Isuzu N-Series. Manual — part 662

6E-70 Engine Control System (4HK1)

P0201

271

ON

Injector 1 Control
Circuit

• DTCs P0204, P0611

and P1261 are not
set.

• The ignition switch is

ON.

• The battery voltage

is more than 18
volts.

• The engine is

running.

• The ECM detects

that the cylinder #1
fuel injector solenoid
coil control circuit is
open circuit, shorted
to voltage or shorted
to common 1 fuel
injector drive circuit
during engine
rotations.

• Cylinder #1 fuel injector

solenoid coil control
circuit is open circuit,
high resistance.

• Cylinder #1 fuel injector

solenoid coil control
circuit is short to battery,
ignition voltage or short
to common 1 fuel injector
drive circuit.

• Faulty fuel injector.
• Faulty ECM.

P0202

272

ON

Injector 2 Control
Circuit

• DTCs P0203, P0612

and P1262 are not
set.

• The ignition switch is

ON.

• The battery voltage

is more than 18
volts.

• The engine is

running.

• The ECM detects

that the cylinder #2
fuel injector solenoid
coil control circuit is
open circuit, shorted
to voltage or shorted
to common 2 fuel
injector drive circuit
during engine
rotations.

• Cylinder #2 fuel injector

solenoid coil control
circuit is open circuit,
high resistance.

• Cylinder #2 fuel injector

solenoid coil control
circuit is short to battery,
ignition voltage or short
to common 2 fuel injector
drive circuit.

• Faulty fuel injector.
• Faulty ECM.

P0203

273

ON

Injector 3 Control
Circuit

• DTCs P0202, P0612

and P1262 are not
set.

• The ignition switch is

ON.

• The battery voltage

is more than 18
volts.

• The engine is

running.

• The ECM detects

that the cylinder #3
fuel injector solenoid
coil control circuit is
open circuit, shorted
to voltage or shorted
to common 2 fuel
injector drive circuit
during engine
rotations.

• Cylinder #3 fuel injector

solenoid coil control
circuit is open circuit,
high resistance.

• Cylinder #3 fuel injector

solenoid coil control
circuit is short to battery,
ignition voltage or short
to common 2 fuel injector
drive circuit.

• Faulty fuel injector.
• Faulty ECM.

P0204

274

ON

Injector 4 Control
Circuit

• DTCs P0201, P0611

and P1261 are not
set.

• The ignition switch is

ON.

• The battery voltage

is more than 18
volts.

• The engine is

running.

• The ECM detects

that the cylinder #4
fuel injector solenoid
coil control circuit is
open circuit, shorted
to voltage or shorted
to common 1 fuel
injector drive circuit
during engine
rotations.

• Cylinder #4 fuel injector

solenoid coil control
circuit is open circuit,
high resistance.

• Cylinder #4 fuel injector

solenoid coil control
circuit is short to battery,
ignition voltage or short
to common 1 fuel injector
drive circuit.

• Faulty fuel injector.
• Faulty ECM.

P0219

543

OFF

Engine
Overspeed

• The ignition switch is

ON.

• The ECM detects

that the engine
speed is higher than
4300 RPM.

• Engine over-running.
• Faulty CKP sensor.
• Faulty ECM.
• Electromagnetic

interference and
electrical noise.

DTC

Flash
Code

MIL

Status

DTC Name

Condition for Running

the DTC

Condition for Setting the

DTC

Possible Cause

Engine Control System (4HK1) 6E-71

P0234

42

ON

Turbocharger
Engine
Overboost

• DTCs P0237,

P0238, P1630 and
P1634 are not set.

• The ignition switch is

ON.

• The ignition voltage

is more than 18
volts.

• The engine is

running.

• The fuel injection

quantity is lower
than a
predetermined
value.

• The ECM detects

that the boost
pressure is higher
than 228 kPa (33
psi) for 3 seconds.

• Faulty turbocharger

wastegate valve.

• Faulty boost pressure

sensor.

• Faulty BARO sensor.

P0236

65

ON

Turbocharger
Engine
Underboost

• DTCs P0107,

P0108, P0237,
P0238, P1630 and
P1634 are not set.

• The ignition switch is

ON.

• The ignition voltage

is more than 18
volts.

• The engine is

running.

• The fuel injection

quantity is higher
than a
predetermined
value.

Either of following
condition is met:

• The ECM detects

that the boost
pressure is lower
than 78 kPa (11 psi)
for 20 seconds when
the engine speed is
lower than 900
RPM.

• The ECM detects

that the boost
pressure is lower
than 82 – 151 kPa
(12 – 22 psi) for 20
seconds when the
engine speed is
between 1200 –
3000 RPM.

• The ECM detect that

the boost pressure is
lower than 100 –
158 kPa (15 – 23
psi) for 20 seconds
when the engine
speed is between
3300 – 3600 RPM.

