Isuzu N-Series. Manual - part 758

 Engine Control System (4JH1)    6E-83

4

1.

Clear the DTCs with the Tech 2.

2.

Turn OFF the ignition for 30 seconds.

3.

Start the engine.

4.

Monitor the DTC Information with the Tech 2.

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 Tech 2.

Are there any DTCs that you have not diagnosed?

—

Go to Diagnostic 

Trouble Code (DTC) 

List

System OK

Step

Action

Value(s)

Yes

No

6E-84    Engine Control System (4JH1) 

P0215 (Symptom Code B) (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 fuel injection solenoid valve is installed to the fuel
injection pump rear side.  The fuel injection event is
determined by this solenoid ON/OFF command.  The
fuel injection solenoid valve cuts the fuel when the
engine shutoff (ESO) solenoid valve is commanded
shutoff from the PCU.  (The fuel injection solenoid
valve and engine shutoff (ESO) solenoid valve is same
part.  It calls ESO solenoid valve when fuel is shutoff.)
When the ignition switch is turned OFF or commanded
from fail-safe action, the ESO solenoid valve is
commanded shutoff to stop the engine running.  If the
PCU detects that the ESO solenoid valve control circuit
voltage level from the ECM to PCU is high, this DTC
will set.

Condition for Running the DTC

• The ignition switch is ON.

Condition for Setting the DTC

• 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.

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 Tech 2.

Diagnostic Aids

• If an intermittent condition is suspected, refer to

Intermittent Conditions in this section.

Notice:

• Fuel injection solenoid valve is internal to the fuel

injection pump assembly.

• PCU is part of the fuel injection pump assembly.
• If this DTC is present, engine will not start.

DTC P0215 (Symptom Code B) (Flash Code 52)
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls
Connector End Views or Engine Control Module (ECM)
Connector End Views

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 Tech 2.

2.

Turn OFF the ignition for 30 seconds.

3.

Start the engine.  If the engine does not start,
crank over the engine.

4.

Monitor the Diagnostic Trouble Code (DTC)
Information with the Tech 2.

Does the DTC fail this ignition?

—

Go to Step 3

Go to Diagnostic 

Aids

3

1.

Turn OFF the ignition.

2.

Disconnect the fuel injection pump control unit
(PCU) harness connector.

3.

Connect a test lamp between the engine
shutoff (ESO) solenoid valve control signal
circuit (pin 5 of E-110 connector) and a known
good ground.

4.

Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

—

Go to Step 5

Go to Step 4

 Engine Control System (4JH1)    6E-85

4

1.

Turn OFF the ignition.

2.

Reconnect the PCU harness connector.

3.

Disconnect the engine control module (ECM)
B-233 harness connector.  Keep the B-234
harness connector with connected.

4.

Connect a test lamp between the ESO
solenoid valve control signal circuit (pin 105 of
B-233 connector) and a known good ground.

5.

Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

—

Go to Step 6

Go to Diagnostic 

Aids

5

1.

Test the ESO solenoid valve control signal
circuit between the ECM (pin 105 of B-233
connector) and the PCU (pin 5 of E-110
connector) for a short to battery or ignition
voltage.

2.

Repair the circuit(s) as necessary.

Did you find and correct the condition?

—

Go to Step 8

Go to Step 7

6

Important:
The fuel injection pump must be timed to the
engine.

Replace the fuel injection pump.  Refer to Fuel
Injection Pump Replacement in engine mechanical
section.

Did you complete the replacement?

—

Go to Step 8

—

7

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 8

—

8

1.

Reconnect all previously disconnected
harness connector(s).

2.

Clear the DTCs with the Tech 2.

3.

Turn OFF the ignition for 30 seconds.

4.

Start the engine.

5.

Monitor the DTC Information with the Tech 2.

Did the DTC fail this ignition?

—

Go to Step 3

Go to Step 9

9

Observe the DTC Information with the Tech 2.

Are there any DTCs that you have not diagnosed?

—

Go to Diagnostic 

Trouble Code (DTC) 

List

System OK

Step

Action

Value(s)

Yes

No

6E-86    Engine Control System (4JH1) 

P0215 (Symptom Code C) (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 fuel injection solenoid valve is installed to the fuel
injection pump rear side.  The fuel injection event is
determined by this solenoid ON/OFF command.  The
fuel injection solenoid valve cuts the fuel when the
engine shutoff (ESO) solenoid valve is commanded
shutoff from the PCU.  (The fuel injection solenoid
valve and engine shutoff (ESO) solenoid valve is same
part.  It calls ESO solenoid valve when fuel is shutoff.)
When the ignition switch is turned OFF or commanded
from fail-safe action, the ESO solenoid valve is
commanded shutoff to stop the engine running.  If the
ECM detects that the engine is continuously run after
the ignition switch is OFF, this DTC will set.

Condition for Running the DTC

• The ignition switch is OFF.
• The engine speed is lower than 1500 RPM.
• The vehicle speed is lower than 1.5 km/h (1MPH).

Condition for Setting the DTC

• The engine speed is higher than 200 RPM within 2

seconds after the condition for running the DTC
are met.  This indicates the PCU does not react to
the command from the ECM and fuel cannot
shutoff.

Action Taken When the DTC Sets

• The ECM illuminates the malfunction indicator

lamp (MIL) when the diagnostic runs and fails.

• The ECM cuts fuel injection.

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 Tech 2.

Diagnostic Aids

• If an intermittent condition is suspected, refer to

Intermittent Conditions in this section.

Notice:

• Fuel injection solenoid valve is internal to the fuel

injection pump assembly.

• PCU is part of the fuel injection pump assembly.

DTC P0215 (Symptom Code C) (Flash Code 52)
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls
Connector End Views or Engine Control Module (ECM)
Connector End Views

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 Tech 2.

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 Tech 2.

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 Diagnostic 

Aids