INSPECTION PROCEDURE 1: Communication between Scan Tool and the ABS-ECU is not possible.: Diagnosis

Required Special Tool: 

• MB991223: Harness Set

1. STEP 1. Check the power supply circuit at ABS-ECU connector B-118.
   1. Disconnect ABS-ECU connector B-118 and measure at the harness side.
   2. Start the engine.
   3. Measure the voltage between terminal 20 and ground.

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

   • YES:  Go to  Step 3 .
   • NO:  Go to Step 2.
   Fig 1: Disconnecting ABS-ECU Connector B-118

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2. STEP 2. Check the harness wire between the ignition switch (IG2) connector C-208 terminal 4 and ABS-ECU connector B-118 terminal 20.
   Fig 2: Identifying Ignition Switch (IG2) Connector C-208

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   Fig 3: Identifying ABS-ECU Connector B-118

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   NOTE: After inspecting the intermediate connector C-122, C-210, and C-211, inspect the wire. If the intermediate connector C-122, C-210 or C-211 is damaged, repair or replace it. Refer to HARNESS CONNECTOR INSPECTION . If the connector has been repaired or replaced, go to Step 3.

   Q: Is the harness wire between the ignition switch (IG2) connector C-208 terminal 4 and ABS-ECU connector B-118 terminal 20 damaged? 

   • YES:  Repair it and go to  Step 5 .
   • NO:  Go to Step 3.
   Fig 4: Identifying Intermediate Connector C-122

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   Fig 5: Identifying Intermediate Connector C-210 And C-211

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3. STEP 3. Check the harness wires between ABS-ECU connector B-118 terminal 13 and data link connector C-14 terminal 7 or ABS-ECU connector B-118 terminal 4 and data link connector C-14 terminal 1.
   Fig 6: Identifying ABS-ECU Connector B-118

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   Fig 7: Identifying Intermediate Connectors C-105, C-122 And C-124 And Data Link Connector C-14

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   NOTE: After inspecting intermediate connectors C-101, C-105, C-122 and C-124, inspect the wires. If the intermediate connector C-101, C-105, C-122 or C-124 is damaged, repair or replace it. Refer to HARNESS CONNECTOR INSPECTION . If the connector has been repaired or replaced, go to  Step 5 .

   Q: Is any of the harness wires between ABS-ECU connector B-118 terminal 13 and data link connector C-14 terminal 7 or ABS-ECU connector B-118 terminal 4 and data link connector C-14 terminal 1 damaged? 

   • YES:  Repair it and go to  Step 5 .
   • NO:  Go to Step 4.
   Fig 8: Identifying Intermediate Connectors C-101

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4. STEP 4. Check the harness wires between ABS-ECU connector B-118 terminal 2 and ground or ABS-ECU connector B-118 terminal 18 and ground.

   Q: Is any of the harness wires between ABS-ECU connector B-118 terminal 2 and ground or ABS-ECU connector B-118 terminal 18 and ground damaged? 

   • YES:  Repair it and then go to Step 5.
   • NO:  Retest the system. If the malfunction persists, replace the hydraulic unit (integrated with ABS-ECU). Then go to Step 5. If the malfunction is not reproduced, then a transient malfunction is suspected. Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS .
   Fig 9: Identifying ABS-ECU Connector B-118

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   Fig 10: Identifying Indicator Panel Assembly

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5. STEP 5. Retest the system.

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

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