Isuzu KB P190. Manual — part 284

6E-102 Engine Control System (4JH1)

DTC P0215 (Symptom Code D) (Flash Code 52)

Circuit Description
The engine control module (ECM) calculates the
desired fuel injection quantity and timing using data sent
from various sensors. These desired data are sent to
the fuel injection pump control unit (PCU) via a
controller area network (CAN) communication bus. The
PCU also receives signals from the internal inputs:
pump camshaft position (CMP) sensor that is located
inside the fuel injection pump to determine the cam ring
rotation angle and the fuel injection pump speed. The
fuel temperature (FT) sensor is internal the PCU. These
values are used to compare the desired values sent
from the ECM then PCU determines the injection timer
piston position and fuel injection quantity, and actuates
timing control valve (TCV) & fuel injection solenoid
valve based on control maps in the PCU.
The ECM monitors CAN operational status by expecting
a constant flow of messages from the PCU. If the ECM
detects that the internal CAN controller does not Bus
OFF when the ignition switch is OFF, this DTC will set.

Condition for Running the DTC

• The ignition switch is OFF.

Condition for Setting the DTC

• The ECM detects internal CAN controller does not

Bus OFF mode.

Action Taken When the DTC Sets

• The ECM illuminates the malfunction indicator

lamp (MIL) when the diagnostic runs and fails.

Condition for Clearing the MIL/DTC

• The ECM turns OFF the MIL when the diagnostic

runs and does not fail.

• A history DTC clears after 40 consecutive driving

cycles without a fault. Or clear with the scan tool.

Diagnostic Aids

• If an intermittent condition is suspected, refer to

Intermittent Conditions in this section.

Notice:

• CAN controller is internal to the ECM.

DTC P0215 (Symptom Code D) (Flash Code 52)

Step Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check-
Engine Controls?



Go to Step 2

Go to Diagnostic

System Check-

Engine Controls

2

1. Install the scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Start the engine and let idle for 30 seconds.
4. Monitor the Diagnostic Trouble Code (DTC)

Information with the scan tool.

5. Turn OFF the engine.
Does the DTC fail this ignition before the engine
control module (ECM) turns OFF?



Go to Step 3

Go to Step 4

3

Important: Replacement ECM must be
programmed.
Replace the ECM. Refer to Engine Control Module
(ECM) Replacement in this section.
Did you complete the replacement?



Go to Step 4



4

1. Clear the DTCs with the scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Start the engine and let idle for 30 seconds.
4. Monitor the DTC Information with the scan tool.
5. Turn OFF the engine.
Does the DTC fail this ignition before the ECM turns
OFF?



Go to Step 3

Go to Step 5

5

Observe the DTC Information with the scan tool.
Are there any DTCs that you have not diagnosed?



Go to Diagnostic

Trouble Code (DTC)

List System

OK

Engine Control System (4JH1) 6E-103

DTC P0216 (Symptom Code A, B) (Flash Code 54)

Description
The engine control module (ECM) calculates the
desired fuel injection quantity and timing using data sent
from various sensors. These desired data are sent to
the fuel injection pump control unit (PCU) via a
controller area network (CAN) communication bus. The
PCU also receives signals from the internal inputs:
pump camshaft position (CMP) sensor that is located
inside the fuel injection pump to determine the cam ring
rotation angle and the fuel injection pump speed. The
fuel temperature (FT) sensor is internal the PCU. These
values are used to compare the desired values sent
from the ECM then PCU determines the injection timer
piston position and fuel injection quantity, and actuates
timing control valve (TCV) & fuel injection solenoid
valve based on control maps in the PCU.

The timing device changes the optimum injection
timing against various engine conditions. The
pressure of the fuel fed from the feed pump is
adjusted and it acts to the timing plunger by TCV
controlled fuel pressure. (

The TCV is installed to the

fuel injection pump rear side and it is controlled by duty
ratio cycle from the PCU.)

The timing plunger is

connected to the cam ring by a ball pin. Axial
movement of the timing plunger is transferred to the
cam ring in the form of rotational movement.
Movement to the right of the timing plunger
advances injection timing.

If the PCU detects an

excessive difference between actual and desired fuel
injection timing, this DTC will set.
Condition for Running the DTC
Symptom Code A

• The engine speed is higher than 700 RPM.
• The fuel injection quantity is higher than 4 mg/strk.

Symptom Code B

• The engine speed is higher than 2014 RPM.

Condition for Setting the DTC
Symptom Code A

• 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.

Symptom Code B

• The PCU monitored actual fuel injection timing is

oscillated higher than desired by 5.2°CA.

Action Taken When the DTC Sets

• The ECM illuminates the malfunction indicator

lamp (MIL) when the diagnostic runs and fails.

• The ECM limits fuel injection quantity.

Condition for Clearing the MIL/DTC

• The ECM turns OFF the MIL when the diagnostic

runs and does not fail.

• A history DTC clears after 40 consecutive driving

cycles without a fault. Or clear with the scan tool.

Diagnostic Aids

• If an intermittent condition is suspected, refer to

Intermittent Conditions in this section.

