
Hino J05d/J08e Engine ECU Fault Codes List
Diagnostics Trouble Codes
The VNT actuator has a malfunction.
Turbo Charger Turbine
Over speed
The turbine rotation
sensor has been
detected.
Over speed of the turbo has been detected.
Common Rail
Pressure -Too high
High fuel pressure has been detected.
Fuel System Leak
Detected
The pump does not
work properly. (Fuel
leak)
There is a possibility of the fuel leakage.
Perform the fuel leakage check.
Mass Air Flow Sensor
Malfunction (LO)
"The mass air flow sensor has a malfunction.
There are possibilities of the sensor malfunction,
open and short circuit to ground in the harness."
Mass Air Flow Sensor
Malfunction (HI)
The mass air flow sensor has a malfunction.
There are possibilities of the sensor malfunction and
short circuit to +B in the harness.
Boost Pressure Sensor
Malfunction (HI)
The boost pressure cannot be detected properly.
There are possibilities of the sensor malfunction and
short circuit in the harness.
Intake Air Temperature
Sensor Malfunction (LO)
Integrated in the mass
air flow sensor.
"The temperature cannot be detected properly.
There are possibilities of the sensor malfunction,
short circuit to ground in the harness."
Intake Air Temperature
Sensor Malfunction (HI)
Integrated in the mass
air flow sensor.
"The temperature cannot be detected properly.
There are possibilities of the sensor malfunction,
open and short circuit to +B in the harness."
Engine Coolant
Temperature Sensor
Malfunction (LO)
The temperature cannot be detected properly.
There are possibilities of the sensor malfunction and
short circuit to ground in the harness.
Engine Coolant
Temperature Sensor
Malfunction (HI)
"The temperature cannot be detected properly.
There are possibilities of the sensor malfunction,
open and short circuit to +B in the harness."

Fuel Temperature
Sensor Malfunction (LO)
Integrated in the supply
pump.
"The temperature cannot be detected properly.
There are possibilities of the sensor malfunction,
short circuit to ground in the harness."
Fuel Temperature
Sensor Malfunction (HI)
Integrated in the supply
pump.
"The temperature cannot be detected properly.
There are possibilities of the sensor malfunction,
open and short circuit to +B in the harness."
Rail Pressure Sensor
Malfunction
Characteristic malfunction
The rail pressure cannot be detected properly.
There is a possibility of the sensor malfunction.
Rail Pressure Sensor
Malfunction (LO)
The rail pressure cannot be detected properly.
There are possibilities of the sensor malfunction and
short circuit to ground in the harness.
Rail Pressure Sensor
Malfunction (HI)
"The rail pressure cannot be detected properly.
There are possibilities of the sensor malfunction,
open and short circuit to +B in the harness."
ECU Charge Circuit
Malfunction (HI)
The voltage for the injector activation is too high.
Replace the ECU.
There is a possibility of the Injector 1 malfunction or
open circuit in the harness.
There is a possibility of the Injector 2 malfunction or
open circuit in the harness.
There is a possibility of the Injector 3 malfunction or
open circuit in the harness.
There is a possibility of the Injector 4 malfunction or
open circuit in the harness.
There is a possibility of the Injector 5 malfunction or
open circuit in the harness.
There is a possibility of the Injector 6 malfunction or
open circuit in the harness.
Over Temperature
Condition
The over temperature condition has been detected.
Check the cooling system.
Engine Over speed
Condition
The engine speed exceeded the rated value.
Turbo Charger
Overboost Condition
The boost pressure is too higher than the specified
value.
Boost Pressure Sensor
Malfunction (LO)
"The intake air pressure cannot be detected properly.
There are possibilities of the sensor malfunction,
open and short circuit in the harness."
Correction Error
Between Cylinders #1
The rotation fluctuation in the cylinder 1 became bigger than other cylinders.
There is a possibility that the flow damper is operating.

