Adaption Faults
Adaption FaultsWhen faults arising in the LH 2.4 system can be classed as "adaptation faults", the car must be run for about 10 minutes to prevent the same fault codes recurring after the fault has been rectified. This is because the system always endeavors to compensate for any changes that can affect its performance in one way or another.
When the system compensates for values that are outside the permitted limits, a fault code is generated. After the fault codes have been read and any faults rectified, the fault codes generated by the adaptive function of the system when compensating for the faults will remain in the memory. Such codes cannot be cleared until the system has been readapted to new compensation parameters.
It takes the system a certain amount of time to readapt to these new compensation parameters, depending on the type of fault concerned. However, driving the car for ten minutes with the engine at normal operating temperature is long enough for the system to re-adapt itself.
The following fault codes are affected by this adaptive function:
12223,12224 and 12225 (Lambda sensor signal / preheating)
12111 and 12112 (Lambda adaptation faults)
12113 and 12114 (IAC adaptation faults)
Occasional (intermittent) faults
Intermittent faults of a serious nature will cause the Check ENGINE lamp to light up at times when the fault occurs. When the fault disappears temporarily, the CHECK ENGINE lamp will go out but the relevant fault code will remain stored in the memory.