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

DIAGNOSIS: 

• Combination of AT control faults

TROUBLE SYMPTOM: 

• ABS does not operate.

WIRING DIAGRAM: 

Fig 1: Wiring Diagram

1. 10Y1: CHECK SPECIFICATIONS OF THE ABSCM & H/U. 

   Check specifications of the mark to the ABSCM & H/U.

   Fig 2: Identifying Mark On ABSCM & H/U

   
   Fig 3: Specifications On mark On ABSCM & H/U

   

   CHECK: Is an ABSCM & H/U for AT model installed on a MT model? 

   1. YES:  Replace ABSCM & H/U, see ABS CONTROL MODULE AND HYDRAULIC CONTROL UNIT (ABSCM & H/U)  .
   2. NO:  Go to step 10Y2. 
2. 10Y2: CHECK GROUND 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 resistance between ABSCM & H/U connector and chassis ground.

   Connector & terminal 

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

   

   CHECK: Is the resistance more than 1 M ohm ? 

   1. YES:  Go to step 10Y3. 
   2. NO:  Repair harness between TCM and ABSCM & H/U.
3. 10Y3: CHECK TCM. 
   1. Connect all connectors to TCM.
   2. Turn ignition switch to ON.
   3. Measure voltage between TCM connector terminal and chassis ground.

   Connector & terminal 

   1. (B54) No. 19 (+) - Chassis ground (-): 
   Fig 5: Measuring Voltage Between TCM Connector Terminal & Chassis Ground

   

   CHECK: Is the voltage between 6 and 15 V? 

   1. YES:  Go to step  10Y5: CHECK OPEN CIRCUIT OF HARNESS .
   2. NO:  Go to step 10Y4. 
4. 10Y4: CHECK AT. 

   CHECK: Is the AT functioning normally? 

   1. YES:  Replace TCM.
   2. NO:  Replace AT.
5. 10Y5: CHECK OPEN CIRCUIT OF HARNESS. 

   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 6: Measuring Voltage Between ABSCM & H/U Connector & Chassis Ground

   

   CHECK: Is the voltage between 5.5 and 15 V? 

   1. YES:  Go to step 10Y6. 
   2. NO:  Repair harness/connector between TCM and ABSCM & H/U.
6. 10Y6: CHECK POOR CONTACT IN CONNECTORS. 

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

   1. YES:  Repair connector.
   2. NO:  Go to step 10Y7. 
7. 10Y7:  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 10Y8. 
8. 10Y8: 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.