TESTING

1991–94 Vehicles

1. Remove the sensor and position on a level surface.
2. Connect an ohmmeter between the terminal of the sensor and verify there is continuity.

   Fig. 1: G–sensor inspection — checking for continuity of sensor while on flat surface

3. Tilt the sensor slowly 30 degrees in the direction of vehicle travel and verify the ohmmeter reads infinity.
4. Tilt the sensor slowly 30 degrees toward the rear of the vehicle and verify the ohmmeter reads infinity.

   Fig. 2: G–sensor inspection — checking for no continuity of sensor while inclined at angle greater than 30 degrees

5. If not as specified, replace the G sensor.

1995–98 Vehicles

1. Detach the G-sensor connector, then connect the test harness set MB991348, or equivalent, between the terminals of the detached connector.
2. Turn the ignition switch ON and take a reading of the output voltage between terminals 2 and 3. The reading should be 2.4–2.6 volts.

   Fig. 3: Connect a test harness set between the sensor and an ohmmeter

3. With the special tool still connected, secure the G-sensor so that the front mark on the sensor mounting surface is facing straight down, then take a reading of the output voltage between terminals 2 and 3. The reading should be 3.3–3.7 volts.

   Fig. 4: Position the G-sensor with the front mark on the mounting surface facing straight down, then take a voltage reading

4. If the voltage is outside the standard value, after checking to be sure the wiring is operating properly, replace the G-sensor.