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Home >> Acura >> 2009 >> TSX Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Electronic Throttle Control System (4-CYL) >> DTC Troubleshooting >> DTC P1659: ETCS Control Relay OFF Malfunction

DTC P1659: ETCS Control Relay OFF Malfunction

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION )
  1. Turn the ignition switch to ON (II)
  2. Clear the DTC with the HDS
  3. Check for Temporary DTCs or DTCs with the HDS

    Is DTC P1659 indicated? 

    YES  -Go to step 4

    NO  -Intermittent failure, the system is OK at this time Check for poor connections or loose terminals at the ETCS control relay and the ECM/PCM

  4. Turn the ignition switch to LOCK (0)
  5. Check the No 18 DBW (THROTTLE ACTUATOR CONTROL) (15 A) fuse in the under-hood fuse/relay box

    Is the fuse OK? 

    YES  -Go to step 6

    NO  -Go to step  17

  6. Remove the ETCS control relay (A) from the under-hood fuse/relay box
    Fig 1: Identifying ETCS Control Relay
    G05992391Courtesy of AMERICAN HONDA MOTOR CO., INC.
  7. Test the ETCS control relay (see POWER RELAY TEST )

    Is the ETCS control relay OK? 

    YES  -Go to step 8

    NO  -Replace the ETCS control relay, then go to step  23

  8. Turn the ignition switch to ON (II)
  9. Measure the voltage between ETCS control relay 4P connector terminal No 4 and body ground
    Fig 2: Measuring Voltage Between ETCS Control Relay 4P Connector Terminal No 4 And Body Ground
    G05992392Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 10

    NO  -Check the under-hood fuse/relay box, and replace it if needed (see REMOVAL AND INSTALLATION ), then go to step  22

  10. Measure the voltage between ETCS control relay 4P connector terminal No 1 and body ground
    Fig 3: Measuring Voltage Between ETCS Control Relay 4P Connector Terminal No 1 And Body Ground
    G05992393Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 11

    NO  -Check the under-hood fuse/relay box, and replace it if needed (see REMOVAL AND INSTALLATION ), then go to step  22

  11. Turn the ignition switch to LOCK (0)
  12. Jump the SCS line with the HDS
  13. Disconnect ECM/PCM connector C (49P)
  14. Check for continuity between ETCS control relay 4P connector terminal No 2 and ECM/PCM connector terminal C1
    Fig 4: Checking Continuity Between ETCS Control Relay 4P Connector Terminal No 2 And ECM/PCM Connector Terminal C1
    G05992394Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 15

    NO  -Repair open in the wire between the ECM/PCM (CD and the ETCS control relay, then go to step  23

  15. Disconnect ECM/PCM connector A (49P)
  16. Check for continuity between ETCS control relay 4P connector terminal No 3 and ECM/PCM connector terminal A21
    Fig 5: Checking Continuity Between ETCS Control Relay 4P Connector Terminal No 3 And ECM/PCM Connector Terminal A21
    G05992395Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  28

    NO  -Repair open in the wire between the ECM/PCM (A21) and the ETCS control relay, then go to step  23

  17. Remove the ETCS control relay (A) from the under-hood fuse/relay box
    Fig 6: Identifying ETCS Control Relay
    G05992396Courtesy of AMERICAN HONDA MOTOR CO., INC.
  18. Jump the SCS line with the HDS
  19. Disconnect ECM/PCM connector C (49P)
  20. Check for continuity between ECM/PCM connector terminal C1 and body ground
    Fig 7: Checking Continuity Between ECM/PCM Connector Terminal C1 And Body Ground
    G05992397Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair short in the wire between the ECM/PCM (C1) and the ETCS control relay, then go to step  23

    NO  -Go to step 21

  21. Check for continuity between ETCS control relay 4P connector terminal No 1 and body ground
    Fig 8: Checking Continuity Between ETCS Control Relay 4P Connector Terminal No 1 And Body Ground
    G05992398Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Check the under-hood fuse/relay box, and replace it if needed (see REMOVAL AND INSTALLATION ), then go to step  23

    NO  -Go to step  28

  22. Turn the ignition switch to LOCK (0)
  23. Reconnect all connectors
  24. Turn the ignition switch to ON (II)
  25. Reset the ECM/PCM with the HDS
  26. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE )
  27. Check for Temporary DTCs or DTCs with the HDS

    Is DTC P1659 indicated? 

    YES  -Check for poor connections or loose terminals at the ETCS control relay and the ECM/PCM, then go to step  1

    NO  -Troubleshooting is complete If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting

  28. Reconnect all connectors
  29. Update the ECM/PCM if it does not have the latest software (see ECM/PCM UPDATE ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM )
  30. Check for Temporary DTCs or DTCs with the HDS

    Is DTC P1659 indicated? 

    YES  -Check for poor connections or loose terminals at the ETCS control relay and the ECM/PCM If the ECM/PCM was updated, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then recheck If the ECM/PCM was substituted, go to step  1

    NO  -If the ECM/PCM was updated, troubleshooting is complete If the ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ) If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting

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