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Ignition Coil Relay Circuit Troubleshooting

WARNING: This page is about a different car, the 2006 Acura MDX, 2005 Acura MDX, 2004 Acura MDX, and 2003 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check the No. 46 (15 A) fuse in the under-hood fuse/relay box and No. 8 (15 A) fuse in the under-hood subfuse box.

    Is the fuse OK? 

    1. YES  - Go to step 2.
    2. NO  - Replace the fuse.
  2. Remove the ignition coil relay from the relay block, 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.
    Fig 1: Measuring Voltage Between Ignition Coil Relay 4P Socket Terminal No. 1 And Body Ground
    G03639164Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 4.
    2. NO  - Repair an open in the wire between ignition coil relay 4P socket terminal No. 1 and the under-hood subfuse box.
  4. Measure the voltage between ignition coil relay 4P socket terminal No. 4 and body ground.
    Fig 2: Measuring Voltage Between Ignition Coil Relay 4P Socket Terminal No. 4 And Body Ground
    G03639165Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 5.
    2. NO  - Repair an open in the wire between ignition coil relay 4P socket terminal No. 4 and the under-hood fuse/relay box.
  5. Check for continuity between ignition coil relay 4P socket terminal No. 2 and No. 1 ignition coil 3P connector terminal No. 3.
    Fig 3: Checking Continuity Between Ignition Coil Relay 4P Socket Terminal No. 2 And 1 Ignition Coil 3P Connector Terminal No. 3
    G03639166Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Go to step 6.
    2. NO  - Repair an open in the wire between ignition coil relay 4P socket terminal No. 2 and ignition coil 3P connector terminal No. 3.
  6. 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
    G03639167Courtesy 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 (B12).
    2. NO  - Go to step 7.
  7. Turn the ignition switch OFF.
  8. Connect the Honda Diagnostic System (HDS) to the data link connector (DLC) (see step 2 on GENERAL TROUBLESHOOTING INFORMATION ). Turn the ignition switch ON (II), and jump the SCS line with the HDS, then turn the ignition switch OFF.
    NOTE: This step must be done to protect the powertrain control module (PCM) from damage.
  9. Disconnect PCM connector B (56P).
  10. Check for continuity between ignition coil relay 4P socket terminal No. 3 and PCM connector terminal B12.
    Fig 5: Checking Continuity Between Ignition Coil Relay 4P Socket Terminal No. 3 And PCM Connector Terminal B12
    G03639168Courtesy 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 (B12).
    2. NO  - Repair an open in the wire between ignition coil relay 4P socket terminal No.3 and the PCM (B12).
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