Trouble Code 44 Abs-At Control (Controlled) - Abs-At Control (Controlled)

DIAGNOSIS: 

• Combination of AT control faults

TROUBLE SYMPTOM: 

• ABS does not operate.

WIRING DIAGRAM: 

Fig 1: Wiring Diagram

1. 10Z1: CHECK BATTERY SHORT OF HARNESS. 
   1. Turn ignition switch to OFF.
   2. Disconnect the two connectors from TCM.
   3. Disconnect connector from ABSCM & H/U.
   4. Measure voltage between ABSCM & H/U connector and chasis ground.

   Connector & terminal 

   1. (F49) No. 3 (+) - Chassis ground (-): 
   Fig 2: Measuring Voltage Between ABSCM & H/U Connector & Chasis Ground

   

   CHECK: Is the voltage less than 1 V? 

   1. YES:  Go to step 10Z2. 
   2. NO:  Repair harness between TCM and ABSCM & H/U.
2. 10Z2: CHECK BATTERY SHORT OF HARNESS. 
   1. Turn ignition switch to ON.
   2. Measure voltage between ABSCM & H/U connector and chassis ground.

   Connector & terminal 

   1. (F49) No. 3 (+) - Chassis ground (-): 
   Fig 3: Measuring Voltage Between ABSCM & H/U Connector & Chassis Ground

   

   CHECK: Is the voltage less than 1 V? 

   1. YES:  Go to step 10Z3. 
   2. NO:  Repair harness between TCM and ABSCM & H/U.
3. 10Z3: CHECK OPEN CIRCUIT OF HARNESS. 
   1. Turn ignition switch to OFF.
   2. Connect all connectors to TCM.
   3. Turn ignition switch to ON.
   4. Measure voltage between ABSCM & H/U connector and chassis ground.

   Connector & terminal 

   1. (F49) No. 3 (+) - Chassis ground (-): 
   2. (F49) No. 31 (+) - Chassis ground (-): 
   Fig 4: Measuring Voltage Between ABSCM & H/U Connector & Chassis Ground

   

   CHECK: Is the voltage between 5.5 and 15 V? 

   1. YES:  Go to step 10Z4. 
   2. NO:  Repair harness/connector between TCM and ABSCM & H/U.
4. 10Z4: CHECK POOR CONTACT IN CONNECTORS. 

   Turn ignition switch to OFF.

   CHECK: Is there poor contact in connectors between TCM and ABSCM & H/U? 

   1. YES:  Repair connector.
   2. NO:  Go to step 10Z5. 
5. 10Z5: 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 10Z6. 
6. 10Z6: 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.