Bosch Injector Iqa Code
Sinikka Curz
The fuel injectors are machined to very fine tolerances but because of individual characteristics such as friction, pressure drop, magnetic force, wear during service etc, very slight variations in flow can occur.
Slight difference between target flow and actual flow can occur due to high operating pressures.
Certain common rail diesel fuel injectors require calibration during manufacture or overhaul on a specialised diesel injection test rig to produce a data code relating to the characteristics of each individual injector. This data code may be referred.
This data code allows the engine control module to correct the pulse duration applied to each individual injector to maintain optimum performance. Fitment of replacement injectors will require the
new injectors to be coded to the engine control unit.
Injector coding classification type
Some earlier common rail injectors have no coding. And some Bosch and some Siemens/VDO injectors use a single code identification process for injectors called injector classification. This is a single digit code and for example, a 2008 Ford Mondeo could have injectors fitted that are class 6 or class 5. So, if you replaced the injectors and you are fitting a different class you need to tell the ECU this.
Some earlier Denso injectors do not have coding or classification. Instead, they have 2 extra pins on the injector and inside the is a resistor that has a value that matches the manufacturing tolerances of the injector.
As well as coding injectors now some vehicles may require a pilot injection learning done when the injectors are replaced or if the engine starts to get a diesel knock. Some vehicles will do this automatically and in some cases it will have to be done with the diagnostic tool.
Below we have set out some examples of Denso, Bosch, Delphi and Siemens common rail injectors and where you can find the calibration codes for each brand. These are generally found on the injector solenoid, or in the case of some Delphi injectors, found on the parts sticker located on the injector body.
Please note: We recommend coding your injectors BEFORE fitment to the vehicle. The vehicle ECU will accept the calibration codes before fitment and this will confirm the correct injector has been supplied. If the ECU does not accept the calibration code, it will indicate either an operator error in entering the code , or the injector is incorrect for the vehicle. Should the injector supplied be incorrect, the injector can be returned as they have not been fitted to the engine or run.
Common rail diesel fuel injectors require calibration, which describe the characteristics of each individual injector. Due to fine tolerances, it is impossible to produce injectors with the same characteristics. Calibration of the injectors serves to compensate these small differences in injection characteristics. Injector calibration code is used to specify injection parameters such as EM/EP, LL/ID, VL/FL, VE/PI, ISA and QS. These injector-specific parameters are encoded within the injector calibration code.
IQA Codes are entered into the ECM to improve control of the injected fuel quantity. The code applies over the entire programmed fuel map. The classification codes compensate for deviations in metered amounts, and make fuel quantity metering more precise. The adjustment codes also increase injector efficiency on the engine and improve emissions.
Various engine manufactures call them Trim Codes, Injector Calibration, Injector Flow Rate, Injector Classification Code, Injector Correction Code, Flow Rate Programming, and Injector Delivery Compensation. No matter what the OE calls them, IQA (Injector Quantity Adjustment) help emissions and drive ability.
Injector Quantity Adjustment codes are located in different locations on the injectors. Some rebuilt injectors will have IQA codes on the box or the bag it is packaged in. Be certain to note the code and the cylinder you installed the injector in, and enter them into the ECM.
If your scan tool has not been updated recently, you may run into an issue entering IQA codes, because the latest codes are not listed. We have also encountered the situations where the ECM has an update that must be performed, in order to enter the new codes.
Hello Dylan,
Some deleted software does not allow the IQA codes to be entered. We find only a minor difference, on Bosch injectors, in idle quality if the IQA codes were or were not entered. It sounds like you already had delete tuning, prior to the injector replacement? We find a large variance in tuning quality causing a noisy idle, or it could be the injectors causing the louder idle.
Thanks, Mark
Hi Eddie,
1. I assume your tune is for the CP3 pump in place of the CP4?
2. There is fuel supply side sensor, that will set a code if the vacuum exceeds 14 inches. Out of the system it should read zero and not affect you issue.
3. The engine would still start, even if the injectors are not coded, and some delete tunes do not have an option for entering the IQA codes.
