Isuzu N-Series. Manual — part 654
6E-38 Engine Control System (4HK1)
Fuel Rail Pressure (FRP) Regulator
Fuel Rail Pressure (FRP) Sensor
Fuel Temperature (FT) Sensor
Glow Plug
Connector No.
E-116
Connector Color
Gray
Test Adapter No.
J-35616-33
Pin
Wire Color
Pin Function
1
WHT/RED
FRP Regulator High Control
2
GRN/RED
FRP Regulator Low Control
Connector No.
E-113
Connector Color
Black
Test Adapter No.
J-35616-64A
Pin
Wire Color
Pin Function
1
BRN
FRP Sensor Low Reference
2
WHT
FRP Sensor Signal
1
2
N6A6455E
N6A6555E
3
GRN/BLU
FRP Sensor 5 Volts Reference
Connector No.
E-93
Connector Color
Green
Test Adapter No.
J-35616-64A
Pin
Wire Color
Pin Function
1
BLK
FT Sensor Low Reference
2
LT GRN/
WHT
FT Sensor Signal
Connector No.
E-113
Connector Color
Black
Test Adapter No.
J-35616-64A
Pin
Wire Color
Pin Function
N6A6556E
N6A3809E
Engine Control System (4HK1) 6E-39
Idle Up Sensor
Intake Air Temperature (IAT) Sensor
Intake Throttle Solenoid Valve
Connector No.
E-3
Connector Color
Silver
Pin
Wire Color
Pin Function
1
BLK/YEL
Power Supply
Connector No.
B-281
Connector Color
White
Test Adapter No.
J-35616-33
Pin
Wire Color
Pin Function
1
BLU/RED
Idle Up Sensor Low Reference
2
BLU/YEL
Idle Up Sensor Signal
3
BLU
Idle Up Sensor 5 Volts
Reference
1
2
3
N6A6467E
1 2
N6A6468E
Connector No.
J-190
Connector Color
Gray
Test Adapter No.
J-35616-16
Pin
Wire Color
Pin Function
1
RED/GRN
IAT Sensor Signal
2
BLK
IAT Sensor Low Reference
Connector No.
J-40
Connector Color
Black
Test Adapter No.
J-35616-4A
Pin
Wire Color
Pin Function
1
LT GRN
Intake Throttle Solenoid Valve
Voltage Feed
2
LT GRN/
WHT
Intake Throttle Solenoid Valve
Control
1 2
N6A6469E
6E-40 Engine Control System (4HK1)
PTO Switch
PTO Throttle Sensor
Vehicle Speed Sensor (VSS)
Connector No.
B-84
Connector Color
White
Test Adapter No.
J-35616-33
Pin
Wire Color
Pin Function
1
BLU/ORG
PTO Switch Signal
2
BLK
PTO Switch Ground
Connector No.
J-166
Connector Color
White
Test Adapter No.
J-35616-33
Pin
Wire Color
Pin Function
1
RED
PTO Throttle Sensor 5 Volts
Reference
2
BRN
PTO Throttle Sensor Signal
1 2
N6A6470E
1
2
3
N6A6643E
3
PNK/BLK
PTO Throttle Sensor Low
Reference
Connector No.
J-32
Connector Color
Gray
Test Adapter No.
J-35616-33
Pin
Wire Color
Pin Function
1
BLK/YEL
VSS Ignition Voltage
2
BLK
VSS Low Reference
3
YEL/GRN
VSS Signal
Connector No.
J-166
Connector Color
White
Test Adapter No.
J-35616-33
Pin
Wire Color
Pin Function
1
2
3
N6A3813E
Engine Control System (4HK1) 6E-41
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 service manual.
Malfunction Indicator Lamp (MIL)
Basically, the MIL is turned on when the ECM detects a
DTC that will impact the vehicle emission or
performance. 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
• Stores a DTC on the first trip with a fail
• Dose not request illumination of any lamp
Reading Flash Diagnostic Trouble Codes (DTC)
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 “1” (diagnostic request) is
pulled “Low” (grounded) by jumped to DLC terminal “4”,
which is a ground wire. Once terminals “1” and “4” have
been connected, the ignition switch must be moved to
the “ON” position, with the engine not running. The MIL
will indicate a DTC three times is a DTC is present and
history. If more than one DTC has been stored in the
ECM’s memory, the DTCs will be output numerical
order with each DTC being displayed three times. The
flash DTC display will continue as long as the DLC is
shorted.
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