Code 52: Abnormal Motor And/Or Motor Relay

DIAGNOSIS: 

• Faulty motor
• Faulty motor relay
• Faulty harness connector

TROUBLE SYMPTOM: 

• ABS does not operate.

WIRING DIAGRAM: 

Fig 1: Wiring Diagram

1. 8W1: 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 8W2. 
   2. NO:  Repair harness/connector between battery and ABSCM & H/U and check fuse SBF-holder.
2. 8W2: CHECK GROUND CIRCUIT OF MOTOR. 
   1. Turn ignition switch of 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 8W3. 
   2. NO:  Repair ABSCM & H/U ground harness.
3. 8W3: CHECK INPUT VOLTAGE OF ABSCM & H/U. 
   1. Run the engine at idle.
   2. Measure voltage between ABSCM & H/U connector and chassis ground.

   Connector & terminal 

   1. (F49) No. 1 (+) - Chassis ground (-): 
   Fig 4: Measuring Voltage Between ABSCM & H/U Connector & Chassis Ground

   

   CHECK: Is the voltage between 10 and 15 V? 

   1. YES:  Go to step 8W4. 
   2. NO:  Repair harness connector between battery, ignition switch and ABSCM & H/U.
4. 8W4: CHECK GROUND CIRCUIT OF ABSCM & H/U. 
   1. Turn ignition switch to OFF.
   2. Measure resistance between ABSCM & H/U connector and chassis ground.

   Connector & terminal 

   1. (F49) No. 23 - Chassis ground: 
   Fig 5: Measuring Resistance Between ABSCM & H/U Connector & Chassis Ground

   

   CHECK: Is the resistance less than 0.5 ohm? 

   1. YES:  Go to step 8W5. 
   2. NO:  Repair ABSCM & H/U ground harness.
5. 8W5: 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 sequence control? 

   1. YES:  Go to step 8W6. 
   2. NO:  Replace ABSCM & H/U, see ABS CONTROL MODULE AND HYDRAULIC CONTROL UNIT (ABSCM & H/U)  .
6. 8W6: CHECK POOR CONTACT IN CONNECTORS. 

   Turn ignition switch to OFF.

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

   1. YES:  Repair connector.
   2. NO:  Go to step 8W7. 
7. 8W7: 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 8W8. 
8. 8W8: 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.