## PGM-FI System

#### MIL Circuit Troubleshooting

11-77

1. Connect a scan tool/Honda PGM Tester (see page 11-3)

1. Turn the ignition switch ON (II) and read the scan tool/Honda PGM Tester.

   Does the scan tool/Honda PGM Tester communicate with the ECM?

YES - Go to step 3.

NO - Go to the troubleshooting ''DLC Circuit Troubleshooting'' (see page 11-88)

1. Check the scan tool/Honda PGM Tester for DTCs.

   Are any DTCs indicated?

YES - Go to the DTC Troubleshooting Index.

NO - Go to step 4.

1. Turn the ignition switch OFF.

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 comes on and stays on, go to step 75. But if the MIL sometimes works normally, first check for the following problems.

- An intermittent short in the wire between the ECM (E29) and the Service check Connector.
- 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 the following problems.

- A loose No. 10 METER (7.5A) fuse in the under-dash fuse/relay box.
- A loose No. 20 IG (50A) fuse in the under-hood fuse/relay box.
- A loose No. 6 ECU (ECM) (15A) fuse in the under-hood fuse/relay box.
- A loose No. 17 FUEL PUMP (15A) fuse in the under-dash fuse/relay box.
- A poor connection at ECM terminal E31.
- An intermittent open in the GRN/ORN wire between the ECM (E31) and the gauge assembly.
- An intermittent short in the wire between the ECM (A21) and the manifold absolute pressure (MAP) sensor.
- An intermittent short in the wire between the ECM (A20) and the throttle position (TP) sensor.

1. Turn the ignition switch OFF.

1. Press the inertia switch button.

1. Turn the ignition switch ON (II).

   Does the MIL come on for 2 seconds after the ignition switch is turned ON (II)?

YES - Intermittent failure system is OK at this time.

NO - Go to step 9.

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