Isuzu KB P190. Manual - part 271

6E-50  Engine Control System (4JH1) 

Diagnostic Trouble Code (DTC) List 

DTC 

(Symptom 

Code) 

Flash 

Code 

MIL 

Status 

DTC Name on 

scan tool 

Condition for 

Running the DTC

Condition for 

Setting the DTC

Possible Cause 

P0100 

(7) 

65 

ON 

Mass Air Flow 
(MAF) Sensor 
Circuit 5V 
Reference High 
Voltage 

• The ignition switch 

is ON. 

 

• The ECM detects 

that the MAF sensor 
5 volts reference 
circuit voltage is 
more than 5.2 volts 
for 0.5 seconds. 

• Sensor 5V reference circuit is 

short to battery or ignition 
voltage. 

• Sensor 5V reference circuit is 

short to the sensor ignition 
voltage circuit. 

• Faulty MAF sensor. 

• Faulty ECM. 
 

P0100 

(9) 

65 

ON 

Mass Air Flow 
(MAF) Sensor 
Voltage 5V 
Reference Circuit 
Low Voltage 

• The ignition switch 

is ON. 

 

• The ECM detects 

that the MAF sensor 
5 volts reference 
circuit voltage is 
less than 4.6 volts 
for 0.5 seconds. 

• Sensor 5V reference circuit is 

short to ground. 

• Sensor 5V reference circuit is 

short to the low reference circuit.

• Faulty MAF sensor. 

• Faulty ECM. 
 

P0100 

(B) 

65 

ON 

Mass Air Flow 
(MAF) Sensor 
Circuit Low 
Voltage 

• The ignition switch 

is ON. 

• The engine is 

running. 

 

• The ECM calculated 

MAF is lower than -
18.6 kg/h for 5 
seconds.  

 

• ECM (10A) fuse (EB1) open. 

• Sensor ignition voltage feed 

circuit is open circuit or high 
resistance. 

• Sensor 5V reference circuit is 

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

• Sensor signal circuit is open 

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

• Poor harness connector 

connection. 

• Faulty MAF sensor installation. 

• Faulty MAF sensor. 

• Faulty ECM. 
 

P0100 

(C) 

65 

ON 

Mass Air Flow 
(MAF) Sensor 
Circuit High 
Voltage 

• The ignition switch 

is ON. 

• The engine is 

running. 

 

• The ECM calculated 

MAF is higher than 
984 kg/h for 10 
seconds.  

 

• Sensor signal circuit is short to 

any 5V reference circuit, short to 
battery or ignition voltage circuit.

• Sensor low reference circuit is 

open circuit or high resistance. 

• Poor harness connector 

connection. 

• Faulty MAF sensor. 

• Faulty ECM.  
 

P0105 

(1) 

34 ON 

Vacuum 

Pressure 

Sensor Circuit 
High Voltage 

• The ignition switch 

is ON. 

• The ECM detects 

that the vacuum 
pressure sensor 
signal voltage is 
more than 4.4 volts 
for 3 seconds. 

• Sensor 5V reference circuit is 

short to battery or ignition 
voltage. 

• Sensor signal circuit is short to 

any 5V reference circuit, short to 
battery or ignition voltage. 

• Sensor low reference circuit is 

open circuit or high resistance. 

• Poor harness connector 

connection. 

• Faulty vacuum pressure sensor.

• Faulty ECM.  
 

Engine Control System (4JH1)  6E-51 

DTC 

(Symptom 

Code) 

Flash 

Code 

MIL 

Status 

DTC Name on 

scan tool 

Condition for 

Running the DTC

Condition for 

Setting the DTC

Possible Cause 

P0105 

(2) 

34 ON 

Vacuum 

Pressure 

Sensor Circuit Low 
Voltage 

• The ignition switch 

is ON. 

• The ECM detects 

that the vacuum 
pressure sensor 
signal voltage is 
less than 0.5 volts 
for 3 seconds. 

• Sensor 5V reference circuit is 

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

• Sensor signal circuit is open 

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

• Poor harness connector 

connection. 

• Faulty vacuum pressure sensor.

• Faulty ECM. 
 

P0105 

(7) 

34 ON 

Vacuum 

Pressure 

Sensor Voltage 5V 
Reference Circuit 
High Voltage 
 

• The ignition switch 

is ON. 

• The ECM detects 

that the vacuum 
pressure sensor 5 
volts reference 
circuit voltage is 
more than 5.2 volts 
for 2.5 seconds. 

 

• Sensor 5V reference circuit is 

short to battery or ignition 
voltage. 

• Faulty ECM. 
 

