0300

[1] Misfiring detection: The number of misfirings is too high.


Possible cause:

- Misfiring
Affected functions:

- Engine running

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Test 1: Check system 'Misfiring'.

1. Check system 'Misfiring'.

Test 1.1: Low fuel grade

Test 1.2: Check compression pressure.

Test 1.3: Quantity correction values of smooth-running control

1.1. Low fuel grade

1.1. No further information available.


1.2. Check compression pressure.
Test of compression
Test prerequisite

- Ignition ON
- Engine not running
NOTE RE Test of compression

- As of an rpm difference greater than 7 1/min between the lowest and the highest value, a mechanical compression test and cylinder leak test must be performed on all cylinders to locate the fault.
Continue to test with button F2

Warning!Communication with ECU required.


1.3. Quantity correction values of smooth-running control

Test 1.3.1: Test prerequisite : Test of compression

Test 1.3.2: Test prerequisite : Adjustment of injector injection quantities

Test 1.3.3: Quantity correction values of smooth-running control ( Idling speed )

1.3.1. Test prerequisite : Test of compression
Test of compression
Test prerequisite

- Ignition ON
- Engine not running
NOTE RE Test of compression

- As of an rpm difference greater than 7 1/min between the lowest and the highest value, a mechanical compression test and cylinder leak test must be performed on all cylinders to locate the fault.
Continue to test with button F2

Warning!Communication with ECU required.


1.3.2. Test prerequisite : Adjustment of injector injection quantities
NOTE :The adjustment of injector injection quantities must be performed when replacing injectors.After replacing one or several injectors, the corresponding adjustment values of the injectors replaced must be recorded in the control module for the specific cylinder.The 7 digits marked with a circle represent the adjustment value.Warning!Warning:Use the adjustment values printed on the injectors when coding the injectors.The adjustment values printed on the engine sticker are not to be used.Communication with ECU required







1.3.3. Quantity correction values of smooth-running control ( Idling speed )
Test prerequisite

- Engine at idle
- Test of compression OK
- Adjustment of injector injection quantities OK
Important notes

- In the case of complaints related to a cold start or to the warm-up phase, do not bring the engine to operating temperature, but proceed as appropriate for the complaint.
- Injector classification must be performed following every injector exchange.(Control unit adaptations/Adjustment of injector injection quantities)
Communication with ECU required