Notice:

• The fuel injection pump installation with incorrect

mechanical timing may set this DTC.

• This DTC most likely indicate loss fuel pressure by

restricted fuel line. Inspect the fuel line restriction
between the fuel injection pump and fuel tank.

• The fuel system from the fuel tank(s) to the fuel

injection pump is under a slight vacuum with the
engine running. As a result, air can enter the fuel
system if these connections are not tight or if there
is a crack in one of the fuel hoses. Air in the fuel
system will cause fuel injection pump internal
pressure fluctuations especially at high engine
speed and load, which may set this DTC.

• Improper fuel will cause this DTC to set. Inspect

fuel waxing or icing that is caused by an incorrect
fuel type used in winter season or water intrusion
in the fuel system.

• Contaminated fuel will cause this DTC to set.

Inspect the pipe connector fixing bolt (eye bolt) on
the fuel injection pump suction side.

Important:
If the fuel tank is empty or near empty, air might be
allowed to go into the fuel system. With air in the fuel
system, smooth flow of fuel into the fuel injection pump
is interrupted and this DTC may set. Perform bleeding
of fuel system after refilling. Refer to air bleeding
procedure in fuel system section.

DTC P0216 (Symptom Code A, B) (Flash Code 54)

Step Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check-
Engine Controls?



Go to Step 2

Go to Diagnostic

System Check-

Engine Controls

6E-104 Engine Control System (4JH1)

Step Action

Value(s)

Yes

No

2

1. Install the scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Start the engine and let idle for 30 seconds.
4. Monitor the Diagnostic Trouble Code (DTC)

Information with the scan tool.

Is DTC P0335 (Symptom Code B or D), P1335
(Symptom Code A) or P1345 (Symptom Code A)
set?



Go to Applicable

DTC

Go to Step 3

3

1. Turn OFF the engine.
2. Place the transmission in park or neutral (P or N)

and set the park brake.

3. Start the engine and let engine idle for 30

seconds while observing the Actual Injection
Timing parameter with the scan tool.

4. Accelerate the engine and keep the constant

engine speed around 2000 RPM while observing
the Actual Injection Timing parameter with the
scan tool.

5. Accelerate the engine and keep the constant

engine speed around 3000 RPM while observing
the Actual Injection Timing parameter with the
scan tool.

Does the Actual Injection Timing parameter follow
the Desired Injection Timing within 2°CA on each
engine speed?



Go to Diagnostic

Aids

Go to Step 4

4

1. Turn OFF the ignition.
2. Check the fuel system line connections between

the fuel tank and the fuel injection pump for
tightness and all fuel hoses for cuts, cracks and
for the use of proper clamps.

Notice: The fuel system from the fuel tank(s) to the
fuel injection pump is under a slight vacuum with the
engine running. As a result, air can enter the fuel
system if these connections are not tight. Air in the
fuel system will cause fuel injection pump internal
pressure fluctuations especially at high engine
speed and load, which may set this DTC.
3. Pump the priming pump on the fuel filter until it

becomes firm. If there is a leak on the suction
side of the fuel system between the priming
pump and the fuel injection pump, the priming
pump will not build up sufficient firmness and fuel
leakage may occur.

4. Repair or replace as necessary.
Did you find and correct the condition?



Go to Step 9

Go to Step 5

Engine Control System (4JH1) 6E-105

Step Action

Value(s)

Yes

No

5

1. Remove the fuel hose that connects to the fuel

injection pump suction side.

2. Remove the fuel pipe connector that connects to

the fuel injection pump suction side.

3. Inspect the eye bolt for any type of restriction or

collapsed gauze filter.

Notice: If any type of restriction found, check for a
condition that causes contaminated fuel, such as the
customer is using an aftermarket fuel filter or
extended maintenance interval.Also inspect fuel
waxing or icing that is caused by an incorrect fuel
type used in winter season or water intrusion in the
fuel system.
4. Repair or replace as necessary.
Did you find and correct the condition?



Go to Step 9

Go to Step 6

6

1. Disconnect the fuel hose that connects to the

fuel injection pump suction side. In order to
measure the discharged fuel amount, put the
hose into a bottle or a container.

2. Pump the priming pump on the fuel filter.
Notice: If there is a leak on the suction side of the
fuel system, the fuel from the disconnected hose will
not flow out sufficiently and fuel leakage may occur.
Also if there is a restriction on the suction side of the
fuel system, the fuel from the disconnected hose will
not flow out sufficiently that is most likely caused by
clogged fuel filter or kinked fuel hose or pipe.
3. Draw fuel from the fuel tank at the fuel line (as

close to the fuel tank as possible) going to the
fuel pickup tube to verify a clean stream of fuel
comes out (use the hand-held vacuum pump 5-
8840-0279-0/J-23738-A with a clear hose or
equivalent). This will ensure the fuel pickup tube
is not cracked drawing air into the fuel line.

4. Repair any fuel system leaks and restrictions as

necessary.

Did you find and correct the condition?



Go to Step 9

Go to Step 7