Conditions

Random Misfire Detected. Catalyst Damaging. Fuel Level Low.





Fault symptoms
- Market US/CA: CHECK ENGINE
- Running unevenly and misfiring.

On-Board Diagnostics

Type of diagnosis:
- Continuous. But interrupted when fault criteria fulfilled and will not restart until next driving cycle.

Enable criteria:
- General conditions for this trouble code: Atmospheric pressure must exceed 72 kPa and the engine coolant and intake air temperature must exceed -7 °C.
- Engine started. Fuel level below 4 liters. Main relay voltage exceeding 10V. Ignition discharge module combustion signals registered. The number of missing combustion signals is accumulated for each cylinder during 200 engine revolutions. The total number of accepted misfires during 200 engine revolutions is specified in a load and engine speed-dependent matrix.

Fault criteria:
- Number of missing combustions exceeding number of accepted misfires. More than one cylinder has misfired.

Dependents:
- P1313 and P1324.

System reaction to a fault:
- Under high engine loads, closed loop will be blocked while misfiring occurs.

OK report:
- Under the condition that the fault criteria is not fulfilled during the driving cycle the OK report occurs at ignition before the engine stalls. Two types of OK reports can be given: Type 1: If a DTC is already stored for the diagnosis and similar operating conditions have occurred (coolant temperature above or below 71 °C, engine speed 375 rpm and load 10%). Type 2: If there is no DTC stored for the diagnosis or similar operating conditions have not occurred

Fault handling: Fault Handling I, Catalyst Damaging Misfiring
- Type I.

Diagnostic help
If any other trouble codes have been generated, check whether fault diagnosis should start with them. Drive the car in the load and engine speed range shown by Freeze Frame. If the engine does not misfire, the trouble code was probably due to the fuel level being too low. Drive the car so that the catalyst diagnosis is performed. If necessary, change the catalytic converter.
If the engine misfires during test driving, conduct a general inspection of connectors and hoses, and then a thorough check of compression, ignition and fuel system.

Diagnostic tool functions related to this fault are:
- Diagnostic status for the diagnosis.
- Misfire Cyl 1
- Misfire Cyl 2.
- Misfire Cyl 3
- Misfire Cyl 4.
- Misfire Cyl 5.
- Misfire Cyl 6.
- Multiplicative adaptation, unit %
- Additive adaptation, unit mg/c.
- Short term fuel trim, unit %.
- Purge adaptation, unit %.
- Airmass deviation from calculated, in %.
- Activation of misfire counter resetting.
- Activation of ignition trigger.
- Activation of injector test.
- Activation of pump test.

See also the description of activating functions under "Fault diagnosis, general" for more information.
Tech 2 Menu Structure, DTC Menu, Read Value, Activate, Sys Info

Check the wiring
Jiggle the leads and in-line connectors at various points and in different directions to detect any intermittent breaks or short circuit in the wiring. Observe the multimeter, test lamp or diagnostic tool while doing this.

Proceed to Diagnostic Procedures Readout of Freeze Frame For P1390