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DTC 28: TCS Relay

  1. Check the TCS (10A) fuse in the passenger's under dash fuse/relay box, and reinstall the fuse if it is OK.

    Is the fuse OK? 

    1. YES  - Go to step 2.
    2. NO  - Replace the fuse, and recheck.
  2. Turn the ignition switch ON (II).

    Does the fuse blow? 

    1. YES  - Repair short to body ground in the wire between the TCS relay and modulator unit.
    2. NO  - Go to step 3.
  3. Check the TCS relay in the under-hood multi-fuse/relay box (see RELAYS article ). The wire colors of the TCS relay connector are BLU/BLK, RED/BLU, BRN/BLK, and GRN/YEL.

    Is the relay OK? 

    1. YES  - Do not reinstall the TCS relay, and go to step 4.
    2. NO  - Replace the TCS relay.
  4. Measure the voltage between the TCS relay connector terminal No. 1 and body ground.
    Fig 1: Measuring Voltage Between TCS Relay Connector Terminal No. 1 & Body Ground
    G01519812Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 5.
    2. NO  - Repair open in the wire between the under-hood fuse/relay box and the TCS relay.
  5. Connect the TCS relay, connector terminal No. 1 to No. 2 with a jumper wire.
    Fig 2: Connecting TCS Relay, Connector Terminal No. 1 To No. 2 With A Jumper Wire
    G01519813Courtesy of AMERICAN HONDA MOTOR CO., INC.
  6. Disconnect the modulator unit connector.
  7. Measure the voltage between terminal No. 17 and body ground.
    Fig 3: Measuring Voltage Between Terminal No. 17 & Body Ground
    G01519814Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 8.
    2. NO  - Repair open in the wire between the TCS relay and the modulator unit.
  8. Remove the jumper wire from the TCS relay connector.
  9. Measure the voltage between the modulator unit connector terminal No. 17 and body ground.
    Fig 4: Measuring Voltage Between Modulator Unit Connector Terminal No. 17 & Body Ground
    G01519815Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Repair short to power in the wire between the TCS relay and the modulator unit.
    2. NO  - Go to step 10.
  10. Disconnect the ABS/TCS control unit connector B (16P).
  11. Turn the ignition switch ON (II).
  12. Measure the voltage between terminal No. 13 and body ground.
    Fig 5: Measuring Voltage Between Terminal No. 13 & Body Ground
    G01519816Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Repair short to power in the wire between the ABS/TCS control unit and the TCS relay.
    2. NO  - Go to step 13.
  13. Check for continuity between the ABS/TCS control unit connector B (16P) terminal No. 13 and body ground.
    Fig 6: Checking Continuity Between ABS/TCS Control Unit Connector B (16P) Terminal No. 13 & Body Ground
    G01519817Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair short to body ground in the wire between the ABS/TCS control unit and the TCS relay.
    2. NO  - Go to step 14.
  14. Turn the ignition switch OFF.
  15. Remove the ABS fail-safe relay. The wire colors of the ABS fail-safe relay connector are WHT/GRN, BRN/BLK, BLK, and YEL/GRN.
  16. Connect the ABS fail-safe relay connector terminal No. 1 and No. 2 with a jumper wire.
    Fig 7: Connecting ABS Fail-Safe Relay Connector Terminal No. 1 & No. 2 With A Jumper Wire
    G01519818Courtesy of AMERICAN HONDA MOTOR CO., INC.
  17. Measure the voltage between the TCS relay connector terminal No. 3 and body ground.
    Fig 8: Measuring Voltage Between TCS Relay Connector Terminal No. 3 & Body Ground
    G01519819Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 18.
    2. NO  - Repair open in the wire between the ABS fail-safe relay and the TCS relay.
  18. Connect the TCS relay connector No. 3 and No. 4 with a jumper wire.
    NOTE: Make sure the ABS/TCS control unit connector B (16P) is disconnected.
    Fig 9: Connecting TCS Relay Connector No. 3 & No. 4 With A Jumper Wire
    G01519820Courtesy of AMERICAN HONDA MOTOR CO., INC.
  19. Measure the voltage between the ABS/TCS control unit connector B (16P) terminal No. 13 and body ground.
    Fig 10: Measuring Voltage Between ABS/TCS Control Unit Connector B (16P) Terminal No. 13 & Body Ground
    G01519821Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - If the problem recurs, replace the ABS/TCS control unit.
    2. NO  - Repair open in the wire between the TCS relay and the ABS/TCS control unit.
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