IQA (Injector Quantity Adjustment) means adjusting fuel injection quantity difference between injectors which occurs inevitably at manufacturing process as allotting serial number consists of 7 letters to each injectors.Inputting IQA code of injectors installed in each cylinder to ECM, ECM recognizes the fuel injection quantity difference between each injectors. ECM adjusts every injector to have same fuel injecting characteristic as recognizing specific fuel injection map which is different for each serial number.

P1670 is set when 'IQA read or write error' occurs in EEP ROM where IQA data is saved. This code is due to incorrect input of IQA code to ECM.

1.

Check injector class input state

(1)

IG KEY "OFF", ENGINE "OFF".

(2)

Using Scantool, select "ENGINE CONTROL" - "INJECTOR CORRECTION".

(3)

Check currently inputted "injector class input state".

Specification : IQA data inputted to ECM should be identical with IQA data of injector.

(4)

Are both data identical?

▶ Go to "Verification of Vehicle Repair".

▶ If error is not corrected after reperforming "INJECTOR CORRECTION" procedure, replace ECM.

note

Input IQA data of injector mounted at cylinder at replacing ECM using scantool.

Enter the driving distance - how many km the CPF is used- into New ECM with scanner.

For immobilizer applied vehicle, input pin code.

If this process is not performed, engine check lamp on cluster blinks and normal engine power generation is impossible.

After a repair, it is essential to verify that the fault is corrected.

5.

Are any DTCs recorded ?

▶ Go to the DTC guide of recorded NO. in Scantool.

▶ System operates within specification.