Isuzu N-Series. Manual — part 664
6E-78 Engine Control System (4HK1)
P1093
227
ON
Fuel Rail
Pressure (FRP)
Too Low
• DTCs P0090,
P0192, P0193,
P0201 – P0204,
P0611, P0612,
P1095, P1261,
P1262, P1630 and
P1635 are not set.
• The ignition switch is
ON.
• The ignition voltage
is more than 18
volts.
• The FRP regulator
command is less
than 33% or
commanded fuel
supply is more than
a predetermined
value.
Either of following
condition is met:
• The ECM detects
that the differential
fuel rail pressure is -
10 MPa (-1,450 psi)
for longer than 15
seconds when the
engine speed is
between 0 – 900
RPM.
• The ECM detects
that the deferential
fuel rail pressure is -
15 MPa (-2,170 psi)
for longer than 15
seconds when the
engine speed is
higher than 1200
RPM.
• Loss fuel or less fuel in
the fuel tank.
• Pressure limiter valve
opening pressure drop.
• Faulty fuel injector.
• Fuel suction side
looseness, kinks or
blocked.
• Faulty or clogged fuel
filter.
• FRP sensor circuit is
intermittently open
circuit, poor connection
or corrosion.
• FRP sensor circuit high
resistance.
• FRP regulator circuit is
intermittently open
circuit, poor connection
or corrosion.
• FRP regulator circuit
high resistance.
• Faulty FRP sensor.
• Faulty FRP regulator.
• Faulty fuel supply pump.
DTC
Flash
Code
MIL
Status
DTC Name
Condition for Running
the DTC
Condition for Setting the
DTC
Possible Cause
Engine Control System (4HK1) 6E-79
P1094
226
ON
Fuel Rail
Pressure (FRP)
Too Low
FRP Regulator
Command High DTC
• DTCs P0090,
P0117, P0118,
P0192, P0193,
P0201 – P0204,
P0500, P0501,
P0611, P0612,
P1095, P1261,
P1262, P1630 and
P1635 are not set.
• The ignition switch is
ON.
• The ignition voltage
is more than 18
volts.
• The engine is
running.
• The accelerator
pedal position is 0%.
• The engine coolant
temperature is more
than 50
°C (122°F).
• The vehicle speed is
less than 5 km/h (4
MPH).
• The engine speed
does not vary more
than 50 RPM.
FRP Drop DTC
• DTCs P0090,
P0192, P0193,
P0201 – P0204,
P0611, P0612,
P1095, P1261,
P1262, P1630 and
P1635 are not set.
• The ignition switch is
ON.
• The ignition voltage
is more than 18
volts.
• The engine is
running.
• The accelerator
pedal position is 0%.
• The engine coolant
temperature is more
than 50
°C (122°F).
• The vehicle speed is
more than 50 km/h
(30 MPH).
• The commanded
fuel injection
quantity is OFF.
FRP Regulator
Command High DTC
• The ECM detects
that the FRP
regulator
commanded fuel is
more than a
predetermined
range for longer than
15 seconds when
the engine speed is
between 600 – 1500
RPM.
FRP Drop DTC
• The ECM detects
that the FRP sensor
signal voltage is
shapely dropped
more than 0.2 volts
when the engine
cuts fuel.
• Fuel leaking at high
pressure side.
• Loss fuel or less fuel in
the fuel tank.
• Pressure limiter valve
opening pressure drop.
• Faulty fuel injector.
• Fuel suction side
looseness, kinks or
blocked.
• Faulty or clogged fuel
filter.
• FRP sensor circuit is
intermittently open
circuit, poor connection
or corrosion.
• FRP sensor circuit high
resistance.
• FRP regulator circuit is
intermittently open
circuit, poor connection
or corrosion.
• FRP regulator circuit
high resistance.
• Faulty FRP sensor.
• Faulty FRP regulator.
• Faulty fuel supply pump.
DTC
Flash
Code
MIL
Status
DTC Name
Condition for Running
the DTC
Condition for Setting the
DTC
Possible Cause
6E-80 Engine Control System (4HK1)
P1095
225
ON
Fuel Pressure
Limiter Activation
• DTCs P0192,
P0193, P1630 and
P1635 are not set.
• The ignition switch is
ON.
• The ignition voltage
is more than 18
volts.
• The ECM detects
that the FRP sensor
signal voltage drops
quickly from more
than 3.7 volts to less
than 2.3 volts, and
then the differential
fuel rail pressure is
more than -30 MPa
(4,350 psi).