Correction Error
Between Cylinders #2
The rotation fluctuation in the cylinder 2 became big-
ger than other cylinders.
There is a possibility that the flow damper is operating.
Correction Error
Between Cylinders #3
The rotation fluctuation in the cylinder 3 became bigger than other cylinders.
There is a possibility that the flow damper is operating.
Correction Error
Between Cylinders #4
The rotation fluctuation in the cylinder 4 became bigger than other cylinders.
There is a possibility that the flow damper is operating.
Correction Error
Between Cylinders #5
The rotation fluctuation in the cylinder 5 became bigger than other cylinders.
There is a possibility that the flow damper is operating.
Correction Error
Between Cylinders #6
The rotation fluctuation in the cylinder 6 became bigger than other cylinders.
There is a possibility that the flow damper is operating.
Crankshaft Position
Sensor Malfunction
"In case that the NE
and G sensor have
malfunctions, this P
code will be output."
The pulse from the crankshaft position sensor cannot be detected.
There are possibilities of the sensor and harness
malfunctions.
Engine Speed Sensor
Malfunction
The pulse from the engine speed sensor cannot be
detected.
There are possibilities of the sensor and harness
malfunctions.
Clogging has been
detected by the lift sensor.
The EGR valve 1 is clogged in the open state.
EGR Lift Sensor 1
Malfunction (LO)
"The EGR lift sensor 1 has a malfunction.
There are possibilities of the sensor malfunction,
open and short circuit to ground in the harness."
EGR Lift Sensor 1
Malfunction (HI)
The EGR lift sensor 1 has a malfunction.
There are possibilities of the sensor malfunction and
short circuit to +B in the harness.
EGR Lift Sensor 2
Malfunction (LO)
"The EGR lift sensor 2 has a malfunction.
There are possibilities of the sensor malfunction,
open and short circuit to ground in the harness."
EGR Lift Sensor 2
Malfunction (HI)
The EGR lift sensor 2 has a malfunction.
There are possibilities of the sensor malfunction and
short circuit to +B in the harness.
EGR Solenoid Valve 1
Malfunction
"The EGR solenoid valve 1 has a malfunction.
There are possibilities of the solenoid valve malfunction, open and short circuit to ground in the harness."

EGR Solenoid Valve 1
Malfunction
The EGR solenoid valve 1 has a malfunction.
There are possibilities of the solenoid valve malfunction and short circuit to +B in the harness.
Vehicle Speed Sensor
Malfunction (LO)
The pulse from the vehicle speed sensor cannot be
detected .
There are possibilities of the sensor and harness
malfunctions.
Vehicle Speed Sensor
Malfunction (HI)
The pulse from the vehicle speed sensor has an
error.
There are possibilities of the sensor and harness
malfunctions.
The idle switch does not function properly.
Monitor the state and check the ON/OFF judgment.
Engine Oil Pressure Too
Low
The engine oil pressure became too low.
Clogging has been
detected by the lift
sensor.
The EGR valve 2 system is clogged in the open
state.
Preheating System
Malfunction
The intake heater relay has a malfunction.
There are possibilities of the relay and harness malfunctions.
Exhaust Gas Temperature Sensor 1
Malfunction (LO)
The temperature cannot be detected properly.
There are possibilities of the sensor malfunction and
short circuit to ground in the harness.
Exhaust Gas Temperature Sensor 1
Malfunction (HI)
"The temperature cannot be detected properly.
There are possibilities of the sensor malfunction,
open and short circuit to +B in the harness."
There is an internal malfunction in the ECU.
Replace the ECU.
CPU Malfunction (Hardware Detected)
There is an internal malfunction in the ECU.
Replace the ECU.
CPU Monitoring ID
Malfunction
There is an internal malfunction in the ECU.
Replace the ECU.
ECU Charge Circuit
Malfunction
The voltage for the injector activation is too low.
Replace the ECU.
Starter Switch
Malfunction
There is a short in the starter switch circuit.
Monitor the state and check the ON/OFF judgment.
The main relay cannot be turned OFF.
Check the relay.
Clutch Switch
Malfunction
The clutch switch cannot be detected properly.
Monitor the state and check the ON/OFF judgment.
Neutral Switch
Malfunction
The neutral switch cannot be detected properly.
Monitor the state and check the ON/OFF judgment.

