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Hall Effect
Sensor (G40)
On the 3B engine, the hall effect sensor (G40) is located
in the distributor. The signal provided by G40 is used by the ECU to :
- Determine the ignition firing point for cylinder #1
when the engine is first cranked
- Determine fuel injection timing and sequencing
- Create a reference point for signals from knock
sensors G61 & G66
If G40 fails, the engine cannot be restarted (as the ECU
needs a reference firing point for #1).
However, if G40 fails while the engine is
running, it will continue to run by deriving the firing points from signals
received from G4 and G28. In addition, the ECU will retard the ignition by 6
degrees as a safety measure.
| Application |
3B |
| Audi Part Number |
034 998 065 |
| Bosch Part Number |
??? |
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