Fault Conditions

P1182

Long Term Fuel Trim Additive. Min Value, Air/Fuel Too Rich.







Fault symptoms
^ CHECK ENGINE.
^ Engine may stop straight after starting, run unevenly and misfire.

On-Board Diagnostics

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

Enable criteria:
^ Engine running and closed loop active. A multiplicative and an additive adaptation have been done.

Fault criteria:
^ Additive adaptation below -5 mg/c for more than 30 s.

Dependents:
^ P0116, P0117, P0118, P0131, P0132, P0134, P0444, P0445 and P1105.

System reaction to a fault:
^ None.

OK report:
^ Provided the fault criteria are not fulfilled during the driving cycle the OK report occurs at ignition off 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 degree 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: (For more information, Fault Handling II, Emission-Related Misfiring or Fault In Fuel System)

^ Type II.

Diagnostic help
The engine's fuel requirement has been 5 mg/c less during idling than control module has calculated using information from the mass air flow sensor.

Fault diagnosis first determines if the pressure sensors indicate about the same value with the ignition ON, as the mass air flow sensor is then compared with the intake air pressure. If the pressure sensors are OK but the mass air flow sensor value is not correct, then air leaks between the compressor and the throttle are checked for first and then the mass air flow sensor is changed.

If the air quantity is OK, then the fuel supply is checked, i.e. pressure, response, pump flow and finally the injectors.

Functions in the diagnostic tool related to the fault:
^ Additive adaptation, unit mg/c.
^ Closed loop, unit %.
^ Purge Adaptation, unit %.
^ Air mass deviation from calculated, unit %.

for more information refer to the description of readings, Menu Read Values

P0172