| Checking engine speed sender -G28- |
| The engine speed sender -G28- is both a speed sender and a reference mark sender. If it fails the engine will run with reduced power (torque limitation). |
| On vehicles with manual gearbox the engine speed sender -G28- registers six notches in the flywheel. |
| On vehicles with automatic gearbox it registers six metal pins on the torque converter plate. |
| Because the sender employs a different scanning method in each case (notches on vehicles with manual gearbox and pins on automatics), the form of the signal is inverted. |
| However, to ensure that the signal received by the engine control unit is always in the same form, the engine speed senders -G28- on vehicles with manual gearbox are wired the opposite way round compared with those used on automatics. |
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| Disconnect connector from engine speed sender -G28- ⇒ Fitting locations overview, → Chapter. |
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