SAAB WIS ONLINE

DTC 52 OPEN CIRCUIT IN MOTOR RELAY CIRCUIT

DTC 52 OPEN CIRCUIT IN MOTOR RELAY CIRCUIT

DIAGNOSIS:


• Faulty motor

• Faulty motor relay

• Faulty harness connector


TROUBLE SYMPTOM:


• ABS does not operate.

• EBD does not operate.


WIRING DIAGRAM:


CHECK INPUT VOLTAGE OF ABSCM&H/U.

Turn the ignition switch to OFF.

Disconnect the connector from ABSCM& H/U.

Turn the ignition switch to ON.

Measure the voltage between ABSCM&H/U connector and chassis ground.

Connector & terminal

(B301) No. 13 (+) — Chassis ground (−):

Is the voltage 10 — 15 V?

Yes


No

Repair the harness/connector between battery and ABSCM&H/U and check fuse SBF8.


CHECK GROUND BOLTS.

Turn the ignition switch to OFF.

Are the ground bolts tightened 13 Nm (1.3 kgf-m, 9.6 ft-lb)?

Yes


No

Tighten the ground bolts securely.


CHECK GROUND CIRCUIT OF MOTOR.

Turn the ignition switch to OFF.

Measure the resistance between ABSCM&H/U connector and chassis ground.

Connector & terminal

(B301) No. 12 — Chassis ground:

Is the resistance less than 0.5 Ω?

Yes


No

Repair the ABSCM&H/U ground harness.


CHECK MOTOR OPERATION.

Operate the sequence control.

Note

Use the diagnosis connector to operate sequence control.


Can motor revolution noise (buzz) be heard when carrying out the check sequence?

Yes


No

Replace the ABSCM&H/U.


CHECK POOR CONTACT IN CONNECTORS.

Turn the ignition switch to OFF.

Is there poor contact in connector between generator, battery and ABSCM&H/U?

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.