P0105 

(9) 

34 ON 

Vacuum 

Pressure 

Sensor Voltage 5V 
Reference Circuit 
Low Voltage 
 

• The ignition switch 

is ON. 

• The ECM detects 

that the vacuum 
pressure sensor 5 
volts reference 
circuit voltage is 
less than 4.5 volts 
for 2.5 seconds. 

 

• Sensor 5V reference circuit is 

short to ground or short to low 
reference circuit. 

• Faulty vacuum pressure sensor.

• Faulty ECM. 
 

P0110 

(1) 

23 ON 

Intake 

Air 

Temperature (IAT) 
Sensor Circuit 
High Voltage 

• The ignition switch 

is ON. 

 

• The ECM detects 

that the IAT sensor 
signal voltage is 
more than 4.7 volts 
for 3 seconds. 

• Sensor signal circuit is open 

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

• Sensor low reference circuit is 

open circuit or high resistance. 

• Poor harness connector 

connection. 

• Faulty IAT sensor. 

• Faulty ECM. 
 

P0110 

(2) 

23 ON 

Intake 

Air 

Temperature (IAT) 
Sensor Circuit Low 
Voltage 
 

• The ignition switch 

is ON. 

 

• The ECM detects 

that the IAT sensor 
signal voltage is 
less than 0.3volts 
for 3 seconds. 

 

• Sensor signal circuit is short to 

ground or short to the low 
reference circuit. 

• Faulty IAT sensor. 

• Faulty ECM. 

P0115 

(1) 

14 ON 

Engine 

Coolant 

Temperature 
(ECT) Sensor 
Circuit High 
Voltage 

• The ignition switch 

is ON. 

 

• The ECM detects 

that the ECT sensor 
signal voltage is 
more than 4.7 volts 
for 3 seconds. 

• Sensor signal circuit is open 

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

• Sensor low reference circuit is 

open circuit or high resistance. 

• Poor harness connector 

connection. 

• Faulty ECT sensor. 

• Faulty ECM.  
 

P0115 

(2) 

14 ON 

Engine 

Coolant 

Temperature 
(ECT) Sensor 
Circuit Low 
Voltage 
 

• The ignition switch 

is ON. 

 

• The ECM detects 

that the ECT sensor 
signal voltage is 
less than 0.3volts 
for 3 seconds. 

• Sensor signal circuit is short to 

ground or short to the low 
reference circuit. 

• Faulty ECT sensor. 

• Faulty ECM.  
 

6E-52  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 

P0180 

(B) 

15 ON 

Fuel 

Temperature 

Sensor Circuit 

• Ignition switch is 

ON. 

 

•  The PCU internal 

FT sensor output is 
lower than -40°C (-
40°F) for 3 seconds 
or higher than 
150°C (302°F) for 3 
seconds. 

 

• Faulty PCU. 
 

P0215 

(A) 

52 ON 

at 

next 

ignition 

cycle 

Engine Shutoff 
(ESO) Solenoid 
Control Circuit 

• The ignition switch 

is OFF. 

• The engine speed 

is lower than 1500 
RPM. 

• The vehicle speed 

is lower than 1.5 
km/h (1 MPH). 

 

• After the condition 

for running the DTC 
for 2 seconds, the 
engine speed is 
higher than 200 
RPM when the ESO 
solenoid valve is 
commanded shutoff 
from the PCU.  

 

• Faulty fuel injection pump. 
 

P0215 

(B) 

52 ON 

Engine 

Shutoff 

(ESO) Solenoid 
Control Circuit 

• The ignition switch 

is ON. 

• The PCU detects 

high voltage 
condition on the 
ESO solenoid valve 
control circuit for 
longer than 1 
second when the 
ECM does not 
command shutoff. 

 

• ESO solenoid valve control 

circuit is short to battery or 
ignition voltage. 

• Faulty PCU. 

• Faulty ECM. 
 

P0215 

(C) 

52 ON 

Engine 

Shutoff 

(ESO) Solenoid 
Control Circuit 

• The ignition switch 

is OFF. 

• The engine speed 

is lower than 1500 
RPM. 

• The vehicle speed 

is lower than 1.5 
km/h (1 MPH).  

 

• The engine speed 

is higher than 200 
RPM within 2 
seconds after the 
condition for 
running the DTC 
are met. 

 

• ESO solenoid valve control 

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

• Faulty PCU. 

• Faulty ECM. 
 

P0215 

(D) 

52 ON 

Engine 

Shutoff 

(ESO) Solenoid 
Control Circuit 
 

• The ignition switch 

is OFF. 

• The ECM detects 

internal CAN 
controller does not 
Bus OFF mode. 

 

• Faulty ECM. 
  
