P0302

P0302 00

Misfiring, Cylinder 2.







Fault symptom
- Check Engine
- (Check Engine lamp flashes if diagnostics has detected a misfire that is harmful to the catalytic converter).
- Uneven running and misfiring.

On-board diagnosis

Type of diagnosis:
- Continuous
- Each misfire is registered and evaluated two different ways depending on the type of misfire.

Test 1
- Affects emissions.

Test 2
- Harmful to the catalytic converter.

Enable criteria:

General conditions for this DTC
- Positive engine torque (negative torque = engine braking).
- Combustion signals from CDM are registered.

Test 1
- Total number of combustion signals registered.

Test 2
- The number of times no combustion signal is sent is tallied per cylinder every 200 engine revolutions. The total number of permissible misfires per 200 revolutions is indicated in a load and rpm-dependent matrix.

Fault criteria:

Test 1
- Total number of missing combustion signals more than 3%.

Test 2
- The number of times there was no combustion exceeds the number of permissible misfires.

Dependent:
P1312, P1315, P1341, P1342, P1343, P1344

System reaction to a fault:
- None

OK report:
- OK report occurs during ignition off, if no Fault report has been made during the driving cycle.

Fault handling:

Test 1
- Type II
- (See section Fault handling II, "Emission-related misfiring or fault in fuel system" for more information.)

Test 2
- Type I
- (See section Fault handling I, "Catalyst damaging misfiring" for more information).

Checking the wiring harness
- Move the wiring harness at several spots and in several directions to reveal intermittent breaks and short-circuits. Check switches, connectors and crimp connections for oxidation, retracted pins and pin clamping force.

Diagnostic help

Diagnosis regards:
- Fuel/air mixture too rich or too lean, insufficient compression, poor spark plugs causing incomplete combustion.

Functions in the diagnostic tool related to the fault:

Test value:
- Misfire Cyl 2
- Airmass Deviation from Calculated
- Additive Adaptation
- Multiplicative Adaption

Activation:
- Reset Misfire Counters
- Injector 2
- Ignition coil 2
- Fuel Pump
(See also description of readings/activations in diagnostic tool)