Trouble Code 52 Open Circuit In Motor Relay Circuit - Open Circuit In Motor Relay Circuit

DIAGNOSIS:

Faulty motor
Faulty motor relay
Faulty harness connector

TROUBLE SYMPTOM:

ABS does not operate.

WIRING DIAGRAM:

Fig 1: Wiring Diagram

10AC1: CHECK INPUT VOLTAGE OF ABSCM & H/U
1. Turn ignition switch to OFF.
2. Disconnect connector from ABSCM & H/U.
3. Turn ignition switch to ON.
4. Measure voltage between ABSCM & H/U connector and chassis ground.
Connector & terminal
1. (F49) No. 25 (+) - Chassis ground (-):
Fig 2: Measuring Voltage Between ABSCM & H/U Connector & Chassis Ground

CHECK: Is the voltage between 10 and 15 V?
1. YES: Go to step 10AC2.
2. NO: Repair harness/connector between battery and ABSCM & H/U and check fuse SBF-6.
10AC2: CHECK GROUND CIRCUIT OF MOTOR.
1. Turn ignition switch to OFF.
2. Measure resistance between ABSCM & H/U connector and chassis ground.
Connector & terminal
1. (F49) No. 26 - Chassis ground:
Fig 3: Measuring Resistance Between ABSCM & H/U Connector & Chassis Ground

CHECK: Is the resistance less than 0.5 ohm ?
1. YES: Go to step 10AC3.
2. NO: Repair ABSCM & H/U ground harness.
10AC3: CHECK MOTOR OPERATION.
Operate the sequence control, see ABS SEQUENCE CONTROL .

NOTE: Use the diagnosis connector to operate the sequence control.

CHECK: Can motor revolution noise (buzz) be heard when carrying out the check sequence?
1. YES: Go to step 10AC4.
2. NO: Replace ABSCM & H/U, see ABS CONTROL MODULE AND HYDRAULIC CONTROL UNIT (ABSCM & H/U) .
10AC4: CHECK POOR CONTACT IN CONNECTORS.
Turn ignition switch to OFF.

CHECK: Is there poor contact in connector between hydraulic unit, relay box and ABSCM & H/U?
1. YES: Repair connector.
2. NO: Go to step 10AC5.
10AC5: CHECK ABSCM & H/U.
1. Connect all connectors.
2. Erase the memory.
3. Perform inspection mode.
4. Read out the trouble code.
CHECK: Is the same trouble code as in the current diagnosis still being output?
1. YES: Replace ABSCM & H/U, see ABS CONTROL MODULE AND HYDRAULIC CONTROL UNIT (ABSCM & H/U) .
2. NO: Go to step 10AC6.
10AC6: CHECK ANY OTHER TROUBLE CODES APPEARANCE.
CHECK: Are other trouble codes being output?
1. YES: Proceed with the diagnosis corresponding to the trouble code.
2. NO: A temporary poor contact.