Isuzu N-Series. Manual - part 759

Engine Control System (4JH1) 6E-87

Turn OFF the ignition.

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

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

Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

—

Go to Step 5

Go to Step 4

Turn OFF the ignition.

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

Turn ON the ignition, with the engine OFF.

Is the DMM voltage more than the specified value?

10 volts

Go to Step 7

Go to Step 6

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 ground.

Repair the circuit(s) as necessary.

Did you find and correct the condition?

—

Go to Step 11

Go to Step 10

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 an open circuit or high
resistance.

Repair the circuit(s) as necessary.

Did you find and correct the condition?

—

Go to Step 11

Go to Step 8

Turn OFF the ignition.

Inspect for an intermittent, for a poor
connection and corrosion on the ESO
solenoid valve control signal circuit at the
harness connector of the PCU (pin 5 of E-110
connector).

Repair the connection(s) as necessary.

Did you find and correct the condition?

—

Go to Step 11

Go to Step 9

Turn OFF the ignition.

Disconnect the ECM harness connector.

Inspect for an intermittent and for a poor
connection on the ESO solenoid valve control
signal circuit at the harness connector of the
ECM (pin 105 of B-233 connector).

Repair the connection(s) as necessary.

Did you find and correct the condition?

—

Go to Step 11

Go to Step 10

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 11

—

Step

Action

Value(s)

Yes

6E-88 Engine Control System (4JH1)

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 11

—

Reconnect all previously disconnected
harness connector(s).

Clear the DTCs with the Tech 2.

Turn OFF the ignition for 30 seconds.

Start the engine.

Monitor the DTC Information with the Tech 2.

Turn OFF the engine.

Does the DTC fail this ignition before the ECM
turns OFF?

—

Go to Step 3

Go to Step 12

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

Engine Control System (4JH1) 6E-89

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 Tech 2.

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

Did you perform the Diagnostic System Check –
Engine Controls?

—

Go to Step 2

Go to Diagnostic

System Check –

Engine Controls

Install the Tech 2.

Turn OFF the ignition for 30 seconds.

Start the engine and let idle for 30 seconds.

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

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

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

—

Clear the DTCs with the Tech 2.

Turn OFF the ignition for 30 seconds.

Start the engine and let idle for 30 seconds.

Monitor the DTC Information with the Tech 2.

Turn OFF the engine.

Does the DTC fail this ignition before the ECM
turns OFF?

—

Go to Step 3

Go to Step 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

6E-90 Engine Control System (4JH1)

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 Tech 2.

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. Refer to air
bleeding procedure in Fuel System Section.

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

Step

Action

Value(s)

Yes

Did you perform the Diagnostic System Check –
Engine Controls?

—

Go to Step 2

Go to Diagnostic

System Check –

Engine Controls

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