Isuzu N-Series. Manual - part 662

 

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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

 

 

 

 

 

 

 

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