SAAB WIS ONLINE

DTC 56 DETECTION OF G SENSOR STICK

DTC 56 DETECTION OF G SENSOR STICK

DIAGNOSIS:

Faulty G sensor output voltage

TROUBLE SYMPTOM:

ABS does not operate.

WIRING DIAGRAM:


CHECK ALL FOUR WHEELS FOR FREE TURNING.

Have the wheels been turned freely such as when vehicle is lifted up, or operated on a rolling road?

Yes

The ABS is normal. Erase the DTC.


No


CHECK OUTPUT OF G SENSOR USING Vehicle Diagnostic Interface.

Select “Current data display & Save” on the Vehicle Diagnostic Interface.

Read the Vehicle Diagnostic Interface display.

Is the G sensor output on monitor display −1.25 — 1.25 m/s when the vehicle is in horizontal position?

Yes


No


CHECK OUTPUT OF G SENSOR USING Vehicle Diagnostic Interface.

Turn the ignition switch to OFF.

Remove the console box.

Remove the G sensor from vehicle. (Do not disconnect the connector.)

Turn the ignition switch to ON.

Select “Current data display & Save” on the Vehicle Diagnostic Interface.

Read the Vehicle Diagnostic Interface display.

Is the voltage 8.7 — 11.3 m/s when G sensor is inclined forwards to 90°?

Yes


No

Replace the G sensor.


CHECK OUTPUT OF G SENSOR USING Vehicle Diagnostic Interface.

Read the Vehicle Diagnostic Interface display.

Is the voltage −11.25 — 8.75 m/s when G sensor is inclined backwards to 90°?

Yes


No

Replace the G sensor.


CHECK POOR CONTACT IN CONNECTORS.

Turn the ignition switch to OFF.

Is there poor contact in connector between ABSCM&H/U and G sensor?

Yes

Repair the connector.


No


CHECK ABSCM&H/U.

Connect all connectors.

Erase the memory.

Perform the inspection mode.

Read out the DTC.

Is the same DTC as in current diagnosis still being output?

Yes

Replace the ABSCM&H/U.


No


CHECK ANY OTHER DTC APPEARANCE.

Are other DTCs being output?

Yes

Proceed with the diagnosis corresponding to DTC.


No

A temporary poor contact.


CHECK OPEN CIRCUIT IN G SENSOR OUTPUT HARNESS AND GROUND HARNESS.

Turn the ignition switch to OFF.

Disconnect the connector from ABSCM& H/U.

Measure the resistance between ABSCM&H/U connector terminals.

Connector & terminal

(B301) No. 10 — No. 21:

Is the resistance 5.0 — 5.6 kΩ?

Yes


No

Repair the harness/connector between G sensor and ABSCM&H/U.


CHECK G SENSOR.

Remove the console box.

Remove the G sensor from vehicle.

Connect the connector to G sensor.

Connect the connector to ABSCM&H/U.

Turn the ignition switch to ON.

Measure the voltage between G sensor connector terminals.

Connector & terminal

(B292) No. 2 (+) — No. 3 (−):

Is the voltage 2.1 — 2.5 V when G sensor is in horizontal position?

Yes


No

Replace the G sensor.


CHECK G SENSOR.

Measure the voltage between G sensor connector terminals.

Connector & terminal

(B292) No. 2 (+) — No. 3 (−):

Is the voltage 3.7 — 4.1 V when G sensor is inclined forwards to 90°?

Yes


No

Replace the G sensor.


CHECK G SENSOR.

Measure the voltage between G sensor connector terminals.

Connector & terminal

(B292) No. 2 (+) — No. 3 (−):

Is the voltage 0.5 — 0.9 V when G sensor is inclined backwards to 90°?

Yes


No

Replace the G sensor.


CHECK ABSCM&H/U.

Turn the ignition switch to OFF.

Connect all connectors.

Erase the memory.

Perform the inspection mode.

Read out the DTC.

Is the same DTC as in current diagnosis still being output?

Yes

Replace the ABSCM&H/U.


No


CHECK ANY OTHER DTC APPEARANCE.

Are other DTCs being output?

Yes

Proceed with the diagnosis corresponding to DTC.


No

A temporary poor contact.