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Honda Fit/Jazz - How to Troubleshoot Fuel and Emissions Systems (L15A 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.

ECM/PCM Updating and Substitution for Testing


Special Tools Required
Honda Interface Module((HIM) EQS05A35570)



Use this procedure when you have to substitute a known-good ECM/PCM in a troubleshooting procedure. Update the ECM/PCM only if the ECM/PCM does not already have the latest software loaded.

NOTE: Do not turn the ignition switch OFF while updating the ECM/PCM. If you turn the ignition switch OFF, the ECM/PCM can be damaged.

How to Update the ECM/PCM


NOTE:

1.Turn the ignition switch ON (II). Do not start the engine.

2.Connect the Honda Interface Module (HIM) to the data link connector (DLC) (A) located under the driver's side of dashboard.

3.Do the ECM/PCM update procedure as described on the HIM label and in the ECM/PCM update system. If the software in the ECM/PCM is the latest, replace the ECM/PCM.

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 in 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 in the Honda PGM Tester again.

Do the idle learn procedure.

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