Isuzu N-Series. Service manual — part 663
6E-74 Engine Control System (4HK1)
P0380
66
ON
Glow Plug Relay
Control Circuit
• The ignition switch is
ON.
• The battery voltage
is between 16 – 32
volts.
Either of following
condition is met:
• The ECM detects a
low voltage
condition on the
glow relay control
circuit when the
relay is commanded
OFF for longer than
5 seconds.
• The ECM detects a
high voltage
condition on the
glow relay control
circuit when the
relay is commanded
ON for longer than 5
seconds.
• Relay voltage feed circuit
is open circuit or high
resistance.
• Relay control circuit is
short to battery, ignition
voltage, short to ground,
open circuit or high
resistance.
• Poor harness connector
connection.
• Faulty relay.
• Faulty ECM.
P0381
67
OFF
Glow Plug Lamp
Control Circuit
• The ignition switch is
ON.
• The ignition voltage
is more than 18
volts.
Either of following
condition is met:
• The ECM detects a
low voltage
condition on the
glow indicator lamp
control circuit when
the indicator is
commanded OFF for
longer than 5
seconds.
• The ECM detects a
high voltage
condition on the
glow indicator lamp
control circuit when
the indicator is
commanded ON for
longer than 5
seconds.
• Lamp voltage feed circuit
is open circuit or high
resistance.
• Lamp control circuit is
short to battery, ignition
voltage, short to ground,
open circuit or high
resistance.
• Poor harness connector
connection.
• Faulty instrument panel
cluster.
• Faulty lamp.
• Faulty ECM.
P0485
44
ON
EGR Valve
Position Sensor
Circuit Low
Voltage
• DTCs P1630 and
P1635 are not set.
• The ignition switch is
ON.
• The ignition voltage
is more than 18
volts.
• The ECM detects
that the EGR valve
position 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. (P1635
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. (EGR
valve)
• Faulty ECM.
DTC
Flash
Code
MIL
Status
DTC Name
Condition for Running
the DTC
Condition for Setting the
DTC
Possible Cause
Engine Control System (4HK1) 6E-75
P0486
44
ON
EGR Valve
Position Sensor
Circuit High
Voltage
• DTCs P1630 and
P1635 are not set.
• The ignition switch is
ON.
• The ignition voltage
is more than 18
volts.
• The ECM detects
that the EGR valve
position sensor
signal voltage is
more than 4.9 volts
for 5 seconds.
• Sensor 5V reference
circuit is short to battery
or ignition voltage.
(P1635 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. (EGR
valve)
• Faulty ECM.
P0488
45
ON
Exhaust Gas
Recirculation
(EGR) Valve
Performance
• DTCs P0485,
P0486, P1630 and
P1635 are not set.
• The ignition switch is
ON.
• The battery voltage
is between 20 – 32
volts.
• The ignition voltage
is more than 18
volts.
• The desired EGR
valve position is
stable.
• The ECM detects a
variance between
the actual EGR
valve position and
desired valve
position is more than
20% for longer than
20 seconds when
the EGR solenoid
command duty is
more than 90%.
• Valve stick.
• Motor voltage feed circuit
is short to battery,
ignition voltage, short to
ground, short to the
sensor low reference
circuit, open circuit or
high resistance.
• Duty signal circuit is
short to battery, ignition
voltage, short to ground,
short to the sensor low
reference circuit, open
circuit or high resistance.
• Poor harness connector
connection.
• Faulty EGR valve.
• Faulty ECM.
P0500
25
ON
Vehicle Speed
Sensor (VSS)
Circuit
• The ignition switch is
ON.
• The ignition voltage
is more than 18
volts.
• The engine speed is
more than 2000
RPM.
• The commanded
fuel is OFF
(accelerator pedal is
released).
• The ECM detects
that the VSS signals
are not generated
for 5 seconds.
• Faulty sensor
installation.
• Sensor voltage feed
circuit is open circuit or
high resistance.
• Sensor signal circuit is
short to battery, ignition
voltage, short to ground,
open circuit or high
resistance.
• Sensor low reference
circuit is open circuit or
high resistance.
