928 Transverse Lock Valve

Fault, DTC

Possible causes, remedy, notes

For this purpose, disconnect the plug connection on the transverse lock solenoid valve (arrow). The transverse lock solenoid valve is located beneath the rear left wheel housing cover. Nominal value 2.„4 between the PINs on the valve block. Nominal value not OK: Replace the transverse lock solenoid valve.

4. Check that the valve relay is energized (voltage present at solenoid valves of ABS and PSD).

Connect all plugs and the relay for this purpose. Push back the protective tube on the transverse lock valve plug (in the wheel housing on the rear left).

Switch off the ignition, then switch it on again.

Battery voltage must be present at the black wire.

If no battery voltage is present: Continue with test point 13/DTC 34 (valve relay). Note testing instructions (see below).

If voltage is present, try replacing the PSD/ABS control unit (output stage defective).

Notes on testing

If a plug for the power supply to the solenoid valves (ABS or differential lock) is detached while the ignition is switched on, the valve relay is de-energized. Even if the plug is then reconnected, the relay will not be re-energized until the ignition has been switched off and on again.


Fault, DTC Possible causes, remedy, notes

Wiring between control unit and lateral acceleration sensor not in working order (discontinuity, short circuit to plus or short circuit to ground), or the lateral acceleration sensor itself is damaged. The following wiring is installed:

PIN 15 at control unit - PIN 3 at sensor

- Ground for sensor =

PIN 9 at control unit - PIN 1 at sensor

- Signal from sensor to control unit

(2.7 ±0.14 Volt with car in normal-load position) = PIN 34 at control unit - PIN 2 at sensor

1. Check power supply (approx. 5 Volt) at the sensor plug after detaching it, with the ignition switched on. PIN 1 (-) and PIN 3 (+).


The sensor is located under the left-hand seat.

Test point 2

Lateral acceleration sensor, short-circuit/ discontinuity DTC 12

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