P0313

P0313 00

Misfiring Detected at Low Fuel Level







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 breaking).
- Combustion signals from CDM are registered.
- Fuel level below 5 litres.

Test 1
- Total Number of combustion signal 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 no combustion signal was sent exceeds the number of permissible misfires. More than one cylinder has misfired.

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 Description of On-Board Diagnostics/Fault handling II, "Emission-related misfiring or fault in fuel system" for more information.)

Test 2
- Type I
- (See Description of On-Board Diagnostics/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 1
- Misfire Cyl 2
- Misfire Cyl 3
- Misfire Cyl 4
- Airmass Deviation from Calculated
- Additive Adaptation
- Multiplicative Adaption

Activation:
- Reset Misfire Counters
- Injector 1
- Injector 2
- Injector 3
- Injector 4
- Ignition coil 1
- Ignition coil 2
- Ignition coil 3
- Ignition coil 4
- Fuel Pump