Isuzu N-Series. Manual — part 748
Engine Control System (4JH1) 6E-43
Diagnostic Trouble Code (DTC) List
DTC
(Symptom
Code)
Flash
Code
MIL
Status
DTC Name on
Tech 2
Condition for Running
the DTC
Condition for Setting
the DTC
Possible Cause
P0100
(7)
65
ON
Mass Air Flow
(MAF) Sensor
Circuit 5V
Reference High
Voltage
• The ignition switch
is ON.
• The ECM detects
that the MAF
sensor 5 volts
reference circuit
voltage is more
than 5.2 volts for
0.5 seconds.
• Sensor 5V reference
circuit is short to battery
or ignition voltage.
• Sensor 5V reference
circuit is short to the
sensor ignition voltage
circuit.
• Faulty MAF sensor.
• Faulty ECM.
P0100
(9)
65
ON
Mass Air Flow
(MAF) Sensor
Voltage 5V
Reference
Circuit Low
Voltage
• The ignition switch
is ON.
• The ECM detects
that the MAF
sensor 5 volts
reference circuit
voltage is less than
4.6 volts for 0.5
seconds.
• Sensor 5V reference
circuit is short to ground.
• Sensor 5V reference
circuit is short to the low
reference circuit.
• Faulty MAF sensor.
• Faulty ECM.
P0100
(B)
65
ON
Mass Air Flow
(MAF) Sensor
Circuit Low
Voltage
• The ignition switch
is ON.
• The engine is
running.
• The ECM
calculated MAF is
lower than -18.6
kg/h for 5 seconds.
• Sensor ignition voltage
feed circuit is open
circuit or high resistance.
• Sensor 5V reference
circuit is open circuit,
high resistance, short to
ground or short to the
low reference circuit.
• Sensor signal circuit is
open circuit, high
resistance, short to
ground or short to the
low reference circuit.
• Poor harness connector
connection.
• Faulty MAF sensor
installation.
• Faulty MAF sensor.
• Faulty ECM.
P0100
(C)
65
ON
Mass Air Flow
(MAF) Sensor
Circuit High
Voltage
• The ignition switch
is ON.
• The engine is
running.
• The ECM
calculated MAF is
higher than 806 kg/
h for 10 seconds.
• Sensor signal circuit is
short to any 5V
reference circuit, short to
battery or ignition voltage
circuit.
• Sensor low reference
circuit is open circuit or
high resistance.
• Poor harness connector
connection.
• Faulty MAF sensor.
• Faulty ECM.
6E-44 Engine Control System (4JH1)
P0110
(1)
23
ON
Intake Air
Temperature
(IAT) Sensor
Circuit High
Voltage
• The ignition switch
is ON.
• The ECM detects
that the IAT sensor
signal voltage is
more than 4.7 volts
for 3 seconds.
• Sensor signal circuit is
open circuit, high
resistance, short to any
5V reference circuit,
short to battery or
ignition voltage.
• Sensor low reference
circuit is open circuit or
high resistance.
• Poor harness connector
connection.
• Faulty IAT sensor.
• Faulty ECM.
P0110
(2)
23
ON
Intake Air
Temperature
(IAT) Sensor
Circuit Low
Voltage
• The ignition switch
is ON.
• The ECM detects
that the IAT sensor
signal voltage is
less than 0.3 volts
for 3 seconds.
• Sensor signal circuit is
short to ground or short
to the low reference
circuit.
• Faulty IAT sensor.
• Faulty ECM.
P0115
(1)
14
ON
Engine Coolant
Temperature
(ECT) Sensor
Circuit High
Voltage
• The ignition switch
is ON.
• The ECM detects
that the ECT
sensor signal
voltage is more
than 4.7 volts for 3
seconds.
• Sensor signal circuit is
open circuit, high
resistance, short to any
5V reference circuit,
short to battery or
ignition voltage.
• Sensor low reference
circuit is open circuit or
high resistance.
• Poor harness connector
connection.
• Faulty ECT sensor.
• Faulty ECM.
P0115
(2)
14
ON
Engine Coolant
Temperature
(ECT) Sensor
Circuit Low
Voltage
• The ignition switch
is ON.
• The ECM detects
that the ECT
sensor signal
voltage is less than
0.3 volts for 3
seconds.
• Sensor signal circuit is
short to ground or short
to the low reference
circuit.
• Faulty ECT sensor.
• Faulty ECM.
P0180
(B)
15
ON
Fuel
Temperature
Sensor Circuit
• The ignition switch
is ON.
• The PCU internal
FT sensor output is
lower than -40
°C (-
40
°F) for 3
seconds or higher
than 150
°C
(302
°F) for 3
seconds.
• Faulty PCU.
DTC
(Symptom
Code)
Flash
Code
MIL
Status
DTC Name on
Tech 2
Condition for Running
the DTC
Condition for Setting
the DTC
Possible Cause
Engine Control System (4JH1) 6E-45
P0215
(A)
52
ON at
next
igni-
tion
cycle
Engine Shutoff
(ESO) Solenoid
Control Circuit
• The ignition switch
is OFF.
