Isuzu KB P190. Manual — part 272

6E-54 Engine Control System (4JH1)

DTC

(Symptom

Code)

Flash

Code

MIL

Status

DTC Name on

scan tool

Condition for

Running the DTC

Condition for

Setting the DTC

Possible Cause

P0243

(8)

64 ON

Turbocharger
Waste gate
Solenoid Boost
Solenoid Circuit
High Voltage

• The ignition switch

is ON.

• The ECM detects

that the high
voltage condition on
the turbocharger
solenoid valve
control circuit for
longer than 3
seconds when the
solenoid valve is
commanded ON.

• Turbocharger solenoid valve

control circuit is short to battery
or ignition voltage circuit.

• Faulty turbocharger solenoid

valve.

• Faulty ECM.

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
690 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.

Engine Control System (4JH1) 6E-55

DTC

(Symptom

Code)

Flash

Code

MIL

Status

DTC Name on

scan tool

Condition for

Running the DTC

Condition for

Setting the DTC

Possible Cause

P0251

(E)

53 ON

Injection

Pump

Fuel Metering
Control

• The ignition switch

is ON.

• The ECM detects

communication
message from the
PCU is not received
for longer than 1
second.

• CAN high circuit is open circuit,

high resistance, short to ground,
short to battery or ignition
voltage.

• CAN low circuit is open circuit,

high resistance, short to ground,
short to battery or ignition
voltage.

• Electrical interference.

• Magnetic interference.

• Faulty PCU.

• Faulty ECM.

P0335

(B)

43 ON

Crankshaft
Position (CKP)
Sensor Circuit

• The ignition switch

is ON.

• The engine speed

is higher than 665
RPM.

• The ECM detects

extra or missing
CKP sensor signals
while engine is
running.

• Sensor signal circuit is open

circuit, high resistance, short to
ground, short to battery or short
to ignition voltage.

• Sensor low reference circuit is

open circuit, high resistance,
short to ground, short to battery
or short to ignition voltage.

• Sensor shield ground is open

circuit, high resistance, short to
ground, short to battery or short
to ignition voltage.

• Faulty CKP sensor.

• Faulty ECM.

• Electrical interference.

• Magnetic interference.

• Faulty sensor installation.

• Faulty flywheel circumference.

P0335

(D)

43 ON

Crankshaft
Position (CKP)
Sensor Circuit

• DTC P0335

(Symptom Code B)
is not set.

• The ignition switch

is ON.

• The fuel injection

pump CMP sensor
signal is generated.

• The CAN

communication
between the ECM
and PCU is normal.

• The ECM detects

that the CKP sensor
signals are not
generated when
doubled fuel
injection pump
rotation speed is
higher than 50
RPM.

• Sensor signal circuit is open

circuit, high resistance, short to
ground, short to battery or short
to ignition voltage.

• Sensor low reference circuit is

open circuit, high resistance,
short to ground, short to battery
or short to ignition voltage.

• Sensor shield ground is open

circuit, high resistance, short to
ground, short to battery or short
to ignition voltage.

• Faulty CKP sensor.

• Faulty ECM.

• Electrical interference.

• Magnetic interference.

• Faulty sensor installation.

• Faulty flywheel circumference.

P0335

(E)

43 ON

Crankshaft
Position (CKP)
Sensor Circuit

• Ignition switch is

ON.

• The ECM detects

that the engine
speed is higher
than 5700 RPM for
0.2 seconds.

• Engine overrun.

• Faulty CKP sensor.

• Faulty ECM.

• Electrical interference.

• Magnetic interference.

• Faulty flywheel circumference.

6E-56 Engine Control System (4JH1)

DTC

(Symptom

Code)

Flash

Code

MIL

Status

DTC Name on

scan tool

Condition for

Running the DTC

Condition for

Setting the DTC

Possible Cause

P0380

(4)

66

ON

Glow Plug Relay
Control Circuit Low
Voltage

• The ignition switch

is ON.

• The ECM detects

that the low voltage
condition on the
glow relay control
circuit for longer
than 3 seconds
when the relay is
commanded OFF.

• ECM (10A) fuse (EB1) open.

• Glow relay ignition voltage feed

circuit on coil side is open circuit
or high resistance.

• Glow relay control circuit is open

circuit, high resistance or short
to ground.

• Glow relay is poor installation.

• Faulty glow relay.

• Faulty ECM.

P0380

(8)

66 ON

Glow Plug Relay
Control Circuit
High Voltage

• The ignition switch

is ON.

• The ECM detect

that the high
voltage condition on
the glow relay
control circuit for
longer than 1
second when the
relay is commanded
ON.

• Glow relay control circuit is short

to battery or ignition voltage
circuit.

• Faulty glow relay.

• Faulty ECM.

P0381

(4)

67 ON

Glow

Plug

Indicator Circuit
Low Voltage

• The ignition switch

is ON.