Accelerator Position
Sensor for Operation
(LO)
The accelerator position sensor for operation cannot
be detected properly.
Check the sensor voltage.
There are possibilities of open and short circuit to
ground.
Accelerator Position
Sensor for Operation
(HI)
The accelerator position sensor for operation cannot
be detected properly.
Check the sensor voltage.
There is a possibility of short circuit to +B.
The idle volume cannot be detected properly. Check
the sensor voltage.
There are possibilities of open and short circuit to
ground.
The idle volume cannot be detected properly. Check
the sensor voltage.
There is a possibility of short circuit to +B.
Injector Common 1
Malfunction
There is a possibility of short circuit to ground.
Check the injector and wiring.
Injector Common 1
Malfunction
There is a possibility of open or short circuit to +B.
Check the injector and wiring.
Injector Common 2
Malfunction
There is a possibility of short circuit to ground.
Check the injector and wiring.
Injector Common 2
Malfunction
There is a possibility of open or short circuit to +B.
Check the injector and wiring.
Exhaust Pressure
Sensor Malfunction (LO)
"The exhaust pressure cannot be detected properly.
There are possibilities of the sensor malfunction,
open and short circuit to ground in the harness."
Exhaust Pressure
Sensor Malfunction (HI)
The exhaust pressure cannot be detected properly.
There are possibilities of the sensor malfunction and
short circuit to +B in the harness.
Transmission Retarder
Relay Malfunction
Transmission retarder
relay linked with the
cruise control system
for the large- and
medium-size vehicles
"The transmission retarder relay has a malfunction.
There are possibilities of the relay malfunction, open
and short circuit to ground in the harness."
Transmission Retarder
Relay Malfunction
Transmission retarder
relay linked with the
cruise control system
for the large- and
medium-size vehicles
The transmission retarder relay has a malfunction.
There are possibilities of the relay malfunction and
short circuit to +B in the harness.

Cruise Control Retarder
Relay Malfunction
Transmission retarder
relay linked with the
cruise control system
for the medium-size
vehicle
"The cruise control retarder relay has a malfunction.
There are possibilities of the relay malfunction, open
and short circuit to ground in the harness."
Cruise Control Retarder
Relay Malfunction
Transmission retarder
relay linked with the
cruise control system
for the medium-size
vehicle
The cruise control retarder relay has a malfunction.
There are possibilities of the relay malfunction and
short circuit to +B in the harness.
Engine Stop Switch
Close Malfunction
The engine stop switch has a malfunction or there is
short circuit in the wiring.
Monitor the state and check the ON/OFF judgment.
Cruise Control Switch
Malfunction
The cruise control switch has a malfunction and
remains ON.
Monitor the state and check the ON/OFF judgment.
The QR code has an error. Check the QR code.
Exhaust Brake Solenoid
Valve Malfunction
"The exhaust brake solenoid valve has a malfunction. There are possibilities of the solenoid valve
malfunction, open and short circuit to ground in the
harness."
Exhaust Brake Solenoid
Valve Malfunction
The exhaust brake solenoid valve has a malfunction.
There are possibilities of the solenoid valve malfunction and short circuit to +B in the harness.
The DPR system has a malfunction.
There are possibilities of the melt down and clogging. Perform the DPR system check.
Exhaust Gas Temperature Sensor 2
Malfunction (LO)
The temperature cannot be detected properly.
There are possibilities of the sensor malfunction and
short circuit to ground in the harness.
Exhaust Gas Temperature Sensor 2
Malfunction (HI)
"The temperature cannot be detected properly.
There are possibilities of the sensor malfunction,
open and short circuit to +B in the harness."
Accelerator Position
Sensor 1&2 Malfunction
Both the accelerator sensor 1 and 2 have malfunctions. There are possibilities of the sensor and harness malfunctions.
Accelerator Position
Sensor 1 Malfunction
The accelerator position sensor 1 cannot be
detected properly. Check the sensor voltage.
Accelerator Position
Sensor 1 Malfunction
(LO)
The accelerator position sensor 1 cannot be
detected properly. Check the sensor voltage.
Accelerator Position
Sensor 1 Malfunction
(HI)
The accelerator position sensor 1 cannot be
detected properly. Check the sensor voltage. There
is a possibility of short circuit to +B.
Accelerator Position
Sensor 2 Malfunction
The accelerator position sensor 2 cannot be
detected properly. Check the sensor voltage.