• Air leakage.
• Intake duct is

disconnected.

• Intake system is

obstructed.

• Intake throttle plate

sticking in the closed
position.

• Faulty turbocharger

wastegate valve.

• Faulty turbocharger.

(Shaft stick)

• Faulty boost pressure

sensor.

• Faulty BARO sensor.
• Faulty fuel system. (Low

fuel pressure)

DTC

Flash
Code

MIL

Status

DTC Name

Condition for Running

the DTC

Condition for Setting the

DTC

Possible Cause

6E-72 Engine Control System (4HK1)

P0237

32

ON

Turbocharger
Boost Sensor
Circuit Low
Voltage

• DTCs P1630 and

P1634 are not set.

• The ignition switch is

ON.

• The ignition voltage

is more than 18
volts.

• The ECM detects

that the boost
pressure sensor
signal voltage is less
than 0.1 volts for 5
seconds.

• Sensor 5V reference

circuit is short to ground
or short to the low
reference circuit. (P1634
may also set.)

• Sensor 5V reference

circuit is open circuit,
high resistance.

• Sensor signal circuit is

open circuit, high
resistance, short to
ground or short to the
low reference circuit.

• Poor harness connector

connection.

• Faulty sensor.
• Faulty ECM.

P0238

32

ON

Turbocharger
Boost Sensor
Circuit High
Voltage

• DTCs P1630 and

P1634 are not set.

• The ignition switch is

ON.

• The ignition voltage

is more than 18
volts.

• The ECM detects

that the boost
pressure sensor
signal voltage is
more than 4.9 volts
for 5 seconds.

• Sensor 5V reference

circuit is short to battery
or ignition voltage.
(P1634 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.

P0335

15

ON

Crankshaft
Position (CKP)
Sensor Circuit

• DTCs P0336,

P0340, P0341 and
P1345 are not set.

• The ignition switch is

ON.

• The CMP sensor

signal pulse is
detected.

• The ECM detects

that the CKP sensor
pulses are not
generated during
engine rotations.

• Sensor installation is

poor condition.

• Faulty sensor wheel.
• Sensor high circuit is

short to battery, ignition
voltage, short to any 5V
reference circuit, short to
ground, open circuit or
high resistance.

• Sensor low circuit is

short to battery, ignition
voltage, short to any 5V
reference circuit, short to
ground, open circuit or
high resistance.

• Sensor circuits short to

each other.

• Poor harness connector

connection.

• Faulty sensor.
• Faulty ECM.
• Electromagnetic

interference and
electrical noise.

DTC

Flash
Code

MIL

Status

DTC Name

Condition for Running

the DTC

Condition for Setting the

DTC

Possible Cause

Engine Control System (4HK1) 6E-73

P0336

15

ON

Crankshaft
Position (CKP)
Sensor
Performance

• DTCs P0335,

P0340, P0341 and
P1345 are not set.

• The ignition switch is

ON.

• The CKP sensor

signal is detected.

• The ECM detects

extra or missing
CKP sensor pulses
during engine
rotations.

• Sensor installation is

poor condition.

• Faulty sensor wheel.
• Sensor circuit is

intermittently open circuit
or poor connection.

• Faulty sensor.
• Electromagnetic

interference and
electrical noise.

P0340

14

ON

Camshaft
Position (CMP)
Sensor Circuit

• DTCs P0335,

P0336, P0341 and
P1345 are not set.

• The ignition switch is

ON.

• The crankshaft

position (CKP)
sensor signal pulse
is detected.

• The ECM detects

that the CMP sensor
pulses are not
generated during
engine rotations.

• Sensor installation is

poor condition.

• Faulty sensor wheel.
• Sensor 12V reference

circuit is short to battery,
ignition voltage, short to
any 5V reference circuit,
short to ground, open
circuit or high resistance.

• Sensor signal circuit is

short to battery, ignition
voltage, short to any 5V
reference circuit, short to
ground, open circuit or
high resistance.

• Sensor circuits short to

each other.

• Poor harness connector

connection.

• Faulty sensor.
• Faulty ECM.
• Electromagnetic

interference and
electrical noise.

P0341

14

ON

Camshaft
Position (CMP)
Sensor Circuit
Performance

• DTCs P0335,

P0336, P0340 and
P1345 are not set.

• The ignition switch is

ON.

• The CMP sensor

signal pulse is
detected.

• The ECM detects

extra or missing
CMP sensor pulses
during engine
rotations.

• Sensor installation is

poor condition.

• Faulty sensor wheel.
• Sensor circuit is

intermittently open circuit
or poor connection.

• Faulty sensor.
• Electromagnetic

interference and
electrical noise.

DTC

Flash
Code

MIL

Status

DTC Name

Condition for Running

the DTC

Condition for Setting the

DTC

Possible Cause