Isuzu KB P190. Manual - part 421

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-67

Remove the rubber hoses from the leak-off
pipes that are connected to each fuel injector.

Crank over the engine while observing the fuel
leak from the leak-off pipe of each fuel injector
(very small leak is normal).

Important: Safety glasses must be worm. Fuel
may splash if the fuel injector is faulty.

Important: Replacement fuel injector must be
programmed.

Replace the fuel injector(s) that return fuel is
excessive. Refer to Fuel Injector
Replacement/ Fuel Injector ID Code Data
Programming.

Retest after replacement of the fuel injector(s).

Did you find and correct the condition?

—

Go to Step 12

Go to Step 7

Remove each glow plug from the cylinder
head.

Inspect for fuel leakage into the combustion
chamber.

Is there a cylinder that fuel leakage into the
combustion chamber?

—

Go to Step 9

Go to Step 10

Important: Replacement fuel injector must be
programmed.
Replace the appropriate fuel injector that does not
create a clicking noise (solenoid operating noise),
contains an interrupted noise or abnormal noise at
Step 1. Refer to Fuel Injector Replacement/ Fuel
Injector ID Code Data Programming.

Did you complete the replacement?

—

Go to Step 12

—

Important: Replacement fuel injector must be
programmed.
Replace the appropriate fuel injector that was
leaking fuel found at Step 7 and inspect the engine
mechanical for any damage or poor engine
compression. Refer to Fuel Injector Replacement/
Fuel Injector ID Code Data Programming and
engine mechanical section.

Did you complete the replacement?

—

Go to Step 12

—

Important: The fuel supply pump must be timed to
the engine and adjustment value must be learned
to the ECM.
Notice: Always replace the fuel filter cartridge
when a fuel supply pump is replaced.
Replace the fuel supply pump and fuel filter
cartridge. Refer to Fuel Supply Pump Replacement
and Fuel Filter Cartridge Replacement.

Did you complete the replacement?

—

Go to Step 12

—

Replace the pressure limiter valve. Refer to Fuel
Rail Replacement.

Did you complete the replacement?

—

Go to Step 12

—

Step

Action

Value(s)

Yes

6E-68 ENGINE CONTROL SYSTEM (4JK1/4JJ1)

Reconnect all previously disconnected
harness connector(s).

Turn OFF the ignition for 30 seconds.

Attempt to start the engine.

Does the engine start and continue to run?

—

Go to Step 13

Go to Step 1

Observe the DTC Information with a scan tool.

Are there any DTCs that you have not diagnosed?

—

Go to DTC List

System OK

Step

Action

Value(s)

Yes

ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-69

DTC P0016 (Flash Code 16)

Circuit Description

The crankshaft position (CKP) sensor is located on the
left-hand of the cylinder block rear and it is behind the
starter motor. The sensor rotor is fixed on the
crankshaft. There are 56 notches spaced 6

° apart and

a 30

° section that is open span. This open span portion

allows for the detection of top dead center (TDC).
The camshaft position (CMP) sensor is installed on the
timing chain sprocket cover at the front of the camshaft
idle gear. The CMP sensor detects total of five
projections per one engine cycle (four projections
arranged equally every 90

° and one reference

projection on the timing chain sprocket surface).
Detecting the open span portion from the CKP sensor
and one reference projection from the CMP sensor, the
ECM determines cylinder #1 compression TDC to
ensure they correlate with each other. If the ECM
detects both signals are out of synchronization, this
DTC will set.

Condition for Running the DTC

• DTCs P0335, P0336, P0340 and P0341 are not

set.

• The battery voltage is more than 9 volts.

• The ignition switch is ON.

• The CKP sensor signal pulse is detected.

• The CMP sensor signal pulse is detected.

Condition for Setting the DTC

• The ECM detects that the CKP sensor signals and

CMP sensor signals are out of synchronization
during engine rotations.

Action Taken When the DTC Sets

• The ECM illuminates the SVS lamp when the

diagnostic runs and fails. Refer to DTC Type
Definitions for Action Taken When the DTC Sets -
Type C. (Euro 4 Specification)

• The ECM illuminates the MIL when the diagnostic

runs and fails. Refer to DTC Type Definitions for
Action Taken When the DTC Sets - Type A.
(Except Euro 4 Specification)

Condition for Clearing the DTC

• Refer to DTC Type Definitions for Condition for

Clearing the SVS Lamp/ DTC - Type C. (Euro 4
Specification)

• Refer to DTC Type Definitions for Condition for

Clearing the MIL/ DTC - Type A. (Except Euro 4
Specification)

Diagnostic Aids

• This DTC is caused by an incorrect mechanical

timing condition, which is most likely caused by
wrong installation of timing gear or chain.

• The engine reverse rotation may set this DTC.

Circuit/ System Testing DTC P0016

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 a scan tool.

Turn OFF the ignition for 30 seconds.

Start the engine. If the engine does not start,
crank over the engine for 10 seconds.

Monitor the DTC Information with a scan tool.

Is DTC P0335, P0336, P0340 or P0341 also set?

—

Go to Applicable

DTC

Go to Step 3

6E-70 ENGINE CONTROL SYSTEM (4JK1/4JJ1)

Inspect the crankshaft position (CKP) sensor
and the camshaft position (CMP) sensor for
the following conditions:

• Physical damage of sensor

• Loose or improper installation of sensor

• Excessive air gap

• Foreign material passing between sensor

and sensor rotor or chain sprocket

• Physical damage of sensor rotor or chain

sprocket

• Loose or improper installation of sensor

rotor or chain sprocket

Inspect the engine mechanical timing for the
following conditions:

• Incorrectly installed timing gear or chain

• Faulty timing chain tensioner

• Excessive play in the timing chain

• Timing chain that jumped teeth

Repair or replace as necessary.

Did you complete the repair?

—

Go to Step 4

—

Reconnect all previously disconnected
harness connector(s) if disconnected.

Clear the DTCs with a scan tool.

Turn OFF the ignition for 30 seconds.

Start the engine. If the engine does not start,
crank over the engine for 10 seconds.

Operate the vehicle within the Conditions for
Running the DTC. You may also operate the
vehicle within the conditions that you
observed from the Freeze Frame/ Failure
Records.

Did the DTC fail this ignition?

—

Go to Step 2

Go to Step 5

Observe the DTC Information with a scan tool.

Are there any DTCs that you have not diagnosed?

—

Go to DTC List

System OK

Step

Action

Value(s)

Yes

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