If a customer complains about the above problem, this could be caused by the injectors. In addition, the following fault codes may be stored:
P0201 Injection valve circuit malfunction, cylinder 1
P0202 Injection valve circuit malfunction, cylinder 2
P0203 Injection valve circuit malfunction, cylinder 3
P0204 Injection valve circuit malfunction, cylinder 4
Very irregular engine running and poor starting performance may also be among the complaints. In this case, the injectors should be checked. Use a suitable diagnostic tester, to display the parameters, such as quantity correction comparison, injection timing BTDC, injection duration, and injection quantity. Compare actual against target values. If the measurements reveal unacceptable deviations, the defective injectors must be replaced. As each new injector has its own "classification code'' has (see Figure 1), they must be input in the ECU after the injectors have been replaced. This can be done in the 'Injector adjustment' menu. As part of this, the fuel filter and the return lines should also be replaced.
Important safety note
Technical information and practical tips have been compiled by HELLA in order to provide professional support to vehicle workshops in their day-to-day work. The information provided on this website is intended for use by suitably qualified personnel only.
Reprinting, distribution, reproduction, exploitation in any form or disclosure of the contents of this document, even in part, is prohibited without our express, written approval and indication of the source. The schematic illustrations, pictures and descriptions serve only for the purposes of explanation and representation of the instructions and cannot be used as a basis for installation or assembly work. All rights reserved.
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