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Ignition Coil Relay Circuit Troubleshooting

  1. Check the No. 2 (15 A) fuse in the driver's under-hood fuse/relay box.

    Is the fuse OK? 

    YES  -Reinstall the fuse, then go to step 2.

    NO  -Replace the fuse. If the fuse continues to blow, locate and repair the short in the circuit between the under-hood fuse/relay box and the ignition coils.?

  2. Remove the ignition coil relay from the driver's under-hood fuse/relay box, and test it.

    Is the relay OK? 

    YES  -Go to step 3.

    NO  -Replace the ignition coil relay.?

  3. Measure the voltage between ignition coil relay 4P socket terminal No. 1 and body ground, then terminal No. 4 and body ground.
    Fig 1: Measuring Voltage Between Ignition Coil Relay 4P Socket Terminal No. 1 And Body Ground
    G00486062Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    YES  -Go to step 4.

    NO  -Replace the driver's under-hood fuse/relay box.?

  4. Check for continuity between each ignition coil relay 4P socket terminal No. 2 and ignition coil 3P connector terminal No. 3.
    Fig 2: Checking Continuity Between Each Ignition Coil Relay 4P Socket Terminal No. 2
    G00486063Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 5.

    NO  -Repair open in the wire between ignition coil relay 4P socket terminal No. 2 and ignition coil 3P connector terminal No. 3.?

  5. Check for continuity between each ignition coil 3P connector terminal No. 2 and the body ground.
    Fig 3: Checking Continuity Between Each Ignition Coil 3P Connector Terminal No. 2 And Body Ground.
    G00492052Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 6.

    NO  -Repair open in the wire between ignition coil 3P connector terminal No. 2 and the body ground.?

  6. Connect the Honda Diagnostic System (HDS) to the data link connector (DLC) (see HOW TO USE THE HDS (HONDA DIAGNOSTIC SYSTEM) ).
  7. Turn the ignition switch to ON (II).
  8. Make sure the HDS communicates with the vehicle and the powertrain control module (PCM). If it does not communicate, troubleshoot the DLC circuit.
  9. Jump the SCS line with the HDS, then turn the ignition switch to LOCK (0).
    NOTE: This step must be done to protect the PCM from damage.
  10. Disconnect PCM connector A (49P).
  11. Check for continuity between ignition coil relay 4P socket terminal No. 3 and body ground.
    Fig 4: Checking Continuity Between Ignition Coil Relay 4P Socket Terminal No. 3 And Body Ground.
    G00492053Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair short in the wire between ignition coil relay 4P socket terminal No. 3 and the PCM connector terminal A6.

    NO  -Go to step 12.

  12. Check for continuity between ignition coil relay 4P socket terminal No. 3 and PCM connector terminal A6.
    Fig 5: Checking Continuity Between Ignition Coil Relay 4P Socket Terminal No. 3 And PCM Connector Terminal A6.
    G00492054Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -The system is OK at this time. Check for loose or poor connections at the ignition coil relay and the PCM connector terminal A6.

    NO  -Repair open in the wire between ignition coil relay 4P socket terminal No. 3 and PCM connector terminal A6.

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