• Loss fuel or less fuel in
the fuel tank.
• Faulty fuel injector.
• Fuel suction side
looseness, kinks or
blocked.
• Faulty or clogged fuel
filter.
• FRP sensor circuit is
intermittently open
circuit, poor connection
or corrosion.
• FRP sensor circuit high
resistance.
• FRP regulator circuit is
intermittently open
circuit, poor connection
or corrosion.
• FRP regulator circuit
high resistance.
• Faulty FRP sensor.
• Faulty FRP regulator.
• Faulty fuel supply pump.
P1173
542
OFF
Engine Overheat
• DTCs P0117,
P0118, P1630 and
P1634 are not set.
• The ignition switch is
ON.
• The ignition voltage
is more than 18
volts.
• The engine is
running.
• The ECM detects
that the engine
coolant temperature
is more than 110
°C
(230
°F) for 15
seconds.
• Engine overheat.
• Faulty engine cooling
system.
• Faulty engine coolant
temperature sensor.
P1220
28
ON
PTO Engine
Speed Selector
Sensor Circuit
High Voltage
• DTCs P1630 and
P1631 are not set.
• The ignition switch is
ON.
• The ignition voltage
is more than 18
volts.
• The ECM detects
that the PTO throttle
sensor signal
voltage is more than
4.8 volts.
• Sensor 5V reference
circuit is short to battery
or ignition voltage.
(P1631 may also set.)
• Sensor signal circuit is
short to battery, ignition
voltage or short to any
5V reference circuit.
• Sensor low reference
circuit is open circuit or
high resistance.
• Poor harness connector
connection.
• Faulty sensor.
• Faulty ECM.
DTC
Flash
Code
MIL
Status
DTC Name
Condition for Running
the DTC
Condition for Setting the
DTC
Possible Cause
Engine Control System (4HK1) 6E-81
P1225
31
ON
Engine Idle
Speed Selector
Sensor Circuit
• DTCs P1630 and
P1631 are not set.
• The ignition switch is
ON.
• The ignition voltage
is more than 18
volts.
Either of following
condition is met:
• The ECM detects
that the idle up
sensor signal
voltage is less than
0.1 volts for 5
second.
• The ECM detects
that the idle up
sensor signal
voltage is more than
4.9 volts for 5
second.
• Sensor 5V reference
circuit is short to battery
or ignition voltage, short
to ground or short to the
low reference circuit.
(P1631 may also set.)
• Sensor 5V reference
circuit is open circuit,
high resistance.
• Sensor signal circuit is
short to battery, ignition
voltage or short to any
5V reference circuit,
short to ground, short to
the low reference circuit,
open circuit or high
resistance.
• Sensor low reference
circuit is open circuit or
high resistance.
• Poor harness connector
connection.
• Faulty sensor.
• Faulty ECM.
P1261
158
ON
Injector Positive
Voltage Control
Circuit Group 1
• DTC P0611 is not
set.
• The ignition switch is
ON.
• The battery voltage
is more than 18
volts.
• The engine is
running.
Either of following
condition is met:
• The ECM detects
that the common 1
fuel injector drive
circuit is open circuit,
shorted to ground or
shorted to voltage
during engine
rotations.
• The ECM detects
that the cylinder #1
or #4 fuel injector
solenoid coil control
circuit is shorted to
ground during
engine rotations.
• Cylinder #1 or #4 fuel
injector solenoid coil
control circuit is short to
ground.
• Common 1 fuel injector
drive circuit is short to
battery, ignition voltage,
short to ground, open
circuit or high resistance.
• Faulty fuel injector.
• Faulty ECM.
P1262
159
ON
Injector Positive
Voltage Control
Circuit Group 2
• DTC P0612 is not
set.
• The ignition switch is
ON.
• The battery voltage
is more than 18
volts.
• The engine is
running.
Either of following
condition is met:
• The ECM detects
that the common 2
fuel injector drive
circuit is open circuit,
shorted to ground or
shorted to voltage
during engine
rotations.
• The ECM detects
that the cylinder
number 2 or number
3 fuel injector
solenoid coil control
circuit is shorted to
ground during
engine rotations.
• Cylinder #2 or #3 fuel
injector solenoid coil
control circuit is short to
ground.
• Common 2 fuel injector
drive circuit is short to
battery, ignition voltage,
short to ground, open
circuit or high resistance.
• Faulty fuel injector.
• Faulty ECM.
DTC
Flash
Code
MIL
Status
DTC Name
Condition for Running
the DTC
Condition for Setting the
DTC
Possible Cause
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