S2000 L4-2.2L (2004)
Malfunction Indicator Lamp: Testing and Inspection
MIL Circuit Troubleshooting
1. Turn the ignition switch ON (II), and watch the Malfunction Indicator Lamp (MIL).
Does the MIL come on and stay on?
YES - If the MIL always come on and stays on, go to step 20. 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 (A10) and the data link connector (DLC).
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An intermittent short in the wire between the ECM (A18) and the gauge assembly.
NO - If the MIL is always off, go to step 2. But if the MIL sometimes works normally, first check for these problems.
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A loose No. 5 INSTRUMENT LIGHT BACK UP LIGHT (7.5 A) fuse in the under-dash fuse/relay box.
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A loose ACGS (15 A) fuse in the under-hood fuse/relay box.
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A loose No. 2 FUEL PUMP SRS (15 A) fuse in the under-dash fuse/relay box.
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A poor connection at ECM terminal A18.
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An intermittent open in the GRN/ORN wire between the ECM (A18) and the gauge assembly.
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An intermittent short in the wire between the ECM (C19) and the MAP sensor.
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An intermittent short in the wire between the ECM (C28) and TP sensor, vehicle speed sensor (VSS), air pump electric current sensor, or fuel
tank pressure (FTP) sensor.
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PGM-FI main relay.
2. Turn the ignition switch OFF and then ON (II) again.
Is the low oil pressure light on?
YES - Go to step 3.
NO - Check for these problems.
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A blown No. 5 INSTRUMENT LIGHT BACK UP LIGHT (7.5 A) fuse in the under-dash fuse/relay box.
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A short or open in the wire between No. 5 INSTRUMENT LIGHT BACK UP LIGHT (7.5 A) fuse and the gauge assembly.
3. Try to start the engine.
Does the engine start?
YES - Go to step 4.
NO - Go to step 7.
4. Turn the ignition switch OFF.
5. Connect ECM connector terminal A18 to body ground with a jumper wire.
6. Turn the ignition switch ON (II).
Is the MIL on?
YES - Substitute a known-good ECM and recheck. If the symptom/indication goes away, replace the original ECM.
NO - Check for an open in the wires between the ECM (A18) and the gauge assembly. Also check for a blown MIL bulb.
7. Turn the ignition switch OFF.
8. Inspect the ACGS (15 A) fuse in the main under-hood fuse/relay box.