Accelerator Position
Sensor 2 Malfunction
(LO)
The accelerator position sensor 2 cannot be
detected properly. Check the sensor voltage. There
are possibilities of open and short circuit to ground.
Accelerator Position
Sensor 2 Malfunction
(HI)
The accelerator position sensor 2 cannot be
detected properly. Check the sensor voltage. There
is possibility of short circuit to +B.
Atmospheric Air Pressure Sensor
Malfunction (LO)
"The atmosphere pressure sensor (in ECU) has a
malfunction. If the malfunction occurs frequently, it is
necessary to repair or replace the ECU."
Atmospheric Air Pressure Sensor
Malfunction (HI)
"The atmosphere pressure sensor (in ECU) has a
malfunction. If the malfunction occurs frequently, it is
necessary to repair or replace the ECU."
CAN Communication
Malfunction (Engine)
There is a malfunction of communication with the
VNT.
Lost Communication
(Transmission)
Communication error
between pro-shift and
AT-ECU
Communication with the transmission ECU is lost.
U0104
Lost Communication
(Cruise control)
Communication with the auto cruise ECU is lost.
Communication with the ABS ECU is lost.
Lost Communication
(Air suspension)
Communication with the air suspension ECU is lost.
Lost Communication
(Meter)
Communication with the meter ECU is lost.
CAN Communication
error (Vehicle)
CAN communication
bus OFF judgment
There is a malfunction of communication with other
computers equipped in vehicle.
EGR Solenoid 1
Malfunction
When linear solenoid
specific P code is
obtained
"The EGR solenoid 1 has a malfunction.
There are possibilities of solenoid valve malfunction,
open and short circuit to ground in the harness."
EGR Solenoid 1
Malfunction
When linear solenoid
specific P code is
obtained
The EGR solenoid 1 has a malfunction.
There are possibilities of solenoid valve malfunction
and short circuit to +B in the harness.
EGR Solenoid 2
Malfunction
When linear solenoid
specific P code is
obtained
"The EGR solenoid 2 has a malfunction.
There are possibilities of solenoid valve malfunction,
open and short circuit to ground in the harness."
EGR Solenoid 2
Malfunction
When linear solenoid
specific P code is
obtained
The EGR solenoid 2 has a malfunction.
There are possibilities of solenoid valve malfunction
and short circuit to +B in the harness.

ECU External Wiring Diagram

ECU Connector Diagram
ECU Connector Terminal Layout
Terminal Connections
Accelerator position sensor 1
Accelerator position sensor 2
Accelerator position sensor for operation
Intake air temp. sensor (Build-in Airflow meter)
Exhaust brake solenoid valve

No. Pin Symbol Connections
Hydraulic pressure switch
EGR linear solenoid drive 1
EGR linear solenoid drive 2

HP 3 or 4 pump control valve drive signal
HP 3 or 4 pump control valve drive signal
HP 3 or 4 pump control valve power
HP 3 or 4 pump control valve power
Atmospheric air pressure sensor