• The engine speed
is lower than 1500
RPM.
• The vehicle speed
is lower than 1.5
km/h (1 MPH).
• After the condition
for running the
DTC for 2 seconds,
the engine speed
is higher than 200
RPM when the
ESO solenoid
valve is
commanded
shutoff from the
PCU.
• Faulty fuel injection
pump.
P0215
(B)
52
ON
Engine Shutoff
(ESO) Solenoid
Control Circuit
• The ignition switch
is ON.
• The PCU detects
high voltage
condition on the
ESO solenoid
valve control circuit
for longer than 1
second when the
ECM does not
command shutoff.
• ESO solenoid valve
control circuit is short to
battery or ignition
voltage.
• Faulty PCU.
• Faulty ECM.
P0215
(C)
52
ON
Engine Shutoff
(ESO) Solenoid
Control Circuit
• The ignition switch
is OFF.
• The engine speed
is lower than 1500
RPM.
• The vehicle speed
is lower than 1.5
km/h (1 MPH).
• The engine speed
is higher than 200
RPM within 2
seconds after the
condition for
running the DTC
are met.
• ESO solenoid valve
control circuit is open
circuit, high resistance or
short to ground.
• Faulty PCU.
• Faulty ECM.
P0215
(D)
52
ON
Engine Shutoff
(ESO) Solenoid
Control Circuit
• The ignition switch
is OFF.
• The ECM detects
internal CAN
controller does not
Bus OFF mode.
• Faulty ECM.
P0216
(A)
54
ON
Injection Timing
Control Circuit
• The engine speed
is higher than 700
RPM.
• The fuel injection
quantity is higher
than 4 mg/strk.
• The PCU
monitored actual
fuel injection timing
is advanced more
than desired by
3
°CA for longer
than 12 seconds or
retarded more than
desired by 6
°CA
for longer than 12
seconds.
• Excessive air in the fuel
system.
• Loss fuel.
• Fuel suction side
looseness, kinks or
blocked.
• Faulty or clogged fuel
filter.
• Contaminated fuel.
• Faulty timing device.
• Faulty fuel injection
pump CMP sensor.
DTC
(Symptom
Code)
Flash
Code
MIL
Status
DTC Name on
Tech 2
Condition for Running
the DTC
Condition for Setting
the DTC
Possible Cause
6E-46 Engine Control System (4JH1)
P0216
(B)
54
ON
Injection Timing
Control Circuit
• The engine speed
is higher than 2014
RPM.
• The PCU
monitored actual
fuel injection timing
is oscillated higher
than desired by
5.2
°CA.
• Excessive air in the fuel
system.
• Loss fuel.
• Fuel suction side
looseness, kinks or
blocked.
• Faulty or clogged fuel
filter.
• Contaminated fuel.
• Faulty timing device.
• Faulty fuel injection
pump CMP sensor.
P0251
(6)
53
ON
Injection Pump
Fuel Metering
Control
• The fuel injection
pump CMP sensor
signal is
generated.
• The CAN
communication
between the ECM
and PCU is
normal.
• The PCU detects
that the fuel
injection solenoid
valve is operated
when the desired
fuel injection
quantity is
commanded 0 mg/
strk.
• Faulty fuel injection
pump.
• Faulty PCU.
P0251
(7)
53
ON
Injection Pump
Fuel Metering
Control
• The fuel injection
pump CMP sensor
signal is
generated.
• The CKP sensor
signal is
generated.
• The engine speed
is higher than 500
RPM.
• The PCU detects
that the doubled
fuel injection pump
speed is lower than
engine speed by
800 RPM for
longer than 0.2
seconds.
• Faulty CKP sensor
signal.
• Faulty fuel injection
pump CMP sensor
signal.
• Electrical interference.
• Magnetic interference.
• Faulty PCU.
P0251
(9)
53
ON
Injection Pump
Fuel Metering
Control
• The ignition switch
is ON.
• The PCU detects
internal fuel
injection pump
control maps are
not programmed
during self-test.
• Faulty PCU.
P0251
(A)
53
ON
Injection Pump
Fuel Metering
Control
• The ignition switch
is ON.
• The PCU detects
internal EEPROM
or A/D converter is
failed during self-
test.
• Faulty PCU.
P0251
(B)
53
ON
Injection Pump
Fuel Metering
Control
• The ignition switch
is ON.
• The PCU detects
that the fuel
injection solenoid
valve drive circuit
is failed during self-
test.
• Faulty fuel injection
pump.
• Faulty PCU.
P0251
(D)
53
ON
Injection Pump
Fuel Metering
Control
• The ignition switch
is ON.
• The PCU detects
that the fuel
injection solenoid
valve drive circuit
voltage level is
abnormal during
self-test.
• Faulty fuel injection
pump.
• Faulty PCU.
DTC
(Symptom
Code)
Flash
Code
MIL
Status
DTC Name on
Tech 2
Condition for Running
the DTC
Condition for Setting
the DTC
Possible Cause
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