4. The injectors have to have pressure on the return side to operate properly. You would need to go step-by-step through the no start section of our diagnostics. -repair/diesel-diagnostics-repair/chevy-gmc-diesel-diagnostics/#2011
5. Deleted tunes cover a lot of codes, and sometimes information you read with the scan tool is skewed. You may need to check a lot of data at each sensor, instead of the scan tool data.
Mark
Hi Mark,
I have an 2006 LBZ with EFI Live Auto cal DSP5. I put new injectors in and want to program the IQA codes into the ECM. Can this be done with the hand held Auto Cal or can I do it from my laptop. Also how do I get the codes into my system, how do I enter the numbers?? Thanks, Mike
Hi Mike,
You will not be able to enter the IQA codes with an AutoCal, you would need to use a scan tool to enter the codes. Note each code by cylinder number and have a repair shop or dealer enter the codes for you. It may run ok without entering the codes on that year range however, for a fine-tuned running condition, the codes should be entered.
Thanks, Mark
Hello Larry,
If the injectors are Bosch reman, they usually have the IQA codes imprinted on top of the injector. If they are aftermarket, then it would normally be on the box or tag. Without a code, the injectors would need a complete, after rebuild, test to determine what the code should be.
Mark
Hi Dennis,
There are no programming codes for the 2004.5-2007 5.9L injectors. We do not have an easy answer to the mileage issue without checking the vehicle to see if there are any other issues.
Thanks, Mark
I was a professional mechanic back in the day and am comfortable doing the needful for a more durable repair, but could use some guidance on likely best approach since my experience goes back a couple decades ago.
My plan is below, I'd appreciate any critique and I guess my main question is how to get the new calibration code into the onboard computer (ECM?) after replacing the injector, assuming that turns out to be necessary.
Clean injector with my hand-pump Bosch injector cleaner using injector pulser to open the valve and mineral spirits in the injector cleaner. This injector cleaner was originally designed for Bosch CIS injectors (MBZ, VW, etc.) but I think will do the job.
Using a CIS-style injector pump here is okay (as long as you watch the pressure) but is unlikely to do a thorough job of cleaning by itself. For that you need ultrasonic cleaning. This is shown in quite a few YouTube videos. Basically you pulse the injector (continuously) while the nozzle is submerged in an ultrasonic bath. Cleaning solution specs are sparse, but something like Simple Green or dilute Purple Power seems to be the idea.
You can't remove just one injector. Either all the fuel-rail o-ring seals are separated or all the injector seals are separated. So minimally you need four bottom and one top seal or four top and one bottom seal. Probably best to just figure on a whole set of seals top and bottom.
Calibration codes are for diesel injectors (a diesel power-plant is/was available on certain C-Max models, hence the search results). No calibration code entry is required for gasoline injectors when one is replaced.
Manufacturers have added injector coding into injectors to make it easier to adjust and comply with the ever-tightening emission regulations introduced since 2010. When fitting new injectors, you need to code them to signal the ECU to make appropriate calculations that will allow the engine to run the optimum performance compatible with the new injectors.
The industry standard injector code is the IMA coding (Injector Menge Abgleichung) by Bosch and Siemens. The codes typically consist of 6-24 alphanumeric characters depending on the type of the vehicle. Failure to apply the correct coding will result in engine performance inefficiencies, non-start, or poor or lumpy running.
Bosch Group built and launched a machine vision system in 2023 at its plant in Curitiba, Brazil, to verify serial codes engraved on injector nozzles used in diesel engines. It replaced a smart-camera based system.
The production process is highly automated at Bosch. At the start of the manufacturing process for the nozzles, an operator selects the specific parts to be produced and feeds the components into the automated manufacturing system. The system then produces and packages the nozzles.
This includes engraving serial numbers on the nozzles. However, capturing readable images of small, laser-engraved characters on a cylindrical surface can be difficult. And, depending on the metal, the contrast between the characters and the metal surrounding them can be minimal, compounding the challenges in capturing and reading numeric information.
The old optical character recognition (OCR) and optical character verification (OCV) system at Bosch was not up to the task. It produced too many false rejects. So, Bosch hired LumiVision (Pinhais, Paran, Brazil), a systems integrator, to improve these results with a new vision system.
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