Test Point 3

TEST POINT 3
Speed

Note:
In the Actual Values menu item of the PST 2, the current values of the following parameters can be read out and checked.

- Ignition on

- Engine off

PST 2 display: 0 rpm

- Engine idling

PST 2 display: Tester display approximately equal to engine speed in rpm

Troubleshooting

- Switch off ignition

- Pull off plug II on the instrument cluster

- Engine idling

- measure the voltage between instrument cluster plug II, pin 15 and ground (AC range)

Display: > 1 Volt

- Disconnect plug on DmE control module (mE 5.2) or

- Disconnect plug IV on DmE control module (mE 7.2)

- Switch ignition on

- measure the voltage between instrument cluster plug II, pin 15 and ground

Display: 0 Volts

- Ohmmeter on instrument cluster plug II, pin 15 and plug on DmE control module (mE 5.2) pin 80 or mE 7.2 plug IV, pin 17.

Display: < 5 ohms

See also:
Drive Links / Tachometer Drive Links