dk30: Service Code 76: Check for Voltage Increase in VAF Signal During Dynamic Repsonse
| Steps | _Key Off, wait 10 seconds
_Disconnect 60 pin connector. Inspect for damaged pins, corrosion, loose wires, etc. Service as necessary. _Breakout box installed _Processor connected _DVOM on 20 volt scale _Connect DVOM to Test Pin 43 (Test Pin 27 on 2.3L TC) and Test Pin 46 _Perform Engine Running Quick Test while monitoring DVOM _After dynamic response prompt code 1(0) operator does a brief WOT. DVOM should increase more than 2.0 volts from reading before WOT. _Observe service codes at end of test |
| Result | Did voltage increase more than 2.0 volts? |
| Direction | YES
GO to Continue NO Check air cleaner duct for obstruction. If OK, replace VAM |
| Component | Vane Airflow Meter |
| Description | The 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. |
| Location | Mounted between the air cleaner and turbo inlet |
| Wire Colors | White with Black stripe
Light Green with Purple stripe Orange with White stripe Black with White stripe |
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