INSPECTION PROCEDURE 2: Communication between the Scan Tool and the ABS-ECU is not possible.: Diagnosis

1. Disconnect ABS-ECU connector B-118 and measure at the harness side.
2. Start the engine.
3. Measure the voltage between terminal 10 and ground. It should measure battery voltage (approximately 12 volts).

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

YES:  Go to  Step 4.

NO:  Go to Step 2.

Fig 1: Measuring Voltage Between Terminal 10 And Ground

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• ABS-ECU connector B-118
  Fig 2: Identifying Connector B-118 Terminal

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• Junction block connectors C-210, C-211
  Fig 3: Identifying Junction Block Connectors C-210, C-211

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• Intermediate connector C-124

Check the connectors for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are the connectors and terminals in good condition? 

YES:  Go to Step 3.

NO:  Repair it and then go to  Step 9.

Fig 4: Identifying Intermediate Connector C-124 Terminal

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The wire between junction block connector C-211 (terminal 2) and ABS-ECU connector B-118 (terminal 10)

Q: Is the harness wire damaged? 

YES:  Repair or replace it and then go to  Step 9.

NO:  Go to  Step 9.

Fig 5: Identifying Junction Block Connector C-211 Terminal

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Fig 6: Identifying Connector B-118 Terminal

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Measure the resistance between terminal 12 and ground, and terminal 34 and ground. It should measure less than 2 ohms.

Q: Is the resistance 2 ohms or less? 

YES:  Go to  Step 7.

NO:  Go to Step 5.

Fig 7: Measuring Resistance Between Terminal 12, 34 And Ground

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ABS-ECU connector B-118

Check the connector, for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are the connector and terminals in good condition? 

YES:  Go to Step 6.

NO:  Repair it and then go to  Step 9.

Fig 8: Identifying Connector B-118 Terminal

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• The wire between ABS-ECU connector B-118 (terminal 12) and ground (No.14)
• The wire between ABS-ECU connector B-118 (terminal 34) and ground (No.14)

Q: Is any harness wire damaged? 

YES:  Repair or replace it and then go to  Step 9.

NO:  Go to  Step 9.

Fig 9: Identifying Connector B-118 Terminal

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Fig 10: Identifying Grounding Wire No.14

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• Data link connector C-14
  Fig 11: Identifying Data Link Connector C-14 Terminal

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• Joint connectors C-23, C-101, C-105
• Intermediate connector C-124
  Fig 12: Identifying Joint Connectors C-23, C-101, C-105 Terminal

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• ABS-ECU connector B-118

Check the connectors for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are the connectors and terminals in good condition? 

YES:  Go to Step 8.

NO:  Repair it and then go to  Step 9.

Fig 13: Identifying Connector B-118 Terminal

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• The wire between ABS-ECU connector B-118 (terminal 2) and data link connector C-14 (terminal 7)
• The wire between ABS-ECU connector B-118 (terminal 5) and data link connector C-14 (terminal 1)

Q: Is any harness wire damaged? 

YES:  Repair or replace it and then go to Step 9.

NO:  Replace the brake modulator hydraulic unit (integrated with ABS-ECU) (Refer to HYDRAULIC UNIT  ). Then go to Step 9.

Fig 14: Identifying Connector B-118 Terminal

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Fig 15: Identifying Data Link Connector C-14 Terminal

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

YES:  The procedure is complete.

NO:  Return to  Step 1.