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Injector Coding: Performance

The document discusses the importance of injector coding for vehicle performance and operation. Injector coding ensures the ECU knows each injector's tolerance levels so it can adjust fuel delivery accordingly. When injectors are replaced, their unique codes must be entered into the ECU so it can optimize fueling. Failure to do so can cause issues like poor performance, unstable idle, knocking, and check engine lights due to incorrect fuel injection.

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Lekhooa Lekhooa
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4K views1 page

Injector Coding: Performance

The document discusses the importance of injector coding for vehicle performance and operation. Injector coding ensures the ECU knows each injector's tolerance levels so it can adjust fuel delivery accordingly. When injectors are replaced, their unique codes must be entered into the ECU so it can optimize fueling. Failure to do so can cause issues like poor performance, unstable idle, knocking, and check engine lights due to incorrect fuel injection.

Uploaded by

Lekhooa Lekhooa
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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DENSO: Injector Coding

Injector
Coding
The purpose of injector coding the following issues.
is to ensure that the ECU knows
the injectors tolerances, so that
Performance
it can adjust fuel quantity offsets In some vehicles, if the
accordingly into its base map. coding is not done right,
the car can be driven away, but
When an injector goes through the OE QR Code
the driver will notice performance
test, it generates a unique code which
issues at times of need and also fuel
identifies the injector tolerance range of Injector code
consumption could be very high due
the needle and also nozzle assembly fit.
to incorrect coding known to ECU.
This process enables the ECU to vary the
This can result in excessive black have just been replaced.
fuelling accordingly and optimises the
smoke under heavy acceleration. This will result in poor
performance of the engine.
performance, unstable
Denso injectors all require coding done No Start / Unstable Idle idle (hunting idle). The
correctly (some earlier releases may Mostly in the newer diesel systems, ECU will retard all timing
not need to be coded). The typical it’s almost vital to code the injectors due to incorrect injection
length of the code for each injector will correctly using the correct process or and underload will put the
be between 16 and 24 alphanumeric the result will be unstable idle of the vehicle into Limp Mode.
characters depending on vehicle type.
The code will be found on the injector
vehicle. The vehicle will struggle to Knocking Noise
keep idle RPM and be hard to start.
connector head and usually will be If the injector/s have not
accompanied with a QR Code for easy Poor or Hunting Engine been coding properly, then
scanning if your workshop has a QR code If the injectors are not coded into the driver will complain
reader. the ECU, then the ECU will inject fuel about poor performance. A
according to the old coding which technician will also be able
When the injectors are not coded into the
would belong to the injectors that to hear a knocking noise
ECU properly, the vehicle may encounter
coming from the engine
which is an indication of
an injector not injecting
correct quantity or at the
right time.

MIL Light ON
Whenever the ECU can’t compensate
or deems a certain amount of
compensation as a fault, the ECU will
illuminate the MIL light on the dash.
Hopefully, the driver takes the vehicle to
a workshop ASAP, so no further damage
is done to the engine.

A compatible scan tool is required to


code injectors to the ECU.
These are the injector codes that are stored in the vehicles ECU. These
codes can be found on the top of each injector and must be entered For technical support or further
manually with a compatible scan tool for the engine to perform correctly. information go to:
www.denso.com.au

4820 Tech Talk – January / February 2020

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