INSPECTION PROCEDURE 1: Communication With Scan Tool is not Possible. (Communication With TCL Only is not Possible.): Diagnosis

Required Special Tool: 

• MB991223: Harness Set

1. STEP 1. Check the power supply circuit at ABS-ECU connector A-03. 
   1. Disconnect connector A-03 and measure at the harness side.
   2. Start the engine.
   3. Measure the voltage between connector A-03 terminal 4 and ground.
      Fig 1: Measuring Voltage Between Connector A-03 Terminal 4 And Ground

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   Q: Is battery positive voltage (approximately 12 volts) present? 

   1. YES:  Go to  Step 3 .
   2. NO:  Go to Step 2.
2. STEP 2. Check the harness wire between ignition switch (IG2) connector C-58 terminal 4 and ABS-ECU connector A-03 terminal 4. 
   NOTE: After inspecting intermediate connectors C-12, C-84, and C-87, inspect the wire. If intermediate connector C-12, C-84, or C-87 is damaged, repair or replace it. Refer to HARNESS CONNECTOR INSPECTION . If the connector has been repaired or replaced, go to Step 3.
   Fig 2: Identifying Ignition Switch Connector C-58

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   Fig 3: Identifying ABS-ECU Connector A-03

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   Fig 4: Identifying Intermediate Connectors C-12

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   Fig 5: Identifying Junction Block Connector C-84, C-87

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   Q: Is any harness wire between ignition switch (IG2) connector C-58 terminal 4 and ABS-ECU connector A-03 terminal 4 damaged? 

   1. YES:  Repair damaged wire(s) and go to  Step 5 .
   2. NO:  Go to  Step 5 .
3. STEP 3. Check the harness wire between ABS-ECU connector A-03 terminal 7 and data link connector C-23 terminal 7, or ABS-ECU connector A-03 terminal 14 and data link connector C-23 terminal 1. 
   NOTE: After inspecting intermediate connectors C-12 and C-57, inspect the wires. If intermediate connector C-12 or C-57 is damaged, repair or replace it. Refer to HARNESS CONNECTOR INSPECTION . If the connector has been repaired or replaced, go to Step 4.
   Fig 6: Identifying ABS-ECU Connector A-03

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   Fig 7: Identifying Data Link Connector C-23

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   Fig 8: Identifying Intermediate Connector C-12

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   Fig 9: Identifying Intermediate Connector C-57

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   Q: Is any harness wire between ABS-ECU connector A-03 terminal 7 and data link connector C-23 terminal 7, or ABS-ECU connector A-03 terminal 14 and data link connector C-23 terminal 1 damaged? 

   1. YES:  Repair damaged wire(s) and go to  Step 5 .
   2. NO:  Go to Step 4.
4. STEP 4. Check the harness wires between ABS-ECU connector A-03 terminal 8 and ground, or ABS-ECU connector A-03 terminal 24 and ground. 

   Q: Are any harness wires between ABS-ECU connector A-03 terminal 8 and ground, or ABS-ECU connector A-03 terminal 24 and ground damaged? 

   1. YES:  Repair damaged wire(s) and then go to Step 5.
   2. NO:  Replace the hydraulic unit (integrated with ABS-ECU) and then go to Step 5.
      Fig 10: Identifying ABS-ECU Connector A-03

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      Fig 11: Identifying Wiper Motor Ground Point

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5. STEP 5. Retest the system. 

   Q: Does the scan tool communicate with the ABS system? 

   1. YES:  The procedure is complete.
   2. NO:  Return to  Step 1 .