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Home >> Honda >> 2006 >> Ridgeline RT >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Ignition Coil Relay Circuit Troubleshooting
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Ignition Coil Relay Circuit Troubleshooting

  1. Check the No. 2 (15 A) fuse in the underdash fuse/relay box.

    Is the fuse OK? 

    1. YES  - Go to step 2.
    2. NO  - Replace the fuse.
  2. Remove the ignition coil relay from the underdash fuse/relay box, and test it (see POWER RELAY TEST ).

    Is the relay OK? 

    1. YES  - Go to step 3.
    2. 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
    G03688092Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 4.
    2. NO  - Replace the underdash fuse/relay box.
  4. Check for continuity between ignition coil relay 4P socket terminal No. 2 and the No. 1 ignition coil 3P connector terminal No. 3.
    Fig 2: Checking For Continuity Between Ignition Coil Relay 4P Socket Terminal No. 2
    G03688093Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Go to step 5.
    2. NO  - Repair an open in the wire between ignition coil relay 4P socket terminal No. 2 and No. 1 ignition coil 3P connector terminal No. 3.
  5. Connect the Honda Diagnostic System (HDS) to the data link connector (DLC) (see step 2 on GENERAL TROUBLESHOOTING INFORMATION ).
  6. Turn the ignition switch OFF.
  7. Jump the SCS line with the HDS.
    NOTE: This step must be done to protect the powertrain control module (PCM) from damage.
  8. Disconnect PCM connector A (44P).
  9. Check for continuity between ignition coil relay 4P socket terminal No. 3 and body ground.
    Fig 3: Checking For Continuity Between Ignition Coil Relay 4P Socket Terminal No. 3 And Body Ground
    G03688094Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair a short in the wire between ignition coil relay 4P socket terminal No. 3 and the PCM (A6).
    2. NO  - Go to step 10.
  10. Check for continuity between ignition coil relay 4P socket terminal No. 3 and PCM connector terminal A6.
    Fig 4: Checking For Continuity Between Ignition Coil Relay 4P Socket Terminal No. 3 And PCM Connector Terminal A6
    G03688095Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - The system is OK at this time. Check for loose or poor connections at the ignition coil relay and the PCM (A6).
    2. NO  - Repair an open in the wire between ignition coil relay 4P socket terminal No. 3 and the PCM (A6).
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