Civic Si L4-2.0L (2004)
Malfunction Indicator Lamp: Testing and Inspection
MIL Circuit Troubleshooting
1. Connect the HDS or a scan tool.
2. Turn the ignition switch ON (II) and read the HDS or a scan tool.
Does the HDS or a scan tool communicate with the ECM?
YES - Go to step 3.
NO - Go to troubleshooting "DLC Circuit Troubleshooting".
3. Check the HDS or a scan tool for DTCs.
Are any DTCs indicated?
YES - Go to the DTC Troubleshooting Index. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Diagnostic
Trouble Code Descriptions
NO - Go to step 4.
4. Turn the ignition switch OFF.
5. Turn the ignition switch ON (II) and watch the malfunction indicator lamp (MIL).
Does the MIL come on and stay on for more than 20 seconds after turning the ignition switch ON (II)?
YES - If the MIL always comes on and stays on, go to step 76. But if the MIL sometimes works normally, first check for these problems.
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An intermittent short in the wire between the ECM (E29) and the data link connector (DLC).
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An intermittent short in the wire between the ECM (E31) and the gauge assembly.
NO - If the MIL is always off, go to step 6. But if the MIL sometimes works normally, first check for these problems.
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A loose No.10 METER (7.5A) fuse in the under-dash fuse/relay box.
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A loose No.20 IG (40A) (Canada: 50A) fuse in the under-hood fuse/relay box.
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A loose No.6 ECU (ECM) (15A) fuse in the under-hood fuse/relay box.
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A loose No.17 FUEL PUMP (15A) fuse in the under-dash fuse/relay box.
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A poor connection at ECM terminal E31.
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An intermittent open in the GRN/ORN wire between the ECM (E31) and the gauge assembly.
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An intermittent short in the wire between the ECM (A21) and the manifold absolute pressure (MAP) sensor.
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An intermittent short in the wire between the ECM (A20) and the throttle position (TP) sensor.
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An intermittent short in the wire between the ECM (E5) and the fuel tank pressure (FTP) sensor.
6. Turn the ignition switch OFF.
7. Turn the ignition switch ON (II).
Is the low oil pressure light on?
YES - Go to step 10.
NO - Go to step 8.
8. Inspect the No.10 METER (7.5A) fuse in the under-dash fuse/relay box.
Is the fuse OK?
YES - Go to step 9.
NO - Repair short in the wire between No.10 METER (7.5A) fuse and the gauge assembly. Also replace the No.10 METER (7.5A) fuse.
9. Inspect the No.20 IG1 (40A) (Canada: 50A) fuse in the under-hood fuse/relay box.
Is the fuse OK?
YES - Repair open in the wire between the No.20 IG (40A) (Canada: 50A) fuse and the gauge assembly. If the wire is OK, test the ignition switch.
NO - Repair short in the wire between No.20 IG (40A) (Canada: 50A) fuse and the under-dash fuse/relay box. Also replace the No.20 IG (40A)