• 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
6E-76 Engine Control System (4HK1)
P0501
25
ON
Vehicle Speed
Sensor (VSS)
Performance
• The ignition switch is
ON.
• The ignition voltage
is more than 18
volts.
• The ECM detects
that the VSS signal
are changed larger
than a
predetermined
vehicle speed.
• Sensor installation is
poor condition.
• Sensor circuit is
intermittently open circuit
or poor connection.
• Faulty sensor.
• Electromagnetic
interference and
electrical noise.
P0601
53
ON
Control Module
Read Only
Memory (ROM)
—
• The ECM detects a
malfunction in its
internal flash read
memory (ROM).
• Faulty ECM.
P0603
54
ON
Control Module
Read Only
Memory (ROM)
—
Either of following
condition is met:
• The ECM detects a
malfunction in its
internal electrically
erasable &
programmable read
only memory
(EEPROM).
• The ECM detects
that the calculated
checksum does not
agree with the ECM
internal registered
checksum.
• Faulty ECM.
P0606 51/52
ON
Control Module
Internal
Performance
• The ignition switch is
ON.
• The battery voltage
is more than 16
volts.
Either of following
condition is met:
• The ECM detects a
malfunction in its
internal main central
processing unit
(CPU). (Flash Code
51)
• The ECM detects a
malfunction in its
internal sub CPU.
(Flash Code 52)
• ECM voltage feed circuit
is high resistance.
• ECM ground circuit is
open circuit or high
resistance.
• Faulty ECM.
P0611
34
ON
Fuel Injector
Control Module
Performance
Group 1
• The ignition switch is
ON.
• The battery voltage
is more than 18
volts.
• The ECM detects
that the common 1
fuel injector charge
up circuit is
insufficient charge.
• ECM voltage feed circuit
is high resistance.
• ECM ground circuit is
open circuit or high
resistance.
• Faulty ECM.
P0612
34
ON
Fuel Injector
Control Module
Performance
Group 2
• The ignition switch is
ON.
• The battery voltage
is more than 18
volts.
• The ECM detects
that the common 2
fuel injector charge
up circuit is
insufficient charge.
• ECM voltage feed circuit
is high resistance.
• ECM ground circuit is
open circuit or high
resistance.
• Faulty ECM.
DTC
Flash
Code
MIL
Status
DTC Name
Condition for Running
the DTC
Condition for Setting the
DTC
Possible Cause
Engine Control System (4HK1) 6E-77
P0615
19
ON
Starter Relay
Control Circuit
• The ignition switch is
ON.
• The battery voltage
is between 16 – 32
volts.
Either of following
condition is met:
• The ECM detects a
low voltage
condition on the
starter cut relay
control circuit when
the relay is
commanded OFF for
longer than 10
seconds.
• The ECM detects a
high voltage
condition on the
starter cut relay
control circuit when
the relay is
commanded ON for
longer than 10
seconds.
• Relay voltage feed circuit
is open circuit or high
resistance.
• Relay control circuit is
short to battery, ignition
voltage, short to ground,
open circuit or high
resistance.
• Poor harness connector
connection.
• Faulty relay.
• Faulty ECM.
P0650
77
OFF
Malfunction
Indicator Lamp
(MIL) Control
Circuit
• The ignition switch is
ON.
• The ignition voltage
is more than 18
volts.
Either of following
condition is met:
• The ECM detects a
low voltage
condition on the MIL
control circuit when
the indicator is
commanded OFF for
longer than 3
seconds.
• The ECM detects a
high voltage
condition on the MIL
control circuit when
the indicator is
commanded ON for
longer than 3
seconds.
• Lamp voltage feed circuit
is open circuit or high
resistance.
• Lamp control circuit is
short to battery, ignition
voltage, short to ground,
open circuit or high
resistance.
• Poor harness connector
connection.
• Faulty instrument panel
cluster.
• Faulty lamp.
• Faulty ECM.
DTC
Flash
Code
MIL
Status
DTC Name
Condition for Running
the DTC
Condition for Setting the
DTC
Possible Cause
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