Isuzu N-Series. Service 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