
Data Link Connector (DLC). The DTCs stored in the
ECM memory can be read either through a hand-held
diagnostic scanner such as Tech 2 plugged into the
DLC or by counting the number of flashes of the MIL
when the diagnostic test terminal of the DLC is
grounded. The DLC terminal “6” (diagnostic request
switch) is pulled “Low” (grounded) by jumped to DLC
terminal “4”, which is a ground wire.
Once terminals “4” and “6” have been connected, the
ignition switch must be moved to the “ON” position, with
the engine not running. The MIL will initially flash 12.
Then, the MIL will flash the first stored DTC three
times, second stored DTC three times and so on. All
the stored DTCs are flashed, then return 12 and
continue to flash the DTC. If no DTC exists, the MIL
flashes 12 continuously. The flash DTC display will
continue as long as the DLC is shorted.
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