Control System WL-C Engine
Maintenance and Repair
MAF Sensor Learning Function
• The MAF learning procedure by means of M-MDS must be carried out at every service
interval. During this procedure the MAF learning is performed at engine speeds of
750 min
-1
, 1850 min
-1
, and 2500 min
-1
. To perform the procedure select ToolboxÆ
PowertrainÆEngine ChecksÆLearning and follow the instructions.
• The MAF learning procedure can also be initiated manually via DLC-1. Therefore,
connect terminal TEN (Test ENgine) five times to ground within five seconds. The glow
indicator light is illuminated while MAF learning is performed and flashes five times after
the procedure is completed.
Replacing the MAF Sensor
• After replacing the MAF sensor certain procedures have to be performed in the following
order:
1. Perform MAF sensor data reset procedure to reset the adaptation values in the PCM
for the MAF sensor. Therefore, select the option ToolboxÆPowertrainÆData
ResetÆMAF sensor and follow the instructions.
2. Perform KOEO self-test procedure.
3. Turn the engine switch to the OFF position.
4. Wait for 5 s.
5. Start the engine.
6. Perform KOER self-test procedure.
7. Turn the engine switch to the off position.
NOTE: It is recommended to perform the MAF sensor learning function when a MAF data
reset has been carried out.
01-54 Service Training BT-50
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