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dk1: Service Code 26: Check VAM for Contamination and Freedom of Movement
Steps _Key Off, wait 10 seconds
_Remove air cleaner element and check for contamination (oil residue, foreign material, etc.) that may impede VAF sensor vane movement and service as necessary.
Result Was service Code 26 present in Key On Engine Off Self-Test?
Direction YES

Replace VAM. Reinstall air cleaner. Rerun Quick Test


GO to Continue

Notes Code 26 indicates the vane airflow input to the processor is out of engine off (0.15 - 0.50 volts) or engine idle limits (1.50 - 2.70 volts). There have been no opens or shorts in the VAF circuit or a Code 56 (signal always high) or 66 (signal always low) would have been generated.

VAM Information:
ComponentVane Airflow Meter
DescriptionThe VAM measures air flowing into the engine. The meter contains a movable vane directly connected to a potentiometer.

Air, rushing through the VAM, changes the position of the vane and the potentiometer.

The potentiometer relays vane position information to the EEC. The EEC can then translate vane position information into the volume of air flowing into the engine

The VAM also contains an air temperature sensor. The sensor constantly monitors the temperature of the air flowing into the engine and reports the information to the EEC.

The EEC computes volumetric airflow and air temperature, then adjusts the fuel flow to obtain the optimum air/fuel ratio.
LocationMounted between the air cleaner and turbo inlet
Wire ColorsWhite with Black stripe
Light Green with Purple stripe
Orange with White stripe
Black with White stripe