• The ECM detects

that the low voltage
condition on the
glow indicator lamp
control circuit for
longer than 3
seconds when the
indicator lamp is
commanded OFF.

• Meter (15A) fuse (C-14) open.

• Glow indicator lamp ignition

voltage feed circuit is open
circuit or high resistance.

• Glow indicator lamp control

circuit is open circuit, high
resistance or short to ground.

• Poor harness connector

connection.

• Glow indicator lamp bulb burned

out.

• Faulty instrument panel cluster

(meter assembly).

• Faulty ECM.

P0381

(8)

67 ON

Glow

Plug

Indicator Circuit
High Voltage

• The ignition switch

is ON.

• The ECM detects

that the high
voltage condition on
the glow indicator
lamp control circuit
for longer than 1
second when the
indicator lamp is
commanded ON.

• Glow indicator lamp control

circuit is short to battery or
ignition voltage circuit.

• Faulty instrument panel cluster

(meter assembly).

• Faulty ECM.

P0400

(3)

32 ON

Exhaust

Gas

Recirculation
(EGR) System
Performance

• The ignition switch

is ON.

• The engine is

running.

• The BARO is

between 850 hPa
and 1100 hPa.

• The IAT is between

15°C (59°F) and
100°C (212°F).

• The ECT is

between 35°C
(95°F) and 100°C
(211°F).

• The ECM detects

that the MAF
amount is 150
mg/strk lower than
the desired MAF for
60 seconds.

• MAF sensor circuits are high

resistance.

• MAF sensor signal circuit is short

to IAT sensor signal circuit.

• Intake air leakage.

• Intake duct disconnected.

• Intake system is obstructed.

• Faulty turbocharger.

• Faulty exhaust system.

• Faulty EGR valve vacuum

control system.

• Faulty EGR valve.

• Faulty EGR solenoid valve.

• Faulty EGR solenoid valve

vacuum hose routing.

• Faulty MAF sensor.

Engine Control System (4JH1) 6E-57

DTC

(Symptom

Code)

Flash

Code

MIL

Status

DTC Name on

scan tool

Condition for

Running the DTC

Condition for

Setting the DTC

Possible Cause

P0400

(4)

32 ON

Exhaust

Gas

Recirculation
(EGR) Solenoid
Circuit Low
Voltage

• The ignition switch

is ON.

• The ECM detects

that the low voltage
condition on the
EGR solenoid valve
control circuit for
longer than 3
seconds when the
solenoid valve is
commanded OFF.

• ECM (10A) fuse (EB1) open.

• EGR solenoid valve ignition

voltage feed circuit is open
circuit or high resistance.

• EGR solenoid valve control

circuit is open circuit, high
resistance or short to ground.

• Poor harness connector

connection.

• Faulty EGR solenoid valve.

• Faulty ECM.

P0400

(5)

32 ON

Exhaust

Gas

Recirculation
(EGR) System
Performance

• The ignition switch

is ON.

• The engine is

running.

• The BARO is

between 850 hPa
and 1100 hPa.

• The IAT is between

15°C (59°F) and
100°C (212°F).

• The ECT is

between 35°C
(95°F) and 100°C
(211°F).

• The ECM detects

that the MAF
amount is 150
mg/strk higher than
the desired MAF for
60 seconds.

• MAF sensor low reference circuit

is high resistance.

• Faulty EGR valve vacuum

control system.

• Faulty EGR valve.

• Faulty vacuum pump

• Faulty EGR solenoid valve.

• Faulty EGR solenoid valve

vacuum hose routing.

• Faulty MAF sensor.

• Faulty ECM.

P0400

(8)

32 ON

Exhaust

Gas

Recirculation
(EGR) Solenoid
Circuit High
Voltage

• The ignition switch

is ON.

• The ECM detects

that the high
voltage condition on
the EGR solenoid
valve control circuit
for longer than 3
seconds when the
solenoid valve is
commanded ON.

• EGR solenoid valve control

circuit is short to battery or
ignition voltage circuit.

• Faulty EGR solenoid valve.

• Faulty ECM.

P0500

(1)

24 ON

Vehicle

Speed

Sensor (VSS)
Circuit

• The ignition switch

is ON.

• The ECM detects

that the vehicle
speed is higher
than 200 km/h (125
MPH) for 5
seconds.

• Vehicle speed too high.

• Electrical interference.

• Magnetic interference.

• Faulty A/T VSS. (2WD with A/T)

• Faulty VSS. (Except 2WD with

A/T)

• Faulty ECM.

P0500

(A)

24 ON

Vehicle

Speed

Sensor (VSS)
Circuit

• The ignition switch

is ON.

• The ECM detects

that the vehicle
speed sensor signal
frequency is too
high for 0.6
seconds.

• Electrical interference.

• Magnetic interference.

• Faulty A/T VSS. (2WD with A/T)

• Faulty VSS. (Except 2WD with

A/T)

• Faulty ECM.