0630

Misfiring (P0300)


Possible cause:

- Smooth engine running
Affected functions:

- Engine diagnosis
- Engine running

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Test 1: Check smooth engine running.

1. Check smooth engine running.

Test 1.1: Test fuel pressure and delivery of component M3 (Fuel pump).

Test 1.2: Check self-adaptation of mixture formation. ( Check by means of actual values )

Test 1.3: Check water and diesel content in gasoline fuel. (Fuel quality)

1.1. Test fuel pressure and delivery of component M3 (Fuel pump).

1.1. No further information available.


1.2. Check self-adaptation of mixture formation. ( Check by means of actual values )
Warning!Communication with ECU required.


1.3. Check water and diesel content in gasoline fuel. (Fuel quality)
Safety note
Warning!Risk of explosion, poisoning and injury!Fuels are highly inflammable and toxic if inhaled. Fuels may cause skin damage. fuel vapors are explosive, invisible and spread out at floor level, they are toxic if inhaled and produce giddiness and an anaesthetizing effect.Rules of conduct and protective measures

- Wear suitable protective clothing.
- Pay attention to national safety precautions and regulations.
- No fire, sparks, naked flames and smoking.
- Ensure the work place is adequately ventilated.
- Never drain or pour in fuels over assembly pits.
- Store drained fuel in a suitable and sealed vessel.
- Immediately eliminate any fuel which has flowed out.
First-aid measures

- Clean moistened skin with water and soap.
- Change moistened clothing as quickly as possible.
- If fuel gets into your eyes, rinse out your eyes immediately with water and contact a doctor if necessary.


Check water and diesel content in gasoline fuel. (Fuel quality)
Figure legend

- 55Measuring beaker(Min.:1 Liters)
- 69Pressure hose(119 589 04 63 00)
Test sequence

- Switch off ignition.
- Connect test pressure gauge.
- Hold the open fuel line in measuring beaker (55).
- Switch on ignition.
- Actuate component M3 (Fuel pump).
- Drain off about 0.3 l fuel.(Press key F4 in order to end actuation.)
Call up 'Actuation' with key F2 .







Warning!Communication with ECU required.