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Honda Fit/Jazz - How to Troubleshoot Fuel and Emissions Systems (5MT)

How to Troubleshoot Fuel and Emissions Systems

Intermittent Failures


The term ‘‘intermittent failure'' means a system may have had a failure, but it checks OK now. If the Malfunction Indicator Lamp (MIL) on the dash does not come on, check for poor connections or loose wires at all connectors related to the circuit that you are troubleshooting.

Opens and Shorts


‘‘Open'' and ‘‘Short'' are common electrical terms. An open is a break in a wire or at a connection. A short is an accidental connection of a wire to ground or to another wire. In simple electronics, this usually means something won't work at all. In complex electronics (like ECM's/PCM's) this can sometimes mean something works, but not the way it's supposed to.

How to Use the Honda PGM Tester or a Scan Tool


If the MIL has come on


1.Start the engine and check the MIL.


Do not puncture the insulation on a wire.Punctures can cause poor or intermittent electrical connections.

How to Substitute the ECM/PCM


1.Remove the ECM/PCM from the vehicle.

2.Install a known-good ECM/PCM in the vehicle.

3.Rewrite the immobilizer code with the ECM/PCM replacement procedure on the Honda PGM Tester. It allows you to start the engine.

4.After completing your tests, reinstall the original ECM/PCM and rewrite the immobilizer code with the ECM/PCM replacement procedure on the Honda PGM Tester again.

Honda Fit/Jazz 02-05 Workshop Manual    Back to all Manuals