 

P0216 

(A) 

54 ON 

Injection 

Timing 

Control Circuit 

• The engine speed 

is higher than 700 
RPM. 

• The fuel injection 

quantity is higher 
than 4 mg/strk. 

 

• The PCU monitored 

actual fuel injection 
timing is advanced 
more than desired 
by 3°CA for longer 
than 12 seconds or 
retarded more than 
desired by 6°CA for 
longer than 12 
seconds. 

 

• Excessive air in the fuel system.

• Loss fuel. 

• Fuel suction side looseness, 

kinks or blocked. 

• Faulty or clogged fuel filter. 

• Contaminated fuel. 

• Faulty timing device. 

• Faulty fuel injection pump CMP 

sensor. 

 
 

P0216 

(B) 

54 ON 

Injection 

Timing 

Control Circuit 

• The engine speed 

is higher than 2014 
RPM. 

 

• The PCU monitored 

actual fuel injection 
timing is oscillated 
higher than desired 
by 5.2°CA. 

 

• Excessive air in the fuel system.

• Loss fuel. 

• Fuel suction side looseness, 

kinks or blocked. 

• Faulty or clogged fuel filter. 

• Contaminated fuel. 

• Faulty timing device. 

• Faulty fuel injection pump CMP 

sensor. 

  

Engine Control System (4JH1)  6E-53 

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 

(3) 

64 ON 

Turbocharger 
Waste gate 
Solenoid Boost 
Solenoid Circuit 

• The ignition switch 

is ON.  

• The BARO is 

between 0 hPa and 
3500 hPa. 

• The IAT is between 

-50°C (-58 °F) and 
200°C (392°F). 

• The ECT is 

between -50°C (-
58 °F) and 150°C 
(302°F).  

 

• The ECM detects 

that the vacuum 
pressure is 50 hPa 
lower than the 
desired vacuum 
pressure for 3 
seconds. 

 

• Vacuum pressure sensor circuits 

are high resistance. 

• Faulty vacuum hoses 

• Misrouted vacuum hoses. 

• Faulty vacuum pressure sensor.

• Faulty turbocharger solenoid 

valve. 

• Faulty vacuum regulating valve.

• Faulty turbocharger wastegate 

valve. 

• Faulty ECM. 
 

P0243 

(4) 

64 ON 

Turbocharger 
Waste gate 
Solenoid Boost 
Solenoid Circuit 
Low Voltage 

• The ignition switch 

is ON. 

 

• The ECM detects 

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

 

• ECM (10A) fuse (EB1) open. 

• Turbocharger solenoid valve 

ignition voltage feed circuit is 
open circuit or high resistance. 

• Turbocharger solenoid valve 

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

• Poor harness connector 

connection. 

• Faulty turbocharger solenoid 

valve. 

• Faulty ECM.  
 

P0243 

(5) 

64 ON 

Turbocharger 
Wastegate 
Solenoid Boost 
Solenoid Circuit 

• The ignition switch 

is ON.  

• The BARO is 

between 0 hPa and 
3500 hPa. 

• The IAT is between 

-50°C (-58 °F) and 
200°C (392°F). 

• The ECT is 

between -50°C (-
58 °F) and 150°C 
(302°F).  

 

• The ECM detects 

that the vacuum 
pressure is 50 hPa 
higher than the 
desired vacuum 
pressure for 3 
seconds. 

 

• Vacuum pressure sensor low 

reference circuit is high 
resistance. 

• Faulty vacuum hoses 

• Misrouted vacuum hoses. 

• Faulty vacuum pressure sensor.

• Faulty turbocharger solenoid 

valve. 

• Faulty vacuum regulating valve.

• Faulty turbocharger wastegate 

valve. 

• Faulty ECM. 
 

P0243 

(6) 

64 ON 

Turbocharger 
Waste gate 
Solenoid Boost 
Solenoid Circuit 

• The ignition switch 

is ON.  

• The ECT is 

between -50°C (-
58 °F) and 150°C 
(302°F). 

• The EGR solenoid 

valve control is 
OFF. 

• The MAF sensor 

DTC P0100 is not 
set. 

• The vacuum 

pressure sensor 
DTC P0105 is not 
set. 

• The IAT sensor 

DTC P0110 is not 
set.  

 

• The ECM detects 

that the MAF 
amount is 56 
mg/strk higher than 
the desired MAF for 
3 seconds.  

 

• Faulty turbocharger wastegate 

valve. 

• MAF sensor low reference circuit 

is high resistance. 

• Faulty EGR valve vacuum 

control system. 

• Faulty EGR valve. 

• Faulty EGR solenoid valve. 

• Faulty EGR solenoid valve 

vacuum hose routing. 

• Faulty MAF sensor.